Decoupling water electrolysis using mediator is an interesting way to produce pure hydrogen. The present work validates the proof of concept of decoupled electrolyser associated with a bioelectrochemical system (MFC-DES) through a redox flow mediator (potassium hexacyanoferrate (KHCF)). Low voltage (1 V) hydrogen production was achieved with a current density up to 25 mA cm⁻². Regeneration of the mediator was performed by glucose fed microbial fuel cells. The oxidation rate of KHCF in the electrolyser is, at least, an order of magnitude higher than the reduction rate in MFC cascade fed system. MFC-DES is thus a promising set up as it desynchronizes limited microbial rate and hydrogen production, generate value from wastewater and reduce energetic cost of water electrolysis.

使用介体将水电解解耦是生产纯氢的一种有趣方法。本工作验证了通过氧化还原流介体（六氰合铁酸钾（KHCF））与生物电化学系统（MFC-DES）关联的解耦电解槽的概念验证。以高达25 mA cm ^-2的电流密度实现了低电压（1 V）氢气的生产。介体的再生是通过葡萄糖供入的微生物燃料电池进行的。电解槽中KHCF的氧化速率至少比MFC级联进料系统中的还原速率高一个数量级。因此，MFC-DES是有前途的设置，因为它使有限的微生物速率和制氢不同步，从废水中产生价值并降低水电解的能源成本。