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一个Fe单原子种子介导的战略向Fe₃C/FeNC催化剂与优秀的双功能ORR/OER活动

Jiangwei Chang¹, Qi Zhang², Jingkun Yu¹

¹Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|May 31, 2023

概括

研究人员开发了一种新的Fe单原子催化剂,用于可充电的空气电池. 这种先进的电催化剂增强了氧气减少和演化反应,提高了电池的性能和耐用性.

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
储能储能储能储能储能储能

背景情况:

可充电的空气电池 (ZAB) 的商业化需要低成本,高性能双功能氧气电催化剂.
现有的电催化剂在ZAB应用中经常面临成本,效率和稳定性方面的挑战.

研究的目的:

设计和合成一种新的双功能电催化剂,用于高效的氧降解反应 (ORR) 和氧演化反应 (OER).
研究Fe-N-C和Fe3C活性位点的结构-活性关系,以优化电化学性能.
为了证明在可充电ZAB中开发的电催化剂的有效性.

主要方法:

使用单个Fe原子种子介导的策略,与Fe-N-C活性位点集成的Fe3C物种的制造.
调整Fe-N-C和Fe3C的比例,以优化电子相互作用和协调环境.
对ORR和OER活动的催化剂的电化学表征,包括电压差异 (ΔE) 测量.
使用开发的电催化剂作为空气阴极的ZAB的组装和测试.

主要成果:

一个结构优化的Fe-N-C/Fe3C电催化剂在ORR和OER之间实现了0.668V的低电压差异 (ΔE).
催化剂显示出最佳的双功能OER/ORR基准性能之一.
使用这种催化剂的ZAB表现出高的特定容量 (818.1 mAh gZn−1) 和功率密度 (1013.9 mWh gZn−1).
对于ZABs,观察到超过450小时的长期耐用性.

结论:

单个Fe原子种子介导的策略有效地创造了Fe-N-C和Fe3C站点之间的协同相互作用,以增强双功能氧气电催化.
优化的催化剂为可充电ZAB提供了一个有希望的低成本,高性能解决方案.
这项工作为设计用于储能应用的先进原子站点催化剂提供了有价值的方法.

关键词:

在Fe-N-C单原子催化剂中.在 Fe3C 的基础上.Fe3C氧降解反应 (ORR) 是一种氧降解反应.碳点是指碳点的部分.氧气演变反应 (OER) 是一种氧气演变反应.

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