GIST Scholar
College of Engineering
Department of Materials Science and Engineering
1. Journal Articles
Crystallinity modification of NiFe layered double hydroxide for efficient and durable oxygen evolution in alkaline water electrolysis
- Type
- Article
- Citation
- Journal of Power Sources, v.689
- Issued Date
- 2026-10
- Abstract
- NiFe-layered double hydroxide (NiFe-LDH) is recognized as an efficient electrocatalyst for the oxygen evolution reaction (OER), but its performance is limited compared to noble metal catalysts due to high resistance from OH− transport through its 2D layered structure. Herein, we propose reducing this resistance by decreasing the crystallinity of NiFe-LDH via in-situ electrochemical modification using cyclic voltammetry (CV) commonly used for activating catalysts in half-cell investigation. After modification (NiFe-LDH_WideCV), the crystal size of the 2D structure is reduced by 23% compared to the catalyst activated by the conventional process (NiFe-LDH_ShortCV), improving the kinetics of OH− redox reaction. As a result, NiFe-LDH_WideCV requires 12 mV less overpotential for alkaline OER at 10 mA cm−2. Furthermore, after 120 h of durability testing, NiFe-LDH_WideCV exhibits 30.7% less Fe leaching than NiFe-LDH_ShortCV with improving durability by 47%. This study introduces an effective method for enhancing NiFe-LDH catalysts, making them more suitable for practical water electrolysis applications. © 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
- Publisher
- Elsevier BV
- ISSN
- 0378-7753
- Appears in Collections:
- Department of Materials Science and Engineering > 1. Journal Articles
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