Electrochemical hydrogen production from thermochemical cycles using a proton exchange membrane electrolyzer

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• 作者：PremKumar Sivasubramanian ; Ramaraja P. Ramasamy ; Francisco J. Freire ; Charles E. Holl ; ; John W. Weidner
• 关键词：Hydrogen ; Nuclear hydrogen ; Thermochemical
• 刊名：International Journal of Hydrogen Energy
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：32
• 期：4
• 页码：463-468
• 全文大小：281 K

文摘

The electrochemical step in two thermochemical cycles for hydrogen production is reported. One cycle involves the electrochemical oxidation of sulfur dioxide to sulfuric acid (both water and SO₂ are reactants). The other cycle involves the oxidation of anhydrous hydrogen bromide to bromine (anhydrous HBr is the only reactant). In both cycles, protons are reduced at the cathode to produce hydrogen. The novelty of this work is that both anode reactions are carried out in the gas phase of a proton exchange membrane (PEM) electrolyzer, which enhances the transport rate of reactants to the electrode surface. The HBr process achieved at 1.91 V. The SO₂ process reached , but behind this current density the cell experienced mass transfer limitations of water across the membrane. However, the voltage required to achieve was 0.835 V, compared to 1.025 V for the HBr process at this current density.