Metal hydride mediated water splitting: Electrical energy saving and decoupled H2/O2 generation
| Autor: | Kai Fu, Hai Wen Li, Rui Xiao, Yong Wu, Xingguo Li, Yanru Guo, Jun Chen, Shaolei Yang, Jie Zheng |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Hydride Mechanical Engineering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Hydrogen storage chemistry Chemical engineering Mechanics of Materials Water splitting Reversible hydrogen electrode General Materials Science Dehydrogenation 0210 nano-technology |
| Zdroj: | Materials Today. 47:16-24 |
| ISSN: | 1369-7021 |
| DOI: | 10.1016/j.mattod.2021.02.019 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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