一种双功能的铁氧减氧/氧进化催化剂,用于高性能可充电空气电池
Zhengfan Chen1, Weiyi Cheng2, Kecheng Cao3
1Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128, Mainz, Germany.
Small (Weinheim an der Bergstrasse, Germany)
|November 28, 2024
概括
一种新型的双功能电催化剂,在碳纳米管中包裹的化碳上,具有原子分散的铁和位,在氧气减少和进化反应中表现出色. 这种催化剂使水性空气电池具有高效率和耐久性.
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
- 纳米技术 纳米技术
背景情况:
- 氧降解反应 (ORR) 和氧演化反应 (OER) 的电催化剂对于燃料电池和金属空气电池等能量转换装置至关重要.
- 开发稳定高效的双功能催化剂仍然是推动这些技术发展的关键挑战.
研究的目的:
- 为ORR和OER合成和描述一种新的双功能电催化剂 (FeNi-NC@MWCNTs).
- 为了评估催化剂在水性空气电池 (ZAB) 中的性能.
- 用实验和理论方法阐明催化剂的结构-活性关系.
主要方法:
- 在化碳 (FeNi-NC) 上合成原子分散的FeNi位点,这些位点被包裹在多壁碳纳米管 (MWCNT) 上.
- 对ORR和OER进行电催化性能测试.
- 在水性空气电池中集成和测试催化剂.
- 密度函数理论 (DFT) 计算用于结构和电子分析.
主要成果:
- FeNi-NC@MWCNTs催化剂表现出0.69V的低OER/ORR电压差,表明高双功能活性.
- 催化剂在水性ZAB中表现出色,达到1.44V的开通电路电压,特定容量为782mAhg-1,峰值功率密度为218mWcm-2.2.
- 在600个充电/放电周期中,ZAB系统表现出了显著的长期耐用性.
结论:
- FeNi-NC@MWCNTs催化剂,具有独特的FeNi双原子位点和增强的导电性,是一种高效和稳定的双功能电催化剂.
- 该研究提供了对基于原子分散非贵金属的先进电催化剂的设计原则的关键见解,用于能源应用.
- 在ZAB中展示的性能突显了这种催化剂在实际储能和转换装置中的潜力.
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