| 介孔调控Co9S8/Ni3S2复合电极材料及电催化析氢性能 |
| Mesoporous Regulated Co9S8/Ni3S2 Composite Electrode Materials and Electrocatalytic Hydrogen Evolution Performance |
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| 摘要: 利用快速凝固结合化学脱铝模板法制备前驱体纳米多孔Ni-Co合金，再经气相沉积硫和热氢还原制备纳米多孔Co9S8/Ni3S2复合电极材料。研究表明，通过气相沉积，硫原子与Ni-Co合金原位生成CoS2/NiS2复合相，再经过热氢还原后，形成硫原子比例较低的Co9S8/Ni3S2复合相。该热氢还原过程不仅提高了Co9S8/Ni3S2各元素周围的电子密度，而且在其表面调制出有介孔结构的异质界面，进而提高其电子传输能力并增大活性比表面积。相比于其他同条件下制备的Ni、Co硫化物，Co9S8/Ni3S2拥有更佳的析氢反应（HER）活性，在50 mA·cm-2的电流密度下，Co9S8/Ni3S2的HER过电位为234 mV，Tafel斜率为106 mV·dec-1，经稳定性测试后，电压变化仅为14 mV。 |
| 关键词: 纳米结构 复合电极 介孔结构 电化学 析氢反应 |
| 基金项目: 国家自然科学基金（No.51661018）资助。 |
| Abstract: The nano-porous Ni-Co alloy was prepared by rapid solidification and dealloying. After vapor deposition of sulfur and hot hydrogen reduction, nano-porous Co9S8/Ni3S2 composite electrode materials with surface mesoporous were prepared. The results showed that sulfur atoms and Ni-Co alloys formed CoS2/NiS2 composite phases in situ, and after thermal hydrogen reduction, Co9S8/Ni3S2 composite phase with a low sulfur atom ratio was formed. This thermal hydrogen reduction process not only increases the electron density around the Co9S8/Ni3S2 elements, but also modulates heterogeneous interface with mesoporous structure, which improves the electron transport capacity and increases the active surface area. Compared with other Ni and Co sulfides that were prepared under the same condition, Co9S8/Ni3S2 had better hydrogen evolution reaction (HER) activity. When current density was 50 mA·cm-2, the hydrogen evolution overpotential of Co9S8/Ni3S2 was 234 mV, and Tafel slope was 106 mV·dec-1. After stabilization test, the voltage changed only 14 mV. |
| Keywords: nano structure composite electrode mesoporous structure electrochemistry hydrogen evolution reaction |
| 投稿时间：2021-04-10 修订日期：2021-08-20 |
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| 周琦,黎新宝,焦孙治.介孔调控Co9S8/Ni3S2复合电极材料及电催化析氢性能[J].无机化学学报,2021,37(11):1970-1980. |
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