激进的
化学
氢
光化学
氧气
电解质
阳极
质子交换膜燃料电池
分子
化学反应
铂金
阴极
无机化学
催化作用
电极
物理化学
有机化学
标识
DOI:10.1016/j.ijhydene.2021.12.240
摘要
Hydrogen and oxygen are combined to water by a chain reaction. In proton-conducting fuel cells the electrolyte membrane is placed between the first and the second link. The formation of water is completed by chemical reactions not contributing to the voltage establishment, but only to the thermal balance. Thus the Equilibrium Potential "EP" cannot be based on the overall molecular reaction 2H2 + O2 => 2H2O yielding an EP of 1.23 V, but another reactions must be considered. Hydrogen radicals are formed by platinum inside the anode chamber. Radicals reappearing at the cathode either recombine to hydrogen molecules or split oxygen molecules and form hydroxyl radicals. Platinum is needed at the cathode to secure a steady supply of hydrogen radicals. Water is obtained by chemical oxidation of hydroxyl radicals. Two EPs are obtained for hydrogen recombination (measurable) and hydrogen partial oxidation (virtual). Also, two polarity change steps must be considered in the EP equation. With these modifications an excellent agreement between theory and experiment is obtained.
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