Oxygen reduction reaction (ORR) is crucial for Zn-air batteries, while also serves as a core electrochemical process in oxygen depolarized cathodes (ODCs) for chlor-alkali electrolysis. The lack of cost-effective, highly active ORR electrocatalysts with superior kinetics hinders progress in this field. Herein, we report the Fe/Ni dual single-atomic sites anchored by commercial carbon black (Fe/Ni-N/CB) using rigid ligand confined and high-temperature shock (HTS) strategy in less than 0.5 s. Theoretical calculation reveals that single-atomic Fe is the real active site. Single-atomic Fe and Ni species in Fe/Ni-N/CB synergistically accelerate the kinetics of ORR by reducing the energy barrier of the rate-determining step. A large half-wave potential (E-1/2) of 0.907 V is achieved in 0.1 M KOH aqueous solution. The assembled aqueous Zn-air battery (A-ZAB) with Fe/Ni-N/CB cathode presents remarkable charge-discharge cycling stability for over 650 h without voltage gap degradation. The quasi-solid-state Zn-air battery (QSS-ZAB) exhibits excellent reversibility over a 150-h operation at 0.5 mA center dot cm(-2) with negligible energy conversion efficiency recession. Impressively, Fe/Ni-N/CB||RuO2 chlor-alkali flow cell exhibits a low cell voltage of 1.60 V at a large current density of 300 mA center dot cm(-2) at 80 degrees C, and demonstrates exceptional durability with 7% current density decay over 150 h of continuous operation at 100 mA center dot cm(-2). Fe/Ni-N/CB||RuO2 achieves near-ideal caustic current efficiency (similar to 97.2%) at the current density of 300 mA center dot cm(-2). This work provides a rapid and economical synthesis technique for the synthesis of catalysts at the atomic scale while demonstrating significant potential for application in energy-saving chlor-alkali electrolyzer.

To simultaneously address the pressing challenges of sewage sludge (SS) disposal and coffee grounds (CG) valorization, herein, co-hydrothermal carbonization (Co-HTC) of SS and CG was performed at a dry mass ratio of 1:2 over a temperature range of 180–260 °C to evaluate hydrochar properties and synergistic interactions. Results revealed that hydrochar produced from SS alone (SS260) exhibited poor fuel quality with an ash content of 64.04% and a higher heating value (HHV) of merely 8.56 MJ·kg− 1. In contrast, co-hydrochar (SC260) demonstrated substantially enhanced fuel characteristics: ash content reduced to 38.53%, fixed carbon increased to 10.53%, and HHV elevated to 15.11 MJ·kg− 1 (a 76.5% increase relative to SS260), achieving an overall energy recovery efficiency of 64%. Combustion performance was also markedly improved, with SC180 exhibiting a combustibility index (Ci) of 1.06 and a comprehensive combustion index (S) of 6.37, values far exceeding those of raw SS (0.75 and 2.92, respectively). Notably, significant synergistic effects were observed during Co-HTC: SC260 achieved a carbon retention synergy coefficient of 7.92% and a yield synergy coefficient of 3.05%. Additionally, the resulting co-hydrochar possessed a higher specific surface area (31.54 m2·g− 1) and more developed porous structure compared to single-feedstock hydrochar. These findings demonstrate that Co-HTC of SS and CG is an effective strategy to upgrade hydrochar fuel quality, offering a technically viable approach for the clean and sustainable co-valorization of these two problematic organic wastes.

A synergistic ML–DFT framework identifies zero-strain α-MoO 3 for solid ZIBs. We conceptually unveil a “bonding compensation” mechanism: dynamic bond-switching breaks the kinetic-stability paradox, ensuring rapid ion kinetics within a rigid lattice.

ABSTRACT Manganese dioxide (MnO 2 ) is a promising cathode material for aqueous zinc‐ion batteries (AZIBs), but its performance is limited by slow ion transport kinetics and poor structural stability. In this study, the supramolecular sacrificial template strategy is introduced to overcome these challenges. Specifically, the removable P123 surfactant is selected as a dynamic template to regulate the reaction between Mn 2+ and MnO 4 − , controlling the formation pathway and final structure of MnO 2 (denoted as PMO). Experimental analyses and theoretical calculations show that ether oxygen and hydroxyl oxygen in the P123 molecule coordinate with Mn 2+ . This interaction promotes the formation of a 2D nanosheet morphology, enhances the hybridization of Mn 3d and O 2p orbitals, and facilitates the emergence of oxygen defects. The multi‐level structural design optimizes carrier transport dynamics and matrix stability, which results in PMO exhibiting superior cycling stability (203 mAh g −1 after 1000 cycles at 2 A g −1 ) and rate performance (122 mAh g −1 at 10 A g −1 ). Reversible and stable structural evolution during cycling is confirmed through in situ and ex situ characterization methods. This work elucidates the role of surfactants in MnO 2 synthesis and paves the way for the design of high‐performance electrode materials.

