Catalyst layer doped with phosphotungstic acid for degradation mitigation in Polymer Electrolyte Membrane Fuel Cells
Catalyst layer doped with phosphotungstic acid for degradation mitigation in Polymer Electrolyte Membrane Fuel Cells
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DOI：
10.1016/j.ijhydene.2016.04.222
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发表时间：
2016-09
影响因子：
7.2
通讯作者：
Guangying Chen;Cheng Wang;Yijie Lei;Jianbo Zhang;Z. Mao;Jianning Guo;Jianlong Wang
中科院分区：
文献类型：
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作者：
Guangying Chen;Cheng Wang;Yijie Lei;Jianbo Zhang;Z. Mao;Jianning Guo;Jianlong Wang
本研究的目的是提高耐久性和性能的聚合物电解质膜燃料电池（PEMFC）的运输应用。采用加热超声-喷涂法制备了催化剂层为磷钨酸（PTA）的改性催化剂涂层膜（CCM），并根据DOE CCM/电池堆耐久性实验方案对改性CCM和传统CCM进行了耐久性研究。在CCM耐久性加速应力试验中，采用循环伏安法、极化曲线法、线性扫描伏安法和电化学阻抗谱法对CCM的性能进行了诊断。实验结果表明，在100 h老化后，改性CCM的功率密度仅下降了14%，而传统CCM的功率密度下降了33%，这表明在CCM催化层中添加PTA是提高CCM耐久性的有效途径，其原因在于利用PTA的优异性能，氧化还原性能和质子导电性。
The aim of this study was to enhance durability and performance of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) for transportation application. A modified catalyst coated membrane (CCM) with phosphotungstic acid (PTA) in catalyst layer was fabricated using a heating ultrasonic-spray method, and durability study of both the modified CCM and traditional CCM was carried out according to the DOE CCM/stack durability protocol. During the accelerated stress test of CCM durability, cyclic voltammetry, polarization curves, linear sweep voltammetry and electrochemical impedance spectroscopy were employed for diagnosis of the CCM performances. The experimental results indicate that the power density of the modified CCM decreased only 14% while the traditional CCM decreased 33% after 100-h aging time, which confirms that addition of PTA in the catalyst layer of CCM is an effective way to improve the durability for CCM attributed to the enhancement of intermediates removal and the increasing of proton transfer channels by using the PTA excellent properties, both redox property and proton conductivity.