精确工程不对称的原子CoN4通过电子捐赠和提取氧气减少反应反应
Minghui Lv1, Cheng-Xing Cui2, Niu Huang1
1College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China.
Angewandte Chemie (International ed. in English)
|March 7, 2024
概括
研究人员开发了新的氧降解反应 (ORR) 催化剂,精确控制了--4 (CoN4) 活性位点. 连接体替代物的电子捐赠能力与增强的ORR催化活性直接相关,基替代催化剂表现最好.
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:
- 了解催化剂结构和活性之间的关系对于开发高效的氧降解反应 (ORR) 催化剂至关重要.
- 在非热解催化剂中精确定义的活性位点为研究这些结构-活性关系提供了一条途径.
- --4 (CoN4) 中心是ORR催化有前途的活性场所.
研究的目的:
- 合成具有明确定义的CoN4中心和可控制的协调环境的模型电催化剂.
- 为了研究连接物替代剂电子特性对ORR催化活性的影响.
- 为了确定CoN4中心的电子密度与它们的ORR性能之间的相关性.
主要方法:
- 对盐和被替代的1,10-phenanthroline连接物在共价三酶框架 (CTF) 上进行序列化.
- 一系列催化剂 (BCTF-Co-phen(X) 的合成,其中X=OH,CH3,H,Br,Cl) 系统地改变电子性能.
- 在性环境中对ORR活动进行电化学评估,包括半波潜力和转变频率 (TOF) 测量.
主要成果:
- 催化剂活性与南联体上的替代组的电子捐赠能力直接相关.
- 具有电子捐赠基组的BCTF-Co-phen (OH) 催化剂表现出最高的ORR催化活性.
- 这种优化的催化剂在0.80V与RHE相比实现了0.80V的半波潜力和47.4 × 10^-3Hz的TOF在0.80V与RHE.
结论:
- 调节连接体的电子特性提供了一个有效的策略来调整基于CoN4的ORR催化剂的活性.
- 电子捐赠基组显著提高了CoN4活性位点的ORR性能.
- 这些发现为用于能源转换应用的先进电催化剂的合理设计提供了宝贵的见解.
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