On the use of 3-D electrodes and pulsed voltage for the process intensification of alkaline water electrolysis
(2019) International Journal of Hydrogen Energy — Vol. 44, p. 29432-29440 (2019)
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- In this work, the potential of process intensification of alkaline water electrolysis has been studied when using 3-D nickel electrodes. First of all, it was shown that such macro-porous, 3- D electrodes, when used in combination with forced electrolyte flow, can have a strong impact on the hydrogen generation performance of the process. For optimal conditions of the imposed Reynolds numbers of both the catholyte and anolyte flow, a 45 % increase in current was measured as compared to state-of-the-art 2-D electrodes for a cell potential of 2 V, the latter being a typical value for industrial electrolysers. For the 2-D electrodes, forced flow did not induce any significant improvement. Secondly, the use of pulsed electrical power has been studied as well, with pulse widths in the range 2 - 200 ms. A significant synergistic effect was observed when using 3-D electrodes in combination with both forced flow and pulsed voltage, allowing in the case of 2 ms pulses an almost fivefold increase in current at 2 V.
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de Radiguès de Chennevières, Q., Thunis, G., & Proost, J. (2019). On the use of 3-D electrodes and pulsed voltage for the process intensification of alkaline water electrolysis. International Journal of Hydrogen Energy, 44, 29432-29440. https://hdl.handle.net/2078.5/127404 (Original work published 2019)