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Amorphous molybdenum sulfide is an attractive electrode material for Li/Mg batteries and an efficient Pt‐free catalyst for the hydrogen evolution reaction in water. By using the electrochemical quartz crystal microbalance (EQCM) analysis, new insights were gained into the electrochemical polymerization of the [Mo3S13]2− cluster, which generates amorphous molybdenum sulfide thin films. In this work, it is shown that, at the anodic potential, a two‐electron oxidative elimination of the terminal disulfide ligand within the [Mo3S13]2− cluster induces the polymerization. A reductive elimination of the terminal disulfide ligand also occurs at the cathodic potential, inducing the polymerization. However, in sharp contrast to the anodic polymerization, according to which the film growth is rapid, the cathodic polymerization competes with the electrochemical reductive corrosion of the readily grown film, therefore occurring at a significant lower growth rate.

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