构建Fe-N4站点通过离子交换介导的转化Fe协调环境在层次碳支持高效氧气减排的碳支持
Lingbo Zong1, Kaicai Fan2, Lixiu Cui1
1International Cooperation United Laboratory of Eco-chemical Engineering and Green Manufacturing, Technology Innovation Center of Battery Safety and Energy Storage Technology, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
研究人员开发了一种新方法,用于制造高效的单原子催化剂,用于氧降解反应 (ORR). 这种离子交换策略精确地设计了活性站点,提高了空气电池的性能.
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:
- 在碳支上与原子协调的单个原子 (SAs) 是氧减少反应 (ORR) 的有效活性场所.
- 设计具有可访问活性位点的单原子催化剂 (SAC) 仍然是一个重大挑战.
- 铁-N4部分对于高ORR活性至关重要.
研究的目的:
- 为制造Fe-N4单原子催化剂 (SACs) 提出一种新的离子交换战略.
- 研究金属单个原子和它们的协调环境的现场演变.
- 为了提高ORR性能,提高活性站点的电化学可访问性和利用性.
主要方法:
- 离子交换策略将Fe-O4转化为Fe-N4的配置.
- 由空心碳球 (HCS) 组成的等级碳纳米板的制造.
- 热激活过程,以设计Fe单个原子的协调环境.
- 电化学表征以评估ORR性能.
主要成果:
- 成功合成Fe单个原子,固定在具有Fe-N4配置的等级碳纳米板 (Fe-SA/N-HCS) 中.
- 通过离子交换证明了Fe-O4到Fe-N4活性位点的现场转化.
- 实现了Fe-N4站点的高电化学可访问性和利用率.
- 铁-SA/N-HCS表现出极好的ORR性能 (0.91V与RHE) 和稳定性在Zn-空气电池中.
结论:
- 离子交换战略为设计具有量身定制的协调环境的SAC提供了一条新的途径.
- 工程Fe-N4站点显著增强ORR电催化活性.
- 开发的Fe-SA/N-HCS显示了可充电水性和柔性Zn-空气电池的巨大潜力.
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