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Cif Sstms,. nc. The reaction occurring at the anode and cathode of the electrolysis cell with an alkaline electrolyte are: Cathode Anode 2e +2H20=H2 +OH (1) 20H =H20+1/202+2e (2) resulting in the overall net reaction of electrical energy + H20 = H2 + 1/2 Schematically, these reactions are shown electrolyzed is supplied via the cathode 02 + heat (3) on the diagram below. The water to be side of the cell. The water components (x + y)(H 0) not included in the electrochemical reaction represent the water required for humidification of the cathode and anode gases at the pressure, temperature and local concentration of the aqueous electrolyte at the electrodes. 2e H2 Cathode ///Anode 2H20 _2 xH20 (x+y)(H20) 2e The reactions show that an electrolyte concentration gradient must exist due to the production of water at the anode and consumption at the cathode. The magnitude of this gradient is a function of the characteristics and configuration of the electrodes and cell matrix and the current density. For calculations of humidification requirements the equivalent concentrations of the electrolyte at the respective cell electrode must be used which differ both from the initial charge concentration and from anode to cathode side. 8 02 yH20 Electrolyte Filled MatrixPDF Image | WATER ELECTROLYSIS MODULE
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