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129th General Meeting of Korean Chemical Society & Exposition Thiol based Self-assembled monolayers on Zinc anodes for dendrite-free and stable plating and stripping in aqueous zinc-ion batteries

Submission Date :
2 / 28 / 2022 , 14 : 12 : 34
Abstract Number :
129022827068
Presenting Type:
Poster Presentation
Presenting Area :
Material Chemistry
Authors :
Manasi Mwemezi, Myoungho Pyo1,*
Printed electronics, Suncheon National University, Uganda
1Department of Advanced Components and Materials Engineering, Suncheon National University, Korea
Assigned Code :
MAT.P-676 Assigend Code Guideline
Presenting Time :
April 14 (THU) 11:00~13:00
Repeated charge/discharge in aqueous zinc-ion batteries (ZIBs) commonly results in surface corrosion/passivation and dendrite formation on zinc anodes, which are major challenges for the commercialization of zinc-based batteries. In this work, a self-assembled monolayer on zinc metal is described as a viable anode for ZIBs. A mercaptoundecanoinc acid which is spontaneously adsorbed on Zn surface is seen to suppress both dendrites and other side reactions in ZIBs. This is aided by the densely packed alkyl chains which prohibit direct contact of H2O and H+ with underlying Zn, and surface carboxylate moieties (-COO-) effectively repel anionic species (OH-) in a solution, which renders a Zn anode inert against zincate formation. At the same time, the electrostatic attraction between surface-carboxylates and cations increases the concentration of Zn2+ on the modified Zn surface to facilitate Zn plating/stripping with less overpotentials. As a result, zinc modified by a monolayer shows excellent stability during prolonged Zn plating/stripping.