石-乳酸框架的结构描述是Fe-N-C催化剂活动的关键
Vanessa Armel1, Sheena Hindocha2, Fabrice Salles1
1Institut Charles Gerhardt Montpellier, Laboratory for Aggregates, Interfaces and Materials for Energy, UMR 5253, CNRS, Université de Montpellier , 34095 Montpellier, France.
Journal of the American Chemical Society
|December 13, 2016
概括
研究人员发现,硫化化基框架 (ZIF) 的腔体大小和孔径量直接影响氧降解反应的铁--碳 (Fe-N-C) 催化剂的性能. 这一发现有助于设计更好的燃料电池和电池催化剂.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 活性和负担得起的氧降低催化剂对于提升聚合物电解质燃料电池和金属空气电池至关重要.
- 铁--碳 (Fe-N-C) 材料来源于地质化模酸框架 (ZIF) 是有前途的,但牺牲前体的合理设计是具有挑战性的.
研究的目的:
- 调查原始ZIF与导致氧降低的Fe-N-C催化剂活性之间的结构特性关系.
- 确定ZIF前体的关键特性,以提高Fe-N-C氧降解反应 (ORR) 催化剂的性能.
主要方法:
- 使用各种ZIF结构作为牺牲模板的Fe-N-C催化剂的 Pyrolytic制备.
- 在酸性电解质中评估ORR活性.
- 对ZIF特性 (腔体大小,毛孔体积,配体化学) 和催化剂性能之间的相关性分析.
主要成果:
- Fe-N-C催化剂的氧降解活性与前体ZIF的腔体大小和质量特异性孔体积具有正相关性.
- 来自ZIF-8的Fe-N-C催化剂具有高活性,这可以通过其结构性质进行合理化.
- 鉴定出一种不同的ZIF结构,产生更高的ORR活性;关联体化学影响最小.
结论:
- 这些发现为设计高级Fe-N-C催化剂的新型牺牲ZIF和多孔金属有机框架建立了关键的结构-属性关系.
- 这项研究有助于开发更高效,更便宜的金属碳催化剂,用于燃料电池和电池等能源应用.
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