3D Printed Membraneless Water Electrolysis Cells
Here we present novel device architectures for water splitting which utilizes additive manufacturing (e.g. - 3D printing) to produce hydrogen and oxygen gas with minimal product crossover. Additive manufacturing has the benefits of: low-cost, ability to rapidly prototype, and use renewable materials (e.g. – poly(lactic acid)).3 In our design, a flowing electrolyte solution impinges upon two electrodes, which are placed in close proximity to minimize solution resistance (measured to be ~3 Ω in 0.25 M H2SO4). The low Ohmic losses enable current densities up to 300 mA cm-2, and can be used in acidic, basic and neutral electrolytes because no membrane is required. The product gas streams are separated by a thin divider placed downstream of the electrodes, so that product crossover is essentially zero. The results compare well with previously reported studies,4 but eliminate the complicated processing times and device complexities required.
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