A percolating network of high electrical conductivity needed to operate electrodes at high currents can be formed by in-situ reduction of Ag+ originating from mixed metal oxide lattices. Candidates for this mechanism compared for the first time here are spinel Ag2MoO4, monoclinic and triclinic Ag2Mo2O7, and Ag2Mo3O10-2H2O, which have reduction potentials for Ag+ and Mo6+ decoupled by ~600 mV in aqueous zinc-ion electrolyte. Under these conditions, Ag0 is the first reduction product and a decrease of charge transfer resistance by ~100x is observed within 2.5% consumption of total Ag+ independent of initial structure. However, resistance metrics alone poorly describe materials which are robust to reducing silver with high energy at faster rates. This talk will discuss the underlying factors contributing to the size of Ag0 produced, the ability to predict which molybdates remain highly functional in absence of any electrode additives, and the trends best predicting robustness to changes in rate.

Reduction of silver ions in molybdates: A combined microscopy and primary electrochemistry study towards understanding aqueous reductive displacement mechanisms

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.