Greenfield
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Once additional process is underpotential deposition (UPD). This occurs when the substance being plated onto the electrode, initially (the first mono-layer) deposits at a lower potential (less energy required) than the expected equilibrium potential (redox potential). This is due to more favorable interactions with the "foreign" surface, over the elements own surface. For example, Cu will deposit on a Pt electrode before it would deposit on an electrode made of itself (Cu).
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HER and OER
in Chemistry
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A nice and simple text book is: Christine Lefrou, Pierre Fabry, Jean-Claude Poignet, Electrochemistry, The Basics, With Examples.
The first chapter has information on OER and HER.