石墨烯负载的S掺杂NiFe LDH材料的制备及电催化性能

Preparation and Electrocatalytic Properties of Graphene-supported S-doped NiFe LDH

采用了CVD、水热法及室温硫化制备了石墨烯负载的S掺杂NiFe LDH电催化剂(NFG@NiFe-S LDH)。利用XRD、SEM、Raman、BET、EPR和Gamry电化学工作站对材料的结构和电化学性能进行研究,探究了复合石墨烯以及S掺杂对材料及电化学性能的影响。结果表明,与石墨烯复合极大提高了材料的导电性,S掺杂使得材料中出现更多缺陷,调节了材料电子结构,促进电子转移,从而提高了材料的催化活性。尤其是当硫化时间为2 h时,在电流密度为100 mA/cm^(2)时,OER过电位仅282 mV,塔菲尔斜率只有70.6 mV/dec。

Graphene-supported S-doped NiFe LDH electrocatalyst(NFG@NiFe-S LDH)was prepared by CVD,hydrothermal method and subsequent room temperature sulfurization process.The structure and electrochemical performance of the material were studied by XRD,SEM,Raman,BET,EPR and Gamry electrochemical workstation,exploring how do graphene and S doping effect the structure and electrochemical performance of the material.The results show that the composite with graphene greatly improves the conductivity of the material,and S doping introduces more defects into the material,that adjusts the electronic structure of the material and promotes electron transfer,thus improving the electrochemical activity of the material.Especially when the sulfurization time is 2 h,the OER overpotential is only 282 mV at 100 mA/cm^(2) of current density,and the tafel slope is 70.6 mV/dec.