(廊坊師范學院 化學與材料科學學院， 廊坊 065000)
摘 要: 用恒電流復合電沉積方法制備(Ni-W-P)-TiO2復合電極，, 討論TiO2懸浮量和電沉積時間對電極催化析氫性能的影響。采用SEM和XRD對電極的表面形貌和晶體結(jié)構(gòu)進行分析，以穩(wěn)態(tài)極化曲線對電極的催化析氫特性進行評價，并推測其反應機理。結(jié)果表明：(Ni-W-P)-TiO2電極是納米TiO2粒子相和納米晶Ni-W-P固溶體相構(gòu)成的復合電極，具有較高的催化析氫活性；在25 ℃、0.5 mol/L H2SO4介質(zhì)中(Ni-W-P)-TiO2電極的表觀交換電流密度是Ni-W-P合金電極的2.7倍，是Ni電極的53倍；當電流密度為100 mA/cm2時，該電極電勢相對于Ni-W-P電極正移了176 mV，相對于Ni電極正移了 581 mV；(Ni-W-P)-TiO2復合電極催化活性的提高主要源于反應機理的改變，復合電極表面的TiO2納米粒子與Ni-W-P合金具有明顯的電子協(xié)同效應。
關鍵字: (Ni-W-P)-TiO2電極；Ni-W-P電極；Ni電極；復合電沉積；電催化；析氫
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
