2021 Fiscal Year Final Research Report
Elucidation of impurity-induced degradation mechanism in solid polymer electrolyte water electrolysis and establishment of characteristic recovery method
Project/Area Number |
19K12401
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 64030:Environmental materials and recycle technology-related
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Research Institution | University of Miyazaki |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 水素 / 固体高分子 / 水電解 / PEM / 劣化 / 回復 |
Outline of Final Research Achievements |
Large-scale production of carbon dioxide-free hydrogen, which produces hydrogen by water electrolysis using electricity derived from renewable energy such as photovoltaic, is an indispensable technology for connecting hydrogen to renewable energy systems. Water electrolysis using a solid polymer electrolyte membrane (PEM) is a high-efficiency and high-purity hydrogen production technology. In this study, we verified the degradation mechanism of the PEM water electrolyzer due to impurities and quantitatively clarified that the adhesion of cations to the membrane is the cause of the degradation. A simple electrochemical treatment was applied to the PEM water electrolysis device whose characteristics had deteriorated due to impurities, and a method for removing impurities without damaging the device was established to recover the electrolysis characteristics.
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Free Research Field |
エネルギー工学
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Academic Significance and Societal Importance of the Research Achievements |
PEM型のようなポリマー隔壁型の水電解装置では、装置保護のため原料として純水を用いることが必須であり、高純度な水の供給が推奨される。しかしながら、水を真にエネルギー源にするためには、莫大な量の純水を使用する必要があり、水処理コストが水素製造コストを押し上げる。不純物による劣化メカニズムを明らかにしたことにより、供給水の純度を下げることが検討できるようになる。さらに、劣化したPEMを簡便な処理で回復することができるため、メンテナンスコストが低減し、再生可能エネルギー由来水素の普及につながる。
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