Tailoring of highly active amorphous oxide electrodes derived from anodizing of iron-base alloys

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02469
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Hokkaido University
• Principal Investigator: Habazaki Hiroki 北海道大学, 工学研究院, 教授 (50208568)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: アルカリ水分解 / 酸素発生反応 / 電極触媒 / アノード酸化

Outline of Final Research Achievements

Highly efficient hydrogen production by alkaline water electrolysis is an important process for achieving carbon neutrality. In this study, we found that the overpotential of the oxygen evolution reaction in KOH solution can be significantly reduced by simple anodic oxidation of commercially available FeNiCo and FeNi alloys, and that the electrode has excellent durability. It was also found that the porous fluoride layer formed by anodic oxidation is an excellent precursor that is quickly converted to highly active oxyhydroxides in KOH.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

アルカリ水電解は最も低コストなグリーン水素製造法であるが，更なる高効率化が求められている。本研究では，過電圧の大きな酸素発生反応に関して，活性が低い汎用FeNiCo合金がその表面にフッ化物含有有機電解液中におけるアノード酸化によって生成する多孔質筆禍物層が前駆体となり，KOH水溶液中において活性層が生成し，過電圧が大幅に低減するという，学術的にも社会的にも意義のある結果が得られたと判断している。