化学蒸汽沉积到高效的双金属原子分散氧降低催化剂
Xudong Jia1, Bolong Yang1, Qian Cheng1
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Macromolecular rapid communications
|August 7, 2024
概括
一种新型的铁化碳电催化剂 (FeCo-N-C@U-AC) 为氧降解反应提供了与相比具有成本效益的替代品. 这种催化剂在酸性和性介质中表现出卓越的活性和耐用性,在燃料电池和电池中表现优于.
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:
- 非贵金属添加碳 (M-Nx/C) 催化剂是用于电化学反应的的有希望的替代品.
- 对于M-Nx/C催化剂的传统合成方法,它们的协同作用相互作用和活性部位封闭性很差,限制了效率和质量转移.
研究的目的:
- 开发一种使用化学蒸汽相沉积 (CVD) 的高活性和稳定的FeCo-N-C@U-AC电催化剂.
- 评估催化剂在氧降解反应 (ORR) 的性能及其在能量储存和转换装置中的应用.
主要方法:
- 通过化学蒸汽相沉积 (CVD) 合成FeCo-N-C@U-AC电催化剂.
- 在酸性 (0.1M HClO4) 和性 (0.1M KOH) 电解质中氧降解反应 (ORR) 催化剂的电化学表征.
- 催化剂的耐用性测试超过5万秒.
- 作为质子交换膜燃料电池 (PEMFC) 和气流电池 (ZAFB) 中的阴极催化剂的性能评估.
主要成果:
- FeCo-N-C@U-AC催化剂表现出高ORR活性,半波电位为0.820V (在HClO4) 和0.911V (在KOH).
- 观察到异常稳定性,在5万秒后保持93.25% (在HClO4) 和98.38% (在KOH) 的初始电流,超过Pt/C.
- 在能源设备中,催化剂达到859mW·cm−2 (PEMFCs) 和162mW·cm−2 (ZAFBs) 的峰值功率密度,相当于Pt/C.
结论:
- 通过CVD合成的FeCo-N-C@U-AC催化剂为基催化剂提供了一个高度活跃,稳定和具有成本效益的替代品.
- 催化剂的设计克服了传统方法的局限性,提供了增强的催化场暴露和质量转移.
- 这种FeCo-N-C@U-AC催化剂显示出在燃料电池和金属空气电池中实际应用的巨大潜力.
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