由低负电子元素引起的竞争性吸附和应变调节,以改善HT-PEMFC中的酸盐耐受性
Ji Qiu1, Zhangyue Wei1, Siyu Wang1
1Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China.
Journal of colloid and interface science
|February 19, 2025
概括
我们为PtMn金属间电催化剂开发了一种新的活性碳支,可以减轻高温质子交换膜燃料电池 (HT-PEMFC) 中的酸中毒,增强氧降低反应动力学和燃料电池性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 高温质子交换膜燃料电池 (HT-PEMFC) 对于高效的能量转换至关重要.
- 在HT-PEMFC中含有的酸通过吸附到活性部位来毒害基于的阴极电催化剂,阻碍氧降解反应 (ORR) 动力学.
- 这种催化剂中毒是HT-PEMFC技术商业化的主要障碍.
研究的目的:
- 开发一种新的电催化剂,可以克服HT-PEMFC中酸中毒.
- 为了提高高温酸性环境的阴极电催化剂的活性和稳定性.
- 提高HT-PEMFCs的整体效率和可行性.
主要方法:
- 通过引入 (B) 来固金属间化合物集群,支持活性碳.
- 为PtMn金属间化合物设计了一个核心外结构.
- 研究了酸盐离子的竞争性吸附和催化剂的电子结构.
主要成果:
- 活性炭支通过竞争性吸附酸离子有效地减轻了酸中毒.
- PtMn/BC催化剂表现出增强的ORR活性,其E1/2值比80°C的商业Pt/C高53mV.
- 质量活动和特异性活动分别是商业Pt/C的5.2倍和2.6倍.
- 该HT-PEMFC实现了1108.3mWcm-2的最大功率密度,超过了商业Pt/C和大多数报告的ORR催化剂.
结论:
- 开发的PtMn/BC电催化剂在HT-PEMFC中表现出卓越的性能和稳定性.
- 激活和金属间核心外结构的战略有效地减轻了催化剂中毒.
- 这种催化剂显示了推进HT-PEMFC技术的巨大潜力.
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