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Activating CoOOH Porous Nanosheet Arrays by Partial Iron Substitution for Efficient Oxygen Evolution Reaction
Author(s) -
Ye ShengHua,
Shi ZiXiao,
Feng JinXian,
Tong YeXiang,
Li GaoRen
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201712549
Subject(s) - nanosheet , tafel equation , overpotential , x ray absorption fine structure , oxygen evolution , materials science , anode , chemistry , chemical engineering , inorganic chemistry , electrochemistry , electrode , nanotechnology , spectroscopy , engineering , physics , quantum mechanics
Iron‐substituted CoOOH porous nanosheet arrays grown on carbon fiber cloth (denoted as Fe x Co 1−x OOH PNSAs/CFC, 0≤x≤0.33) with 3D hierarchical structures are synthesized by in situ anodic oxidation of α‐Co(OH) 2 NSAs/CFC in solution of 0.01 m (NH 4 ) 2 Fe(SO 4 ) 2 . X‐ray absorption fine spectra (XAFS) demonstrate that CoO 6 octahedral structure in CoOOH can be partially substituted by FeO 6 octahedrons during the transformation from α‐Co(OH) 2 to Fe x Co 1−x OOH, and this is confirmed for the first time in this study. The content of Fe in Fe x Co 1−x OOH, no more than 1/3 of Co, can be controlled by adjusting the in situ anodic oxidation time. Fe 0.33 Co 0.67 OOH PNSAs/CFC shows superior OER electrocatalytic performance, with a low overpotential of 266 mV at 10 mA cm −2 , small Tafel slope of 30 mV dec −1 , and high durability.