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  • Accelerating Neutral Hydrogen Evolution with Tungsten Modulated Amorphous Metal Hydroxides

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    YANG171265.pdf (638.5Kb)
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    Accepted Manuscript (AM)
    Author(s)
    Zhang, Le
    Liu, Peng Fei
    Li, Yu Hang
    Wang, Chong Wu
    Zu, Meng Yang
    Fu, Huai Qin
    Yang, Xiao Hua
    Yang, Hua Gui
    Griffith University Author(s)
    Yang, Huagui
    Fu, Huai Qin
    Year published
    2018
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    Abstract
    Developing efficient, low-cost, and biocompatible electrocatalysts toward hydrogen evolution reaction (HER) in neutral environments is vital to the development of a hybrid water splitting–biosynthetic system to achieve high-efficiency solar-to-fuels conversion. We report here a strategy to improve the sluggish HER kinetics on 3d transition-metal hydroxides by incorporating tungsten through a one-step electrodeposition method. The prepared amorphous CoW(OH)x delivers high HER activity in neutral solution, which only requires overpotentials of −73.6 and −114.9 mV to achieve the current densities of −10 and −20 mA cm–2 in 1.0 ...
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    Developing efficient, low-cost, and biocompatible electrocatalysts toward hydrogen evolution reaction (HER) in neutral environments is vital to the development of a hybrid water splitting–biosynthetic system to achieve high-efficiency solar-to-fuels conversion. We report here a strategy to improve the sluggish HER kinetics on 3d transition-metal hydroxides by incorporating tungsten through a one-step electrodeposition method. The prepared amorphous CoW(OH)x delivers high HER activity in neutral solution, which only requires overpotentials of −73.6 and −114.9 mV to achieve the current densities of −10 and −20 mA cm–2 in 1.0 M phosphate buffer solution (PBS), respectively. The activity can be ascribed to the synergistic effects between Co and W, where Co sites facilitate H2O dissociation to generate Had intermediates and W sites could effectively convert Had to H2. Meanwhile, the amorphous architecture features homogeneously dispersed Co and W atoms that avoid crystalline phase separation, further strengthening their collaborative interactions. Similar enhanced HER activity is also observed on the electrodeposited NiW(OH)x electrocatalyst, suggesting the universality of this strategy for accelerating HER in neutral environments.
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    Journal Title
    ACS CATALYSIS
    Volume
    8
    Issue
    6
    DOI
    https://doi.org/10.1021/acscatal.8b01076
    Copyright Statement
    This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS CATALYSIS, © 2018 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acscatal.8b01076
    Subject
    Inorganic chemistry
    Organic chemistry
    Chemical engineering
    Publication URI
    http://hdl.handle.net/10072/384657
    Collection
    • Journal articles

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