Composite coatings of Ni Co LaNi5, prepared by electrolytic codepositon of Ni Co alloys and LaNi5 particles from a sulfamate electrolyte were investigated in view of its possible application as electrocatalytic materi...Composite coatings of Ni Co LaNi5, prepared by electrolytic codepositon of Ni Co alloys and LaNi5 particles from a sulfamate electrolyte were investigated in view of its possible application as electrocatalytic materials for the hydrogen evolution reaction(HER). The surface morphology and microstructure of Ni Co LaNi5 coatings were observed by means of SEM and XRD. Electrocatalytic efficiency was evaluated on the basis of electrochemical steady state Tafel polarization and electrochemical impedance spectroscopy technology in 1mol· L- 1 NaOH solution. The results were compared with Ni Co and Ni electrodes. The real electrochemical area was estimated by apparent double layer capacitances to account for the large difference in roughness factor of the three surfaces. The values obtained for the apparent energy of activation were 32.48kJ· mol- 1,46.29kJ· mol- 1 and 57.03kJ· mol- 1 for the HER on the Ni Co LaNi5, Ni Co and Ni electrodes, respectively. The composite coatings Ni Co LaNi5 is catalytically more active than Ni and Ni Co electrodes due to the increase in its real surface areas and the decrease in the apparent energy of activation caused by electrocatalytic synergistic effect of the Ni Co alloy and the rare earth compound on the electrode surface.展开更多
用化学镀方法制备出Ni Co W P合金电极 ,测量了其在 1mol/LNaOH溶液中的阴极极化曲线并研究了其析氢电催化活性。试验表明 ,在相同的电流密度下 ,Ni Co P ,Ni W P和Ni Co W P合金电极的析氢过电位较Fe电极降低 ,其中Ni Co W P的析氢过...用化学镀方法制备出Ni Co W P合金电极 ,测量了其在 1mol/LNaOH溶液中的阴极极化曲线并研究了其析氢电催化活性。试验表明 ,在相同的电流密度下 ,Ni Co P ,Ni W P和Ni Co W P合金电极的析氢过电位较Fe电极降低 ,其中Ni Co W P的析氢过电位降低约 2 30mV ,XRD试验显示其镀层为非晶态。并进一步测试了其在 7mol/LKOH中的连续电解曲线。结果表明 :Ni Co W P合金电极比Ni Co P ,Ni W P合金电极具有更好的析氢电催化活性和电化学稳定性 ,有利于降低槽压 。展开更多
文摘Composite coatings of Ni Co LaNi5, prepared by electrolytic codepositon of Ni Co alloys and LaNi5 particles from a sulfamate electrolyte were investigated in view of its possible application as electrocatalytic materials for the hydrogen evolution reaction(HER). The surface morphology and microstructure of Ni Co LaNi5 coatings were observed by means of SEM and XRD. Electrocatalytic efficiency was evaluated on the basis of electrochemical steady state Tafel polarization and electrochemical impedance spectroscopy technology in 1mol· L- 1 NaOH solution. The results were compared with Ni Co and Ni electrodes. The real electrochemical area was estimated by apparent double layer capacitances to account for the large difference in roughness factor of the three surfaces. The values obtained for the apparent energy of activation were 32.48kJ· mol- 1,46.29kJ· mol- 1 and 57.03kJ· mol- 1 for the HER on the Ni Co LaNi5, Ni Co and Ni electrodes, respectively. The composite coatings Ni Co LaNi5 is catalytically more active than Ni and Ni Co electrodes due to the increase in its real surface areas and the decrease in the apparent energy of activation caused by electrocatalytic synergistic effect of the Ni Co alloy and the rare earth compound on the electrode surface.
文摘用化学镀方法制备出Ni Co W P合金电极 ,测量了其在 1mol/LNaOH溶液中的阴极极化曲线并研究了其析氢电催化活性。试验表明 ,在相同的电流密度下 ,Ni Co P ,Ni W P和Ni Co W P合金电极的析氢过电位较Fe电极降低 ,其中Ni Co W P的析氢过电位降低约 2 30mV ,XRD试验显示其镀层为非晶态。并进一步测试了其在 7mol/LKOH中的连续电解曲线。结果表明 :Ni Co W P合金电极比Ni Co P ,Ni W P合金电极具有更好的析氢电催化活性和电化学稳定性 ,有利于降低槽压 。
