直接co进料高温质子交换膜燃料电池的优化负载铑单原子催化剂

IF 9.5 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Chunqiang Zhuang, Huanqiao Li, Xiaoming Zhang, Hong Zhang, Suli Wang and Gongquan Sun
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引用次数: 0

摘要

粗氢中一氧化碳(CO)的存在是阻碍氢燃料电池商业化的重要因素。上游引入直接CO燃料电池,可选择性氧化脱除粗氢中的CO,从而释放电能。纯化后的粗氢随后被送入下游的氢燃料电池,这有助于减轻铂(Pt)催化剂的中毒效应。铑(Rh)和铱(Ir)基单原子催化剂(SACs)在电化学CO氧化反应(COOR)中显示出潜力。然而,SAC活性位点密度低(Rh金属负载<;1 wt%)阻碍了它们在直接CO燃料PEMFC中的进一步发展。为了解决这一问题,研究人员开发了一种两步热解方法,在n掺杂碳上产生了一系列原子分散的Rh, Rh金属负载从0.25 wt%到7.43 wt%不等。半电池测试结果表明,随着Rh负载的增加,COOR在1 mA/cm2 CO氧化下的过电位逐渐降低,而极限电流密度逐渐增大,表明在较高的金属负载下,COOR在SAC上具有较高的活性。确定最佳铑金属负载为2.88 wt%,极限电流密度为2.4 mA/cm2,质量活度高达4.18 a /mgRh。此外,在使用直接CO进料的高温单电池中,实现了208.4 mW/cm2的峰值功率密度,从而在22小时内表现出稳定的性能。这一发现表明了潜在的强大的CO去除能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Rh single-atom catalysts with optimized metal loading for direct CO-feed high-temperature proton exchange membrane fuel cells†

Rh single-atom catalysts with optimized metal loading for direct CO-feed high-temperature proton exchange membrane fuel cells†

The presence of carbon monoxide (CO) in crude hydrogen is a significant factor hindering the commercialization of hydrogen fuel cells. Introducing a direct CO fuel cell upstream can selectively oxidize and remove CO from crude hydrogen, thereby releasing electrical energy. The purified crude hydrogen is then fed into the downstream hydrogen fuel cell, which helps mitigate the poisoning effect on platinum (Pt) catalysts. Rhodium (Rh) and iridium (Ir) based single-atom catalysts (SACs) have demonstrated potential in the electrochemical CO oxidation reaction (COOR). However, the low density of SAC active sites (Rh metal loading <1 wt%) hinders their further development for use in direct CO fueled PEMFCs. To address this challenge, a two-step pyrolysis method was developed, yielding a series of atomically dispersed Rh on N-doped carbon with several different Rh metal loadings from 0.25 wt% to 7.43 wt%. Half-cell test results demonstrated that with the increment of Rh loading, the overpotential for the COOR at 1 mA cm−2 of CO oxidation gradually decreased, while the limiting current density gradually increased, indicating the high COOR activity on the SAC with a higher metal loading. The optimum Rh metal loading was determined to be 2.88 wt% and the limiting current density was found to be 2.4 mA cm−2 with a mass activity of up to 4.18 A mgRh−1. Furthermore, a peak power density of 208.4 mW cm−2 was achieved in a high-temperature single cell utilizing direct CO feed, thereby demonstrating a stable performance over a 22-hours period. This finding indicates a potential robust CO removal capability.

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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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