Constructing Active Sites from Atomic‐Scale Geometrical Engineering in Spinel Oxide Solid Solutions for Efficient and Robust Oxygen Evolution Reaction Electrocatalysts

尖晶石 过电位 塔菲尔方程 析氧 电催化剂 氧化物 催化作用 材料科学 化学工程 无机化学 分解水 化学 电化学 物理化学 电极 冶金 光催化 工程类 生物化学
作者
Xin Yue,Xueping Qin,Yangdong Chen,Yang Peng,Caihong Liang,Min Feng,Xinzhuo Qiu,Minhua Shao,Shaoming Huang
出处
期刊:Advanced Science [Wiley]
卷期号:8 (17) 被引量:50
标识
DOI:10.1002/advs.202101653
摘要

Spinel oxides are considered as promising low-cost non-precious metal electrocatalysts for oxygen evolution reaction (OER) due to their desirable catalytic activities and fast kinetics. However, as a result of the structural complexity of spinel oxides, systematic and in-depth studies on enhancing the OER performance of spinel oxides remain inadequate. In particular, the construction of active sites regarding the large number of unoccupied octahedral interstices has not yet been explored. Herein, more octahedral sites with high OER activities are constructed on the surface of spinel oxides via a cationic misalignment, which is induced by the defects in the spinel oxide solutions, i.e., MoFe2 O4 and CoFe2 O4 nanosheets supported on an iron foam (MCFO NS/IF). With increased active sites and modified electronic structure, the state-of-the-art electrocatalyst exhibits the excellent OER catalytic activity with an onset potential of 1.41 V versus RHE and an overpotential of 290 mV to achieve a current density of 500 mA cm-2 . Moreover, such an electrocatalyst also demonstrates fast kinetics with the Tafel slope of 38 mV dec-1 and superior durability by maintaining the OER activity at 250 mA cm-2 for 1000 h.
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