Effects of hot pressing conditions on the performance of Nafion membranes coated by ink-jet printing of Pt/MWCNTs electrocatalyst for PEMFCs
Effects of hot pressing conditions on the performance of Nafion membranes coated by ink-jet printing of Pt/MWCNTs electrocatalyst for PEMFCs
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DOI：
10.1016/j.ijhydene.2012.04.139
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发表时间：
2012-08
影响因子：
7.2
通讯作者：
Maryam Yazdanpour;A. Esmaeilifar;S. Rowshanzamir
中科院分区：
文献类型：
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作者：
Maryam Yazdanpour;A. Esmaeilifar;S. Rowshanzamir
在我们之前的工作中，采用水热法制备了Pt/MWCNTs纳米复合材料，Pt，低平均Pt纳米颗粒尺寸（2.8 nm）和99 m2 g-1的比表面积。本文采用催化剂涂膜法制备了水热合成Pt/MWCNTs纳米催化剂膜电极。为此目的，使用商业HP喷墨打印机将Pt/MWCNT油墨（作为催化剂油墨）直接沉积到基底（Nafion膜或贴花基底）上，阳极和阴极的负载量均为0.2mg cm-2 Pt。通过Taguchi实验设计方法，使用温度（100和130 °C）、压力（800和1000 psi）和时间（3和5 min）作为有效实验参数，研究热压条件对MEA性能的影响。膜电极的压缩比是通过测试热压过程前后的厚度来确定的。通过极化曲线和循环伏安法对膜电极的性能进行了表征，并通过扫描电子显微镜（SEM）观察了电极的表面形貌。结果表明，最适宜的热压条件为800 psi、100 °C、3 min。电化学分析和物理性能测试表明，CCM法制备的膜电极具有更好的性能比传统的贴花纸转移（DT）法制备的膜电极。
In our previous work, a hydrothermal method was employed to prepare Pt/MWCNTs nanocomposites with 20 wt.% Pt, a low mean Pt nanoparticles size (2.8 nm) and a specific surface area of 99 m2g−1. In this work, the membrane electrode assemblies (MEAs) with hydrothermally synthesized Pt/MWCNTs nanocatalysts were fabricated by catalyst-coated membrane (CCM) method. For this purpose, a commercial HP inkjet printer was used to deposit Pt/MWCNTs ink (as catalyst ink) directly on to the substrate (Nafion membrane or decal substrate) with a loading of 0.2 mg cm−2Pt for both the anode and cathode. The effects of hot-pressing conditions on the performance of MEAs were investigated through Taguchi design of experiments method using temperature (100 and 130 °C), pressure (800 and 1000 psi) and time (3 and 5 min) as effective experimental parameters. The compression ratios of MEAs were determined by testing the thicknesses before and after hot-pressing process. The performance of MEAs was characterized by the polarization curves and cyclic voltammetry (CV) and the surface morphologies of the electrodes were observed by scanning electron microscopy (SEM). The results showed that the most appropriate hot-pressing conditions were 800 psi, 100 °C, and 3 min. Electrochemical analysis and physical property examination revealed that the MEA fabricated by CCM method has a better performance compared to the one prepared by conventional decal transfer (DT) method.