A cellulose membrane was embedded into polydimethylsiloxane elastomer with two wells carved on either side to serve as reservoirs for the electrolyte solution. The cellulose nanofluidic membrane was immersed in electrolyte for at least 1 day before measurement. Two homemade Ag/AgCl electrodes were inserted into the reservoirs. BioLogic from Science Instrument was used to record the current signal while providing the voltage source at a scanning rate of 10 mV s−1.

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