通过通过相邻的单个铜站点进行轨道再混合来调节铁集群的电子结构,以有效减少氧气
Chunhong Qi1, Haoyu Yang2, Ziqi Sun2
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai, 201620, China.
引入相邻的铜--4单个原子 (Cu-N4 SAs) 显著提高氧降解反应 (ORR) 的铁原子集群 (Fe AC) 催化剂性能. 这种策略优化ORR动力学,提高催化剂效率.
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:
- 原子集群相互作用增强氧降解反应 (ORR) 的金属--碳催化剂.
- 合理的催化剂设计和理解ORR的结构-属性相关性仍然具有挑战性.
研究的目的:
- 调查相邻的金属 (M) -N4单个原子 (SAs) 对Fe原子集群 (AC) 催化剂ORR性能的影响.
- 阐明结构-属性相关性,管理增强的ORR活动.
主要方法:
- 密度函数理论 (DFT) 计算以建模原子集群相互作用和反应机制.
- 用Cu-N4 SAs修改的Fe AC催化剂在添加剂的半孔碳纳米片上的实验合成和表征.
- 在性和酸性介质中进行电化学测试,并评估空气电池的性能.
主要成果:
- DFT计算显示,Cu-N4 SAs调节O2吸附,O-O键裂解和OH*在Fe AC活性中心的中间释放.
- 合成的Fe AC + Cu-N4 SA催化剂表现出极好的ORR性能,半波电位为0.92V () 和0.80V (酸).
- 催化剂在空气电池中实现了214.8mW cm-2的高功率密度.
结论:
- 邻近的Cu-N4 SAs通过优化催化中心,有效地增强Fe AC催化剂的ORR活性.
- 该研究提出了一种用于调整原子分散多金属中心的新策略,用于先进的电催化.
- 这种方法为开发用于能源转换应用的高性能催化剂提供了巨大的潜力.
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