【摘 要】
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Bimetallic metal organic framework(MOF)as a precursor to prepare catalysts with bifunctional catalytic activity of oxygen evolution reaction(OER)and hydrogen ev
【机 构】
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State Key Laboratory of Separation Membranes and Membrane Processes/National Center for Internationa
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Bimetallic metal organic framework(MOF)as a precursor to prepare catalysts with bifunctional catalytic activity of oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)attracts more and more attention.Herein,hollow oxygen deficiency-enriched NiFe2O4 is synthesized by pyrolytic FeNi bimetallic MOF.The defects of rGO during carbonization can act as nucleation sites for FeNi particles.After nucleation and N doping,the FeNi particles were served as catalysts for the deposition of dissolved carbon in the defects of the N/rGO.These deposited carbon,like a bridge,connect N/rGO and hollow oxy-gen deficiency-enriched NiFe2O4 together,which giving full play to the advantages of N/rGO in fast elec-tron transfer,thereby improving its catalytic activity.The resultant NiFe2O4@N/rGO-800 exhibits a low overpotential of 252 mV at 20 mA cm-2 for OER and 157 mV at 10 mA cm-2 for HER in 1 M KOH,respec-tively.When used as bifunctional electrodes for overall water splitting,it also shows low cell voltage of 1.60 V and 1.67 V at 10 and 20 mA cm-2,respectively.
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