报告题目：利用催化微乳液聚合设计超小尺寸和结构性能的

        碳纳米球

        报 告 人：康科迪亚大学（加拿大蒙特利尔） 叶志斌 教授

        报告时间：2023年12月21日（星期四）上午10:00

        报告地点：莫干山校区图书馆B510会议室

        邀 请 人：高分子材料与工程研究所 徐立新 教授

报告人简介：

Zhibin Ye is a Professor at Department of Chemical and Materials Engineering of Concordia University (Montreal, Canada).  He received his Bachelor and Master’s degrees from Zhejiang University (China) in 1996 and 1999, respectively, and his PhD degree from McMaster University in 2004, with all in chemical engineering.  He started his independent academic career as an Assistant Professor at Laurentian University in 2004, and was promoted to Associate Professor and Professor in 2009 and 2012, respectively, at Laurentian.  He moved to Concordia University in 2017. Zhibin has research interest in organic electrode materials for rechargeable batteries and supercapacitors, carbon nanomaterials, 2D materials, polymers, advanced polymerization techniques, catalysis, nanocomposites, etc. He received research awards, including Canada Research Chair, Canadian Catalysis Lectureship Award from Catalysis Division of Chemical Institute of Canada, Concordia Provost’s Circle of Distinction, Ontario Premier’s Early Researcher Award, Laurentian University Faculty of Science and Engineering Research Excellence Award, and NSERC DAS Award. Zhibin was inducted as a Fellow of Royal Society of Chemistry (UK) in 2016.

报告内容摘要：

To date, a large family of carbon-based materials has been developed for various electrochemical energy storage applications because of their low cost, stable physicochemical properties, and good conductivity. However, kinetic problems still restrict their applications in the high-rate energy storage systems arising from restricted inner-pore ion transport, particularly within micropores (d < 2 nm) and small mesopores (2<d<5 nm). Herein, we demonstrate the efficient design of ultrasmall porous carbon nanospheres with tailored sizes (5?40 nm in diameter) and optimized intra-inter-sphere textural properties for high-rate high-energy lithium-sulfur batteries and supercapacitors. The porous carbon nanospheres are synthesized via a facile, convenient, and scalable catalytic miniemulsion polymerization strategy followed by simple KOH activation. Specially, the intra-sphere micropore dominated carbon nanospheres prepared with single-step activation display the superior performances as conducting reservoirs for sulfur in lithium-sulfur batteries to efficiently alleviate the polysulfide dissolution problems. Furthermore, an optimum dual-step activation facilitates the expansion of intra-sphere micropores into an enlarged hierarchical intra-sphere micro-/meso-pore, rendering ultrasmall carbon nanospheres as high-rate electrode materials for electrical double-layer capacitors for lithium-ion batteries with significantly enhanced ion transports. Moreover, a further increase in rate performance is seen upon a decrease in sphere size from 40 to 5 nm in these applications, confirming the pronounced size effects due to the shortened ion diffusion distances. With their well-defined ultrasmall sizes and controllable intra-/inter-sphere pore structures, we have been able to reveal the important effects of these structural parameters on the electrochemical performances of this class of ultrasmall carbon nanomaterials. Such relationships provide valuable guidelines for the rational design of carbon nanomaterials for high-rate high-density energy storage applications.