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- W4283800794 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 water electrolyzers, optimized via these findings, use ~30-nm-diameter anatase TiO2 as an earth-abundant WD catalyst, and generate O2 and H2 at 500 mA cm-2 with a record-low total cell voltage below 2 V. These advanced BPMs might accelerate deployment of new electrodialysis, carbon-capture, and carbon-utilization technology." @default.
- W4283800794 created "2022-07-05" @default.
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- W4283800794 date "2022-07-04" @default.
- W4283800794 modified "2023-10-01" @default.
- W4283800794 title "Design principles for water dissociation catalysts in high-performance bipolar membranes" @default.
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- W4283800794 doi "https://doi.org/10.1038/s41467-022-31429-7" @default.
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