▎ 摘　　要

Fabrication of non-noble-metal electrocatalysts that are competent, cheap, and highly stable for hydrogen evolution reaction (HER) has persisted a great challenge in the field of renewable energy research over the years. In this study, facile one-step fabrication strategy was adopted in synthesizing Co@N-G materials for the first time. Simultaneous fabrication of Co@N-G was achieved by simplistic one-pot synthesis strategy through the catalytic mixture of cobalt (II) nitrate hexahydrate, urea, fumaric acid, and sodium carbonate which were pyrolytically treated at appreciable temperature ranges. The as-fabricated nanoparticles display outstanding morphological/electrocatalytic properties benefitting from the synergistic and formative relationship between Co atom and defective N-doped graphene, mass electron transfer support, abundant active sites and unique morphology exhibited by the as-prepared nanoparticles. A medium overpotential of 0.26 V with a time-dependent stability of 40 hours were enough to achieve the current density of 10 mA cm(-2) in basic electrolyte. However, the simplistic fabrication strategy is fascinating to scale up easy processes in designing HER electrocatalysts.