Journal
JOURNAL OF POWER SOURCES
Volume 476, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228454
Keywords
Ammonia oxidation reaction; Direct ammonia fuel cells; Anion exchange membrane; Solid oxide; Electro-catalysts
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [25211817]
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Ammonia, an indirect hydrogen storage media containing a high content of hydrogen (17.8 wt. %), could be an ideal carbon-free fuel for fuel cells. The DAFCs employed alkaline anion exchange membranes (AEMs), referring to the low temperature AEM-DAFCs, not only have merits of the high energy efficiency, but are compatible with non-precious catalysts without ammonia decomposition process, which means a lower cost compared to proton exchange membrane fuel cells. Unlike high-performance of direct ammonia solid oxide fuel cells (high temperature SO-DAFCs), the low catalytic activity of the electro-catalysts and the difficulty of ammonia oxidation at low temperatures lead to far worse performance of low temperature AEM-DAFCs. Therefore, this article is trying to offer some incentives and indicate a direction for the future development of DAFCs. First, this review emphasizes previous development tracks and current progress on low temperature AEM-DAFCs and high temperature SO-DAFCs. For the low temperature AEM-DAFCs, the current progress of platinum-based and non-platinum-based electro-catalysts, high conductivity membranes, the low catalytic activity and membrane degradation issues will be summarized. The performance comparison of high temperature SO-DAFCs with various electrode and electrolyte materials and long-term stability issues will be discussed in the later section.
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