| Ni-Co-LaNi5复合电极材料在碱性介质中的电催化析氢性能 |
| Electrocatalytic Behavior of the Codeposited Ni-Co-LaNi5 Coatings for Hydrogen Evolution in Alkaline Medium |
|
| 摘要: |
| 关键词: 复合电沉积 电催化 析氢 Ni-Co-LaNi5 |
| 基金项目: |
| Abstract: 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 ob-served 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 solu-tion. 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. |
| Keywords: electrolyte composite layers electrocatalysis hydrogen evolution Ni-Co-LaNi5 |
| |
| 摘要点击次数: 1597 |
| 全文下载次数: 2877 |
| 武 刚,李 宁,周德瑞.Ni-Co-LaNi5复合电极材料在碱性介质中的电催化析氢性能[J].无机化学学报,2003,19(7):739-744. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
