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The hydrogen evolution reaction (HER) is a key electrochemical process occurring at the cathode during water splitting or in acidic media. It involves the reduction of protons to form molecular hydrogen. The reaction typically proceeds through multiple mechanistic steps, which depend on the electrode material and the electrolyte. The first step is the Volmer step, which involves the adsorption of a proton onto the electrode surface and its reduction to ________ ____ ________ _____ __________.
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