作为性燃料电池的ORR电催化剂的原子分散 Zn/Co-N-C
Weixuan Xu1, Rui Zeng1, Michael Rebarchik2
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.
Journal of the American Chemical Society
|January 18, 2024
概括
研究人员为燃料电池开发了先进的双金属单原子催化剂 (SAC). 这些非珍贵的Zn/Co-N-C催化剂显示出高活性和耐久性,可促进氧降解反应 (ORR),提高燃料电池的性能.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 燃料电池对于可持续能源至关重要,但需要高效的氧降解反应 (ORR) 电催化剂.
- 开发低成本,耐用和高性能非贵金属催化剂对于推进燃料电池技术至关重要.
研究的目的:
- 设计和合成新的金属-有机框架衍生双金属单原子催化剂 (SAC) 以改善ORR动力学.
- 调查性燃料电池中的Zn/Co-N-C SAC的催化机制和活性位点.
主要方法:
- 金属有机框架衍生的Zn/Co-N-C单原子催化剂的合成.
- 电化学特性,包括半波电位和稳定性测试.
- 操作X射线吸收光谱和理论计算 (微动力学建模,核心水平转移) 以获得机械洞察力.
主要成果:
- Zn/Co-N-C SAC 显示出优异的 ORR 活性 (E1/2 = 0.938 V 与 RHE 相比) 和优异的稳定性 (ΔE1/2 = -8.5 mV 在 50k 循环后).
- 在性燃料电池中达到~1W cm-2的最高功率密度.
- 在ORR过程中确定了Co-N4作为主要活性位点,氧结合形成Oads-Co-N4部分,得到实验和理论数据的支持.
结论:
- 这项研究提出了ORR的高性能,非贵金属双原子催化剂.
- 提供了对活性部位和催化过程的全面机制理解.
- 为燃料电池和其他能源应用设计先进的单位电催化剂铺平了道路.
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