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

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-01-13 DOI:10.1016/j.apcatb.2024.123731

Young Sang Park , Ari Chae , Gwan Hyun Choi , Swetarekha Ram , Seung-Cheol Lee , Satadeep Bhattacharjee , Jiyoon Jung , Hyo Sang Jeon , Cheol-Hee Ahn , Seung Sang Hwang , Dong-Yeun Koh , Insik In , Taegon Oh , Seon Joon Kim , Chong Min Koo , Albert S. Lee

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Abstract

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 (Ti₃C₂T_x, Mo₂Ti₂C₃T_x, Mo₂CT_x), Co@MXene catalysts were prepared and their electrochemical properties examined for alkaline OER electrocatalysts. The OER activity enhancement of Co was significantly improved for Mo₂CT_x and Mo₂Ti₂C₃T_x supports, but marginal on the Ti₃C₂T_x in rotating disk electrode and membrane electrode assembly tests. The Co@Mo₂CT_x 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 Mo₂CT_x 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 Ti₃C₂T_x supports.

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揭示催化活性 MXene 支持物在提高阴离子交换膜水电解槽钴氧进化反应催化剂的性能和耐用性方面的作用

通过实验和计算电化学相结合的方法，阐明了二维过渡金属碳化物（又称 MXene）作为活性催化剂载体在 Co 基氧进化反应（OER）催化剂中的作用。通过在三种不同的 MXene 支撑物（Ti3C2Tx、Mo2Ti2C3Tx、Mo2CTx）上简便地播种普通 Co 纳米颗粒，制备了 Co@MXene 催化剂，并考察了它们在碱性 OER 电催化剂中的电化学特性。在旋转盘电极和膜电极组装测试中，Mo2CTx 和 Mo2Ti2C3Tx 支持物对 Co 的 OER 活性有显著提高，但在 Ti3C2Tx 支持物上则微不足道。Co@Mo2CTx 的阴离子交换水电解性能最高，在 1.8 V 电压下达到 2.11 A cm-2，性能稳定超过 700 小时，超过了以往非铂族（非PGM）金属 OER 催化剂的基准。优异的性能归功于钴纳米粒子与 Mo2CTx MXene 支承的强烈化学作用。通过密度泛函理论（DFT）计算阐明了与电池耐久性相关的 MXene 类型的电化学和化学氧化作用，以及导电性的影响和 Mo 基 MXene 电催化活性的固有增强，这有助于解释 Mo 基 MXene 支持物相对于 Ti3C2Tx 支持物的性能和耐久性增强。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.