铁-碳双原子催化剂由一个限制缺陷的丰富离子策略制备,用于有效的氧降解反应
Xiaopeng Zhang1,2, Cheng Gao1,2, Lin Chen1,2
1State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China.
一种新的Fe/Co双原子催化剂 (FeCo-NC) 用两步热解方法合成,用于高效的氧降解反应 (ORR). 这种催化剂在气电池中表现出色,证明了其实际适用性.
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
- 催化剂是一种催化剂.
背景情况:
- 双原子催化剂显示出氧降解反应 (ORR) 的潜力.
- 开发高效和稳定的催化剂对于能量转换设备至关重要.
- 现有的催化剂往往遭受聚合和有限的活动.
研究的目的:
- 通过一种简单的两步热解方法合成一种新的Fe/Co双原子催化剂 (FeCo-NC).
- 为ORR研究FeCo-NC的结构-活性关系.
- 为了评估FeCo-NC在空气电池中的性能.
主要方法:
- 一种两步热解方法,涉及Fe-Zn-ZIF前体.
- 富含的FeCo-NC与富含缺陷的碳基质的合成.
- 密度函数理论 (DFT) 计算来理解ORR机制.
主要成果:
- 对于ORR,FeCo-NC在0.1M KOH中表现出0.92V的正半波电位 (E1/2) 在ORR中.
- DFT的计算确定OH*的化是决定速度的步骤,Fe-Co的非对称的电荷分布降低了激活能量.
- 催化剂在液体和固体Zn-空气电池中表现出极好的稳定性和活性,达到180.02mW cm-2的功率密度和超过200小时的连续运行.
结论:
- 合成的FeCo-NC是一种高效的ORR电催化剂.
- 富有缺陷的结构和协同的Fe-Co相互作用有助于增强的催化活性.
- FeCo-NC在储能设备 (如Zn-空气电池) 中的实际应用方面显示出很大的前景.
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