期刊
NATURE ENERGY
卷 4, 期 9, 页码 786-795出版社
NATURE PORTFOLIO
DOI: 10.1038/s41560-019-0462-7
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资金
- Israeli Ministry of National Infrastructure, Energy and Water Resources
- European Research Council under the European Union's Horizon 2020 research and innovation programme [727606]
- Nancy and Stephen Grand Technion Energy Program
- Adelis Foundation
- Arturo Gruenbaum Chair in Material Engineering
- European Research Council (ERC) [727606] Funding Source: European Research Council (ERC)
Electrolytic hydrogen production faces technological challenges to improve its efficiency, economic value and potential for global integration. In conventional water electrolysis, the water oxidation and reduction reactions are coupled in both time and space, as they occur simultaneously at an anode and a cathode in the same cell. This introduces challenges, such as product separation, and sets strict constraints on material selection and process conditions. Here, we decouple these reactions by dividing the process into two steps: an electrochemical step that reduces water at the cathode and oxidizes the anode, followed by a spontaneous chemical step that is driven faster at higher temperature, which reduces the anode back to its initial state by oxidizing water. This enables overall water splitting at average cell voltages of 1.44-1.60 V with nominal current densities of 10-200 mA cm(-2) in a membrane-free, two-electrode cell. This allows us to produce hydrogen at low voltages in a simple, cyclic process with high efficiency, robustness, safety and scale-up potential.
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