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ChemInform Abstract from 0.5 M H2SO4 solution is studied using cyclic voltammetry, chronoamperometry, and chronopotentiometry combined with SEM observation. Pt4+ is reduced at the C-fibers, produced by graphitization of polyacrylonitrile, in two well-defined two-electron irreversible steps. The deposition mechanism involves instantaneous nucleation with hemispherical growth. The Pt deposits from acid solutions are firmly attached on the fibers, exhibiting their catalytic activity for H2 and O2 evolution even at low surface concentrations.