Event CANCELED – Chemistry Dept. Special Seminar – Dr. Kingshuk Roy

About the event

Speaker:  Dr. Kingshuk Roy, Purdue University.

Host:  Dr. Liane Moreau

Title:  Realization, Quantification and Mitigation of Hydrogen Evolution Reaction for Stable Aqueous Zinc Metal Batteries

Abstract: Aqueous Zinc Metal Batteries (AZMBs) offer significant promise as an alternative to conventional Lithium-ion batteries due to their high capacity, cost-effectiveness, and safety. However, practical implementation faces challenges such as dendrite formation, hydrogen evolution reaction (HER), and passivation of the anode. Our studies are trying to address these issues. One study employs in-situ electrochemical mass spectrometry (ECMS) to quantify hydrogen evolution during Zn electrodeposition, revealing insights into its correlation with electrode morphology and long-term cyclability. Results highlight the importance of controlling HER for battery performance. A follow-up study investigates the kinetic origin of HER during Zn metal battery charging, revealing the intertwined nature of Zn electrodeposition and H2 liberation. The dominant role of solvated water in HER is emphasized, shedding light on pathways for stabilizing ZMBs through electrolyte modifications. Another study introduces a tetraalkylsulfonamide (TAS) additive designed to suppress HER and dendrite formation while enhancing cyclability. Experimental and theoretical analyses demonstrate TAS’s ability to alter Zn2+ solvation, leading to improved battery performance. Electrochemical and spectroscopic techniques confirm the effectiveness of TAS in suppressing HER and promoting uniform Zn deposition. Overall, these studies offer valuable insights into the mechanisms of HER, dendrite formation, and passivation in AZMBs, providing a foundation for the development of stable and efficient Zn metal batteries through electrolyte optimization and structural modifications.