Fe-N-C materials are promising catalysts for the electroreduction of CO2 to CO,but they can achieve high CO selectivity only at relatively positive potentials and within a narrow potential window,which does not meet the requirement for the further reduction of CO in tandem catalysis.A novel γ-Fe2O3 hollow spheres dispersed on Fe-N-C materials are obtained through the pyrolysis of Fe(phen)3Cl2 crystals and ZIF-8.These materials are characterized by means of SEM,HR-TEM,XRD,XPS,etc.,and their performance are tested as the catalyst in electrocatalysis reduction of carbon dioxide.It is verified that the catalyst exhibits excellent CO selectivity with the faradaic efficiency(FECO)exceeding 97％over a broad potential window ranging from-0.5 V to-1.1 V vs.reversible hydrogen electrode.The catalyst can maintain its current density and FEco after the electrolysis has been performed at-0.6 V for 2 h,showing outstanding stability.
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