Journal
DALTON TRANSACTIONS
Volume 49, Issue 3, Pages 750-756Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9dt04295d
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Funding
- National Natural Science Foundation of China (NSFC) [21871167]
- National Science Fund for Young Scholars (NSFC) [21201114]
- 1331 project of Shanxi Province
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Exploring efficient and stable oxygen evolution reaction (OER) catalysts with earth-abundant elements has been an urgent task in water splitting. Metal-organic frameworks (MOFs), possessing abundant active metal sites and tunable porous crystalline structures, are promising as OER catalysts. In this paper, a MOF based on benzotriazole-5-carboxylate (Co-3-btca) that contains unsaturated coordinated metal centers and a 1D channel was selected to act as an OER catalyst. To optimize the OER performance, isostructural bimetallic and trimetallic frameworks were obtained by doping with Fe and/or Ni ions. The optimized Co2.36Fe0.19Ni0.45-btca possesses the lowest overpotential of 292 mV at 10 mA cm(-2) and a small Tafel slope of 72.6 mV dec(-1). The enhanced catalytic performance could be attributed to the synergistic effect between the unsaturated coordinated Co, Fe and Ni sites, which are beneficial for the nucleophilic attack of OH- forming adsorption intermediates.
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