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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Membrane electrode assembly based on buckypaper with gradient distribution of platinum, proton conductor and electrode porosity
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Membrane electrode assembly based on buckypaper with gradient distribution of platinum, proton conductor and electrode porosity

机译：基于铂，质子导体和电极孔隙率梯度分布的膜电极组件

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摘要

A three-dimensional catalyst layer (CL) with gradient distribution of key components based on double-layered buckypaper (BPCL) as cathode for proton exchange membrane fuel cells (PEMFCs) was fabricated. This novel structured BPCL was prepared by using multi-walled carbon nanotubes (MWCNTs) and carbon nanofibers (CNFs) as main framework structure and Pt/C catalyst as active sites. The gradient distribution of platinum (Pt) nanoparticles, proton conductor (Nafion ionomer) and electrode porosity along the thickness of CL were established to reduce Pt loading and facilitate the transportation of protons, reactants and products. Two critical parameters for fabricating membrane electrode assembly (MEA), Nafion content which influences the proton transfer process in CL and hot-pressing temperature which affects the combination situation of CL with electrolyte membrane, were further optimized to promote proton transfer efficiency and decrease the contact resistance between CL and membrane. By using this unique structure, a maximum power density of 536.8 mW cm(-2) was achieved at cell temperature of 80 degrees C, inlet gas pressure of 100 kPa and relative humidity of 80% with an ultra-low Pt loading of 0.09 mg(Pt) cm(-2) in cathode. The generated cathodic Pt utilization is 0.168 g(Pt) kW(-1), reducing by 20.1% compared with the MEA based on traditional catalyst coated on membrane (CCM) process (0.21 g(Pt) kW(-1)). (C) 2018 Elsevier B.V. All rights reserved.
机译：制造了基于双层抗甲基玻璃（BPCL）作为质子交换膜燃料电池（PEMFC）的双层抗型碎蛋白（BPCL）的关键部件梯度分布的三维催化剂层（CL）。通过使用多壁碳纳米管（MWCNT）和碳纳米纤维（CNFS）作为主要骨架结构和Pt / C催化剂作为活性位点来制备这种新型结构化BPCl。建立铂（Pt）纳米颗粒，质子导体（Nafion离聚物）和沿Cl厚度的梯度分布，以减少Pt加载并促进质子，反应物和产物的运输。用于制造膜电极组件（MEA）的两个关键参数，影响CL和热压温度中的质子转移过程的Nafion含量，从而进行了影响Cl的热压温度，从而进行了电解质膜的组合情况，以促进质子转移效率并降低接触Cl和膜之间的抗性。通过使用这种独特的结构，在40℃的电池温度下实现536.8mw cm（-2）的最大功率密度，100kPa的入口气体压力和80％的相对湿度为0.09mg （Pt）cm（-2）在阴极中。产生的阴极PT利用率为0.168g（Pt）kW（-1），与基于膜（CCM）工艺的传统催化剂（0.21g（pt）kW（-1））相比，与MEA相比减少了20.1％。 （c）2018年elestvier b.v.保留所有权利。

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