Design principles for water dissociation catalysts in high-performance bipolar membranes.

ABSTRACT: Water dissociation (WD, H₂O → H⁺ + OH^-) is the core process in bipolar membranes (BPMs) that limits energy efficiency. Both electric-field and catalytic effects have been invoked to describe WD, but the interplay of the two and the underlying design principles for WD catalysts remain unclear. Using precise layers of metal-oxide nanoparticles, membrane-electrolyzer platforms, materials characterization, and impedance analysis, we illustrate the role of electronic conductivity in modulating the performance of WD catalysts in the BPM junction through screening and focusing the interfacial electric field and thus electrochemical potential gradients. In contrast, the ionic conductivity of the same layer is not a significant factor in limiting performance. BPM wa

SUBMITTER: Chen L 

PROVIDER: S-EPMC9253156 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature