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Phosphorus‐Doped CuCo 2 O 4 Oxide with Partial Amorphous Phase as a Robust Electrocatalyst for the Oxygen Evolution Reaction
Author(s) -
Guo Zhen,
Pang Yongyu,
Xie Huan,
He Guanjie,
Parkin Ivan P.,
Chai GuoLiang
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202001312
Subject(s) - tafel equation , oxygen evolution , overpotential , electrocatalyst , materials science , spinel , oxide , amorphous solid , electrolysis , electrolyte , inorganic chemistry , electrolysis of water , chemical engineering , chemistry , electrochemistry , metallurgy , electrode , crystallography , engineering
Abstract It is highly desirable to develop efficient and low‐cost electrocatalysts for the oxygen evolution reaction (OER) to improve the efficiency of water electrolysis. Here, we report a strategy doping with a small amount of phosphorus to make inactive and low‐cost spinel CuCo 2 O 4 (CCO) turn into high‐efficiency and superior to the noble metal catalyst RuO 2 . The spinel CuCo 2 O 4 −P 0.5 (CCP 0.5 ) shows the best OER performance with a small overpotential of 290 mV at a current density of 10 mA cm −2 and a low Tafel slope of 68 mV dec −1 in an alkaline electrolyte. The phosphorus doping induces the production of an amorphous phase that provides a large number of active sites, and the synergistic effect of the crystalline phase and amorphous phase significantly improves the OER activity of CCO. It is also revealed that the conductivity of CCO is improved compared with pristine CCO. Our work highlights that non‐metallic element doping is an effective strategy to greatly enhance the OER performance of spinel transition metal oxide electrocatalysts.