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Regulating the Spin State of Fe III by Atomically Anchoring on Ultrathin Titanium Dioxide for Efficient Oxygen Evolution Electrocatalysis
Author(s) -
Shen Guoqiang,
Zhang Rongrong,
Pan Lun,
Hou Fang,
Zhao Yingjie,
Shen Zeyu,
Mi Wenbo,
Shi Chengxiang,
Wang Qingfa,
Zhang Xiangwen,
Zou JiJun
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913080
Subject(s) - overpotential , oxygen evolution , electrocatalyst , catalysis , oxygen , adsorption , chemistry , ferric , oxidation state , inorganic chemistry , spin states , titanium dioxide , chemical engineering , materials science , electrochemistry , electrode , metallurgy , organic chemistry , engineering
Ferric oxides and (oxy)hydroxides, although plentiful and low‐cost, are rarely considered for oxygen evolution reaction (OER) owing to the too high spin state (e g filling ca. 2.0) suppressing the bonding strength with reaction intermediates. Now, a facile adsorption–oxidation strategy is used to anchor Fe III atomically on an ultrathin TiO 2 nanobelt to synergistically lower the spin state (e g filling ca. 1.08) to enhance the adsorption with oxygen‐containing intermediates and improve the electro‐conductibility for lower ohmic loss. The electronic structure of the catalyst is predicted by DFT calculation and perfectly confirmed by experimental results. The catalyst exhibits superior performance for OER with overpotential 270 mV @10 mA cm −2 and 376 mV @100 mA cm −2 in alkaline solution, which is much better than IrO 2 /C and RuO 2 /C and is the best iron‐based OER catalyst free of active metals such as Ni, Co, or precious metals.