|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
In Situ Activation of Anodized Ni-Fe Alloys for the Oxygen Evolution Reaction in Alkaline Media
| Title: | In Situ Activation of Anodized Ni-Fe Alloys for the Oxygen Evolution Reaction in Alkaline Media |
| Authors: | Yamada, Naohito Browse this author | | Kitano, Sho Browse this author →KAKEN DB | | Yato, Yuya Browse this author | | Kowalski, Damian Browse this author | | Aoki, Yoshitaka Browse this author →KAKEN DB | | Habazaki, Hiroki Browse this author →KAKEN DB |
| Keywords: | electrocatalysts | | oxygen evolution reaction | | anodizing | | Ni-Fe alloy | | porous anodic film |
| Issue Date: | 28-Dec-2020 |
| Publisher: | American Chemical Society |
| Journal Title: | ACS applied energy materials |
| Volume: | 3 |
| Issue: | 12 |
| Start Page: | 12316 |
| End Page: | 12326 |
| Publisher DOI: | 10.1021/acsaem.0c02362 |
| Abstract: | A simple anodizing technique has been employed to develop highly active electrocatalysts that can be applied to the oxygen evolution reaction (OER) in alkaline media. NiFe alloys were electrodeposited and anodized to form a porous electrocatalytic layer. This approach produces highly active electrodes without the need for noble metals, binders, or conductive carbon additives. The as-anodized electrode initially exhibits poor OER activity in 1.0 mol dm(-3) KOH; however, the effects of potential cycling improve the OER activity to an extent that an overpotential as low as 0.26 V at 10 mA cm(-2) is observed for the anodized Ni-11.8 at. % Fe electrode. Although significant in situ activation is achieved with anodized NiFe electrodes, this activation is less significant for as-deposited NiFe or anodized Ni electrodes. Furthermore, OER activity is observed to be composition-dependent, with the Ni-11.8 at. % Fe electrode exhibiting the greatest activity. A porous fluoride-rich, Fe-doped Ni oxyfluoride layer produced by anodizing is converted via potential cycling to an amorphous or poorly crystalline Fe-doped Ni(OH)(2) layer with a nanoflake-like morphology. The high activity is maintained even after the removal of most of the fluoride. Thus, the F-rich, Fe-doped Ni oxyfluoride is a promising precursor to develop a highly active OER electrode. |
| Rights: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied energy materials, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsaem.0c02362, see http://pubs.acs.org/page/policy/articlesonrequest/index.html. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/83735 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 幅崎 浩樹
|
