報(bào)告時間：2024年12月17日（星期二），14:30-15:30

報(bào)告地點(diǎn)：升華樓616學(xué)術(shù)報(bào)告廳

報(bào)告人：余愿 研究員

工作單位：德國亞琛工業(yè)大學(xué)

舉辦單位：化學(xué)與化工學(xué)院，高值催化轉(zhuǎn)化與反應(yīng)工程安徽省重點(diǎn)實(shí)驗(yàn)室，安徽省柔性智能材料創(chuàng)制與應(yīng)用工程研究中心

報(bào)告人簡介：

余愿博士目前在亞琛工業(yè)大學(xué)（德國精英大學(xué)）擔(dān)任課題組組長、研究員、PI。他于2012年和2017年獲得合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院學(xué)士與博士學(xué)位，導(dǎo)師祖方遒教授。于2018-2022年在德國亞琛工業(yè)大學(xué)從事博士后研究工作，合作導(dǎo)師為德國科學(xué)院院士Matthias Wuttig教授。于2022年起在亞琛工大擔(dān)任Group Leader，從事熱電材料、相變材料、超價(jià)鍵（metavalent bonding）理論、以及三維原子探針（APT）技術(shù)等相關(guān)工作。迄今共計(jì)發(fā)表SCI論文95篇，總計(jì)被引用4000次，H因子33。以通訊和第一/共一作者在Science, Nat. Mater., Nat. Commun.(4), Adv. Mater., Mater. Today, Energy Environ. Sci.(2), J. Am. Chem. Soc.(2), Adv. Energy Mater.(5), Adv. Funct. Mater.(10)等期刊發(fā)表論文47篇，其中IF>15的文章33篇。擔(dān)任包括Science在內(nèi)的幾十種知名期刊審稿人，擔(dān)任中國科技期刊卓越行動計(jì)劃高起點(diǎn)新刊Nano Research Energy以及金屬學(xué)報(bào)英文版的青年編委。

報(bào)告簡介：

Metavalent bonding (MVB) describes a unique, half-filled σ-bond characterized by a single electron between adjacent atoms. This bond is defined by a competition between electron localization and delocalization, granting metavalent solids properties like moderate electrical conductivity, high optical dielectric constant, large Born effective charge, and strong lattice anharmonicity. These features are ideal for thermoelectrics, which require high electrical conductivity, a high Seebeck coefficient, and low thermal conductivity. A chemical bonding map, based on quantum mechanics, can classify bonding types and guides the discovery of new thermoelectric materials. Moreover, the thermoelectric performance of metavalent solids can be tailored by doping, which adjusts electronic states or microstructures, providing additional ways to control electron and phonon transport. Lastly, tailoring MVB at defects like grain boundaries presents new opportunities for thermoelectric design. Overall, MVB offers significant potential for breakthroughs in thermoelectric materials.