Chinese Journal of Catalysis ›› 2023, Vol. 48: 235-246.DOI: 10.1016/S1872-2067(23)64409-2

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Activation of partial metal sites in high-entropy oxides for enhancing thermal and electrochemical catalysis

Jinxing Mia,1, Xiaoping Chenb,1, Yajun Dinga, Liangzhu Zhanga, Jun Mac, Hui Kangc, Xianhong Wua, Yuefeng Liuc, Jianjun Chenb,*(), Zhong-Shuai Wua,*()   

  1. aState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    bState Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
    cDalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2022-01-03 Accepted:2022-02-08 Online:2023-05-18 Published:2023-04-20
  • Contact: * E-mail: chenjianjun@tsinghua.edu.cn (J. Chen),wuzs@dicp.ac.cn (Z.-S. Wu).
  • About author:First author contact:

    1Contributed equally to this work.

  • Supported by:
    China Postdoctoral Science Foundation(2021M693125);Dalian Innovation Support Plan for High Level Talents(2019RT09);Dalian National Laboratory for Clean Energy (DNL), CAS, DNL Cooperation Fund, CAS(DNL202016);Dalian National Laboratory for Clean Energy (DNL), CAS, DNL Cooperation Fund, CAS(DNL202019);Joint Fund of the Yulin University, and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002);Joint Fund of the Yulin University, and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021009)

Abstract:

High-entropy oxides (HEOs) have been tentatively and prospectively applied for chemical catalysis and energy storage. However, further enhancing their performance is difficult owing to the difficulty in precisely regulating the physical-chemical properties. In this work, a general in-situ modulation strategy of solid-phase combustion involving thiourea addition and alkali liquor treatment is developed to activate metal sites and lattice oxygen species of CuCoNiZnAl HEOs. Consequently, compared with pristine HEOs, the activated HEOs not only display higher CO2 hydrogenation and CO oxidation activities but also significantly enhanced electrocatalytic performance (discharge/charge capacities of 12049/9901 mAh/g) with excellent cycle stability (2500 h) for Li-O2 batteries. The superior performance of the activated HEOs is attributed to its facile electron transferability. This simple and effective strategy could be easily applied on a large scale, guiding the development of highly active heterogeneous HEO catalysts for various functional applications.

Key words: High entropy oxides, Solid phase combustion, Metal sites activation, Catalytic redox, Li-O2 battery