Impact of catalyst loading, ionomer content, and carbon support on the performance of direct isopropanol fuel cells

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2021-08-01 DOI:10.1016/j.powera.2021.100064
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引用次数: 3

Abstract

Liquid Organic Hydrogen Carriers (LOHC) offer a promising solution for hydrogen storage in the existing infrastructure for conventional fuels. Within this framework, the isopropanol/acetone couple as a light-LOHC system is used to generate electricity in a direct isopropanol fuel cell (DIFC). This work focuses on the impact of catalyst loading, ionomer content and catalyst support on the performance of DIFCs. We achieve a performance rise from 95 mW cm-2 to 219 mW cm-2 under air operation by increasing the anode catalyst loading from 0.5 mg cm-2 to 4 mg cm-2, which can be attributed to the increased abundance of active catalyst sites with higher loadings. In contrast, we find that the cathode loading for the oxygen reduction reaction (ORR) plays a minor role in the performance of DIFCs. Therefore, the cathode loading can be minimized to decrease the total amount of platinum-group metals and, consequently, to save cost. It was also found that an ionomer content of 30% on the anode side is optimal. Additionally, different carbon supports were investigated, where advanced high surface area carbon support showed superior performance to Vulcan with an increase of 20% in power density, motivating the development of new carbon supports for DIFCs.

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催化剂负载、离子含量和碳负载对直接异丙醇燃料电池性能的影响
液态有机氢载体(LOHC)为现有的传统燃料基础设施中的氢储存提供了一个很有前途的解决方案。在此框架下,异丙醇/丙酮偶对作为轻lohc系统用于直接异丙醇燃料电池(DIFC)的发电。本文主要研究了催化剂负载、离子含量和催化剂负载对difc性能的影响。通过将阳极催化剂负载从0.5 mg cm-2增加到4 mg cm-2,我们在空气操作下将性能从95 mW cm-2提高到219 mW cm-2,这可以归因于高负载下活性催化剂位点的丰度增加。相比之下,我们发现氧还原反应(ORR)的阴极负载对difc的性能影响较小。因此,阴极负载可以最小化,以减少铂族金属的总量,从而节省成本。阳极侧离子单体含量为30%为最佳。此外,对不同的碳支架进行了研究,其中先进的高表面积碳支架的性能优于Vulcan,功率密度提高了20%,推动了新型difc碳支架的开发。
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CiteScore
9.10
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0.00%
发文量
18
审稿时长
64 days
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