Engineered surface oxidation of porous metal substrate for simultaneous enhancement of kinetics and durability in electrochemical hydrogen evolution reaction
- Type
- Article
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.700, no.Part 3
- Issued Date
- 2025-12
- Abstract
- This study presents an effective approach to enhancing the catalytic performance, long-term stability, and surface hydrophilicity of porous nickel (Ni) substrates for the hydrogen evolution reaction (HER) via controlled surface oxidation without additional catalysts. In this study, the Ni tape-cast substrate (Ni-TCS), fabricated through a tape-casting method followed by oxidation and reduction treatments, exhibited a large surface area and fine porosity, resulting in a significantly improved catalytic activity compared to conventional Ni foam. Through partial oxidation at temperatures ranging from 300 degrees C to 450 degrees C, a catalytically favorable nickel oxide (NiO) nano layer was produced directly on the Ni-TCS surface, enhancing the HER activity and stabilizing the NiO/Ni interface for durability. Additionally, the NiO nano layer rendered the electrode surface hydrophilic as confirmed through contact angle measurements, facilitating effective electrolyte contact and improving mass transport. The Ni-TCS electrode oxidized at 400 degrees C (Ni-TCS400) demonstrated the highest HER activity, sustaining excellent stability at 500 mA cm-2 over 500 h. Ni-TCS400 exhibited lower kinetic and mass-transfer overpotentials than those of the Ni-TCS in an alkaline water electrolyzer (AWE) system, while a voltage of 1.81 V was required to achieve a current density of 0.4 A cm-2. Overall, the partial oxidation strategy circumvents the use of binders or precursors, while enabling improved stability, simplified fabrication, and high catalytic activity, making it a promising approach for the development of durable, efficient AWE electrodes.
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- ISSN
- 0021-9797
- Appears in Collections:
- Department of Chemistry > 1. Journal Articles
Department of Environment and Energy Engineering > 1. Journal Articles
- 파일 목록
-
-
관련 파일이 존재하지 않습니다.
-
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.