The interconnecred PtIr alloy nanowires were uniformly deposited on carbon cloth via One-step wet chemistry method, which diameter is averaged to be 5 nm with a length of 50-200 nm. The carbon cloth supported PtIr nanowire assembly (Ptlr NA/CC) shows a larger electrochemical active surface area (ECSA) due to its 3D nanostructure and a high CO-resistance as a result from the synergistic effect of PtIr alloy. The PtIr NA/CC exhibits an extremely high mass activity and a reliable long-term stability toward methanol oxidation reaction (MOR). The superior catalytic performance on MOR can match and even surpass those best Pt-based nanowires reported recently in the literature. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

PtPd nanocubes (NCs) were uniformly deposited on the reduced graphene oxides (RGOs) via a one-pot solvothermal reduction. These PtPd NCs were enclosed with (100) facet. Their size can be tuned from 11 to 27 nm by controlling their composition. Under the optimum atomic ratio of Pt/Pd (1:5), the as-prepared RGO-supported PtPd NCs show a superior catalytic efficiency of ethanol oxidation reaction (EOR) with a specific activity of 2.3 mA cm(-2) and a mass activity of 1.08 A mg(-1) Pt, far above those for the RGO-supported Pt nano particles (0.3 mA cm(-2) for specific activity and 0.018 A mg(-1) Pt for mass activity). Besides, these EOR catalysts exhibit a high CO-tolerance without significant current decay during steady-state polarization at 0.6 V over 4000 s. Their durability is also remarkable with only 8.9% loss of their electrochemical surface area (ECSA) after 10 000 cycles of voltammetric test. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

we develop a co-precipitation strategy to prepare an ultrathin NiCu layered double hydroxide (LDH) nanosheet arrays on carbon cloth (CC). As an advanced catalysts of oxygen evolution reaction (OER) with a three-dimensional nano-architecture, the as-prepared NiCu LDH/CC hybrids exhibit a remarkably small Tafel slope (ca. 42.5 mV dec(-1)), a low overpotential (ca.290 mV required for 10 mA cm(-2)), and a high stability with 90.6% activity retention after 5 h continuous polarization at 1.6 V vs RHE. Their superior OER performance surpasses that of the commercial IrO2/C, and can compete against that of state-of-theart LDH electrocatalysts. (C) 2018 Elsevier Ltd. All rights reserved.

How to use Pt economically and efficiently in the oxygen reduction reaction (ORR) is of theoretical and practical significance for the industrialization of the proton-exchange membrane fuel cells. In order to minimize Pt consumption and optimize the ORR performance, the ORR catalysts are recommended to be designed as a porous nanostructure. Herein, we report a one-pot solvothermal strategy to prepare PtPd dendritic nanocube cages via a galvanic replacement mechanism triggered by an I- ion. These PtPd alloy crystals are nanoporous, and uniformly dispersed on reduced graphene oxides (RGOs). The size of the PtPd dendritic nanocube cages can be easily tuned from 20-80 nm by controlling their composition. Their composition is optimized to be 1:5 Pt/Pd atomic ratio for these RGO-supported PtPd dendritic nanocages. This catalyst shows superior ORR performance with a specific activity of 2.01 mA cm(-2) and a mass activity of 4.45 A mg(-1) Pt, far above those for Pt/C catalysts (0.288 mA cm(-2) for specific activity, and 0.21 A mg(-1) Pt for mass activity). In addition to ORR activity, it also exhibits robust durability with almost negligible decay in ORR mass activity after 10 000 voltammetric cycling.

we report the synthesis of porous NiCo diselenide nanosheets arrayed on carbon cloth (CC) via ion exchange with a hydroxide precursor. This bind-free three-dimensional (3D) architecture possesses the huge specific surface area and facilitates ion transport and charge transfer, leading to a superior performance in water splitting as a bifunctional catalyst for both H-2 and O-2 evolution reaction (HER and OER). The as-prepared NiCo diselenide/CC composites show a high HER capability in 0.5 M H2SO4 solution with a Tafel slope as small as 31.6 mV.dec(1) . They offer a HER current of 10 mA.cm(2) at a low overpotential of 108 mV. Their OER efficiency is also remarkable in 1 M KOH solution with a small Tafel slope of 42.3 mV.dec(1) and a low overpotential of 258 mV at 10 mA.cm(2). This 3D porous NiCo diselenide nanosheet array holds a promise as an attractive alternative to precious catalysts of water splitting with high activity and long- term stability. (C) 2016 Elsevier Ltd. All rights reserved.

An ultrathin NiCo layered double hydroxide (LDH) nanosheet array was constructed on carbon cloth (CC) by one-pot co-precipitation approach. The NiCo LDH nanosheets possess high surface specific area and their interconnected three-dimensional (3D) structure allows easy access for electrolyte ions to process rapid and reversible faradic reactions. The as-prepared NiCo LDH/CC composites show a remarkable activity for glucose oxidation, which can be used as a binder-free biosensor for glucose detection. Under optimized conditions, the sensitivity can reach up to 5.12 mu A mu M-1 cm(-2), the liner range covers four orders of magnitude from 1 mu M to 1.5 mM, and the detection limit can be low as 0.12 mu M. Besides, this biosensor also shows superior selectivity, good stability, and easy reproducibility, holding promise as a good candidate for enzymeless glucose sensing. (C) 2016 Elsevier Ltd. All rights reserved.

