In situ electrochemically converting Fe_2O_3-Ni(OH)_2 to NiFe_2O_4-NiOOH:a highly efficient electrocatalyst towards water oxidation

作     者：Fang Zhang 张芳;史艳梅;薛涛;张競方;梁瑜;张兵

作者机构：Department of Chemistry School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China. Analysis Center of Tianjin University Tianjin University Tianjin 300072 China 

基　　金：supported by the National Natural Science Foundation of China(21422104) the Key Project of Natural Science Foundation of Tianjin City(16JCZDJC30600) 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2017年第60卷第4期

页      码：324-334页

摘      要：To develop low-cost, earth-abundant NiFe- based materials as highly efficient oxygen evolution reaction （OER） electrocatalysts and to probe new catalytic species are still great challenges to now. Here, an in situ forma- tion of OER active NiFe2O4-NiOOH nanosheet arrays is demonstrated as a highly efficient OER electrocatalyst by the anodization of Fe203 domains anchored on Ni（OH）2 nanosheet arrays. The as-converted product can deliver the current density of 30 mA cm-2 with a small overpotential of 240 mV, and only requires an overpotential of 410 mV to achieve an amazing huge current density of 3000 mA cm-2. In situ potential-dependent Raman spectroscopy reveals that Ni（OH）2 in the composite is easier to be oxidized to NiOOH than pure Ni（OH）2, and the newly formed NiOOH reacts with the nearby Fe2O3 to produce hybrid NiFe2O4-NiOOH. It is found that the cooperative effect of the in situ formed NiFe2O4 and NiOOH as well as the hydrophilic and aero- phobic electrode surface make main contribution to the outstanding OER activity of the catalyst. This work will bring new perspectives to the recognition of the origin of NiFe composite materials for OER and provide a mild method to synthesize amorphous spinel materials at room temperature.

主 题 词：chemical transformation electrocatalysis Ramanspectroscopy oxygen evolution reaction nanosheet array 

学科分类：081702[081702] 081704[081704] 08[工学] 0817[工学-轻工类] 

核心收录：

D　O　I：10.1007/s40843-017-9017-6

馆 藏 号：203230194...