Magnesium hydride (MgH2) is a promising solid-state hydrogen-storage material because of its high theoretical hydrogen capacity, but its practical application remains limited by sluggish sorption kinetics and high thermodynamic stability. In this work, a dual-phase Mg/MgH2-Ti3C2Tx composite was prepared by hydrogenation-assisted reactive ball milling using metallic Mg as the starting material. The optimized Mg-5 wt% Ti3C2com-posite exhibits a dehydrogenation onset temperature of 173 degrees C, which is 113 degrees C lower than that of the Ti3C2-free sample, and releases 6.20 wt% H2within 1 min at 300 degrees C. It also shows enhanced hydrogen absorption over 100-300 degrees C. Kinetic analysis indicates that Ti3C2addition reduces the apparent dehydrogenation activation energy from 118.8 to 71.39 kJ Mol-1. Structural characterizations reveal a defect-rich microstructure with uniformly dispersed Ti-containing species and abundant Mg/MgH2heterointerfaces. Comparative experiments further show that etched Ti3C2is more effective than its parent Ti3AlC2MAX phase in promoting hydrogen sorption. XPS and DFT results support the important role of Ti-centered species in the hydrogen sorption process. In addition, the Mg-5 wt% Ti3C2composite retains 90.3% of its dehydrogenation capacity after 30 cycles at 300 degrees C. These results show that hydrogenation-assisted reactive milling is an effective route for constructing active Mg/MgH2-Ti3C2composites with improved hydrogen-storage performance

Electrolyte additives are an effective approach to suppress dendrite growth and parasitic reactions on Zn anodes. However, additive-enabled solvation regulation is often limited by poor reversibility during long-term cycling. Here, we propose a screening strategy for electrolyte additives based on secondary-solvation-shell interactions, in which an ideal molecule combines high polarizability with a two-segment architecture. Guided by these criteria, isopropyl beta-D-1-thiogalactopyranoside (IPTG) is identified as a representative additive. Experimental and theoretical analyses reveal that IPTG predominantly resides in the secondary solvation shell and reversibly modulates the Zn2+ solvation environment. IPTG forms an interfacial electrostatic shield that homogenizes Zn2+ transport, promotes (002)-oriented growth, and enables the in situ formation of an ionically conductive IPTG-ZnS hybrid solid-electrolyte interphase. As a result, the Zn||Zn symmetric cell operates stably for 5377 h at 1 mA cm-2 and 1 mAh cm-2, and the Zn||Cu cell delivers an average Coulombic efficiency of 99.94% over 10 000 cycles at 8 mA cm-2 and 1 mAh cm-2. This work establishes generalizable screening criteria for rational electrolyte-additive design toward practical aqueous zinc-ion batteries.

ABSTRACT Aqueous zinc‐ion batteries (AZIBs) provide a new scheme for large‐scale electrochemical energy storage systems by virtue of high safety and cost‐effectiveness. However, the application of MnO 2 cathodes in AZIBs is hindered by the irreversible structural collapse originating from the Jahn–Teller effects of Mn 3+ and the sluggish diffusion kinetics. Herein, an Al/N co‐doping strategy is proposed to overcome these limitations. Partial Mn 3+ is substituted by Al 3+ in the Al/N co‐doped MnO 2 (Al/N‐MO), where the Al 3+ ions disrupt the long‐range ordering of Mn 3+ and exert a pinning effect within the lattice to restrain the axial deformation of [Mn 3+ O 6 ] units during discharge, thereby mitigating the Jahn–Teller effects. The substitution of lattice oxygen by less electronegative N atoms counteracts the lattice strain induced by Al‐doping and reduces the diffusion resistance for carriers within the tunnels, simultaneously triggering the optimization of the band gap. Furthermore, the substitutional co‐doping of Al and N induces grain refinement, provides abundant grain boundaries, and widens tunnel size, significantly boosting pseudocapacitive storage. The tailored Al/N‐MO cathode demonstrates decent electrochemical performance (315.3 mAh g −1 at 2 A g −1 and a residual capacity of 292.6 mAh g −1 over 3000 cycles), as well as stable cycling over 130 days with a quasi‐solid‐state electrolyte.

