【摘 要】
：
Surface oxidized iron-nickel nanorods coupling with reduced graphene architectures (FeNi-O-rGA) are successfully constructed via hydrothermal,freeze-drying,and thermal activation approaches.The hierarchical structure can provide lots of pathways for fast
【机 构】
：
School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225000,China
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Surface oxidized iron-nickel nanorods coupling with reduced graphene architectures (FeNi-O-rGA) are successfully constructed via hydrothermal,freeze-drying,and thermal activation approaches.The hierarchical structure can provide lots of pathways for fast ion diffusion and charge transfer,and expose abundant catalytic sites.Meanwhile,the activity of FeNi-O-rGA is boosted by the optimized metal-oxygen bond strength in FeNi3 alloys.Partial oxidized FeNi nanorods are strongly coupled with rGA by the formation of metal-O-C bonds,which can impede the aggregation of FeNi3 alloys and increase the utilization of active sites.The special structure and partially oxidized FeNi nanorods for FeNi-O-rGA can result in excellent OER activity and catalytic stability.Only 215 mV of overpotential is required to drive the current density of 10 rnA/cm2 as well as the Tafel slope of 50.9 mY/dec in 1 mol/L KOH.The change of surface chemistry of FeNi-O-rGA is confirmed by XPS after the OER test,which indicates the highly catalytic stability of FeNi-O-rGA due to the formation of intermediate metal oxyhydroxide.
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