一个前所未有的CeO2/C非贵金属电催化剂用于直接甲酸燃料电池
Chenxi Qiu1, Qiang Zhou1, Rui Gao1
1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Nanomaterials (Basel, Switzerland)
|October 14, 2023
概括
我们在碳黑上开发了一种新的氧化 (CeO2) 催化剂,用于直接甲酸燃料电池 (DAAFC). 这种CeO2/C催化剂显著提高了燃料电池性能和功率密度,为清洁能源技术提供了有前途的进步.
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
- 纳米技术纳米技术
背景情况:
- 直接甲酸燃料电池 (DAAFC) 在燃料处理和安全方面具有优势.
- DAAFCs的性能严重依赖于亚酸氧化反应 (AAOR) 的效率.
- 现有的AAOR电催化剂,通常仅限于碳黑,其活性较低.
研究的目的:
- 合成和描述一种用于增强DAAFC中的AAOR的新型电催化剂.
- 研究新型电催化剂的催化机制和稳定性.
- 为了评估DAAFCs使用开发的电催化剂的性能.
主要方法:
- 湿化学沉的Ce(OH) 3,然后进行热处理,在碳黑上形成CeO2纳米颗粒.
- 电化学表征,包括循环电压测量和时测量.
- 用于表面分析的X射线光电子光谱 (XPS).
- 密度函数理论 (DFT) 计算以阐明反应机制.
- 基于质子交换膜的DAAFCs的制造和测试.
主要成果:
- 在碳黑 (CeO2/C) 上均分布的CeO2纳米粒子 (3.9 ± 1.1 nm) 成功合成.
- 与碳黑相比,CeO2/C对AAOR的峰值电流密度增加了1.7倍 (13.1 mA cm-2对比7.67 mA cm-2).
- 根据XPS和DFT的计算,表面Ce3+和CeO2上的特定氧位点促进了AAOR.
- 与碳黑相比,CeO2 / C催化剂表现出卓越的稳定性,仅损失了17.8%的电流密度.
- 含有CeO2/C的DAAFC在质子交换膜系统中实现了41.3 mW cm-2的创纪录功率密度.
结论:
- 新的CeO2/C电催化剂显著增强了AAOR活动和稳定性.
- 性能提升归因于CeO2纳米粒子和碳支的协同效应.
- 这一发展代表了DAAFC技术的重大进步,为更高性能燃料电池铺平了道路.
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