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通过热氧化诱导的RuO₂通过PtRu/C催化剂上的阻断外提高PEMFC阳极中的CO耐受性

Lina Chen¹, Pengyang Zhang¹, Yan-Qi Jin¹

¹College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Tan Kah Kee Innovation Laboratory, Xiamen University, Xiamen 361005, China.

|August 19, 2024

概括

在PtRu/C催化剂上的一种新型Ru氧化物层通过阻断CO吸附,显著提高了质子交换膜燃料电池 (PEMFC) 的性能. 这一突破提高了实际燃料电池应用的二氧化碳耐受性和耐久性.

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
催化剂是一种催化剂.

背景情况:

基于 (Pt) 的阳极催化剂的一氧化碳 (CO) 中毒严重降低了质子交换膜燃料电池 (PEMFC) 的性能.
与实验室三电极设置相比,现有的耐CO催化剂在实际的PEMFC系统中通常表现出有限的有效性.

研究的目的:

开发一种简单有效的策略,在商业PtRu/C催化剂上创建一个阻CO的层.
为了提高极催化剂的CO耐受性和耐用性,用于实际的PEMFC应用.

主要方法:

采用简单的热氧化策略,在商业PtRu/C上创建一层氧化物 (RuO2) 阻断层.
这涉及一阶段的分离和氧化过程,形成一个薄 (0.7 nm) 的RuO2层.
用旋转盘电极测试和在各种CO度下在功能性PEMFC中评估了催化剂性能.

主要成果:

PtRu@RuO2/C催化剂显著提高了CO耐受性,在旋转盘电极测试中持久1%的CO (比PtRu/C提高了约10倍).
在PEMFC中,催化剂保持了高氧化反应 (HOR) 活性和CO耐受性,在100ppm的CO时显示微不足道的性能损失.
在经过4小时的稳定性测试后,催化剂保持了85%的HOR活性,这表明了极好的耐用性.

结论:

氧化阻断层有效地抑制了CO吸附,从而提高了催化剂对CO中毒的耐受性.
这种方法提供了一种实际的方法来提高PEMFC阳极催化剂的性能和耐用性.
该机制涉及减缓CO吸附动力学,而不是传统的双功能CO氧化途径.

关键词:

耐受性对CO的耐受性 RuO2 阻外可以阻氧化物.氧化反应是一种氧化反应.质子交换膜燃料电池是如何使用的热分离的热分离方式

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