单对称Fe-N4位点,通过化学蒸汽修饰使长久的质子交换膜燃料电池阴极成为可能
Jingsen Bai1,2, Tuo Zhao3, Mingjun Xu1,2
1State Key Laboratory of Electroanalytic Chemistry, Jilin Province Key Laboratory of Low Carbon Chemistry Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Nature communications
|May 17, 2024
概括
这项研究通过修改活性点和碳结构,提高了燃料电池的金属--碳电催化剂的耐用性. 新的催化剂显示出特殊的稳定性,克服了漏问题,并在扩展测试中保持性能.
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:
- 金属--碳电催化剂的有限耐用性阻碍了质子交换膜燃料电池 (PEMFC) 应用.
- 氧降解反应 (ORR) 的稳定性是一个关键的挑战,因为活动部位的浸出和降解.
研究的目的:
- 为了提高金属--碳电催化剂的耐用性,用于减少氧的反应.
- 开发一个稳定的活跃站点配置,并改进碳支持的石墨化.
主要方法:
- 化学蒸汽修饰被用于将FeN4活性部位转化为FeN2+N'2.2.
- 碳基板的石墨化程度得到了增强.
- 进行了加速老化测试和燃料电池运行条件模拟.
主要成果:
- 经过修改的电催化剂表现出极好的耐用性,在20万个潜在循环后,半波潜力下降值可以忽略不计.
- 在燃料电池运行条件下实现了超过248小时的稳定性能.
- FeN2+N'2活性位点有效地防止了由质子化和激素攻击引起的Fe漏.
结论:
- 新型活性部位配置和增强的碳基板显著提高了电催化剂的耐用性.
- 这一进步为PEMFCs中的金属--碳电催化剂的实际应用提供了宝贵的见解.
- 开发的催化剂解决了关键的降解途径,为更强大的燃料电池技术铺平了道路.
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