构建不对称的Fe-Nb二原子位点以提高ORR活动和耐用性
Rui Sui1, Bo Liu2, Chang Chen1
1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Journal of the American Chemical Society
|September 13, 2024
概括
在铁--碳 (Fe-N-C) 催化剂中引入 (Nb) 会产生稳定的Fe-Nb二原子位点,显著提高氧降解反应 (ORR) 的性能和耐用性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 无催化剂对于可持续能源技术至关重要.
- 铁--碳 (Fe-N-C) 材料对氧减少反应 (ORR) 是有前途的,但由于铁的不稳定性而受到影响.
- 提高Fe-N-C稳定性是它们实际应用的关键.
研究的目的:
- 合成和研究Fe-Nb二原子位点以改善ORR催化.
- 了解在稳定Fe位点和优化ORR动力学的作用.
- 评估空气电池和燃料电池中的Fe-Nb催化剂的性能.
主要方法:
- 不对称的Fe-Nb二原子位点催化剂 (FeNb/c-SNC) 的合成.
- 电化学描述ORR活动和稳定性.
- 在气电池 (ZAB) 和氧化物交换膜燃料电池 (HEMFC) 中进行测试.
主要成果:
- 与Fe单原子催化剂 (SAC) 相比,FeNb/c-SNC催化剂具有更高的ORR活性和稳定性.
- 这种Fe-Nb相互作用优化了中间溶解,并加强了Fe-N的结合,抑制了铁的脱金属化.
- 用FeNb/c-SNC供电的ZAB和HEMFC实现了高峰功率密度和显著延长的稳定运行时间.
结论:
- Fe-Nb二原子位点为开发高稳定性和活性的基于Fe的ORR催化剂提供了有前途的策略.
- 的加入有效地提高了Fe-N-C材料的耐用性.
- 这项工作为设计用于能量转换装置的先进原子级催化剂提供了洞察力.
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