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Usingmicroorganisms as a biocatalyst in the cathode ofbioelectrochemicalsystems(BESs)has been a novel alternative for hydrogen production.To promote the rate and recovery of cathodic hydrogen by biocatalysts in BESs,we constructed a modified biocathode based on Electrochemically Reducing Graphene Oxide(ERGO)and assessed the performances of the biocathode by setting different cathode potential.