Title:Charge Transfer at Soft Matter Interfaces and Ion Sensing

Speaker:Professor Niu Li(Professor at Sun Yat-sen University)

Time:June 9,2025(Monday)2:30 PM–5:00 PM

Venue:Room 214,Building 16,School of Chemistry and Chemical Engineering

Inviter:Professor Liu Jinbin

Organizing Unit:School of Chemistry and Chemical Engineering

Speaker Profile:

Professor Niu Li is a Level 2 Tenured Professor(Ph.D.Supervisor)at Sun Yat-sen University and a Level 2 Professor(Master's Supervisor)at Guangzhou University.He is a recipient of the Chinese Academy of Sciences Hundred Talents Program,the National Distinguished Young Scientist Fund,the National Ten Thousand Talents Program,and a government special allowance.His research focuses on photoelectrically sensitive functional nanostructured materials,material surface and interface design,photoelectrochemical sensors,and the design of analytical instruments.He has received numerous awards,including the First Prize for Scientific and Technological Progress in Jilin Province,the First Prize for Contributions from the Chinese Overseas Community,the Outstanding Contribution Award in Chinese Chemical Sensors,and the Guangzhou Science and Technology Innovation Nanshan Award.

Abstract:

A Frumkin thermodynamic factor for electron transfer at liquid-liquid interfaces has been proposed.It is suggested that the potential at the liquid-liquid interface only changes the concentration of species at the interface,thereby inducing the concentration effect of the electrical double layer.This theory unifies the diverse results of electron transfer rates and interfacial potential relationships.The research has evolved from the traditional single-polarized liquid-liquid interface in a four-electrode system to a dual-polarized liquid/liquid interface system.By employing the electron transfer-ion transfer(ET-IT)mechanism,the challenge of potential window limitations has been overcome,significantly expanding the application scope of ion voltammetric analysis.At soft matter interfaces,not only has the design,construction,and growth of nanostructured materials been achieved,but also multiple ion-sensing functions have been endowed to the tailored and modified soft matter interfaces.Various solid-state ion potential sensing systems have been constructed using multiple nano-composite components,and a simple membrane-free solid-state ion sensing technology has been developed.Multiple ion-sensing measurement methods have been introduced,and various engineering techniques for constructing ion sensors have been integrated to explore the multi-scenario applications of ion sensing.