Park, Young Sang Chae, Ari Choi, Gwan Hyun Ram, Swetarekha Lee, Seung-Cheol Bhattacharjee, Satadeep Jung, Jiyoon Jeon, Hyo Sang Ahn, Cheol-Hee Hwang, Seung Sang Koh, Dong-Yeun In, Insik Oh, Taegon Kim, Seon Joon Koo, Chong Min Lee, Albert S. 2024-03-07T05:00:04Z 2024-03-07T05:00:04Z 2024-03-07 2024-06 0926-3373 https://pubs.kist.re.kr/handle/201004/149405 The role of 2D transition metal carbides, also known as MXenes, as active catalyst supports in Co-based oxygen evolution reaction (OER) catalysts was elucidated through a combination of experimental and computation electrochemistry. Through facile seeding of commericial Co nanoparticles on three different MXene supports (Ti3C2Tx, Mo2Ti2C3Tx, Mo2CTx), Co@MXene catalysts were prepared and their electrochemical properties examined for alkaline OER electrocatalysts. The OER activity enhancement of Co was significantly improved for Mo2CTx and Mo2Ti2C3Tx supports, but marginal on the Ti3C2Tx in rotating disk electrode and membrane electrode assembly tests. The Co@Mo2CTx exhibited the highest anion exchange water electrolysis performance of 2.11 A cm- 2 at 1.8 V with over 700 h of stable performance, exceeding previous benchmarks for non-platinum group (non-PGM) metal OER catalysts. The superior performance was attributed to the strong chemical interaction of Co nanoparticle with the Mo2CTx MXene support. Insights into the electrochemical and chemical oxidation according to MXene type as related to cell durability, as well the effect of electrical conductivity and inherent boosting of electrocatalytic activity of Mo-based MXenes elucidated through density functional theory (DFT) calculations helped explain the performance and durability enhancement of Mo-based MXene supports over Ti3C2Tx supports. English Elsevier BV Unveiling the role of catalytically active MXene supports in enhancing the performance and durability of cobalt oxygen evolution reaction catalysts for anion exchange membrane water electrolyzers Article 10.1016/j.apcatb.2024.123731 1 Applied Catalysis B: Environment and Energy, v.346 Applied Catalysis B: Environment and Energy 346 N scie scopus 001165118600001 2-s2.0-85182904959 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXIDATION COMPOSITE FILMS MXene Oxygen evolution catalyst Anion exchange membrane water electrolyzer