文献类型：期刊文献

英文题名：Multiple Vacancies on (111) Facets of Single-Crystal NiFe2O4 Spinel Boost Electrocatalytic Oxygen Evolution Reaction

作者：Chen, Xiaokang[1];Zhang, Xiaohui[1];Zhuang, Linzhou[2];Zhang, Wei[1];Zhang, Naichi[1];Liu, Hongwei[3];Zhan, Tianrong[4];Zhang, Xiaoli[5];She, Xilin[1];Yang, Dongjiang[1]

机构：[1]Qingdao Univ, Collaborat Innovat Ctr Marine Biobased Mat, State Key Lab Biofibers & Ecotext, Sch Environm Sci & Engn, Qingdao 266071, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia;[4]Qingdao Univ Sci & Technol, Minist Educ, Key Lab Opt Elect Sensing & Analyt Chem Life Sci, Qingdao 266042, Peoples R China;[5]Zhengzhou Univ, Sch Mat Sci & Engn, State Ctr Int Cooperat Designer Low Carbon & Envi, Zhengzhou 450001, Peoples R China

年份：2020

卷号：15

期号：23

起止页码：3995

外文期刊名：CHEMISTRY-AN ASIAN JOURNAL

收录：;EI(收录号：20204409417228);WOS:【SCI-EXPANDED(收录号:WOS:000585920400001)】；

基金：This work is financially supported by the National Nature Science Foundation of China (Nos. 51473081, 51672143, 81502246 and 22005165), Taishan Scholars Program, Outstanding Youth of Natural Science in Shandong Province (JQ201713), ARC Discovery Project (No. 170103317), and the Key Research and Development Program of Shandong Province (Project No. 2017GSF18128), the Natural Science Foundation of Shandong Province (ZR2018BEM002), and the Applied Basic Research of Qingdao City (Special Youth Project, No. 19-6-2-83-cg).

语种：英文

外文关键词：Vacancy; NiFe2O4; electrocatalysts; oxygen evolution reaction; Ar plasma

摘要：Oxygen evolution reaction (OER) as the rate-determining reaction of water splitting has been attracting enormous attention. At present, only some noble-metal oxide materials (IrO2 and RuO2) have been reported as efficient OER electrocatalysts for OER. However, the high cost and scarcity of these noble-metal oxide materials greatly hamper their large-scale practical application. Herein, we synthesize 100% (111) faceted NiFe2O4 single crystals with multiple vacancies (cation vacancies and O vacancies). The (111) facets can supply enough platform to break chemical bonds and enhance electrocatalytic activity, due to its high density of atomic steps and kink atoms. Compared to NiFe2O4 (without vacancies), the as-synthesized NiFe2O4-Ar (with vacancies) exhibits a dramatically improved OER activity. The NiFe2O4-Ar-30 shows the lowest onset potential (1.45 V vs RHE) and the best electrocatalytic OER activity with the lowest overpotential of 234 mV at 50 mA cm(-2). Furthermore, based on the theoretical calculations that the introduction of multiple vacancies can effectively modulate the electronic structure of active centers to accelerate charge transfer and reaction intermediates adsorption, which can reduce the reaction energy barrier and enhance the activity of electrochemical OER.