Enhancing Voltage Reversal Tolerance of Proton Exchange Membrane Fuel Cells by Tuning the Microstructure of IrOx Catalysts
Enhancing Voltage Reversal Tolerance of Proton Exchange Membrane Fuel Cells by Tuning the Microstructure of IrOx Catalysts
复制标题
通过调整 IrOx 催化剂的微观结构提高质子交换膜燃料电池的电压反转耐受性
DOI：
10.1021/acsami.2c18521
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lin Zeng
中科院分区：
文献类型：
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作者：
Yameng Wang;Yuting Jiang;Jianhua Liao;Zheng Li;Tianshou Zhao;Lin Zeng
质子交换膜燃料电池缺氢引起的电压反转会严重损坏阳极，降低电池性能和寿命。常用的方法是加入析氧反应催化剂（例如，IrO 2）添加到阳极以延长水电解平台以对抗有害的碳腐蚀。本文中，通过去除合成的Ir/C催化剂的低表面积碳载体来制备强连接的IrOx纳米颗粒（SC-IrOx）。SC-IrOx耐反转阳极的抗反转时间为9.32 h，分别是商品IrOx和弱连接IrOx耐反转阳极的3.2倍和4.4倍。进一步的透射电子显微镜表征表明，SC-IrOx在阳极催化层中构建了稳定的电子和质子传输通道，延缓了析氧反应催化剂从电子和质子导电网络中的分离，延长了水电解平台期。在此，我们的研究结果表明，调整IrOxcatalysts的微观结构确实是一种有效的和有前途的方法，以延长水电解平台，并减轻质子交换膜燃料电池的性能下降，在电压反转过程中。
Voltage reversal of proton exchange membrane fuel cells caused by hydrogen deficiency seriously deteriorates the anodes and lowers their performance and lifetime. A commonly used method is to add oxygen evolution reaction catalysts (e.g., IrO2) to the anode to extend the water electrolysis plateau against harmful carbon corrosion. Herein, strongly connected IrOxnanoparticles (SC-IrOx) are prepared by removing the low surface area carbon carrier of the as-synthesized Ir/C catalyst. The reversal-tolerant anode with SC-IrOxowns an anti-reversal time of 9.32 h, which is 3.2 and 4.4 times that of the reversal-tolerant anode with commercial IrOxand weakly connected IrOx, respectively. Further transmission electron microscope characterizations reveal that SC-IrOxcan construct a stable electron and proton transport pathway in the anode catalyst layer, which can delay the isolation of oxygen evolution reaction catalyst from the electron and proton conducting network, thus extending the water electrolysis plateau. Herein, our findings suggest that tuning the microstructures of IrOxcatalysts is indeed an effective and promising approach to extend the water electrolysis plateau and alleviate the performance degradation of proton exchange membrane fuel cells during the voltage reversal process.