The 20th International Symposium on Electroanalytical Chemistry was held at Changchun Institute of Applied Chemistry from August 12 to 15, 2025. Professor Wen-Bin Cai attended the conference and gave an invited speech entitled 'Extending in situ Surface Enhanced Infrared Absorption Spectroscopy to Investigate Interfacial Adsorption and Functionality of Additives for Superconformal Copper Electrodeposition'.