科研之友
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摘要
Metal organophosphonates have been explored in energy-related fields due to their high chemical and thermal stability as a type of uniformly precursor,but only few of pristine metal organophosphonate are directly used for oxygen evolution reaction (OER) catalysts.Here,a mixedvalence iron phosphonate (Fe3-ppat) has been constructed and applied to OER catalysis considered the potential active sites in pillars FeⅡ(-H2O)4(COO)2 and inorganic layers FeⅢ(μ2–OH)PO3.Specifically,isostructural trimetallic framework Fe1.7Co0.3Ni1.0-ppat possesses a minimum overpotential (291 mV),small Tafel slope (91.65 mV dec-1),and high stability up to 83 h.The enhanced catalytic performance could be mainly ascribed to the synergistic effect of NiⅡ equivalent occupancy in pillars and Co/FeⅢ in layers.
