钛/石墨烯/镍-铁合金析氢电极的制备及其析氢性能  

Preparation and hydrogen evolution performance of titanium/reduced graphene oxide/nickel-iron alloy electrode

作　　者：闫巍[1] 余智勇[1] 李新杰[1] 郜时旺[1] 刘练波[1] 宋军杰[2] 

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]苏州竞立制氢设备有限公司,江苏苏州215168

出　　处：《电镀与涂饰》2017年第7期337-341,共5页Electroplating & Finishing

基　　金：基金项目:高效水电解制氢技术和电化学法处理工业有机废水的开发(CERI/TY-CA-004-15B)

摘　　要：通过两步恒电位电沉积法,即在钛基表面沉积石墨烯(RGO)后再电沉积镍-铁合金,制备了钛基石墨烯/镍-铁合金复合电极。通过测量不同条件下制备的Ti/RGO/Ni-Fe电极在1 mol/L NaOH溶液中的阴极极化曲线,探究了氧化石墨烯(GO)质量浓度、电沉积电位、电沉积时间等RGO电沉积参数对Ti/RGO/Ni-Fe电极析氢催化活性的影响,确定了恒电位电沉积RGO的最佳工条件艺为:GO质量浓度0.1 g/L,电沉积电位-1.3 V,时间60 s。在最优工艺条件下制备的Ti/RGO/Ni-Fe电极中镍和铁的质量分数约为1.0∶1.5,其在1 mol/L NaOH溶液中的析氢过电位为275 mV,比相同条件下制备的Ti/Ni-Fe电极降低了近20%,且具有更小的电荷转移电阻。证明石墨烯镀层的引入可以提高Ti/Ni-Fe电极的电催化活性。A titanium/reduced graphene oxide/nickel-iron alloy （Ti/RGO/Ni-Fe） composite electrode was prepared by two-step constant potential electrodeposition, that is electrodeposition of RGO on titanium substrate followed by electrodeposition of nickel-iron alloy. The effects of process parameters of RGO electrodeposition including mass concentration of graphene oxide （GO）, electrodeposition potential and time were studied through measuring the cathodic polarization curves in 1 mol/L NaOH solution at Ti/RGO/Ni-Fe composite electrodes. The optimal process conditions for constant electrodeposition of RGO were obtained as follows： GO 0.1 g/L, electrodeposition potential -1.3 V and time 60 s. The mass fraction ratio of nickel to iron in the Ti/RGO/Ni-Fe composite electrode obtained under the optimal conditions is 1.0：1.5. On the Ti/RGO/Ni-Fe composite electrode, the hydrogen evolution overpotential in 1 mol/L NaOH solution is 275 mV, ca.20% lower than that on Ti/Ni-Fe alloy electrode, and the charge transfer resistance is lower than that of the later, showing that the RGO coating takes a positive part in improving the electrocatalytic activity of Ti/Ni-Fe alloy electrode.

关 键 词：石墨烯 镍-铁合金 恒电位沉积 析氢 催化活性 

分 类 号：TQ153.2[化学工程—电化学工业]