为可持续的生产量身定制铜单原子稳定型金属稳定型过渡型金属二原体
Lixin Yi1, Kunkun Nie1, Binjie Li1
1Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, 710129, China.
Angewandte Chemie (International ed. in English)
|September 14, 2024
概括
使用可扩展的蚀刻方法创建了稳定的1T'阶段过渡金属二甲基化物 (TMD) 空洞结构. 这些材料表现出增强的演化反应 (HER) 性能和长期稳定性,这是由于铜单个原子的相位稳定.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术 纳米技术
背景情况:
- 非传统的1T'相过渡金属二甲基化物 (TMDs) 对演变反应 (HER) 催化具有前景.
- 1T'阶段的固有不稳定性,往往会回到不活跃的2H阶段,限制了它们的催化活性和耐用性.
- 开发提高1T'-TMD热稳定性和相稳定性的策略对于实际应用至关重要.
研究的目的:
- 开发一种可扩展的方法来合成热稳定的1T'-TMD空心结构 (HS).
- 研究铜单个原子 (SAs) 在稳定1T'阶段和增强HER性能方面的作用.
- 为了证明制造的1T'-TMD HSs的长期催化稳定性.
主要方法:
- 合成Cu1.94S@TMDs异构结构,然后对Cu1.94S模板进行蚀刻,以形成1T'-TMD HSs.
- 合成材料的表征,包括结构和相位分析.
- 电化学评估HER性能和相位过渡温度的确定.
主要成果:
- 成功制造了热稳定的1T'-MoS,MoSe,WS和WSeHSs.
- 在1T'-MoS2HSs上吸附的铜SAS显著增加了相位过渡温度,从149°C增加到373°C.
- 制造的1T'-MoS2 HSs表现出优越的HER性能,并在高电流密度下保持超过200小时的活性.
结论:
- 开发的蚀刻方法为高度稳定的1T'-TMD电催化剂提供了通用途径.
- 铜SA装饰有效地提高了1T'-TMD的相稳定性,从而提高了催化性能和耐用性.
- 这项工作突出了基于TMD的HER电催化剂中相稳定性和催化效率之间的关键关系.
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