effects at electodes on passage of current by the process of electrolysis of water
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Creating an electric potential through water causes positive ions, including the inherent hydrogen ions H3O+, to move towards the negative electrode (cathode) and negative ions, including the inherent hydroxide ions OH-, to move towards the positive electrode (anode). With a sufficient potential difference, this may cause electrolysis with oxygen gas being produced at the anode and hydrogen gas produced at the cathode (see [1878] for current reviews). The electrolysis of water usually involves dilute, or moderately concentrated, salt solutions to reduce the power loss driving the current through the solution, but the presence of salt is not a requirement for electrolysis.
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