Enhanced platinum utilization efficiency of polymer-coated carbon black as an electrocatalyst in polymer electrolyte membrane fuel cells

被引：19
|
作者：
Jayawickrama, Samindi Madhubha [1 ]
Han, Ziyi [1 ]
Kido, Shusaku [1 ]
Nakashima, Naotoshi [2 ]
Fujigaya, Tsuyohiko [1 ,2 ,3 ,4 ]
机构：
[1] Kyushu Univ, Grad Sch Engn, Dept Appl Chem, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2NER, World Premier Int Res Ctr Initiat, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[3] JST PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan
[4] Kyushu Univ, CMS, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
来源：
ELECTROCHIMICA ACTA | 2019年 / 312卷
基金：
日本科学技术振兴机构; 日本学术振兴会;
关键词：
Polymer electrolyte fuel cells; Pt utilization efficiency; Power density; Nafion distribution; Pt deposition; REDUCTION REACTION ACTIVITY; CATHODE CATALYST LAYER; OXYGEN-REDUCTION; PARTICLE-SIZE; SURFACE-COMPOSITION; RELATIVE-HUMIDITY; IONOMER CONTENT; ULTRA-LOW; PERFORMANCE; POLYBENZIMIDAZOLE;
D O I：
10.1016/j.electacta.2019.05.007
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The utilization efficiency of platinum (Pt) in polymer electrolyte membrane fuel cells (PEMFCs) needs to be increased to lower the cost of PEMFCs to facilitate their widespread commercialization. Here we developed a novel method to improve the Pt utilization efficiency by coating of polybenzimidazole (PBI) on the surface of the carbon support material; Vulcan. Electrochemical experiments revealed that Pt nanoparticle-loaded PBI-coated Vulcan (denoted as Vulcan/PBI/Pt) electrode possessed a much larger electrochemically active surface area (ECSA) compared with that of Pt nanoparticles directly deposited on Vulcan (Vulcan/Pt). The power density of the cell with Vulcan/PBI/Pt was 1.16 kWg(-1), which was ca. 20% higher than that of the control cell using Vulcan/Pt (0.97kWg(-1)). We considered that the higher Pt utilization efficiency of Vulcan/PBI/Pt than Vulcan/Pt resulted in such an enhanced ECSA and power density of the PBI-coated system. Two possible reasons were considered for the improvement; namely 1) the polymer layer prevented the loading of Pt nanoparticles into inaccessible micropores of Vulcan and 2) the polymer layer improved the coating homogeneity of Nafion ionomer, and thus improved the proton accessibility for Pt nanoparticles. (C) 2019 Published by Elsevier Ltd.
引用
收藏
页码：349 / 357
页数：9
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