石墨烯结构对Pt/石墨烯催化剂的催化作用
Zhenzhen Du1,2, Fan Yu2, Jun Wang1,2
1AECC Beijing Institute of Aeronautical Materials Beijing 100095 China netfacn@163.com.
RSC advances
|July 17, 2024
概括
石墨烯支持增强质子交换膜燃料电池 (PEMFC) 催化剂,通过提高氧降解反应 (ORR) 活性和耐久性. 在多孔氧化减少石墨烯氧化物 (P-NRGO) 中的高含量是卓越的Pt/石墨烯催化剂性能的关键.
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:
- 支持的碳 (Pt/C) 催化剂是质子交换膜燃料电池 (PEMFC) 的理想选择,因为它们具有氧降解反应 (ORR) 活性.
- 碳黑在Pt/C催化剂中的支持氧化和腐蚀导致颗粒聚合,减少活性位点.
- 石墨烯支为增强催化剂稳定性和性能提供了一个有希望的替代碳黑.
研究的目的:
- 研究石墨烯支结构特征对ORR/石墨烯 (Pt/石墨烯) 催化剂的电催化性能的影响.
- 为PEMFCs的高性能Pt/石墨烯催化剂的合理设计提供指导.
主要方法:
- 制备四种类型的石墨烯支物:多孔配氧化减少石墨烯氧化物 (P-NRGO),配氧化减少石墨烯氧化物 (NRGO),处理的P-NRGO (TP-NRGO) 和减少石墨烯氧化物 (RGO).
- 关于和氧物种含量,特定表面积 (SSA) 和毛孔体积的支物的表征.
- 评估相应的Pt/石墨烯催化剂的ORR活性和耐用性.
主要成果:
- 催化剂的ORR活动顺序是Pt/P-NRGO > Pt/NRGO > Pt/TP-NRGO > Pt/RGO,基于半波潜力和峰值功率密度.
- 与商业Pt/C催化剂相比,Pt/P-NRGO在H2-空气PEMFC中表现出优越的长期耐用性.
- 在P-NRGO中高含量促进了Pt的均分散,并提供了可访问的活性点,从而导致了优异的ORR性能.
结论:
- 石墨烯支中的物种含量在确定ORR的Pt/石墨烯催化剂性能方面比SSA和孔径体积更为关键.
- 特定的表面积和 heteroatom dopants 显著影响 Pt 颗粒大小.
- P-NRGO是开发用于PEMFCs的先进Pt/石墨烯催化剂的高效支持材料.
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