Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (8): 1395-1403.DOI: 10.1016/S1872-2067(20)63739-1

• Articles • Previous Articles     Next Articles

Selective Se doping of NiFe2O4 on an active NiOOH scaffold for efficient and robust water oxidation

Yuan Huanga,b, Jian-Jun Wanga,b,$(), Yang Zoua, Li-Wen Jianga, Xiao-Long Liud, Wen-Jie Jiangd, Hong Liua,c,#(), Jin-Song Hud,*()   

  1. aState Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
    bShenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, China
    cInstitute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan 250022, Shandong, China
    dBeijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, China
  • Received:2020-09-24 Accepted:2020-11-18 Online:2021-08-18 Published:2020-12-10
  • Contact: Jian-Jun Wang,Hong Liu,Jin-Song Hu
  • About author:$. E-mail: wangjianjun@sdu.edu.cn
    #. E-mail: hongliu@sdu.edu.cn,
    *. E-mail: hujs@iccas.ac.cn,
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(21802086);This work was supported by the National Natural Science Foundation of China(51732007);This work was supported by the National Natural Science Foundation of China(21902162);Shandong Provincial Natural Science Foundation(ZR2019MB048);QiLu Young Scientist Program of Shandong University, Beijing National Laboratory for Molecular Sciences Program(BNLMS201802);Shenzhen Fundamental Research Program(JCYJ20190807093411445);the Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong.

Abstract:

There remains a challenge in designing electrocatalysts for water oxidation to create highly efficient catalytic sites for the oxygen evolution reaction (OER) while maintaining their robustness at large outputs. Herein, an etching-assisted synthesis approach was developed to integrate highly active NiFe2O4 nanoparticles with a robust and active NiOOH scaffold directly on commercial stainless steel. A precise selenization strategy was then introduced to achieve selective Se doping of NiFe2O4 to further enhance its intrinsic OER activity while maintaining a three-dimensional NiOOH nanosheet array as a robust scaffold for prompt mass transfer and gas evolution. The resulting NiFe2O4‒xSex/NiOOH electrode exhibited superior electrocatalytic activity with low overpotentials of 153 and 259 mV to deliver benchmark current densities of 10 and 500 mA cm -2, respectively. More importantly, the catalyst exhibited remarkable durability at a stable current output of 100 mA cm -2 for hundreds of hours. These findings may open up opportunities for exploring efficient and robust electrocatalysts for scalable hydrogen production with practical materials.

Key words: Water oxidation, Selective selenization, NiFe2O4, NiOOH, Heterostructure