Metal hydride mediated water splitting: Electrical energy saving and decoupled H2/O2 generation |
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| Affiliation: | 1. Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan;2. Energy Process Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba West 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan;3. Division of Materials Science, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, Japan;4. The Center for Rare Earth Research, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, Japan |
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| Abstract: | Reversible hydrogen absorption/desorption, the very fundamental property of metal hydrides (MHs), can be utilized to innovate the water splitting process. Spontaneous hydrogen absorption by a MH electrode shifts the water reduction potential to 0.3 V above the reversible hydrogen electrode. Then, the absorbed hydrogen can be released to give H2 by thermal dehydrogenation at mild temperature below 70 °C by utilizing low grade heat. The MH mediated water splitting combines the electrochemical hydrogen absorption in Ni-MH batteries and the thermal dehydrogenation in gas phase hydrogen storage, which significantly reduces the electrical energy consumption for water splitting up to 25 kJ (mol H2)−1 compared to an ideal hydrogen evolution catalyst and also automatically leads to decoupled H2/O2 generation. The advantages and mechanisms of the MH mediated water splitting are demonstrated by MH electrodes with surface Pd coating. |
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