Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (2): 293-297.doi: 10.1007/s40242-021-0447-5

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Improving the Catalytic Efficiency of NiFe-LDH/ATO by Air Plasma Treatment for Oxygen Evolution Reaction

LEI Chong1, LI Wenzheng1, WANG Gongwei1, ZHUANG Lin1,2, LU Juntao1, XIAO Li1   

  1. 1.College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University, Wuhan 430072, P. R. China;
    2. Institute for Advanced Studies, Wuhan University, Wuhan 430072, P. R. China
  • Received:2020-12-31 Online:2021-04-01 Published:2021-03-29
  • Contact: XIAO Li E-mail:chem.lily@whu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos.21872108, 21633008), the National Key Research and Development Program of China(No.2016YFB0101203), and the Fund of the Wuhan University Innovation Team, China(Nos.2042017kf0232, 2042020kf1073, 2042019kf0270).

Abstract: Developing efficient catalysts toward the oxygen evolution reaction(OER) is important for water splitting and rechar-geable metal-air batteries. Although NiFe oxides are consi-dered as potentially applicable catalysts in the alkaline media, there are still a limited numbers of researches working on membrane electrode assembly(MEA) fed with pure water due to their poor electrical conductivity. In this work, antimony doped tin oxide(ATO) has been employed as conductive supports where NiFe layered double hydroxide uniformly dispersed[named NiFe-LDH(layered double hydroxide)/ATO]. The catalysts have been synthesized by a one-step co-precipitation method, and then NiFe-LDH/ATO-air plasma was obtained through mild air plasma treatment. According to XPS analysis, binding energies of Ni2p and Fe2p were shifted negatively. Moreover, a new signal of low oxygen coordination appeared on O1s spectrum after air plasma treatment. These XPS results indicated that oxygen vacancies(Ov) were generated after air plasma treatment. Electrochemical mea-surement indicated that the vacancy-rich NiFe-LDH/ATO-air plasma exhibited better performance than NiFe-LDH/ATO not only in 1 mol/L KOH solutions but also in an alkaline polymer electrolyte water electrolyzer(APEWE) fed with deionized water. This work provides a feasible way to design practical catalysts used in electrochemical energy conversion systems by choosing corrosion resistance supports and defect engineering.

Key words: Antimony doped tin oxide(ATO), Air plasma, Oxygen vacancy, Alkaline polymer electrolyte water electrolyzer(APEWE)