Different oxygen vacancy concentrations in Bi4O5Br2 porous microspheres modulate the surface electronic substructure and expose abundant Bi(3-δ)+ sites. Defects produced by oxygen vacancies facilitate efficient carrier separation and improve the...
Tunable V S in Zn–Cd–S QDs/ZIF-8 drive photocatalytic H 2 evolution. Vacancies compete with heterojunction electric fields to control carriers. Excess vacancies cause recombination, fewer enable efficient charge separation and high activity.
A Nb-modified HBeta zeolite enables the tandem conversion of biomass-derived 2,5-DMF to 2,5-hexanedione and 3-MCP, achieving 95.0% conversion with balanced yields through optimized Lewis/Brønsted acid synergy.
Photocatalysis remains a crucial field to investigate. It is seen as a powerful tool which allows more efficient, relatively greener and economical chemical reactions. Nevertheless, catalysts usually include rare and pricy metals, with supplies being highly dependent on geopolitics. Thus, chemists turned their attention to alternatives such as natural products or organic molecules, conciliating performances, polyvalence and easy access. Among the promising candidates, polyaromatics rise as robust species and precursors of stable radicals which could be used as photocatalysts. Triangulenes are polycyclic hydrocarbons which are expected to shine in multiple fields such as spintronics, energy and data storage or semiconductors. This work reports the studies of photocatalytic reactions including the trioxotriangulene (TOT). Through the studies of three reactions ranging from sulfoxidation to dehalogenation of 4-bromoacetophenone, including the reduction of nitroaromatics, we discuss the performances, the polyvalence and the mechanism of the systems including this triangulene. As a proof of concept, we conclude this work with a description of "a sequential RBG photoredox catalytic system" where the three reactions are successively and selectively performed in a "one-pot" fashion.
Ruthenium complexes bearing mesoionic NHC–amine ligands show ligand-architecture-dependent transfer hydrogenation activity, with the bis-ligated complex substantially outperforming its mono-ligated analogue.
Morphology-controlled Au/Cu 2 O electrocatalysts enable efficient hydrogen evolution reactions via facet-dependent hydrogen adsorption energetics.
Sodium impregnation was applied in the catalytic steam reforming of ethanol to acetone via acetaldehyde and acetic acid as intermediates over ZnO, which was synthesized by precipitation with Na2CO3 followed...
The α@δ-MnO 2 -4.5 catalyst, prepared by adjusting the KMnO 4 /MnSO 4 ratio, performed complete HCHO conversion at 50 °C. Its superior performance was attributed to the α@δ interface, which enhanced active oxygen formation and molecular adsorption.
PtAu-decorated MXene enables efficient furfural oxidation to furoic acid with simultaneous hydrogen evolution via synergistic bifunctional electrocatalysis.
Smaller Au NPs prepared by a hybrid precipitation–photoreduction method enhance the number density of Au nanoparticles (NPs) to improve the photocatalytic activity of TiO 2 towards oxidative coupling of methane.
A Pd/d-BN catalytic system was developed for BPDA synthesis, wherein highly dispersed Pd nanoparticles anchored on defect-rich BN nanosheets synergize with defect-derived acid–base pairs to accelerate the dehalogenative coupling reaction.
The dry reforming of methane (DRM) converts two major greenhouse gases, CH4 and CO2, into a synthesis gas (H2 and CO). Bimetallic DRM catalysts, such as CoPt catalysts, offer structural and electronic tunability and, in turn, potentially a higher product formation rate than monometallic systems. Bimetallic systems can occur as random or ordered alloys (intermetallics), yet it is currently unclear to what extent atomic ordering can affect the intrinsic DRM kinetics. Here, we investigate the structural dynamics of CoPt nanoparticles for DRM using operando X-ray diffraction coupled with X-ray absorption spectroscopy (XRD-XAS), and correlate our structural findings with the observed kinetics. Under DRM conditions, the intermetallic L10-CoPt phase is stable at 700 °C, whereas a random alloy phase dominates at 800 °C. Kinetic analysis of CH4 activation reveals a change in the apparent activation energy around this structural transition, i.e., a higher apparent activation energy for the disordered structure, and a lower apparent activation energy for the ordered intermetallic phase. These results provide evidence that the DRM activity of the bimetallic CoPt system is structure-sensitive; a high degree of atomic ordering enhances CH4 activation.
Bis-guanidinate Mg hydride catalyzes hydroboration of organic carbonates and CO 2 under mild conditions. Structural studies identify alkoxide, aryloxide, and formate intermediates, revealing ligand-controlled mechanistic insights.
A heterostructure with synergistic Pd single-atom proton traps and Cu + directional adsorption sites enables precise proton supply via interfacial H-bond network reconstruction, suppressing side reactions and reducing RDS energy barrier.
MoO 3 calcined under an oxidative atmosphere exhibits superior diethyl oxalate selectivity, which depends critically on the presence of Lewis acidic Mo 6+ species and their cooperative interaction with Brønsted acidic Mo–OH sites.
Bimetallic Fe 3− x Ni x Se 4 monoclinic catalysts undergo surface restructuring, which depending on the electrode architecture, promotes hydrogen evolution either via Fe leaching or by promoting Ni–Se active sites.
A Pd–Ru/MgO–Al 2 O 3 catalyst achieves 70.1% HCHO selectivity for CH 4 oxidation at 300 °C. The MgAl 2 O 4 spinel modulates surface properties and lattice oxygen mobility, suppressing deep oxidation via the MvK mechanism.
Regulating the electrochemical activity of the Sb bilayer through atom intercalation to achieve efficient bifunctional or monofunctional HER and OER electrocatalysts.
In situ grown Mo-doped CoNi LDH on MXene@Ni foam achieves excellent alkaline HER via interface tuning, and this heterostructure guides low-cost efficient electrocatalyst design.
