Decoupling hydrogen production from water oxidation by integrating a triphase interfacial bioelectrochemical cascade reaction

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 164-169
• 页数: 6页
• 语种: 英文

摘要

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.