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Theoretical thermal water splitting efficiencies. [11]60% efficient at 1000°C Steam reforming of hydrocarbons to hydrogen is 70-85% efficient [12]. High temperature electrolysis is more efficient economically than traditional room-temperature electrolysis because some of the energy is supplied as heat, which is cheaper than electricity, and also because the electrolysis reaction is more ...
Electrolysis of water at 298 K (25 °C) requires 285.83 kJ of energy per mole in order to occur, [6] and the reaction is increasingly endothermic with increasing temperature. However, the energy demand may be reduced due to the Joule heating of an electrolysis cell, which may be utilized in the water splitting process at high temperatures.
Less electricity is required for electrolysis process in solid oxide regenerative fuel cells (SORFC) due to high temperature. The electrolyte can be O 2− conducting and/or proton (H + ) conducting. The state of the art for O 2− conducting yttria stabilized zirconia (YSZ) based SORFC using Ni–YSZ as the hydrogen electrode and LSM (or LSM ...
No water management for humidification of the membrane is needed compared to LT-PEM fuel cell. [9] Waste heat of the stack (130 to 180 °C) can be used making combined heat and power (CHP) possible for further usage of the heat in contrast to LT-PEM fuel cell which has too low waste heat temperature below 80 °C. [10]
Pure water has a charge carrier density similar to semiconductors [12] [page needed] since it has a low autoionization, K w = 1.0×10 −14 at room temperature and thus pure water conducts current poorly, 0.055 μS/cm. [13] Unless a large potential is applied to increase the autoionization of water, electrolysis of pure water proceeds slowly ...
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More than 352 thermochemical cycles have been described for water splitting by thermolysis. [21] These cycles promise to produce hydrogen and oxygen from water and heat without using electricity. [22] Since all the input energy for such processes is heat, they can be more efficient than high-temperature electrolysis.
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