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Microbial electrolysis cells (MECs) are perceived as a potential and promising innovative biotechnological tool that can convert carbon-rich waste biomass or wastewater into hydrogen (H₂) or other value-added chemicals. Undesired methane (CH₄) producing H₂ sinks, including methanogens, is a serious challenge faced by MECs to achieve high-rate H₂ production. Methanogens can consume H₂ to produce CH₄ in MECs, which has led to a drop of H₂ production efficiency, H₂ production rate (HPR) and also a low percentage of H₂ in the produced biogas. Organized inference related to the interactions of microbes and potential processes has assisted in understanding approaches and concepts for inhibiting the growth of methanogens and profitable scale up design. Thus, here in we review the current developments and also the improvements constituted for the reduction of microbial H₂ losses to methanogens …