通过Pd-O-Gd桥进口反约束轨道占用促进了电催化氧减少
Shuwang Ning1, Meng Li1, Xuan Wang1
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
Angewandte Chemie (International ed. in English)
|November 9, 2023
概括
这项研究开发了稀土氧化物修饰的催化剂,用于氧降解反应 (ORR). Pd-Gd2O3 / C催化剂表现出卓越的ORR活性和稳定性,表现优于金,并显示出对Zn-空气电池的希望.
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:
- 基于的材料对于能源设备中的氧降解反应 (ORR) 是至关重要的.
- 通过界面相互作用调整的电子特性是提高ORR性能的关键.
研究的目的:
- 合成和描述基于碳的新型稀土 (RE) 氧化物修饰的催化剂.
- 研究Pd-RExOy接口相互作用对ORR活性和耐久性的影响.
- 评估这些催化剂在电化学能源设备中的潜力.
主要方法:
- 使用RE金属有机框架合成基于碳的稀土氧化物 (Gd2O3,Sm2O3,Eu2O3,CeO2).
- 制造 Pd-RExOy/C 催化剂.
- 电化学描述ORR性能 (开始电位,半波电位,稳定性).
- 理论分析包括DFT和微动力学建模.
- 在Zn-空气电池中作为空气阴极进行测试.
主要成果:
- 该Pd-Gd2O3 / C催化剂表现出高启动潜力 (0.986V_RHE) 和半波潜力 (0.877V_RHE) 的优良稳定性.
- Pd和Gd2O3之间的强合形成了一个Pd-O-Gd桥梁,促进电荷再分配和优化OH吸附.
- Pd-Gd2O3/C显示了接近理论最佳的ORR活性,表现优于Pt.
- 对于Pd-Sm2O3 / C,Pd-Eu2O3 / C和Pd-CeO2 / C催化剂也观察到类似的有希望的结果.
- 该Pd-Gd2O3 / C催化剂在Zn-空气电池中表现出卓越的性能.
结论:
- 稀土氧化物修饰通过界面相互作用有效调整Pd催化剂的ORR性能.
- Pd-Gd2O3 / C催化剂为ORR提供了一个高度活跃和持久的替代Pt.
- 这些发现凸显了RE氧化物修饰Pd催化剂在像Zn-空气电池这样的能量转换装置中的实际应用.
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