Development of Wet Fabrication for Bioxide Electrodes with Simple Microporous Structure

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15329
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Kyoto Municipal Institute of Industrial Technology and Culture
• Principal Investigator: Konno Yoshiki 地方独立行政法人京都市産業技術研究所, 京都市産業技術研究所, 次席研究員 (60774643)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: めっき / アノード酸化 / 陽極酸化 / 鉄合金 / 酸素還元反応 / 酸素発生反応 / 電極 / 多孔質

Outline of Final Research Achievements

This study proposed an anodizing of electroplated alloy films as a method to form nanoporous electrocatalytic layers for high utilization efficiency of electrode surface without complication of porous structure and agglomeration of catalyst particles. Porous films consisting of Fe-based binary oxide were prepared by anodizing and post-annealing of Fe electroplated films alloyed with Mn, Ni, etc. The porous films showed good activity for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The porous films on the Fe-Ni electroplated films have a unique structure that is not observed on Fe-Ni alloys produced by pyrometallurgical processes. The effects of pore length and pore diameter of the porous anodic films on the utilization efficiency of electrode surface for ORR and OER were also clarified.

Free Research Field

電気化学，表面処理

Academic Significance and Societal Importance of the Research Achievements

本研究では，組成を制御した鉄合金めっき膜のアノード酸化によって，酸素還元反応・酸素発生反応（ORR・OER）に触媒活性な複酸化物からなる多孔質膜を生成できること,及び作製した多孔質膜のポア構造が電極特性に及ぼす影響を明らかにした。まためっき膜のアノード酸化特有の新奇な材料を創製できる可能性を発見した。本研究は既存の塗布法にはない長所を有し，安価かつ量産性にも優れためっきとアノード酸化法を用いた新規プロセスによって，良好なORR・OER電極を作製し得ることを示したことから，燃料電池や水電解技術における機能性電極の高機能化と低コスト化に資することで，カーボンニュートラル社会の実現などに貢献する。