Effects of ionomer content on Pt catalyst/ordered mesoporous carbon support in polymer electrolyte membrane fuel cells

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL Journal of Power Sources Pub Date : 2013-01-15 DOI:10.1016/j.jpowsour.2012.09.012

Chi-Yeong Ahn , Jae-Yeong Cheon , Sang-Hoon Joo , Junbom Kim

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引用次数: 45

Abstract

In this paper, the optimum Nafion ionomer content in platinum (Pt) dispersed on ordered mesoporous carbon (OMC) catalyst is investigated. The ionomer content can affect catalytic activity, ionic conductivity and mass transfer characteristics. A nano-replication method using ordered mesoporous silicas (OMS) is applied to prepare OMCs, and Pt/OMC with high loading are synthesized by the incipient wetness method for polymer electrolyte membrane fuel cells (PEMFCs). Catalyst characteristics have been analyzed using TGA, XRD, TEM and BET. Cathode electrodes have different ionomer loadings (in the range of 5–30 wt. %) with Pt/OMCs. Commercial Pt/C catalyst is used in anode. All membrane electrode assemblies (MEAs) fabricated by the decal transfer method show about 0.4 mg cm⁻² Pt loading. The PEMFC performances have been measured by electrochemical methods such as polarization curves, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The performances is different at low and high current density regions, and the optimum content of ionomer is 10 wt. % in the catalyst, due to unique structure of OMCs.

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离子含量对聚合物电解质膜燃料电池中Pt催化剂/有序介孔碳载体的影响

本文研究了分散在有序介孔碳(OMC)催化剂上的铂(Pt)中钠离子的最佳含量。离聚体的含量会影响催化活性、离子电导率和传质特性。采用有序介孔二氧化硅(OMS)的纳米复制方法制备了有序介孔二氧化硅(OMS)，并采用初始湿法制备了用于聚合物电解质膜燃料电池(pemfc)的高负载Pt/OMC。采用TGA、XRD、TEM和BET对催化剂进行了分析。阴极电极与Pt/ omc具有不同的离子负载(在5-30 wt. %的范围内)。阳极采用商用Pt/C催化剂。所有膜电极组件(MEAs)制备的贴花转移法显示约0.4 mg cm−2 Pt负载。利用极化曲线、电化学阻抗谱(EIS)和循环伏安法(CV)等电化学方法对PEMFC的性能进行了测试。在低电流密度区和高电流密度区性能不同，由于omc独特的结构，催化剂中离聚体的最佳含量为10 wt. %。

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来源期刊

Journal of Power Sources 工程技术-电化学

CiteScore

16.40

自引率

6.50%

发文量

1249

审稿时长

36 days

期刊介绍： The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems