论文部分内容阅读
目的制备催化析氢性能较好的复合电极。方法用电沉积法制备了(Ni-W-P)-TiO2复合镀层电极,并通过测定阴极极化曲线、塔菲尔曲线和交流阻抗对Ni、Ni-W-P和(Ni-W-P)-TiO2电极的催化性能进行了对比。结果温度为20℃时制得的(Ni-W-P)-TiO2电极催化性能最好;在电流密度j=100mA·cm-2时,电极比Ni电极电势高326mV,比Ni-W-P电极高105mV;25℃时(Ni-W-P)-TiO2电极的表观交换电流密度J0是NiW-P电极的1.42倍,是Ni电极的143倍,其表观活化能较Ni-W-P降低了11.54kJ·mol-1,电化学电阻Rt减小20Ω·cm-2。结论 (Ni-W-P)-TiO2电极的催化性能较好,可以作为廉价、高效的催化析氢材料。
Objective To prepare a composite electrode with better catalytic performance for hydrogen evolution. Methods (Ni-WP) -TiO2 composite electrode was prepared by electrodeposition. The catalytic activity of Ni-Ni-WP and (Ni-WP) -TiO2 electrode was measured by measuring cathodic polarization, Tafel curve and AC impedance Performance has been compared. Results The (Ni-WP) -TiO2 electrode prepared at the temperature of 20 ℃ had the best catalytic performance. When the current density was j = 100mA · cm-2, the electrode was 326mV higher than the Ni electrode and 105mV higher than the Ni-WP electrode. The apparent exchange current density J0 at 25 ℃ (Ni-WP) -TiO2 electrode is 1.42 times that of NiW-P electrode and 143 times that of Ni electrode. The apparent activation energy decreases by 11.54kJ · mol- 1, the electrochemical resistance Rt reduced 20Ω · cm-2. Conclusion The Ni-W-P-TiO 2 electrode has good catalytic performance and can be used as a cheap and efficient catalytic hydrogen evolution material.