溢出增强了性电催化在富含接口的金属Pt支持的MoO3上的作用
Rajib Samanta1,2, Biplab Kumar Manna1,2, Ravi Trivedi3,4
1School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI Bhubaneswar Orissa 752050 India sbarman@niser.ac.in +91 6742494183.
Chemical science
|December 22, 2023
概括
这项研究引入了一种新的支持的三氧化电催化剂 (Pt/MoO3-CN-400),可显著增强氧化/进化反应 (HOR/HER) 在性介质中. 这一突破是由溢出驱动的,为燃料电池和电解器提供了具有成本效益的解决方案.
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:
- 对氧化/演化反应 (HOR/HER) 的高效电催化剂对于性燃料电池和电解剂至关重要.
- 在性介质中的HOR/HER动力学缓慢和高贵金属负载是商业化的主要障碍.
研究的目的:
- 开发一种高效,具有成本效益的电催化剂,减少HOR/HER的贵金属负载.
- 通过在支持的MoO3.3上使用溢出来研究增强HOR/HER活动的机制.
主要方法:
- 合成支持的MoO3 (Pt/MoO3-CN-400) 在20%的Pt负载下.
- 在性介质中对HER/HOR活性进行电化学表征.
- 实验和理论研究,包括工作功能和吸附能量的计算.
主要成果:
- 对于HER,Pt/MoO3-CN-400表现出较低的超电位 (66.8 mV) 和Tafel斜率 (41.2 mV dec-1).
- 催化剂显示出出色的HOR活性,其质量特定交换电流密度为505.7mA mgPt-1,超过商业Pt/C.
- 从Pt到MoO3地点的气溢出被确定为增强Volmer/Heyrovsky过程的关键机制.
结论:
- 在 Pt/MoO3 上的溢出显著增加了 HER/HOR 活性,因为它促进了 H2O 或 H2 解离和反应.
- Pt和MoO3之间的工作功能和结能量的差异支持溢出机制.
- 这项研究为设计用于可再生能源应用的先进溢出式电催化剂提供了宝贵的见解.
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