Ultrathin molybdenum sulfide (MoSx) nanosheets were uniformly grown on multiwalled carbon nanotubes (MWCNTs) via a solvothermal process. These MoSx nanosheets possess high density of active sites, full of the basal MoSx edges and unsaturated S atoms, and their one-dimensional (1D) core-shell architecture facilitates electron transfer and charge transport, leading to a superior performance in H2 evolution reaction (HER). These caterpillar-like MoSx@MWCNT hybrids show a high HER capability in 0.5M H2SO4 solution with a low overpotential of 102mV vs standard hydrogen electrode (SHE) and a small Tafel slope of 35mV dec−1 at 10mA cm−2. Their HER activity presents no significant decay during potential polarization at 150mV vs SHE for over 5h.

A novel electrochemical separation system was developed based on copper hexacyanoferrate/multiwalled carbon nanotube (CuHCF/MWCNT) hybrids for selectively removing cesium from wastewater. These CuHCF/MWCNT hybrids were prepared by co-precipitation strategy. The as-prepared CuHCF nanoparticles were uniformly covered on MWCNTs to form a dendritic core-shell structure. This novel structure can improve CuHCFs conductivity, making CuHCFs more accessible for ion exchange. The uptake and release of alkali ion in CuHCF/MWCNT hybrids can be shifted mutually by switching the applied potentials between the anode and cathode. This ion exchange is a fast and reversible process associated with electron transfer in CuHCFs. The potential response depends on the radius of alkali ion. Using this electrochemical adsorption system (EAS), the maximum adsorption capacity (Q(max)) of Cs+ ion for CuHCFs/MWCNT hybrids reaches up to 310 mg.g(-1) in 50 mu M Cs+ solution with a distribution coefficient K-d of 568 L.g(-1), superior to the Cs+ removal performance by the conventional adsorption system (Q(max) 230 mg.g(-1), Kd 389 L.g(-1)). Besides, CuHCF/MWCNT hybrids can be regenerated electrochemically. In addition to the advantages in Cs+ removal performance and electrochemical regenerability, they can maintain considerable stability with uptake capacity retention of 85% after 100 cycles of adsorption and regeneration. (C) 2017 Elsevier Ltd. All rights reserved.

A one-pot thermos-reduction strategy is developed to prepare ultrafine PtNi alloy nano particles (NPs), which are uniformly deposited onto reduced graphene oxides (RGOs) in the presence of polyvinylpyrrolidone (PVP). The size of PtNi NPs on RGOs can be tuned from 2.5 to 5.4 nm, after Ni was alloyed with Pt by Pt/Ni atomic ratio increased from 2:1 to 5:1. The electrochemical investigation demonstrates that Ni modification can promote the electrocatalytic activity of Pt catalysts on oxidation of methanol with a mass current density up to 1065 mA mg(-1), which is 2.65 times that of Pt catalysts without Ni modification, and comparable to and even better than those of the Pt-based catalysts reported recently. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Sluggish oxygen evolution reaction (OER) is the bottleneck for water splitting. Herein, an ultrathin Co3O4 nanosheet is uniformly deposited on the chemical exfoliated MoS2 nanosheet (ex-MoS2) via an in-situ hydrolysis and epitaxial growth. These novel noble-metal-free OER catalysts were proposed as an excellent platform for water splitting to promote the oxygen evolution activity and stability. MoS2 introduction can improve the conductivity of Co3O4 nanosheets, generate more Co3+ species in Co3O4 nanosheets during electrochemical activation and render high durability against dissolution of Co3O4 nanosheets in high potential polarization. As a result, these novel Co3O4/ex-MoS2 hybrids exhibit an excellent OER activity with a remarkable low Tafel slope (ca. 36mVdec−1), and a substantially small overpotential (ca. 290mV required for 10mAcm−2). Their OER stability is also outstanding, with 95.2% OER activity retention for 10000 potential cyclings. The superior OER performance is compatible to, and even better than state of art OER catalysts reported recently.

Pt nanoparticles (NPs) were uniformly deposited on the reduced graphene oxides (RGOs) by one-pot thermoreduction strategy with assist of MoO3. MoO3 can significantly reduce the size of Pt NPs on RGOs. These Pt NPs can be averaged to be 3.0 to 4.1 nm with MoO3 loading from 27.4 to 8.8%. Without MoO3, the size of Pt NPs can reach up to 15.2 nm. In addition, MoO3 in Pt-MoO3/RGO catalysts conducts a surface-confined reversible electron transfer. And the Pt-MoO3/RGO catalysts show strong resistance to CO poisoning and high activity towards methanol oxidation reaction (MOR). Among these Pt-based catalysts, Pt-MoO3/RGO catalysts with 16.5% MoO3 loading possess a largest MOR current up to 610 mA mg(-1) Pt with a smallest deteriorate rate of 0.000425 s(-1) polarizing for 5000 s at 0.65 V. These results demonstrate commercial feasibility for Pt catalysts to reduce significantly the amount of precious metals Pt in parallel to maintain a high MOR activity and CO tolerance. (C) 2016 Elsevier Ltd. All rights reserved.

Nanogold catalysts are very active for CO oxidation at low temperatures, showing great potential in air purification and CO elimination at ambient environment. Recently, the usage of gold catalysts for CO removal in gas masks has been commercially available, including ours. Based on previous technique, we have developed a newly designed alumina-based Au catalyst which has similar activity and better stability than our previous one. The on-site testing by industrial parters demonstrate very possitive results for application of the catalyst in CO2 laser. We are likely to provide sample for any occasion testing for removal of CO and formaldehyde, even water purification.