▎ 摘　　要

It is very promising and challenging to design electrocatalysts with high activity for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Graphene-like germanium carbide (g-GeC) is a new candidate in the field of electrocatalysis due to its stable structure, high specific surface, and adjustable electronic properties. In this work, we systematically studied the electrocatalytic activities to-wards ORR, OER, and HER of the 3d, 4d, and 5d transition metal atom doped g-GeC (M-GeC). According to the scaling relations between binding energies of *OOH and *O as the function of *OH binding strength, conclusion can be made that M-GeC with strong binding strength of *OH tend to show strong binding strength of *O and *OOH. For ORR, the calculated overpotentials show that the catalytic activity of g-GeC is effectively improved after the introduction of Ag and Au, and the eta(ORR) values of Ag-GeC and Au-GeC are 0.44 and 0.46 V, respectively. For OER, Pd-GeC and Ni-GeC are determined as highly active catalysts with low eta(OER) values of 0.41 and 0.55 V, respectively. For HER, the Delta G(*H) value of Mn-GeC is calculated as-0.04 eV, which is very close to the optimal value of 0 eV.