在Co/NC上支的铁原子集群具有比铁单个原子更高的水氧化活性
Jian Du1,2,3, Yunxuan Ding2,3, Yu Guo2,3
1State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, Dalian 116024, China.
iScience
|July 31, 2023
概括
在碳支上制造铁-双金属电催化剂,以原子级铁隔离增强氧演化反应 (OER) 的性能. 铁纳米集群在-碳混合体上表现出比单个铁原子更高的OER活性.
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:
- 碳支持的铁-双金属电催化剂对氧演化反应 (OER) 显示出有前途.
- 在碳支上实现铁物种的原子级空间隔离,对OER应用来说是一个重大挑战.
研究的目的:
- 开发一种新的策略,用于制造高度分散的原子铁纳米集群和-碳 (Co/NC) 混合体上的单个原子.
- 研究铁前体大小对产生的纳米结构和OER催化活性的影响.
- 为了阐明在OER期间对不同铁配置的活性部位和反应机制.
主要方法:
- 以分子定义的铁复合物 (FePc,Fe(acac) 进行预封装的焦化物伊米达酸框架 (ZIF) -67的热解3).
- 用高负载原子Fe纳米集群 (Fe-ACs) 和Fe单个原子 (Fe-SAs) 合成CoFe双金属多孔碳电催化剂.
- 电化学表征和理论计算以评估OER性能和确定活性站点.
主要成果:
- 成功合成了Fe-ACs@Co/NC和Fe-SAs@Co/NC电催化剂,并控制了原子铁分散.
- 与Fe-SAs@Co/NC和其他ZIF-67衍生催化剂相比,Fe-ACs@Co/NC表现出更高的OER性能.
- 理论分析表明,在FeOOH-ACs/Co3O4接口上,Co是Fe-ACs@Co/NC中的活性位点,而Fe则被提出为Fe-SAs@Co/NC中的活性位点.
结论:
- 拟议的热解策略有效地实现了对CoFe双金属电催化剂中的铁物种的原子级控制.
- 在Co/NC混合体上支持的铁纳米集群提供了增强的OER活动,突出显示了纳米结构和组成的重要性.
- 了解和铁活性站点的不同作用对于设计先进的OER电催化剂至关重要.
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