报告题目：MAX Phases, MXenes, and beyond
报告人：孙正明，东南大学首席教授、国家特聘专家。
时 间：2025年5月9日(周五)9:00
地 点：安徽大学磬苑校区材料科学大楼B401报告厅
主办单位：材料科学与工程学部
报告摘要：MAX phases are a unique class of layered metallic ceramics with the general formula Mn+1AXn (M = early transition metals such as Ti, V, Cr, Mo; A = group A elements such as Si, Al, Sn, Ga, In; X = C and/or N; n = 1–4). They feature a combination of strong ionic/covalent M–X bonds and metallic M–A bonds, giving rise to their distinctive properties. In our recent work, we observed the rapid growth of Sn whiskers from MAX phases via mechanochemical decomposition. The mechanisms underlying this whisker formation are elucidated, and effective strategies are proposed to inhibit their growth, addressing potential safety risks in electronic components. Furthermore, Sn whiskers and their composites derived from MAX phases have been successfully synthesized and applied in electromagnetic interference (EMI) shielding.
MXenes, the two-dimensional derivatives of MAX phases obtained by selective etching of A-site elements, exhibit high electrical conductivity and tunable surface chemistry, making them highly attractive for electrochemical energy storage (EES). However, challenges such as restacking and oxidation hamper their practical application. We present our recent progress in tailoring MXenes and their derivatives through doping, compositing, and surface engineering strategies (e.g., oxidation and selenization), leading to remarkable performance enhancements in a range of EES systems, including supercapacitors, Li/Na/K-ion batteries, lithium-sulfur batteries, zinc-ion batteries, and ammonia-ion batteries. The mechanisms behind these improvements are also discussed in detail.
Finally, we highlight the current challenges and future prospects of MAX phases, MXenes, and their derivatives, aiming to provide guidance and inspiration for young researchers in this evolving field.
孙正明简介：孙正明，东南大学首席教授、国家特聘专家。回国前在日本产业技术综合研究所（AIST）任主任研究员兼国际部长助理。回国后历任东南大学材料学院首届学术委员会主任、学院院长、党委书记等职。近年来，在金属性陶瓷MAX相材料、二维MXene等材料的基础研究及能源与环境领域应用方面取得系列重要进展，得到国家重点研发、国家自然科学基金重点及面上、江苏省双创团队等重大科研项目支持。在Nat. Commun.、Angew. Chem. Int. Ed.、Adv. Mater.、Adv. Energy Mater.、Energy Environ. Sci.、Acta Mater.等期刊发表学术论文300余篇，授权发明专利40余项。任中国材料研究学会理事，中国复合材料学会常务理事，江苏省材料学会副会长等职。获中国侨界贡献奖，江苏省科学技术奖，复合材料学会科学技术奖等。
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