通过在Ru/WC1-x接口上促进基吸附,提高Ru单原子的性氧化活性
Jinkyu Park1, Honghui Kim1, Seongbeen Kim1
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Daejeon, 34141, Republic of Korea.
在性介质中开发单原子催化剂 (SAC) 进行氧化反应 (HOR) 对燃料电池至关重要. 这项研究报告了一种新型的碳化物支持的SAC,可显著增强HOR活性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 在性条件下,缓慢的氧化反应 (HOR) 动力学阻碍了离子交换膜燃料电池 (AEMFC) 的实施.
- 单原子催化剂 (SAC) 提供了高活性和成本效益的HOR催化剂的潜力,但它们对性HOR的设计需要进一步研究.
- 目前对性HOR的SAC的研究有限,需要对合理设计原则进行根本性研究.
研究的目的:
- 设计和合成一种新的单原子催化剂,以提高性氧化反应 (HOR) 的性能.
- 调查负责设计的单原子催化剂提高HOR活性的基本机制.
- 为性HOR应用提供有关高活性单原子催化剂的合理设计的见解.
主要方法:
- 在碳化物 (Ru SA/WC1-x) 上支持的单原子催化剂的合成,使用现场高温回火策略.
- 在性介质中评估HOR性能的电化学表征.
- 密度函数理论 (DFT) 计算以阐明催化机制和支效应.
主要成果:
- 与碳支持的Ru SAC相比,Ru SA/WC1-x催化剂在性介质中显著增强了HOR活性.
- 电化学和DFT结果表明,由于支持的零电荷潜力较低,Ru SA/WC1-x接口的增强基吸附是提高HOR性能的关键.
- Ru SA/WC1-x表现出分别比碳上的Ru纳米粒子和N-化碳上的Ru单原子高5.8倍和60.1倍的Ru质活性.
结论:
- 开发的Ru SA/WC1-x催化剂在性HOR的SAC方面取得了重大进展.
- 该研究强调了支性质的关键作用,特别是零电荷的潜力,在为性HOR设计有效的SAC方面发挥了关键作用.
- 这项工作为下一代燃料电池应用的高活性单原子催化剂的合理设计提供了宝贵的见解.
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