构建由金属有机框架衍生出的添加碳层次结构,作为Zn-Air电池的高性能ORR阴极材料
Yangdan Pan1, Junkuo Gao1, Yuwen Li2
1School of Materials Science and Engineering, Institute of Functional Porous Materials, The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-Tech University, 310018, Hangzhou, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 10, 2023
概括
在层次结构中的新型CoNiPt合金催化剂显著提高了空气电池 (ZAB) 的氧降解反应 (ORR) 活性. 这种具有成本效益的催化剂超过了商业金,为工业ZAB应用铺平了道路.
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:
- 高效且价格合理的催化剂对于空气电池 (ZAB) 的工业化至关重要.
- 氧降解反应 (ORR) 是ZAB中的一个关键过程,需要有效的催化材料.
- 目前的催化剂通常面临成本和性能方面的局限性.
研究的目的:
- 开发一种新的,具有成本效益的催化剂,用于ZAB中的阴极氧降解反应 (ORR).
- 合成一个分离的CoNiPt合金嵌入N-doped多孔碳与一个层次的纳米花结构.
- 调查ZABs中增强的催化活性和性能.
主要方法:
- 使用热解霍夫曼型金属有机框架 (MOFs) 合成一个CoNiPt合金催化剂.
- 催化剂的层次纳米花 (NFs) 结构和组成的表征.
- 在性介质中对催化剂的ORR活性进行电化学测试,并组装到ZAB中.
主要成果:
- 对于性ORR,CoNiPt@C NFs催化剂表现出0.93V的高半波潜力.
- 催化剂的质量活性是商业Pt/C的7.5倍,超过了最先进的贵金属催化剂.
- 组装后的ZAB实现了172 mW cm-2的最大功率密度,超过了商业Pt/C+RuO2系统的性能.
结论:
- 层次的NF结构增强了活性部位和反应动力学,以获得卓越的ORR性能.
- 氧缺陷和物种之间的协同相互作用优化了催化活性.
- 这种MOF衍生催化剂为ZAB中具有成本效益的性ORR催化剂提供了实用策略.
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