电解
可再生能源
碱性水电解
电解水
制氢
高温电解
聚合物电解质膜电解
氢
电力转天然气
环境科学
分离器(采油)
电解槽
高压电解
废物管理
工艺工程
材料科学
化学
电极
电解质
工程类
电气工程
物理
物理化学
有机化学
热力学
作者
Aaron Hodges,Anh Linh Hoang,George Tsekouras,Klaudia Wagner,Chong Lee,Gerhard F. Swiegers,Gordon G. Wallace
标识
DOI:10.1038/s41467-022-28953-x
摘要
Renewable, or green, hydrogen will play a critical role in the decarbonisation of hard-to-abate sectors and will therefore be important in limiting global warming. However, renewable hydrogen is not cost-competitive with fossil fuels, due to the moderate energy efficiency and high capital costs of traditional water electrolysers. Here a unique concept of water electrolysis is introduced, wherein water is supplied to hydrogen- and oxygen-evolving electrodes via capillary-induced transport along a porous inter-electrode separator, leading to inherently bubble-free operation at the electrodes. An alkaline capillary-fed electrolysis cell of this type demonstrates water electrolysis performance exceeding commercial electrolysis cells, with a cell voltage at 0.5 A cm-2 and 85 °C of only 1.51 V, equating to 98% energy efficiency, with an energy consumption of 40.4 kWh/kg hydrogen (vs. ~47.5 kWh/kg in commercial electrolysis cells). High energy efficiency, combined with the promise of a simplified balance-of-plant, brings cost-competitive renewable hydrogen closer to reality.
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