塔菲尔方程
过电位
纳米棒
析氧
非阻塞I/O
材料科学
催化作用
电化学
化学工程
纳米技术
化学
电极
物理化学
生物化学
工程类
作者
Yuhua Zhang,Guanmei Wang,Na Li,Di Ke,Jun Wang
出处
期刊:ChemNanoMat
[Wiley]
日期:2022-11-30
卷期号:9 (1)
被引量:1
标识
DOI:10.1002/cnma.202200422
摘要
Abstract Rare earth (RE) elements are promising to improve the property of catalysts due to their distinctive 4 f electron orbital. Herein, a heterogeneous material of Fe−NiS nanorods encapsulated in Ce‐doped NiO x with 3D core‐shell structure (Fe−NiS@NiCeO x ) was constructed on carbon cloth (CC) through a straightforward solvothermal reaction and a subsequent electrodeposition for enhancing the electrocatalytic performance towards oxygen evolution reaction (OER) in alkaline medium. The strategy facilitates a synergy among the components, including an enlarged electrochemical active area of Fe−NiS by the involvement of Fe and an ameliorated durability of Fe−NiS nanorod by encapsulated in NiCeO x shell. Furthermore, a flexible valence alternation between Ce (III) and Ce (IV) speeds up the charges transfer between Ni(II) and Ni(III). In 1.0 mol L −1 KOH, the Fe−NiS@NiCeO x /CC electrode shows the lowest overpotential of 230 mV to achieve the current density of 50 mA cm −2 , the smallest Tafel slope of 63 mV dec −1 and a superior durability with only a potential fluctuation of 0.01 V on a chronopotentiometry curve within 24 h. Further research suggests that Fe−NiS@NiCeO x /CC exhibits the best performance of the three as‐fabricated Fe−NiS@NiREO x /CC (RE=Ce, La, Pr) catalysts.
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