Electric round-trip efficiency of hydrogen and oxygen-based energy storage |
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| Affiliation: | 1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;2. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;3. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China;4. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;1. Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Ave., Ann Arbor, MI 48109-2122, United States;2. Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States;1. Environmental System Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, South Korea;2. Department of Environment & Energy Mechanical Engineering, University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea;1. Infrastructure, Geomatics and Architecture Research Division, University of Nottingham, UK;2. Mechanics, Materials and Structures Research Division, University of Nottingham, UK |
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| Abstract: | An electrolyzer and a fuel cell have been integrated in a small-scale stand-alone renewable energy system to demonstrate that hydrogen can be used for long-term stationary energy storage. The economic and environmental performance of such a system is strongly related to the ability of the electrolyzer to convert electrical energy to hydrogen and the ability of the fuel cell to convert hydrogen back to electrical energy, which together define the round-trip efficiency of the hydrogen storage system. One promising way to improve the efficiency as well as to decrease the capital costs of the fuel cell is to recuperate the oxygen from the electrolyzer and use it as the fuel cell oxidant instead of compressed air. This paper presents the modifications made to the system in order to implement oxygen recuperation. The round-trip system efficiency was found to be 18% with oxygen recuperation and 13.5% without it. |
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