J. Mater. Sci. Technol. ›› 2022, Vol. 120: 129-138.DOI: 10.1016/j.jmst.2021.12.049

• Research Article • Previous Articles     Next Articles

Interfacial engineering regulated by CeOx to boost efficiently alkaline overall water splitting and acidic hydrogen evolution reaction

Jian Chena,b, Zhen Hua,b, Yang Oua,b, Qinghua Zhangc, Xiaopeng Qia,b,*(), Lin Guc, Tongxiang Lianga,b,*()   

  1. aCollege of Rare Earth, Jiangxi University of Science and Technology, Ganzhou 341000, China
    bFaculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
    cInstitute of Physics, Chinese Academy of Science, Beijing 100190, China
  • Received:2021-08-13 Revised:2021-10-22 Accepted:2021-12-06 Published:2022-09-01 Online:2022-03-12
  • Contact: Xiaopeng Qi,Tongxiang Liang
  • About author:liang_tx@126.com (T. Liang).
    * College of Rare Earth, Jiangxi University of Science and Technology, Ganzhou 341000, China. E-mail addresses: qxpai@163.com (X. Qi),

Abstract:

Development of a low-cost and durable bifunctional electrocatalyst with high catalytic activity by hybridizing rare earth metal and non-noble metal is of utmost significance. Herein, a bifunctional electrocatalyst consisting of MoO2 and CeOx heterostructure is synthesized via interfacial engineering. Particularly, due to its unique hetero-interface with abundant oxygen vacancies, the MoO2-CeOx/NF is able to exhibit outstanding hydrogen evolution reaction (HER) performance with an overpotential of 26 mV at 10 mA cm-2, and a preferable oxygen evolution reaction (OER) overpotential of 272 mV at 100 mA cm-2 in 1 M KOH. The recorded HER and OER overpotentials of MoO2-CeOx/NF are clearly smaller than those of Pt/C (HER overpotential of 27 mV) and RuO2 (OER overpotential of 393 mV) at the same current density. More importantly, MoO2-CeOx/NF can also exhibit good HER activity with an overpotential of 50 mV at 10 mA cm-2 in acidic media. Thus, it is expected that this work can offer a new approach in the realization of high-catalytic alkaline overall water splitting and acidic HER performance through the rational design of rare-earth metal and non-noble metal heterostructure.

Key words: Heterostructure, Oxygen vacancies, Cerium oxideOverall water splitting