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Efficient and Stable Bifunctional Electrocatalysts Ni/Ni x M y (M = P, S) for Overall Water Splitting
Author(s) -
Chen GaoFeng,
Ma Tian Yi,
Liu ZhaoQing,
Li Nan,
Su YuZhi,
Davey Kenneth,
Qiao ShiZhang
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201505626
Subject(s) - bifunctional , water splitting , materials science , oxygen evolution , anode , cathode , electrolysis , chemical engineering , electrode , electrocatalyst , electrolysis of water , noble metal , hydrogen , nanotechnology , inorganic chemistry , metal , metallurgy , electrochemistry , catalysis , chemistry , electrolyte , biochemistry , organic chemistry , photocatalysis , engineering
Development of easy‐to‐make, highly active, and stable bifunctional electrocatalysts for water splitting is important for future renewable energy systems. Three‐dimension (3D) porous Ni/Ni 8 P 3 and Ni/Ni 9 S 8 electrodes are prepared by sequential treatment of commercial Ni‐foam with acid activation, followed by phosphorization or sulfurization. The resultant materials can act as self‐supported bifunctional electrocatalytic electrodes for direct water splitting with excellent activity toward oxygen evolution reaction and hydrogen evolution reaction in alkaline media. Stable performance can be maintained for at least 24 h, illustrating their versatile and practical nature for clean energy generation. Furthermore, an advanced water electrolyzer through exploiting Ni/Ni 8 P 3 as both anode and cathode is fabricated, which requires a cell voltage of 1.61 V to deliver a 10 mA cm −2 water splitting current density in 1.0 m KOH solution. This performance is significantly better than that of the noble metal benchmark—integrated Ni/IrO 2 and Ni/Pt–C electrodes. Therefore, these bifunctional electrodes have significant potential for realistic large‐scale production of hydrogen as a replacement clean fuel to polluting and limited fossil‐fuels.