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Unlocking the Scalability of Overlapping Electric Double Layers for Water Splitting
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AI
W
J
H
张
DOI：10.1021/acsenergylett.6c01492.png)
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Abstract
En 中文
Membrane-less pure water electrolysis with earth-abundant catalysts promises minimum-cost green hydrogen (H2) production, yet it faces kinetic and scalability barriers. Here, we present a scalable architecture that exploits overlapping electrical double layers (EDLs) within nanospaced electrodes. This nanoconfinement generates intense electric fields that facilitate in situ water ionization and create a bipolar acid–base reaction environment, bypassing the kinetic barriers of pure water splitting. We identify structural trade-offs that govern efficiency and scalability of the overlapping EDLs and develop an interdigitated reactor that balances voltage efficiency, mass transport, and current purity. This design suppresses pseudo-current and preserves overlapping EDL effects during geometric scaling. When integrated into a modular multi-chip system, this design yields a projected power density of 11.42 kW·kg–1, exceeding that of conventional electrolyzers by three orders of magnitude. This work bridges nanoconfinement physics and macroscopic engineering, enabling scalable green H2 production without membranes, supporting electrolytes, or precious metal catalysts.
Keywords:
Electrocatalysts
Electrodes
Electrolysis
Layers
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18.2
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