Water decomposition, hydrogen generation

The hydrogen generation and the decomposition of water (as an essential part of the electrolyte) during charging periods shall be considered in more detail under lead-acid accumulators. 

The water and hydrogen line shapes generated by the TPRn of a 0.6% water in helium stream on a potash promoted catalyst are shown in Figure 4. These data indicate that no water decomposition occurred on this catalyst surface at temperatures of less than 400 C. However, above this temperature hydrogen was produced, A similar reaction profile was observed on an alkali free nickel catalyst ... 

Membrane electrolyzers for water decomposition use cation exchange membranes of the type used in the chlor-alkali membrane process, in this case made H+-ion conducting by different pretreatment. So, the ions generated at the anode (H2O -> 2H++ I/2O2 + 2e ) pass through the membrane and form at the cathode hydrogen (2H+ + 2e -> H2). 

When polymer solution is irradiated, water chiefly absorbs the energy of the radiation, and water decomposition, which is hydrated electron, OH radical, and hydrogen atom, proton, etc, are generated in the solution[reaction (2)]. These radicals having a high reactivity cause various chemical reactions in the solution. 

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