NiFe layered double hydroxides synthesized based on solvent properties as anode catalysts for enhanced oxygen evolution reaction
- Authors
- Gu, Yoonhi; Park, Deok-Hye; Kim, Min-Ha; Byeon, Jeong-Hyeon; Lim, Da-Mi; Park, Seon-Ha; Kim, Ji-Hwan; Jang, Jae-Sung; Park, Kyung-Won
- Issue Date
- Jan-2024
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Anion exchange membrane water electrolysis; Oxygen evolution reaction; Anode catalyst; NiFe layered double hydroxide; Solvent ratio-adjusted hydrothermal synthesis
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.480
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 480
- URI
- https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/49095
- DOI
- 10.1016/j.cej.2023.147789
- ISSN
- 1385-8947
1873-3212
- Abstract
- NiFe layered double hydroxides (LDH) with their high specific surface areas have been used as alternatives to noble metal catalysts for the oxygen evolution reaction (OER) in anion exchange membrane water electrolysis. However, for bulk LDH structures, relatively narrow interplanar distances can lead to the slow diffusion of OH- and the induction a local acidic atmosphere, resulting in catalyst corrosion. In this study, we synthesize solvent (water and ethanol) ratio-adjusted NiFe LDH anode catalysts to enhanced the OER. Results show that the catalyst prepared at a 5:5 ratio of water and ethanol (WE 55) delivers a low overpotential of 310 mV at 50 mA cm(-2), Tafel slope of 40.5 mV dec(-1), and 100 h-stability in a half-cell test, and a high current density of 744.2 mA cm(-2) at 1.8 V and 70 degrees C in a single-cell test. WE 55 exhibits a manipulated oxygen vacancy and a substantially high specific surface area of similar to 164.5 m(2) g(-1), leading to improved charge transfer and mass transport rates.
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