电沉积Ni-Fe-P非晶合金析氢阴极材料及其去合金化处理  

Electrodeposited Ni-Fe-P Amorphous Alloy as Cathode Material for Hydrogen Evolution and Its De-alloying Treatment

作　　者：司迎迎 任亚东 赵永强 闫叶祥 谢广文[1] 王桂雪[1] 刘欣[1] SI Ying-ying;REN Ya-dong;ZHAO Yong-qiang;YAN Ye-xiang;XIE Guang-wen;WANG Gui-xue;LIU Xin(Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学,山东青岛266042

出　　处：《表面技术》2020年第9期175-181,共7页Surface Technology

基　　金：国家自然科学基金(51672145)。

摘　　要：目的提高Fe电极的催化析氢性能。方法较低温度条件下,在Fe基体表面电沉积一层非晶态Ni-Fe-P镀层,探究沉积电流密度、去合金时间等参数对Ni-Fe-P/Fe电极在碱性电解质中的电催化析氢反应的影响。通过扫描电镜、能谱、X射线衍射对镀层的形貌、元素分布、物相进行分析。在碱性溶液中,利用电化学工作站对电极进行一系列性能测试。结果在沉积温度为10℃的条件下,于Fe电极表面成功制备出了致密且元素分布均匀的Ni-Fe-P非晶合金镀层。获得的Ni-Fe-P/Fe电极电催化性能均优于Fe电极,其中电流密度30 mA/cm^2条件下制备的Ni-Fe-P/Fe电极在析氢电流密度为10 mA/cm^2时的过电位为174.2 mV,比Fe电极低约466.2 mV。在相同条件下制备的Ni-Fe-P/Fe电极,经240 s去合金化处理,电极过电位仅为121.6 mV,比Fe电极低约518.8 mV。结论电沉积的Ni-Fe-P非晶合金镀层可以显著提高Fe电极的析氢性能。随着沉积电流密度的增加,Ni-Fe-P/Fe电极的析氢过电位减小,双电层电容和电化学工作表面积增大。对镀层进行适当的去合金化处理,形成的三维多孔结构可以减小电极的电荷转移电阻,有效降低电极的析氢过电位。The work aims to improve the catalytic hydrogen evolution of Fe electrode.The amorphous Ni-Fe-P coatings were electrodeposited on the surface of Fe substrate at a lower temperature.The effects of electrodeposition current density and de-alloying time on the Ni-Fe-P/Fe electrode in alkaline electrolyte were investigated.The morphology,element distribution and phase structure of the coatings were analyzed by scanning electron microscopy,energy dispersive spectroscopy,and X-ray diffraction.A series of performance tests were carried out on the electrode by electrochemical workstation in alkaline solution.The Ni-Fe-P amorphous alloy coating with dense and uniform element distribution was successfully prepared on the surface of Fe electrode at 10℃.The electrocatalytic performance of the obtained Ni-Fe-P/Fe electrodes was better than that of the Fe electrode.The overpotential of the Ni-Fe-P/Fe electrode prepared under the condition of J=30 mA/cm^2 at a hydrogen evolution current density of 10 mA/cm^2 was 174.2 mV,about 466.2 mV lower than that of the Fe electrode.For the Ni-Fe-P/Fe electrode prepared under the same conditions,after 240 s de-alloying treatment,the overpotential of the electrode was only 121.6 mV,about 518.8 mV lower than that of the Fe electrode.The electrodeposited Ni-Fe-P amorphous alloy coating can significantly improve the hydrogen evolution performance of the Fe electrode.With the increase of the deposition current density,the hydrogen evolution overpotential of the Ni-Fe-P/Fe electrode decreases,and the electric double layer capacitance and the electrochemical working surface area increase.After proper de-alloying of the electrode,the three-dimensional porous structure formed can reduce the charge transfer resistance of the electrode and the hydrogen evolution overpotential of the electrode.

关 键 词：电沉积 低温 去合金化 Ni-Fe-P镀层 析氢性能 碱性溶液 

分 类 号：TG139[一般工业技术—材料科学与工程] TQ153[金属学及工艺—合金]