Hydrogen leakage safety concerns and the limited performance of conventional oxide-supported Pt catalysts have motivated the development of Pt-based catalysts supported on Zr-based multi-component alloys. In this study, a series of Pt-based catalysts (Pt/γ-Al2O3, Pt/ZrFe, Pt/ZrVFe, and Pt/ZrVFeTi) were synthesized via chemical reduction method. The phase structure, surface morphology, redox properties, and surface chemical states of the catalysts were characterized using various analytical techniques. Their hydrogen elimination performance was evaluated in a fixed-bed reactor under simulated operating conditions. The results indicate that Zr-based alloy-supported Pt catalysts exhibit superior catalytic activity for hydrogen elimination. Among them, Pt/ZrVFeTi catalyst demonstrates the highest performance, achieving a dynamic H2 conversion rate of 96.8 %, compared to 92.9 % for Pt/γ-Al2O3. In static tests, Pt/ZrVFeTi achieves a hydrogen elimination initiation threshold below 0.5 vol%, an initiation time of merely 2 mins, and a hydrogen elimination rate of 5.22 g H2·(kg·min)-1 highlighting its exceptional performance under ambient conditions. To unveil the underlying mechanism, density functional theory calculations were employed to analyze hydrogen adsorption energy, the Pt 3d orbital density of states, and interfacial charge transfer behavior. The calculations indicate that the enhanced performance of Pt/ZrVFeTi arises from the multi-component synergy of the ZrVFeTi support, which optimizes metal-support interaction, improves Pt dispersion, facilitates H2 adsorption, and promotes interfacial electron transfer, collectively leading to superior catalytic activity.

Manganese dioxide (MnO2) is a promising cathode material for aqueous zinc-ion batteries (AZIBs), but its performance is limited by slow ion transport kinetics and poor structural stability. In this study, the supramolecular sacrificial template strategy is introduced to overcome these challenges. Specifically, the removable P123 surfactant is selected as a dynamic template to regulate the reaction between Mn2+ and MnO4 -, controlling the formation pathway and final structure of MnO2 (denoted as PMO). Experimental analyses and theoretical calculations show that ether oxygen and hydroxyl oxygen in the P123 molecule coordinate with Mn2+. This interaction promotes the formation of a 2D nanosheet morphology, enhances the hybridization of Mn 3d and O 2p orbitals, and facilitates the emergence of oxygen defects. The multi-level structural design optimizes carrier transport dynamics and matrix stability, which results in PMO exhibiting superior cycling stability (203 mAh g-1 after 1000 cycles at 2 A g-1) and rate performance (122 mAh g-1 at 10 A g-1). Reversible and stable structural evolution during cycling is confirmed through in situ and ex situ characterization methods. This work elucidates the role of surfactants in MnO2 synthesis and paves the way for the design of high-performance electrode materials.

N-type quinone-based organics are promising cathode materials for aqueous zinc-organic batteries (AZOBs) due to their high theoretical capacity and sustainability, yet their practical performance is often restricted by low electronic conductivity and accumulated coulombic repulsion in non-polar structures. Herein, we demonstrate that a polar quinone molecule, 1,4,5,8-phenanthrenediquinone (PDQ), with an intrinsically asymmetric charge distribution at the active centers, can effectively overcome these limitations. The conjugated pi-system acts as an "electronic buffer" that dynamically modulates the partial charges at the redox-active carbonyl sites during cycling, reconciling the trade-off between electrolyte solubility and reaction kinetics. As a result, the PDQ cathode delivers a high specific capacity of 412.3 mAh g-1 at 0.64 A g-1 (redox-site utilization up to 92%), an elevated average discharge voltage of 0.88 V, and a remarkable energy density of 362.8 Wh kg-1, together with excellent rate capability and long-term cycling stability. Combined experimental and theoretical analyses reveal a reversible four-electron redox mechanism involving coordination of two Zn2+ with the carbonyl groups. This work highlights the strategic value of asymmetric charge distribution in expanding the chemical landscape of high-performance organic cathodes for next-generation AZOBs.

