在MoS2上Pt的相位依赖增长为高效的H2进化
Zhenyu Shi1,2, Xiao Zhang3, Xiaoqian Lin4
1Department of Chemistry, City University of Hong Kong, Hong Kong, China.
Nature
|September 13, 2023
概括
二维二硫化 (MoS2) 纳米板的晶体阶段影响 (Pt) 纳米粒子的生长. 一个T
科学领域:
- 材料科学
- 纳米技术
- 催化剂
背景情况:
- 二维过渡金属二甲基化物 (TMD) 对于纳米材料合成和催化是至关重要的.
- TMD 的晶体阶段对其特性和支材料的生长有重大影响.
- 了解TMD晶相效应对于开发先进的催化剂至关重要,特别是对于演化反应.
研究的目的:
- 研究二硫化物 (MoS2) 纳米板的不同晶体相如何影响 (Pt) 纳米颗粒的生长和分散.
- 评估支持在相纯MoS2上的Pt纳米颗粒的电催化性能,用于演化反应.
主要方法:
- 合成纯相2H和1T'二硫化物 (MoS2) 的纳米片.
- 在MoS2模板上沉积 (Pt) 纳米粒子和单个原子.
- 材料结构和组成的特征.
- 使用密度函数理论 (DFT) 计算和实验测量,对演变反应 (HER) 的活性和稳定性的电化学评估.
主要成果:
- 2H相MoS2模板促进Pt纳米颗粒的表层生长.
- 1T'-阶段MoS2支持高分散的单原子 (s-Pt),重量可达10%.
- 在酸性介质中,s-Pt/1T'-MoS2对HER具有很好的电催化活性,其质量活性为85±23A/mg,质量正常化交换电流密度为127A/mg.
- 在 s-Pt/1T'-MoS2 系统中,DFT 计算表明位于 Mo 原子之上的 Pt 原子具有最佳的吸附.
结论:
- 在控制Pt纳米结构形成和催化性能方面,MoS2的晶体相是关键的决定因素.
- 在1T'-MoS2上支持的单原子Pt在室温下表现出高效率和稳定性.
- 1T'-TMD显示为其他催化应用的多功能支持.
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