揭示有机硫源对合成MoS2阶段和电催化进化性能的影响
Jiaqi Liu1, Jing Wang2, Baoqiang Wei2
1Yan'an Quality and Technical Inspection Institute, Yan'an 716000, China.
Inorganic chemistry
|June 10, 2023
概括
研究人员发现,有机硫源的分解温度控制了二硫化 (MoS) 的相位. 较低的分解温度产生金属MoS,提高其演化反应 (HER) 的性能.
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
- 催化剂是一种催化剂.
背景情况:
- 金属相二硫化物 (MoS2) 显示出对演化反应 (HER) 的有前途的电催化活性,与相似.
- 金属相MoS2的可控合成仍然是一个重大挑战,原因是不清楚的阶段决定因素.
研究的目的:
- 研究不同有机硫源对MoS2的相位和电催化性能的影响.
- 在合成过程中确定控制金属MoS2形成的关键因素.
主要方法:
- 使用 thioacetamide (TAA),l-cysteine 和 thiourea 作为有机硫源合成 MoS.
- MoS2阶段和形态的表征.
- HER性能的电催化评价,包括超电位和Tafel斜率测量.
主要成果:
- 乙胺和l-氨酸产生金属MoS,而氨酸产生半导体MoS.
- 与TAA合成的MoS2表现出优异的HER活性 (210 mV超电位在10 mA/cm2,44 mV/十年的Tafel斜率).
- 硫前体的较低分解温度被确定为稳定金属相并实现较小的MoS2大小的关键因素.
结论:
- 有机硫前体的分解温度是控制MoS2相形成的关键.
- 定制硫前体可使金属MoS的合成具有增强的电催化HER活性.
- 这些发现为设计高效的MoS2基电催化剂提供了关键的见解.
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