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化工院:Electrochemical Mechanisms in Nano-Engineered Graphene Energy Materials

主题:Electrochemical Mechanisms in Nano-Engineered Graphene Energy Materials

时间:2019年4月15日 下午4:00

地点:化学生物学与纳米医学研究所202 室

主讲人:惠静姝 University of Illinois at Urbana

惠静姝,2007年至2011年就读于北京大学化学与分子工程学院。师从郭雪峰教授开展功能化有机场效应晶体管的研究。2012年赴美国伊利诺伊大学材料科学与工程专业攻读博士学位,师从Joaquín Rodríguez-López教授。主要研究方向为新型电化学储能以及转化体系的机理。2017年继续在伊利诺伊大学化学系Rodríguez-López教授组从事博士后的工作至今。在J. Am. Chem. Soc.,ACS Nano,Anal. Chem.,Electrochim. Acta 等国际顶级期刊杂志上发表学术论文18篇,专利1篇。

摘要:

One of the greatest challenges for our modern society is developing efficient and low-cost electrochemical energy storage and conversion systems for stationary and transportation applications. Understanding the detailed electrochemical mechanisms in energy-related materials with new designs and modification methods will help us break the ceiling of current existing systems. Ultrathin graphene materials exhibited exceptional electronic and electrochemical properties, which can be used as electronically transparent and physically impermeable interface. Oxygen reduction reaction activity changes demonstrate the electronic coupling between metal substrates and molecular adlayers above graphene. These results provide new strategies for systematically tuning the electrocatalytic reactivity using hybridized electrocatalyst structures for energy conversion devices. Furthermore, few layer graphene can be used as an ultrathin bulk materials for reversible alkali-ion (de-)intercalation. The finite thickness of graphene leads to layer number-controlled Li-ion intercalation behavior. Passivating the few layer graphene surface with Li-based solid-electrolyte interphase can selectively facilitate stable K-ion intercalation while suppressing the K plating reaction. These results help us understand the underlying mechanism of alkali-ion batteries, as well as inspire the design of better performance energy storage systems.

学术地点 化学生物学与纳米医学研究所202 室 主讲人 惠静姝 University of Illinois at Urbana
讲座时间 2019年4月15日 下午4:00
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