操纵单个原子的微环境通过切换支晶度为工业的进化
Luqi Wang1, Mingyue Ma1, Chenchen Zhang2
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China.
Angewandte Chemie (International ed. in English)
|December 28, 2023
概括
研究人员通过调整支晶度开发了一种新的单原子催化剂 (SAC) 策略. 这种方法增强了基介质中的演化反应 (HER) 活性,为高效的电催化剂设计提供了一种新的方法.
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:
- 优化单原子催化剂 (SAC) 需要精确控制它们的局部微环境.
- 进化反应 (HER) 对于清洁能源技术至关重要,但在性条件下经常受到催化剂效率的限制.
- 电催化剂的pH依赖性活动可能会阻碍各种应用中的性能.
研究的目的:
- 调查支晶度对HER的鲁 (Ru) 单原子催化剂性能的影响.
- 开发一种策略,在性介质中的SAC中创建局部酸性微环境.
- 提高SACs的催化活性和稳定性,以有效生产气.
主要方法:
- 在低晶度 (LC) 和高晶度 (HC) 氧化支上合成的Ru单原子催化剂.
- 描述了催化剂,以了解结晶性,电子结构和局部环境之间的关系.
- 在性介质中评估了HER的电催化性能,使用了线性扫描电压测量和时测量等技术.
主要成果:
- 在低晶度氧化 (Ru-LC-Ni(OH) 2上的Ru单原子催化剂与高晶度对应物 (Ru-HC-Ni(OH) 2相比,显著增强了HER活性.
- 通过诱导离子聚合,Ru-LC-Ni(OH) 2创造了局部的酸性微环境,克服了依赖pH值的限制.
- 在性海水离子交换膜电解器中,Ru-LC-Ni(OH) 2实现了低超电位 (9 mV在10 mA cm-2) 和优异的稳定性 (500 h在500 mA cm-2).
结论:
- 精确控制支的结晶性是一种可行的策略,可以调节SACs的微环境.
- 低晶体支持激活金属悬挂键,促进局部酸性环境的形成并改善HER.
- 这项工作为设计用于能源应用的高活性和稳定的单原子电催化剂提供了新的范式.
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