Carbon materials, characterized by diverse allotropes, have played critical roles in the advancement of human civilization and industrial manufacturing. As a prominent allotrope, two-dimensional (2D) graphene materials have attracted increasing attention since their discovery owing to their exceptional properties; however, they suffer from the fundamental challenges of restacking and agglomeration, which diminish their performance in practical applications. The design of three-dimensional (3D) frameworks composed of 2D graphene sheets is considered an effective strategy to resolve these issues and enable the efficient utilization of the properties of graphene. Compared with conventional fabrication methods, such as graphene oxide assembly and template-assisted chemical vapor deposition, the chemical blowing strategy is distinguished by its low cost, facile process, and superior controllability. Despite these advantages, few review articles have focused specifically on the fabrication of 3D graphene materials via chemical blowing. This review outlines the chemical blowing strategy and clarifies the fundamentals of the blowing process, its historical evolution, and the classification of 3D graphene materials. Subsequently, the recent progress in 3D graphene foams and powders fabricated via chemical blowing is detailed, with an emphasis on the underlying synthesis chemistry. Following an analysis of the correlation between 3D graphene foam and powder materials, their design considerations and functional applications are discussed. This discussion provides recommendations for the synthesis of specific 3D graphene materials and elucidates their differences and commonalities across various application scenarios. Finally, after a brief summary, current challenges, opportunities, and future research directions for the development of chemical blowing are proposed.

V2C MXene has shown potential as a catalyst for Mg-based hydrogen storage, but its catalytic role in the complete Mg-* MgH2-* Mg cycle and its distinction from the corresponding V2AlC MAX precursor remain insufficiently clarified. Herein, Mg-V2C composites were prepared from metallic Mg by hydrogen-assisted ball milling, with Mg-V2AlC composites fabricated under identical conditions as a benchmark. Structural analyses show that V2C is fragmented during milling, producing an interface-rich microstructure composed of Mg/MgH2matrices, dispersed V-containing domains, and disordered V-C-related components. Compared with V2AlC, V2C more effectively promotes Mg hydrogenation during milling and MgH2dehydrogenation, leading to a higher MgH2 fraction, lower dehydrogenation temperature, and faster hydrogen sorption kinetics. Among the investigated compositions, Mg-7 wt% V2C exhibits the most balanced overall performance, delivering high reversible capacity and rapid sorption kinetics. Its apparent dehydrogenation activation energy is reduced from 118.8 kJ mol-1H2 for pristine Mg to 62.34 kJ mol-1H2, much lower than that of Mg-7 wt% V2AlC (106.01 kJ mol-1H2). PCT analysis indicates that V2C mainly enhances hydrogen sorption kinetics without markedly altering absorption thermodynamics, while avoiding the Al-induced hydride stabilization observed in V2AlC. Kinetic fitting suggests R2-type apparent dehydrogenation behavior for Mg-V2C, distinct from the A2-type behavior of pristine Mg and Mg-V2AlC. XPS and DFT results further support the role of V2C-derived surfaces in hydrogen activation. These results demonstrate the MXene-specific catalytic advantage of V2C over V2AlC for Mg-based hydrogen storage.

