Fig. 5: Enhanced proton transport and pH regulation at higher applied currents in the hydrogen chambert. | Communications Materials

Fig. 5: Enhanced proton transport and pH regulation at higher applied currents in the hydrogen chambert.

From: Energy-efficient modular water purification system via concurrent freshwater and hydrogen generation using ion concentration polarization

Fig. 5: Enhanced proton transport and pH regulation at higher applied currents in the hydrogen chambert.The alternative text for this image may have been generated using AI.

pH changes in the hydrogen chamber of the mesoscale device as a function of applied currenFor the 20ā€‰mM feed saltwater condition, the total charge passed through the system was kept constant by adjusting the application time for each current. The measured pH values in the hydrogen chamber (red triangles) and the calculated OHāˆ’ ion concentrations (purple circles) are shown. The observed pH decreased in the hydrogen chamber at higher applied currents, despite similar hydrogen production levels, indicates enhanced H+ ion transport through the CEM. Data are presented asĀ the meanā€‰Ā±ā€‰standard deviation from measurements on 4 different devices.

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