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High-temperature electrolysis (also called steam electrolysis) is the water electrolysis at temperatures that ranged between 700 and 1,000 °C in which electrical energy is the driving force of water splitting to produce oxygen (O2) and hydrogen (H2). The core of an electrolysis unit is an electrochemical cell, which is filled with pure water and has two electrodes connected with an external power supply. At a certain voltage, which is called critical voltage, between both electrodes, the electrodes start to produce hydrogen gas at the negatively biased electrode (Eq. 1) and oxygen gas at the positively biased electrode (Eq. 2). The amount of gases produced per unit time is directly related to the current that passes through the electrochemical cell (Wendt and Kreysa 1999)
CitationValderrama, C. High-temperature electrolysis. A: "Encyclopedia of Membranes". Berlín: Springer, 2016, p. 1-3.
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