Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (8): 1370-1378.DOI: 10.1016/S1872-2067(20)63741-X

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In situ formation of amorphous Fe-based bimetallic hydroxides from metal-organic frameworks as efficient oxygen evolution catalysts

You Xua,b, Kaili Rena, Rong Xub,*()   

  1. aState Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    bSchool of Chemical & Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore;
  • Received:2020-08-31 Accepted:2020-10-22 Online:2021-08-18 Published:2020-12-10
  • Contact: Rong Xu
  • About author:*. E-mail: rxu@ntu.edu.sg
  • Supported by:
    This work was supported by the Nanyang Technological University and the National Natural Science Foundation of China(21701141)

Abstract:

Oxygen evolution from water driven by electrocatalysis or photocatalysis poses a significant challenge as it requires the use of efficient electro-/photo-catalysts to drive the four-electron oxygen evolution reaction (OER). Herein, we report the development of an effective strategy for the in situ chemical transformation of Fe-based bimetallic MIL-88 metal-organic frameworks (MOFs) into corresponding bimetallic hydroxides, which are composed of amorphous ultrasmall nanoparticles and afford an abundance of catalytically active sites. Optimized MOF-derived NiFe-OH-0.75 catalyst coated on glassy carbon electrodes achieved a current density of 10 mA cm ‒2 in the electrocatalytic OER with a small overpotential of 270 mV, which could be decreased to 235 mV when loading the catalysts on a nickel foam substrate. Moreover, these MOF-derived Fe-based bimetallic hydroxides can be used as efficient cocatalysts when combined with suitable photosensitizers for photocatalytic water oxidation.

Key words: Bimetallic hydroxides, Electrocatalysis, Metal-organic frameworks, Oxygen evolution reaction, Photocatalysis