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Solvation structure design for stabilizing MXene in transition metal ion solutions

SusMat 2024年第3期4卷 214-226页

作者： Jie Wang Guohao Li guanshun xie Zhaohui Huang Peng Zhang Benhua Xu Xiuqiang xie Nan Zhang College of Materials Science and Engineering Hunan UniversityChangshaChina Qinghai Provincial Engineering Research Center of High-Performance Light Metal Alloys and Forming Qinghai Provincial Key Laboratory of New Light AlloysQinghai UniversityXiningChina Chemical Engineering College Qinghai UniversityXiningChina

Although MXene has attracted great interest in diverse fields,it is susceptible to oxidation in water(H_(2)O)with transition metal ions such as Co^(2+),Fe^(2+),and Cu^(2+),which is pronounced at high *** impedes the preparation of MXene-based composites and their functional ***,this study revealed that Co^(2+)increases the maximum and average atomic charge of H in H_(2)O to improve the reactivity of H_(2)O,which leads to the fact that Co^(2+)catalyzes the oxidation of Ti_(3)C_(2)T_(x)***,the addition of N,Ndimethyl formamide(DMF)reduces theH_(2)Oactivity and improves the oxidation stability of Ti_(3)C_(2)T_(x)in the presence of Co^(2+)via preferentially forming coordination bonds with Co^(2+).This strategy is also effective in enhancing the oxidation tolerance of Ti_(3)C_(2)T_(x)to Fe^(2+)in H_(2)***,it is feasible to enhance the oxidation stability of Ti2CTx MXene in H_(2)O with the existence of Co^(2+).By virtue of these,the CoO/Ti_(3)C_(2)T_(x)composite was successfully prepared without obvious Ti_(3)C_(2)T_(x)oxidation,which is desirable to harness the advantages of Ti_(3)C_(2)T_(x)as the complementary component for lithium-ion *** work provides a straightforward paradigm to enhance the oxidation resistance of MXene in H_(2)O in the presence of transition metal ions and at high temperatures,which opens a new vista to use MXene for target applications.

关键词： hydrogen bonds N N-dimethyl formamide solvation structure stability Ti_(3)C_(2)T_(x)MXene transition metal ions

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Surface chemistry engineering and the applications of MXenes

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Journal of Materiomics 2023年第6期9卷 1160-1184页

作者： Guohao Li Shuhan Lian Jie Wang guanshun xie Nan Zhang Xiuqiang xie College of Materials Science and Engineering Hunan UniversityChina

MXenes have captured extensive attention in various fields by virtue of unique hydrophilicity,high conductivity and tunable surface *** this review,the state-of-the-art progresses of designing functional MXenes have been ***,the synthesis methods of MXenes are summarized and classified into HF etching,in-situ HF etching and fluoride-free etching approaches based on the effect on the surface chemistry of ***,the factors that affect the surface termination groups are discussed,including synthesis methods,heat treatment temperature and ***,this review gives an overview of the synthetic routes of functional MXenes including termination modification by synthesis methods and heat treatment,heteroatom(N,S,or P)doping,cation and organic molecule intercalation and hybridization with polymer,which inhibit restacking and increase active sites for intrinsically enhancing the inherent physical and chemical properties of ***,the applications with respect to energy storage and conversion,catalysis,sensors,electromagnetic interference shielding and microwave absorption of functional MXenes are ***,the critical challenges and development prospects of functional MXenes are also highlighted.

关键词： MXenes Top-down synthesis of MXenes Functional surface groups Optimizations of surface chemistry

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