高的PtRhNiFeCu合金纳米催化剂的协同效应,用于进化和氧减少反应
Zhiwei Hu1, Kuangyin Chen1, Yihua Zhu1
1Shanghai Engineering Research Centre of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
这项研究引入了超小的高合金 (HEA) 纳米颗粒作为进化和氧减少反应的双催化剂. 新型PtRhNiFeCu HEA催化剂在性和酸性条件下表现出卓越的性能和稳定性.
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:
- 高合金 (HEAs) 由于晶格扭曲和多组件协同作用,具有独特的催化性能.
- 开发用于演变反应 (HER) 和氧减少反应 (ORR) 的多功能催化剂对于能源应用至关重要.
研究的目的:
- 为了研究超小的PtRhNiFeCu HEA纳米颗粒对HER和ORR的催化性能.
- 了解有助于增强催化活性的潜在机制.
主要方法:
- 合成超微小的PtRhNiFeCu HEA纳米粒子.
- 在性和酸性介质 (HER和ORR) 中进行电化学表征.
- 密度函数理论 (DFT) 计算分析电子结构和反应机制.
主要成果:
- PtRhNiFeCu HEA催化剂在性介质中表现出优异的 HER 活性 (13 mV 超电位, 29.6 mV dec−1 Tafel 斜率, 7.6 A mgPt−1 质量活性) 和稳定性 (>20 h).
- 催化剂还在酸性介质中显示出强烈的ORR活性 (1.23 A mgPt-1),表现优于商业Pt/C.
- DFT计算揭示了优化电子结构的协同效应,增强HER的水解离,并为ORR创建活跃站点.
结论:
- 超小的PtRhNiFeCu HEA纳米粒子是HER和ORR的高效多功能电催化剂.
- 在HEA结构中的协同电子效应是实现卓越的催化性能和稳定性的关键.
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