报告人：Yanfeng Zhang

报告时间：2025年10月28日（星期二）下午14:30~15:00

报告地点：新能源大楼附楼102会议室

报告摘要：

Metallic transition metal dichalcogenides (MTMDCs) have manifested many intriguing properties in their bulk states, such as magnetism, charge density wave, and superconductivity. To propel the related applications, our group have reported the direct syntheses of high-quality VX₂, NbX_2, TaX_2, NiX₂, etc., related MTMDCs materials on conducting Au foils and nanoporous gold, graphene, insulating NaCl powder substrates, etc.^. Particularly, we have obtained thickness-tunable 2H-TaS₂flakes and centimeter-size ultrathin films on an electrode material of Au foils. Extra high hydrogen evolution reaction (HER) efficiency was demonstrated on the CVD-grown 2H-TaS₂/Au foils. The first synthesis of vertically oriented 1T-TaS₂ nanosheets were also reported on nanoporous gold (NPG) substrates. For scalable production, a universal synthetic route was also developed for achieving high-quality 2D MTMDC (e.g., TaS₂, V₅S₈, and NbS₂) nanosheets using microcrystalline NaCl crystals as templates via a facile CVD route.This synthetic route is perfectly compatible with a facile water dissolution−filtration process for obtaining high-purity MTMDC nanosheets powders towards high-performance energy-related applications.

Recently, on low-cost carbon nanotube (CNT) film substrates, the scalable synthesis of vertically-oriented 2H-NbS₂ nanosheets is also reported by a facile CVD route.3D vertically-oriented 2H-NbS₂ nanosheets present abundant edge active sites and strong interface coupling with CNT thus possessing exceptional mechanical stability, as well as decent HER property, with remarkably low overpotentials of ~55 mV at 10 mA cm⁻² and ultra-high exchange current density of ~1445 μAcm⁻², and negligible performance degradation after 200 h operation at the large current density, which are superior to those of other TMDCs-based catalysts.^[5] These work are expected to provide novel perspectives for the batch synthesis and application of 3D MTMDCs-based electrocatalysts with greatly improved electrocatalytic performance and stability that are needed for practical applications.

报告人简介：

Yanfeng Zhang received her PhD from the Institute of Physics in the Chinese Academy of Sciences in 2005. Later on, she worked as a JSPS fellow from 2006 to 2009 in Tohoku University, Japan. In 2010, she joined the Department of Materials Science and Engineering in the College of Engineering of Peking University, and Center for Nanochemistry of Peking University, and served as a professor.

Her research interests relate to the controlled growth, accurate characterization and novel property exploration of two-dimensional layered materials such as graphene, h-BN–graphene heterostructures, and transition metal dichalcogenides (TMDCs) and their heterostructures. Prof. Zhang has published over 270 papers in Science, Nat. Commun., Adv. Mater., etc. in her research career. All the papers are non-self-cited by over 5000 times. In 2012, she won the support of “National Natural Science Foundation for Excellent Young Scholar” from the National Natural Science Foundation of China (NSFC). In 2019, she won the support of “National Natural Science Foundation for Distinguished Young Scholar” from NSFC. She was also enrolled in the “Youth Project of the Yangtze River Scholar” in 2015.