Addressing the bottlenecks of catalytic efficiency and cost in clean energy conversion and electrochemical synthesis is critical for low-carbon technology advancement. Herein, we design an iron single atom supported on an inverse opal-structured carbon support (Fe-N-Cio), featuring unique hierarchical pores (micropores, mesopores, macropores) and an interlayer-confined microenvironment that synergistically enhances mass transfer and modulates the electronic structure of Fe-N4 active sites. We demonstrate that the confined microenvironment in bilayer graphene downshifts the Fe d-band center, weakening the binding strength of oxygen intermediates, favoring O-O bond cleavage and reducing the ratedetermining step energy barrier (O* -> OH*). Consequently, Fe-N-Cio outperforms commercial Pt/C, achieving a half-wave potential (E1/2) of 0.91 V with only 7.87 mV decay after 100,000 cycles. In practical device applications, the aqueous zinc-air batteries (A-ZABs) assembled with Fe-N-Cio achieve stable operation for over 1200 h, with a voltage gap change of only 20 mV. The quasi-solid-state zinc-air batteries (QSS-ZABs) exhibit an OCV of 1.48 V, a large peak power density of up to 207.73 mW cm-2, and also cycling durability for 160 h. In chlor-alkali electrolysis systems, the Fe-N-Cio||RuO2 chlor-alkali flow cell operates at 1.66 V (80 degrees C, 300 mA cm-2) with stable performance for over 110 h. This work validates the application potential of Fe-N-Cio in energy conversion and industrial electrochemistry, while systematically elucidating the regulatory mechanism of the interlayer-constrained microenvironment on singleatom catalyst's performance, which provides a paradigm for designing high-efficiency non-precious metal catalysts. (c) 2026 The Authors. Published by Published by Elsevier B.V. and Science Press on behalf of Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Sulfide-based all-solid-state batteries (ASSBs) remain constrained by the scarcity of anodes that simultaneously deliver high capacity, fast charge transport, and a chemically stable interface with sulfide electrolytes. Here, bismuth-based anodes (MA-Bi@Bi2O3) with outstanding cycle stability are developed by constructing heterogenous nanoparticles with crystalline bismuth cores and amorphous bismuth oxide shells using Bi3+-containing coordination compounds, while embedding the composite particles uniformly within micron-sized carbon framework through dual spatial confinement by organic ligands and soft carbon. Upon initial lithiation, the amorphous shell in-situ transforms into a Li2O-rich interphase, which acts as a mechanical buffer to confine volume expansion and a stable interface to suppress parasitic reactions with the sulfide electrolyte, while the carbon matrix accommodates stress and facilitates efficient transport. As a result, the MA-Bi@Bi2O3 anode exhibits exceptional cyclability, retaining 92.7% of its capacity after 2000 cycles at 4 mA cm- 2. The corresponding full cell (MA-Bi@Bi2O3 | Li6PS5Cl | LiNi0.83Co0.12Mn0.05O2) maintains 94.5% capacity (6.86 mAh cm- 2) after 500 cycles at 0.5 C. More impressively, with an ultra-high cathode loading of 160.5 mg cm- 2, it achieves a record areal capacity of 30.3 mAh cm-2 at 0.1 C. This work provides both a superior anode and a universal heterostructure design principle for high-energy-density ASSBs.

The Y0.7Mg0.3Ni2-yAly (0.05 <= y <= 0.25) compounds crystalizing in the C15b-type Laves phase structure with disordered Mg substitution for Y have been investigated. Through a combination of X-ray diffraction (XRD) and electron probe micro-analysis (EPMA), it was established that the Al substitution limit in Y0.7Mg0.3Ni2-yAly is around y approximate to 0.18. The low-Al compound (y = 0.05) undergoes hydrogen-induced disproportionation (HID), higher Al content (y >= 0.10) stabilizes the structure against both hydrogen-induced amorphization (HIA) and HID during hydrogenation. The C15b-type AB2 phase with more Mg orderly occupying 4c sites is preferentially formed upon hydrogen absorption and desorption. The Al substitution for Ni and Mg substitution for Y (YNi2 -> Y0.7Mg0.3Ni2-yAly) adjusts atomic radius ratio to between 1.372 (y = 0.10) and 1.387 (y = 0.25), thus stabilizing AB2 hydrides in an intermediate crystalline-amorphous state, enabling the recovery and stabilization of the C15b-type AB2 phase via increased Mg occupancy at the 4c sites. The empirical radius ratio limit of 1.37 for HIA is not applicable to Mg-containing AB2 systems.

Silicon dioxide (SiO) is regarded as a promising anode candidate for high-energy-density lithium-ion batteries (LIBs) owing to its superior theoretical specific capacity. However, SiO anodes encounter substantial challenges, including substantial volume expansion and persistent growth of a thick solid electrolyte interphase (SEI). In this work, a composite conductive network with dual pinning and piezoelectric effects is proposed, which is cleverly designed to improve the electrochemical reaction kinetics of the electrode. Within the proposed network architecture, single-walled carbon nanotubes (CNTs) serve as fast electronic conductors and structural protective layers, forming a three-dimensional (3D) coating network on the surface of SiO particles. Barium titanate (BTO) nanoparticles are anchored at the nodes of the CNT network through the formation of rigid anchor points, dispersing stress throughout the network. Concurrently, mechanical stress induced by electrochemical reactions prompts BTO to generate a local electric field, facilitating Li+ transport. Consequently, the developed anode (SiO@PCB) demonstrates remarkable electrochemical performance in LIBs, exhibiting a capacity retention rate of 94% even after 500 cycles at 1 A g-1. Furthermore, a capacity retention of 71.6% is demonstrated by SiO@PCB anode after 1000 cycles at 5 C in sulfide-based all-solid-state LIBs using an NCM83 cathode. This composite conductive network structure provides an effective guidance plan for achieving interface stability and long-term lithium storage of Si-based anodes. (c) 2025 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Proton exchange membrane (PEM) is widely implemented as a pivotal component in fuel cell technology. However, cost-effectiveness and complex preparation protocols of commercial PEMs remain major challenges for PEM applications. In this paper, a variety of sulfonated polyimide (SPI) composite films filled with ionic liquids @ molybdenum sulfide (ILs@MoS2) are prepared, which simultaneously yield superior proton conductivity and reduced pollution with feasibility. It is found that with increasing the ILs@MoS2 ratio, composite films with an ILs@MoS2 content of 1.5 wt% exhibit a significant improvement of 68 % in proton conductivity, increasing from 0.0778 to 0.1308 S/cm at 80 degrees C under 100 % relative humidity (RH). This result is believed to be partly attributed to the presence of the dense network of active sites and hydrogen bonds promoted by ILs@MoS2. Overall, SPI composite films modified by ILs@MoS2 demonstrate potential as alternatives for applications in PEM technologies.

