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Engineering surface functional groups of MXenes for advanced catalysis and energy technology
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DOI:10.1039/D6NH00047A.png)
Abstract
En 中文
MXenes; as an emerging class of two-dimensional transition metal carbides; nitrides; and carbonitrides; have attracted extensive attention in catalysis and energy technology owing to their unique properties; including metallic conductivity; hydrophilic surfaces; and structural diversity. A key distinguishing feature of MXenes lies in the richness and tunability of their surface functional groups (Tx; e.g.; –O; –OH; –F); which serve as a powerful lever for precisely engineering the material's structural; electronic; mechanical; and chemical characteristics. The deliberate modulation of Tx; achieved through Tx engineering; including in situ synthesis control or post-synthetic treatments; directly governs critical properties such as work function; electrical conductivity; hydrophilicity; and oxidation stability. These tailored properties; in turn; drive performance enhancements in surface-sensitive applications: in electrocatalysis; Tx engineering optimizes intermediate adsorption and charge transfer for reactions like hydrogen evolution and CO2 reduction; in energy storage devices such as batteries and supercapacitors; it enhances ion accessibility; redox activity; and cycling stability. This review systematically summarizes recent advances in surface Tx engineering of MXenes; elucidating the fundamental mechanisms linking Tx customization to property evolution and application-specific performance. By discussing Tx engineering strategies; structure–property–performance relationships; and mechanistic roles of distinct Tx; we aim to provide a deep understanding of how Tx tunability makes MXenes particularly suited for catalysis and energy technologies; while also outlining future directions for rational surface design in this rapidly evolving field.
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