摘要
Acidic-stable oxygen evolution reaction(OER)catalysts based on earth-abundant materials are important but rare for the proton exchange membrane-based water electrolysis.In this study,a metal-containing hydrogen-bonded organic framework(HOF)of manganese coordinated with 2,2'-bipyridine-6,6'-dicarboxylate ligands,Mn(bda),interconnected through hydrogen bonding and π-π stacking is used as a heterogeneous OER catalyst(Mn(bda)-HOF)for acidic water oxidation and exhibits a considerable OER performance.Electrochemical results show that Mn(bda)-HOF displays a turn of frequency of 1 s^(-1) at an overpotential of 870 mV.Meanwhile,this Mn(bda)-HOF shows an unusual pH dependence on performance,where the reaction rate increases with the decrease of pH.A comprehensive mechanistic study reveals that the charge transfer triggered coupling of two metal-oxo species Mn^(5+)(O)is the rate-determining step,which leads to this unusual pH dependence on the OER performance.
基金
supported by the National Natural Science Foundation of China(Nos.22172011,22088102,and 22301248)
the National Key R&D Program of China(2022YFA0911900)
the Fundamental Research Funds for the Central Universities(DUT23LAB611).
