组金属单原子合金催化剂的空间封闭合成
Yiming Zhu1, Wei-Hsiang Huang2,3, Xinyue Shi1
1Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
我们开发了一种新型的碳外金铁单原子合金 (SAA) 催化剂, 这种先进的催化剂在演化反应中表现出卓越的性能,为高效的水分裂提供了有前途的解决方案.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 质子交换膜水电解器 (PEMWE) 需要高效的阴极催化剂进行演变反应 (HER).
- 基于的单原子合金 (SAA) 催化剂提供高效率和低负载,但面临合成挑战.
- 开发可控制的SAA合成方法对于实际的PEMWE应用至关重要.
研究的目的:
- 报告成功制造碳封装的Pt-doped NiFe单原子合金 (C@Pt-NiFe SAA) 催化剂.
- 研究C@Pt-NiFeSAA的形成过程和催化性能.
- 展示基于各种白金组金属 (PGM) 的SAA合成的空间限制策略的潜力.
主要方法:
- 催化剂合成的空间限制策略.
- 酸演化反应 (HER) 活动测试.
- 操作式X射线吸收光谱 (XAS) 用于现场表征.
- 理论计算 (DFT) 以了解电子结构和反应机制.
主要成果:
- 通过空间限制方法成功合成了C@Pt-NiFeSAA催化剂.
- 与商业Pt/ C相比,C@Pt- NiFeSAA对HER的质量活动显著增加.
- 在PEMWE阴极中使用时,C@Pt-NiFeSAA的性能优于商业Pt/C.
- 运行的XAS和理论计算证实了低协调的Pt点是具有优化电子属性的活跃中心.
结论:
- 开发的C@Pt-NiFeSAA是PEMWE阴极的非常有前途的催化剂,其表现优异.
- 空间限制策略是生产各种基于PGM的SAA的多功能方法.
- 这项工作促进了水电解和电催化剂的高效和成本效益的开发.
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