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Vol.63, No.2, 161 ~ 168, 2025
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| Title |
| Performance Trade-Off in Nickel-Based Hydrogen Evolution Catalysts for Anion Exchange Membrane Water Electrolysis: Effects of the Nickel Oxidation State and Particle Size |
| 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 |
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| Abstract |
| 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 Ni0 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 Co3O4 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) |
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| Key Words |
| Anion exchange membrane water electrolysis, Hydrogen evolution reaction, Hydrogen production, Ni electrocatalyst, Non-precious catalyst |
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