在单原子催化剂中创建不对称的Fe-N3C-N位点可以提高氧降低反应的催化性能
Chao Xu1, Xuewen Li2, Peng-Peng Guo1
1Key Laboratory for Advanced Materials, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.
研究人员开发了一种新的单原子催化剂 (SAC),具有不对称的Fe-N3C-N位点,以改善氧降解反应 (ORR) 活性. 这种先进的催化剂提高了空气电池的性能,超过了商业催化剂的性能.
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:
- 优化单原子催化剂 (SAC) 用于氧降解反应 (ORR) 对能源技术至关重要.
- 调整金属站点协调环境是提高SAC催化活性的关键.
研究的目的:
- 设计和合成一个具有非对称Fe-N3C-N协调位点的新型SAC.
- 研究新SAC的ORR性能及其在空气电池中的应用.
主要方法:
- 合成Fe-N3C-N SAC通过铁异波氨酸在聚利胺醇 (PVI) 涂层的碳黑上进行热解.
- 在0.1M KOH中对催化剂的ORR活性进行电化学评估.
- 使用合成催化剂制造和测试空气电池.
- 密度函数理论 (DFT) 计算以阐明催化机制.
主要成果:
- 与Fe-N4-N SACs相比,C@PVI-(NCTPP) Fe-800催化剂显示出更高的ORR活性 (E1/2 = 0.89 V与RHE)
- 采用这种催化剂的空气电池实现了高开通电路电压 (1.45V) 和高峰功率密度 (130mW/cm2),超过了商业Pt/C.
- DFT的计算表明,不对称的Fe-N3C-N结构增强了电子捐赠,并促进了O2吸附和激活.
结论:
- 非对称的Fe-N3C-N活动站点架构是设计高性能SAC的有效策略.
- 这种方法显著提高了ORR的催化效率.
- 开发的SAC对先进的能源转换技术有很大的前景.
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