报告题目：Concepts, models, and impedance of electric double layers

报告人：黄俊教授

报告时间：2023年5月13日（周六）14：30

报告地点：电化学楼Z510

报告人简介：黄俊，德国于利希研究中心亥姆霍兹青年课题组长，德国亚琛工业大学初级教授。2012年获清华大学车辆工程学士学位，2017年获该校博士学位。2017-2019年，任中南大学特聘副教授，独立开展研究工作。2020-2022年，受洪堡基金会资助，依次访问了德国于利希研究中心、德国乌尔姆大学和西班牙阿利坎特大学，漫步理论电化学的小花园。

报告摘要：The interface between a metal and an electrolyte solution is termed an electric double layer (EDL), so named because the metal and electrolyte solution phases are usually loaded with charge of the same magnitude but opposite signs. It is the very place where electrochemical reactions, which are key to securing sustainable and clean energy, occur. Understanding the EDL is a long-standing problem in electrochemistry, for it is a nanoscale, mixed quantum-classical, open system that is situated, in terms of methodical challenges, at the border of atomistic and continuum theoretical approaches.

In this talk, I will begin with introducing basic concepts of EDLs, including double-layer capacitance, surface charge, potential of zero charge, chemisorption, etc. Then, I will present a recent conceptual model of a prototypical EDL formed between a Pt(111) electrode and an aqueous solution. This model will be related to earlier models and recent experimental data. Afterwards, I will introduce a constant-potential, computationally efficient theoretical method for modelling EDLs, namely, the so-called density-potential functional theory, that is under development in my group. Finally, I will discuss transfer functions of EDLs, focusing on the electrochemical impedance response. It will be shown that the impedance of a deceptively simple EDL is richly complex.