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Water electrolysis to produce H2 is a promising strategy for generating a renewable fuel.However,the sluggish-kinetics and low value-added anodic oxygen evolution reaction(OER)restricts the overall energy conversion efficiency.Herein we report a strategy of boosting H2 production at low voltages by replacing OER with a bioelectrochemical cascade reaction at a triphase bioanode.In the presence of oxy-gen,oxidase enzymes can convert biomass into valuable products,and concurrently generate H202 that can be further electrooxidized at the bioanode.Benefiting from the efficient oxidase kinetics at an oxygen-rich triphase bioanode and the more favorable thermodynamics of H2O2 oxidation than that of OER,the cell voltage and energy consumption are reduced by～0.70 V and～36％,respectively,relative to regular water electrolysis.This leads to an efficient H2 production at the cathode and valuable product generation at the bioanode.Integration of a bioelectrochemical cascade into the water splitting process provides an energy-efficient and promising pathway for achieving a renewable fuel.