음이온 교환막 수전해용 니켈 기반 수소 발생 반응 촉매의 니켈 산화수 및 입자 크기에 따른 성능 트레이드 오프 연구

• Published in: 대한금속재료학회지 Vol. 63; no. 2; pp. 161 - 167
• Main Authors: 이재훈, Jaehun Lee, 김남인, Nam In Kim, 진송, Song Jin, 박준영, Junyoung Park, 하준석, Jun Seok Ha, 김치호, Chiho Kim, 이주영, Jooyoung Lee, 김양도, Yangdo Kim, 최승목, Sung Mook Choi
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.02.2025
• Subjects: Anion exchange membrane water electrolysis; Hydrogen evolution reaction; Hydrogen production; Ni electrocatalyst; Non-precious catalyst
• ISSN: 1738-8228
• DOI: 10.3365/KJMM.2025.63.2.161

The development of green hydrogen through anion exchange membrane water electrolysis (AEMWE) is essential for achieving carbon neutrality. Developing non-precious-metal catalysts for the hydrogen evolution reaction (HER) is crucial for the commercialization of AEMWE. In this study, Ni-CeO₂/ C catalysts were synthesized via a co-precipitation method and a reduction heat treatment was conducted from 300 to 500 ℃ to form metallic Ni for the HER. Through this process, CeO₂ nanoparticles were uniformly dispersed around Ni metal nanoparticles. Among these catalysts, Ni-CeO₂/C 400 exhibited a prominent Ni 0 peak according to an XPS analysis and formed smaller nanoparticles compared to Ni-CeO₂/C 500, yielding advantageous physicochemical properties for the HER. Subsequently, an electrochemical half-cell LSV analysis demonstrated the lowest HER overpotential of 164 mV at 10 mA cm -2 and a Tafel slope of 89 mV dec-1, suggesting the formation of a trade-off point in the HER performance due to variations in the oxidation state and particle size of the Ni metal. Furthermore, a non-precious-metal-based AEMWE single cell with Ni- CeO₂/C 400 as the cathode and Co 3 O 4 as the anode achieved a current density of approximately 700 mA cm -2 at 2.0 Vcell. It also exhibited stable durability at a constant current of 500 mA cm -2 for 100 hours, suggesting the potential for long-term hydrogen production in non-precious-metal-based AEMWE systems. (Received 14 November, 2024; Accepted 16 December, 2024)