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Interconnected Network of Core–Shell CoP@CoBiPi for Efficient Water Oxidation Electrocatalysis under Near Neutral Conditions
Author(s) -
Cui Liang,
Qu Fengli,
Liu Jingquan,
Du Gu,
Asiri Abdullah M.,
Sun Xuping
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700113
Subject(s) - overpotential , electrochemistry , electrocatalyst , catalysis , water splitting , electrolyte , polarization (electrochemistry) , aqueous solution , chemistry , chemical engineering , electrode , inorganic chemistry , photocatalysis , biochemistry , engineering
Developing earth‐abundant electrocatalysts for efficient and stable water oxidation under near neutral conditions is of great importance but still remains a key challenge. Herein, we demonstrate the development of an interconnected network of core–shell CoP@CoBiPi through anodic polarization of a CoP nanoarray in potassium borate aqueous electrolyte (KBi). This 3 D CoP@CoBiPi exhibits high catalytic activity for water oxidation at pH 9.2 and needs an overpotential ( η ) of only 410 mV to drive a geometrical catalytic current density of 10 mA cm −2 , with a high turnover frequency of 819 h −1 at an overpotential of 610 mV. Remarkably, this catalyst also demonstrates high long‐term electrochemical stability with its activity being maintained for at least 27 h in KBi. This study provides us an attractive earth‐abundant 3 D catalyst electrode for water‐splitting devices toward efficient and stable water oxidation under benign conditions.