没有贵金属的Fe-N/C催化剂,在和酸的条件下进行高效的氧降解反应
1Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
一种通过热解合成的新型铁协调催化剂在和酸条件下表现出极好的氧降解反应 (ORR) 活性,在耐用性和甲醇耐受性方面表现优于/碳 (Pt/C).
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:
- 开发用于氧降解反应 (ORR) 的非贵金属催化剂对于推进能源技术至关重要.
- 铁和共的碳材料是有前途的ORR催化剂,但在酸性和性介质中实现高活性仍然是一个挑战.
研究的目的:
- 合成和评估一种新的非贵金属催化剂,用于氧减少反应 (ORR).
- 为了研究催化剂在性和酸性电解质中的性能,并将其与基催化剂进行比较.
主要方法:
- 使用11,11'-bis(dipyrido[3,2-a:2',3'-c]phenazinyl) (bidppz) 连接物合成一个富含的铁协调协调聚合物 (Fe-bidppz).
- 在800°C下对Fe-bidppz复合物的热解,以产生Fe-N/C-800催化剂.
- 在0.1M KOH和0.1M HClO4.4中对催化剂的ORR活性,耐久性和甲醇耐受性的电化学表征.
主要成果:
- 烧化催化剂 (Fe-N/C-800) 呈现出高ORR活性,其起始电位为923mV (性) 和809mV (酸性),与Pt/C相比较.
- 与Pt/C相比,Fe-N/C-800表现出优越的耐用性和甲醇耐受性.
- 电化学分析表明,Fe-N/C-800催化剂上的ORR具有有效的四电子转移通路.
结论:
- 铁-N/C-800催化剂,来自铁协调复合物的热解,是一种高度活跃和稳定的非贵金属ORR催化剂.
- 这种催化剂在燃料电池和其他电化学能量转换装置中的应用具有显著的潜力.
- 尽管表面积适度,但活性位点的密度很高,这有助于催化剂的异常性能.
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