Employment of low-crystalline structures or introduction of structural deficiencies emerges as an attractive strategy to generate abundant active sites and to facilitate the intrinsic reaction kinetics, thereby regulating the electrocatalytic activities of many catalysts. To fundamentally understand the origin of the catalytic activities of L-CoS, we performed the HER and OER tests in different media, as well as for Co3O4-ZIF and Co-LDH references.