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Urchin‐Like Cobalt‐Copper (Hydr)oxides as an Efficient Water Oxidation Electrocatalyst
Author(s) -
Ye Qilun,
Hou Xiyan,
Lee Husileng,
Liu Hongzhen,
Lu Liangjie,
Wu Xiujuan,
Sun Licheng
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000312
Subject(s) - overpotential , chemistry , cobalt , electrocatalyst , copper , oxygen evolution , electrochemistry , water splitting , catalysis , inorganic chemistry , electron transfer , chemical engineering , anode , electrode , photochemistry , organic chemistry , photocatalysis , engineering
The development of ecient and low‐cost oxygen evolution reaction (OER) catalysts is essential for the generation of clean hydrogen energy from water splitting. Herein, a novel hierarchical urchin‐like cobalt‐copper (hydr)oxide in situ grown on copper foam (CoCuO x H y (S)/CF) was synthesized through the electrochemical transformation of cobalt‐copper sulfides (Co 9 S 8 ‐Cu 1.81 S) via anodization process. This CoCuO x H y (S)/CF anode exhibited a low overpotential ( η ) of 274 mV at a current density of 100 mA cm −2 with a robust durability over a period of 40 h when operated at 10 mA cm −2 . Further investigations imply that the unique nanowires aggregated urchin‐like structure of CoCuO x H y (S) derived from the in situ anion exchange process could facilitate the exposure of active sites and accelerate electron transfer. More importantly, the incorporation of copper resulted in an electronic delocalization around the cobalt species, which contributed to reach a high‐valent catalytically active cobalt species and further improved the OER performance.