(廊坊师范学院 化学与材料科学学院， 廊坊 065000)
摘 要: 用恒电流复合电沉积方法制备(Ni-W-P)-TiO2复合电极，, 讨论TiO2悬浮量和电沉积时间对电极催化析氢性能的影响。采用SEM和XRD对电极的表面形貌和晶体结构进行分析，以稳态极化曲线对电极的催化析氢特性进行评价，并推测其反应机理。结果表明：(Ni-W-P)-TiO2电极是纳米TiO2粒子相和纳米晶Ni-W-P固溶体相构成的复合电极，具有较高的催化析氢活性；在25 ℃、0.5 mol/L H2SO4介质中(Ni-W-P)-TiO2电极的表观交换电流密度是Ni-W-P合金电极的2.7倍，是Ni电极的53倍；当电流密度为100 mA/cm2时，该电极电势相对于Ni-W-P电极正移了176 mV，相对于Ni电极正移了 581 mV；(Ni-W-P)-TiO2复合电极催化活性的提高主要源于反应机理的改变，复合电极表面的TiO2纳米粒子与Ni-W-P合金具有明显的电子协同效应。
关键字: (Ni-W-P)-TiO2电极；Ni-W-P电极；Ni电极；复合电沉积；电催化；析氢
as electrode materials prepared by electrolytic co-deposition
（Faculty of Chemistry and Material Science, Langfang Teachers College, Langfang 065000, China）
Abstract:(Ni-W-P)-TiO2 composite coating used as electrode materials was prepared by electrolytic co-deposition at constant current. The effects of concentration of TiO2 particles suspended in the plating bath and depositing time on the catalytic activity of the electrode for the hydrogen evolution reaction (HER) were discussed. The surface morphology and phase structure of (Ni-W-P)-TiO2 coating were observed by SEM and XRD. The catalytic activity of the HER was evaluated on the basis of electrochemical steady-state polarization curves. And the reaction mechanism was presumed. The results show that the (Ni-W-P)-TiO2 electrode consists of TiO2 crystalline and Ni-W-P nano crystalline in solid solution. The composite electrode is catalytically more active than Ni-W-P or Ni alloy electrode. The apparent exchange current density of the composite electrode in 0.5 mol/L H2SO4 solution is 2.7 times that of the Ni-W-P electrode, and 53 times that of Ni electrode at 25 ℃. The polarization overpotential for hydrogen evolution of the (Ni-W-P)-TiO2 electrode is 176 mV lower than that of Ni-W-P electrode and is 581 mV lower than that of Ni electrode at the current density of 100 mA/cm2. The increased catalytic activity for the HER of the (Ni-W-P)-TiO2 composite electrode is mainly due to the change in the reaction mechanism caused by the synergistic electronic effect of the Ni-W-P alloy and the TiO2 nano particles on the electrode surface.
Key words: (Ni-W-P)-TiO2 electrode; Ni-W-P electrode; Ni electrode; composite electroplating; electrocatalysis; hydrogen evolution
