在无金属共价有机框架中精确调节碳活动地点,用于增强氧气减排电催化
Jianchuan Liu1, Jie Zhao2, Cuiyan Li1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130012, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 13, 2023
概括
基于非金属二[a,c]的共价有机框架 (DBP-COFs) 对氧降解反应 (ORR) 显示出出色的性能. 一个DBP-COF的JUC-650是性ORR和空气电池的高效电催化剂.
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:
- 无金属碳基材料是氧减少反应 (ORR) 的有希望的电催化剂.
- 有效的活性点对于高效的ORR催化是必不可少的.
- 共价有机框架 (COF) 为催化应用提供可调节的结构.
研究的目的:
- 为了合成和评估无金属二[a,c]胺基共价有机框架 (DBP-COFs) 作为ORR电催化剂.
- 研究DBP-COFs在性电解质中的催化机制和性能.
- 评估DBP-COFs作为空气电池 (ZAB) 的空气阴极催化剂的潜力.
主要方法:
- 合成了两个DBP-COFs:JUC-650和JUC-651.
- 在性介质中对ORR的电催化性能评估.
- 密度函数理论 (DFT) 计算,以了解电子结构和活性站点.
- 组装DBP-COF作为ZAB的空气阴极催化剂.
主要成果:
- JUC-650表现出卓越的ORR性能,其起始潜力为0.90V与RHE,半波潜力为0.72V与RHE.
- DFT的计算显示,调节电子配置可以降低Schiff基碳活性位点的吸附能量,从而提高ORR.
- 作为ZAB中的空气阴极催化剂,DBP-COF的性能与商业Pt/C的性能相当.
结论:
- 据报道,JUC-650是迄今为止最有效的无金属COF ORR电催化剂之一.
- 在DBP-COF中精确调节活跃站点策略,从而实现高效的ORR.
- DBP-COFs是贵金属催化剂的可行替代品,用于像ZABs这样的能量转换技术.
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