Gradient design of Pt/C ratio and Nafion content in cathode catalyst layer of PEMFCs
Gradient design of Pt/C ratio and Nafion content in cathode catalyst layer of PEMFCs
复制标题
PEMFCs阴极催化剂层Pt/C比和Nafion含量的梯度设计
DOI：
10.1016/j.ijhydene.2017.06.229
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发表时间：
2017-12-14
影响因子：
7.2
通讯作者：
Ouyang, Minggao
中科院分区：
文献类型：
--
作者：
Chen, Guang-Ying;Wang, Cheng;Ouyang, Minggao
为了提高Pt的利用率，降低传质损失，提高聚合物电解质膜燃料电池（pemfc）在低湿度和高电流密度下的性能，制备了两层不同Pt/C比和Nafion含量的阴极催化剂层，并对其性能进行了评价。采用极化曲线（IVs）、循环伏安法（CV）和电化学阻抗谱（EIS）表征和比较不同湿化条件下Pt/C比和Nafion含量梯度对pemfc性能的影响。结果表明，在阴极催化剂层靠近膜的亚层中分配更多的Nafion和Pt/C可以显著提高膜电极组件（MEA）的性能。与单阴极催化剂层的MEA相比，具有最佳梯度阴极催化剂层的MEA在80 RH%和20 RH%条件下的催化剂利用率分别为0.403 g kW（额定）（-1）和0.711 g kW（额定）（-1）。在高湿和低湿条件下，最优MEA的面功率密度分别比常规单层催化剂层MEA高28.4%和135.7%。(C) 2017年由Elsevier Ltd代表Hydrogen Energy Publications LLC出版。
In order to increase the utilization of Pt, reduce mass transfer loss and improve the performance of polymer electrolyte membrane fuel cells (PEMFCs) under low humidity and high current densities, the cathode catalyst layers with two layers of different Pt/C ratio and Nafion content are fabricated and evaluated. Polarization curves (IVs), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are employed to characterize and compare the effects of Pt/C ratio and Nafion content gradient on the performance of PEMFCs under different humidification conditions. The results indicate that the performance of the membrane electrode assembly (MEA) can be significantly improved via allocating more Nafion and Pt/C in the sublayer near the membrane in cathode catalyst layer. The MEA with optimal gradient cathode catalyst layer results in improved catalysts utilization compared to MEA with single cathode catalyst layer, 0.403 g kW(rated)(-1) and 0.711 g kW(rated)(-1) under 80 RH% and 20 RH%, respectively. The areal power density of the optimal MEA is 28.4% and 135.7% higher than the conventional single-layer catalyst layer MEA under high and low humidity, respectively. (C) 2017 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.