| 片状NiWP@多面体NiWO电催化剂的制备及其析氢性能 |
| Preparation of Plate NiWP@Polyhedral NiWO Electrocatalyst for Hydrogen Evolution |
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| 摘要: 采用水热法在泡沫镍上制备多面体镍钨氧化物(NiWO)前驱体，然后在不同温度下对前驱体进行磷化处理，获得片状镍钨磷化物(NiWP)@多面体NiWO复合电催化剂。结果表明：优化磷化温度可显著改善片状NiWP@多面体NiWO电催化析氢性能。当磷化温度为450℃时，所得电极具有较好的析氢催化活性，在1 mol·L-1 KOH中仅需115 mV的过电位就能达到10 mA·cm-2的电流密度，Tafel斜率为85 mV·dec-1，与铂片的Tafel斜率相近。此外，24 h长期稳定性测试结果表明该电催化剂具有良好的稳定性。优异的性能可归因于片状NiWP@多面体NiWO复合结构增大了催化活性面积，减小了电荷/质量传输阻力，使得析氢反应中电子转移速度加快，反应动力学性能提高。 |
| 关键词: 镍钨氧化物 磷化温度 镍钨磷化物 复合结构 电催化剂 |
| 基金项目: 国家自然科学基金项目(No.22075290)资助。 |
| Abstract: Here, polyhedral nickel-tungsten oxide (NiWO) precursor was prepared on nickel foam via the one-step hydrothermal method, and then it was phosphatized at different temperatures to obtain the plate nickel-tungsten phosphide (NiWP)@polyhedral NiWO composite electrocatalyst. The results showed that optimizing phosphating temperature can significantly improve the electrocatalytic hydrogen evolution performance of the plate NiWP@polyhedron NiWO. When the phosphating temperature was 450℃, it exhibited excellent hydrogen evolution catalytic activity with an overpotential of 115 mV to achieve 10 mA·cm-2. The Tafel slope was 85 mV·dec-1, which was similar to Pt. In addition, the 24 h long-term stability test showed that the electrocatalyst had good stability. This excellent performance can be attributed to the fact that the plate NiWP@polyhedral NiWO composite structure increases the catalytic active area, reduces the charge/mass transfer resistance, accelerates the electron transfer rate, and increases the reaction kinetics performance. |
| Keywords: nickel-tungsten oxide phosphating temperature nickel-tungsten phosphide composite structure electrocatalyst |
| 投稿时间：2021-12-08 修订日期：2022-05-11 |
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| 郭亚奇,范爱玲,庞伟,谢登奎,高殿超.片状NiWP@多面体NiWO电催化剂的制备及其析氢性能[J].无机化学学报,2022,38(7):1283-1290. |
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