电子 - 捐赠者 - 接受者相互作用 增强金属有机聚合物的电催化活性,以减少氧气
Bingyu Huang1, Xiannong Tang1, Yaoshuai Hong1
1Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry and Chemical Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Angewandte Chemie (International ed. in English)
|June 28, 2023
概括
研究人员开发了基于四亚氨烯 (TAA) 的新型聚合物纳米复合物,用于氧降解反应 (ORR) 催化. 最优的催化剂CoTAA-Cl@GR,由于定制的电子特性和高效的动力学,表现出优异的ORR性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 金属Nx位点是氧降解反应 (ORR) 的有希望的电催化剂.
- 这些活跃地点的精确结构与财产关系尚不清楚.
- 基于1,4,8,11-tetraaza[14]annulene (TAA) 的材料为催化剂设计提供了潜力.
研究的目的:
- 为了构建基于TAA的聚合物纳米复合材料与受控的电子微环境.
- 研究ORR中金属-Nx活性位点的结构-性质相关性.
- 为了实现高性能电催化剂的氧降解反应.
主要方法:
- 基于TAA的聚合物纳米复合物的合成,具有不同的β位置换剂.
- 密度函数理论 (DFT) 计算以了解电子结构和相互作用.
- 在现场扫描电化学显微镜和变频方波电压测量以探测反应动力学.
主要成果:
- 最佳催化剂CoTAA-Cl@GR表现出极好的ORR性能,周转频率为0.49 e-1 site-1.1.
- DFT计算显示,d-轨道调节由-Cl替代物优化OH*中间相互作用.
- 高可访问位点密度和快速电子传播有助于优越的ORR动力学.
结论:
- 定制金属Nx站点的电子微环境对于高性能ORR催化剂至关重要.
- 开发的基于TAA的纳米复合材料为设计高效的电催化剂提供了一个有前途的平台.
- 本研究为ORR和其他电化学反应的合理催化剂设计提供了理论指导.
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