Developing efficient methods for strong Si-F σ-bond activation is very important in organosilicon chemistry. We report the preparation of a novel porous organic polymer (POP)-supported single-atom Ru catalyst (POPs-Ru SACs) that was successfully applied in catalytic strong Si-F/Si-H and Si-F/Si-O cross-coupling reactions. Various disiloxanes with functional group tolerance were produced under mild conditions. Furthermore, the POPs-Ru SACs catalyst exhibited excellent recyclability for Si-F and Si-H cross-coupling reactions. Density functional theory calculations were performed to verify the mechanism of POPs-Ru SACs-catalyzed Si-F/Si-H cross-coupling reactions.

MnO2 is a promising cathode material for high-energy-density aqueous zinc-ion batteries (AZIBs) due to its high voltage and abundance. However, its electrochemical activity is seriously damaged by the sediment of discharge by-product Zn4SO4(OH)6·nH2O (ZSH), which results from the pH change of electrolyte after "dead" H+ ions are trapped within the MnO2 lattice. Herein, MnO2 co-regulated by tungsten (W) and potassium (K) (denoted as WKMO) is proposed to address this issue. The addition of W and K significantly diminishes the resistance to H+ insertion/extraction and facilitates the migration of H+ within the MnO2 lattice, relieving the heavy accumulation of ZSH during the long cycle. Meanwhile, stronger W-O and K-O bonds stabilize the layered structure of WKMO and moderate oxygen defects endow WKMO with high conductivity and increased active sites. Benefiting from the effect of W and K co-doping, exceptional rate performance (150 mAh g-1 at 5 A g-1) and long-term cycling stability (238 mAh g-1 after 1000 cycles at 1 A g-1) are exhibited by WKMO, which are 42 % and 209 % higher than the original material, respectively. The reaction mechanism of H+/Zn2+ stepwise insertion/extraction is elucidated through physical and chemical characterization. The strategy of strengthening H+ migration and mitigating ZSH deposition via multi-element modulation offers a novel approach for fostering long-life Zn//MnO2 batteries.

MXenes, with their unique layered structures and exceptional physicochemical properties, have emerged as highly promising materials for solid-state hydrogen storage. This review provides a comprehensive analysis of MXenes' intrinsic hydrogen storage capabilities and their catalytic effects on solid-state hydrogen storage materials. It begins with an overview of MXenes' fundamental properties and synthesis methods, followed by an in-depth examination of their intrinsic hydrogen storage performance, summarizing both theoretical calculations and experimental findings. Key attributes, such as high hydrogen storage capacities and reversible adsorption-desorption characteristics, are highlighted. The review also explores the catalytic role of MXenes in improving the hydrogen storage performance of light metal hydrides and complex hydrides, particularly in reducing dehydrogenation temperatures and enhancing reaction kinetics. Recent advancements in MXene-facilitated hydrogen storage are summarized, and insights into future research directions are presented to optimize their use in efficient hydrogen storage systems. While MXenes hold significant potential for advancing solid-state hydrogen storage technologies and promoting hydrogen as a clean energy carrier, challenges remain, including complex synthesis processes, limited long-term stability, and sensitivity to environmental conditions. Furthermore, structural and compositional variations in MXenes can significantly influence their catalytic activity, necessitating deeper investigations into the kinetics of hydrogen absorption and release. This review consolidates the latest research progress and outlines strategies to address these challenges, aiming to enhance the practical application of MXenes in solid-state hydrogen storage systems.