构建表面Ruoct─O─Cooct单元与优化的Cooct旋转状态,以增强氧气减少和进化
Can-Wen Yu1, Zi-Qiang Chen1, Hong-Yi Xu1
1School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou Higher Education Mega Center, Guangzhou University, No. 230 Wai Huan Xi Road, Guangzhou, 510006, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|August 24, 2024
概括
在氧化螺旋催化剂中的贵金属替代增强了氧演化和还原反应 (OER/ORR). 这种新的Ru替代催化剂在空气电池中表现出卓越的性能和改进的电荷转移.
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:
- 将贵金属纳入螺旋结构是开发高效氧化演变/还原反应 (OER/ORR) 催化剂的关键策略.
- 了解这些催化剂内的电子相互作用对于优化它们的性能至关重要.
研究的目的:
- 为增强OER/ORR活性合成和表征Ru替代的螺旋催化剂 (Rux-Mn0.5Co2.5−xO4/NCNTs).
- 为了研究由替代引起的电子结构修改及其对催化性能的影响.
主要方法:
- 离子交换方法在旋结构中用Ruoct替换表面Cooct.
- 电化学表征以评估OER/ORR性能和空气电池效率.
- 分析电子结构的变化,包括d频段中心移动和频段间隙缩小.
主要成果:
- Ruoct─O─Cooct单元促进电子转移,导致d频段中心向下移动,并缩小d-p带间隙.
- 在eg-轨道中观察到氧气中间体的优化吸附和电子占用.
- 实现了0.71V的低ORR/OER电压差.
- 在空气电池中证明了高峰功率密度 (148.8 mW h cm−2) 和能量密度 (813.6 mA h gZn−1).
- 在500小时的10 mA cm-2和200小时的50 mA cm-2.2下表现出极好的长期稳定性.
结论:
- 在-氧化物旋转器中替代是一种有效的策略,可以促进OER/ORR电催化.
- 观察到的电子结构修改对于增强的催化活性和稳定性至关重要.
- 这项研究为设计用于能源应用的先进氧气电催化剂提供了宝贵的见解.
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