集群规模的多站点接口增强基阳极催化剂,用于性阴离子交换膜燃料电池
Xiaozhong Zheng1, Shuxin Zhang2, Xinying Zheng1
1School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058, China.
Advanced materials (Deerfield Beach, Fla.)
|March 7, 2025
概括
-氧化物催化剂通过防止竞争性吸附来增强性离子交换膜燃料电池. 这种新型接口可以提高氧化反应动力学和燃料电池性能.
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:
- (Ru) 为基离子交换膜燃料电池 (AEMFC) 中的阳极催化剂提供了与相比具有成本效益的替代品.
- 对于Ru催化剂来说,一个关键的挑战是 (Had) 和 (OHad) 种类的竞争性吸附,阻碍了效率.
- 开发先进的阳极催化剂对于提高AEMFC的性能和耐用性至关重要.
研究的目的:
- 设计和研究一种与氧化物 (Ru-WOx) 接口的强度合的多站点电催化剂.
- 通过为Had和OHad创建不同的活性站点来克服AEMFC中的竞争性吸附问题.
- 在设计的催化剂接口上阐明氧化反应 (HOR) 的机制.
主要方法:
- 一个集群规模的Ru-WOx接口电催化剂的合成.
- 电化学表征包括循环电压测量和电化学阻抗光谱学.
- 密度函数理论 (DFT) 计算以了解吸附和反应机制.
主要成果:
- Ru-WOx接口有效消除了竞争性吸附,使Had和OHad在WOx和Ru域的高覆盖率成为可能.
- WOx充当质子海绵,容纳溢出,促进其与Ru-adsorbed基物种的反应.
- 催化剂通过热力学上有利的带有增强动力学的塔菲尔-沃尔默机制促进了HOR.
结论:
- 设计的Ru-WO电催化剂显著改善了AEMFC中的氧化反应.
- 在低催化剂负载 (0.05 mg Ru cm -2) 的情况下,获得了高峰功率密度1.36 W cm -2 .
- 证明了特殊的耐用性,在80小时的运行时间内电压衰变微不足道,为AEMFC催化剂设计提供了新的见解.
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