首页|Amorphous hybrid tungsten oxide-nickel hydroxide nanosheets used as a highly efficient electrocatalyst for hydrogen evolution reaction

Amorphous hybrid tungsten oxide-nickel hydroxide nanosheets used as a highly efficient electrocatalyst for hydrogen evolution reaction

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There are more challenges for alkaline hydrogen evolution reaction(HER)via simultaneously expediting the electron-coupled water dissociation process(Volmer step)and the following electrochemical H2 desorption(Heyrovsky step).Hybrid amorphous electrocatalysts are highly desirable for efficient hydrogen evolution from water-alkali electrolyzers due to the bifunctionality for the different elementary steps of HER and optimal interactions with water molecules and the reactive hydrogen intermediates(Had).Herein,the synthesis of amorphous hybrid ultrathin(tungsten oxide/nickel hydroxide)hydrate(a-[WO3/Ni(OH)2]·0.2H2O)nanosheets on nickel foam(NF)for efficient alkaline HER is described.The structural and composition features of a-[WO3/Ni(OH)2]·0.2H2O are characterized in detailed.The resulting a-[WO3/Ni(OH)2]·0.2H2O/NF electrocatalyst with the synergistic effect of both hybrid components for the HER elementary steps shows greatly improved the activity and durability for the HER with a low overpotential of-41 and-163 mV at-10 and-500 mA·cm-2,respectively,a Tafel slope as low as-72.9 mV·dec-1,and long-term stability of continuous electrolysis for at least 150 h accompanying by inappreciable overpotential change in 1 M KOH.In the hybrid a-[WO3/Ni(OH)2]·0.2H2O,Ni(OH)2 and WO3 moieties are separately responsible for accelerating dissociative adsorption of water and weakening Had adsorption strength,which is beneficial to the improvement of the alkaline HER activity.

amorphous nanomaterialbimetallic electrocatalysttungsten oxideultrathin nanosheethydrogen evolution reaction

Chao Lyu、Chenghai Dai、Yiwei Tan

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State Key Laboratory of Materials-Oriented Chemical Engineering,School of Chemistry and Chemical Engineering,Nanjing Tech University,Nanjing 211816,China

Six Talent Peaks Project in Jiangsu ProvinceResearch Fund of State Key Laboratory of Materials-Oriented Chemical Engineering

JNHB-043ZK201713

2024

10.1007/s12274-023-6185-x

纳米研究(英文版)

纳米研究(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.17(4)
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