The invention belongs to the technical field of
electrochemistry, and relates to a preparation method of an impregnation type mono-atomic iron-
carbon layer modified
nickel based or
cobalt based
composite material electrode. The preparation method comprises following steps: preparing an
ethanol solution of
tannic acid and an
ethanol solution of
ferric nitrate; slowly and dropwise adding the ferricnitrate solution into the
tannic acid solution to form a
colloidal solution; soaking a substrate material into the
colloidal solution, wherein the substrate material is
nickel based or
cobalt based
carbon paper, carbon cloth, electroconductive glass or a stainless steel net; taking out the substrate material, mixing the substrate material with a
sulfur source, a
phosphor source, or a
nitrogen source, (or no other
raw material is added), burning the substrate material for 0.5 to 4 hours under the protection of
inert gas, and cooling. The raw materials are cheap, nontoxic and easily available, the operation is easy and simple, multiple substrates can be painted and impregnated, the reaction time is short, and industrialization is easy. The prepared
composite material electrode has a good morphology maintaining performance, good electrochemical properties, and high stability, and can be applied to electrocatalytic
decomposition of water to prepare
oxygen. The prepared
composite material can be used as the positive pole for electrocatalytic
decomposition of water; and the over-potential is 280 mV, when the
current density is 40 mA / cm<-2>.