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Atomic Doping and Anion Reconstructed CoF 2 Electrocatalyst for Oxygen Evolution Reaction
Author(s) -
Dong Qiuchun,
Su Tingting,
Ge Wei,
Ren Yanfang,
Liu Yunlong,
Wang Wenjun,
Wang Qian,
Dong Xiaochen
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901939
Subject(s) - overpotential , tafel equation , oxygen evolution , electrocatalyst , materials science , electrochemistry , catalysis , water splitting , electrolyte , hydroxide , chemical engineering , inorganic chemistry , cobalt , electrode , chemistry , metallurgy , biochemistry , photocatalysis , engineering
Electrocatalytic water splitting is one of the most promising green solutions for large‐scale hydrogen production, which has developed rapidly in recent years. The slow reaction rate of oxygen evolution reaction (OER) has become the bottleneck to improve the electrocatalytic efficiency. Herein, Fe‐doped CoF 2 nanowire arrays on 3D nickel foam are prepared by two steps of hydrothermal reaction and fluorination process. The increased catalytic activity sites and accelerated charge transfer rate make the self‐supported Fe‐doped CoF 2 electrode show excellent OER performance in alkaline electrolyte. An overpotential of 230 mV is only required to release a current density of 10 mA cm −2 . The Tafel slope derived from the polarization curves is 59 mV dec −1 , indicating outstanding electrochemical kinetics performance. A stable output current density of 84 mA cm −2 for more than 96 h is achieved under an invariant overpotential of 338 mV, attributing to the anion reconstruction making part of CoF 2 transform into cobalt hydroxide and further improving its electrocatalytic performance.