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Oxygen defect engineering in cobalt iron oxide nanosheets for promoted overall water splitting

文献类型：期刊论文

作者Guo, Chengying1; Liu, Xuejing1; Gao, Lingfeng1; Ma, Xiaojing1; Zhao, Mingzhu1; Zhou, Jinzhi1; Kuang, Xuan1; Deng, Weiqiao2,3; Sun, Xu1; Wei, Qin1
刊名JOURNAL OF MATERIALS CHEMISTRY A
出版日期2019-10-14
卷号7期号:38页码:21704-21710
ISSN号2050-7488
DOI10.1039/c9ta06537g
通讯作者Sun, Xu(chm_sunx@ujn.edu.cn)
英文摘要Transition metal oxides have attracted tremendous attention as active and stable electrocatalysts for hydrogen or oxygen evolution from water splitting. However, their application as bifunctional catalysts for overall water splitting is still hindered by their limited activity. In this paper, via the surface defect engineering strategy, a bifunctional electrocatalyst based on oxygen vacancy enriched CoFe2O4 (r-CFO) nanosheets was successfully fabricated, exhibiting desired overall water splitting activity. DFT calculations demonstrated that benefitting from the incorporation of oxygen vacancies, the adsorption energy (Eads) of H2O and the Gibbs free energy change for hydrogen adsorption (Delta G(H*)) are both well optimized, leading to the fine modulation of active site activity. Meanwhile, along with oxygen vacancy doping, the density of states across the Fermi level increased as well, which would be conducive to fast electron transportation. As expected, the r-CFO catalyst afforded obviously lower overpotentials of 280 mV and 121 mV to achieve a current density of 10 mA cm(-2) for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. Furthermore, r-CFO exhibited excellent overall water splitting activity with a voltage of 1.53 V to reach a current density of 10 mA cm(-2). This work highlights the vital role of surface defect engineering based on transition metal oxides toward advanced electrocatalysts.
WOS关键词LAYERED DOUBLE HYDROXIDE ; HIGHLY EFFICIENT ; BIFUNCTIONAL ELECTROCATALYSTS ; HYDROGEN EVOLUTION ; VACANCIES ; REDUCTION ; ELECTRODE ; ARRAY
资助项目National Natural Science Foundation of China[21601064] ; National Natural Science Foundation of China[21627809] ; National Natural Science Foundation of China[21675063] ; National Natural Science Foundation of China[21607055] ; National Natural Science Foundation of China[21575050] ; Natural Science Foundation of Shandong Province[ZR2016BQ10] ; Key Research and Development Project of Shandong Province[2019GGX104021]
WOS研究方向Chemistry ; Energy & Fuels ; Materials Science
语种英语
出版者ROYAL SOC CHEMISTRY
WOS记录号WOS:000490235800053
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province ; Natural Science Foundation of Shandong Province ; Key Research and Development Project of Shandong Province ; Key Research and Development Project of Shandong Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province ; Natural Science Foundation of Shandong Province ; Key Research and Development Project of Shandong Province ; Key Research and Development Project of Shandong Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province ; Natural Science Foundation of Shandong Province ; Key Research and Development Project of Shandong Province ; Key Research and Development Project of Shandong Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province ; Natural Science Foundation of Shandong Province ; Key Research and Development Project of Shandong Province ; Key Research and Development Project of Shandong Province
源URL[http://cas-ir.dicp.ac.cn/handle/321008/172570]  
专题大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者Sun, Xu
作者单位1.Univ Finan, Key Lab Interfacial React & Sensing Anal Univ Sha, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
3.Shandong Univ, Inst Mol Sci & Engn, Qingdao 266237, Shandong, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Chengying,Liu, Xuejing,Gao, Lingfeng,et al. Oxygen defect engineering in cobalt iron oxide nanosheets for promoted overall water splitting[J]. JOURNAL OF MATERIALS CHEMISTRY A,2019,7(38):21704-21710.
APA Guo, Chengying.,Liu, Xuejing.,Gao, Lingfeng.,Ma, Xiaojing.,Zhao, Mingzhu.,...&Wei, Qin.(2019).Oxygen defect engineering in cobalt iron oxide nanosheets for promoted overall water splitting.JOURNAL OF MATERIALS CHEMISTRY A,7(38),21704-21710.
MLA Guo, Chengying,et al."Oxygen defect engineering in cobalt iron oxide nanosheets for promoted overall water splitting".JOURNAL OF MATERIALS CHEMISTRY A 7.38(2019):21704-21710.

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来源：大连化学物理研究所

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