引用本文:
黄令, 杨防阻, 许书楷, 周绍民. 纳米晶Ni-Mo-Co合金镀层的结构与析氢行为[J]. 应用化学,
2001, 18(10): 768-771.
Citation: HUANG Ling, YANG Fang-Zu, XU Shu-Kai, ZHOU Shao-Min. Structure of Nanocrystalline Ni-Mo-Co Alloy and Electrocatalytic Hydrogen Evolution on Electrode Thereof[J]. Chinese Journal of Applied Chemistry, 2001, 18(10): 768-771.
Citation: HUANG Ling, YANG Fang-Zu, XU Shu-Kai, ZHOU Shao-Min. Structure of Nanocrystalline Ni-Mo-Co Alloy and Electrocatalytic Hydrogen Evolution on Electrode Thereof[J]. Chinese Journal of Applied Chemistry, 2001, 18(10): 768-771.
纳米晶Ni-Mo-Co合金镀层的结构与析氢行为
摘要:
用电沉积方法制备了纳米Ni-Mo-Co合金沉积层,用XRD、XPS方法对沉积层的结构进行了表征,结果表明,Ni-Mo-Co合金出现较大的晶格畸变,纳米合金各物种的结合能发生不同程度的位移.在30%的KOH溶液中的阴极极化曲线表明,Ni-Mo-Co合金电极具有良好的析氢电催化活性.电化学的交流阻抗谱表明,低过电位时该合金电极上析氢过程为Volmer-Tafel机理,即吸附态的氢经化学脱附形成氢气,速率决定步骤是Volmer反应;在较高过电位时析氢反应表现为Volmer-Heyrovsky机理,即吸附态的氢经电化学脱附形成氢气.
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关键词:
- 电沉积
- / 纳米晶Ni-Mo-Co合金
- / 结构
- / 析氢反应
English
Structure of Nanocrystalline Ni-Mo-Co Alloy and Electrocatalytic Hydrogen Evolution on Electrode Thereof
Abstract:
The nanocrystalline nickel-molybdenum-cobalt alloy deposits were obtained by electrodeposition method. The structures of the deposits were analyzed by XRD and XPS; considerable lattice deformation in alloy occured and only one diffraction peak was recorded on XRD spectrum. The XPS results of nanocrystalline Ni-Mo-Co deposit indicated that the nickel and molybdenum and cobalt coexist in metal state of the deposits, with binding energy being increased in some extent. The nanocrystalline Ni-Mo-Co alloy deposit electrode offered better electrocatalytic hydrogen evolution than nanocrystalline Ni Mo alloy electrode. The electrochemical impedance spectra of the nanocrystalline Ni-Mo-Co alloy electrode indicated that hydrogen evolution in 30%(m/m) KOH follows Volmer-Tafel mechanism at lower potential, but at higher potential it follows Volmer Heyrovsky mechanism.
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Key words:
- nanocrystalline Ni-Mo-Co alloy
- / electrodeposition
- / structure
- / hydrogen evolution
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