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Hydrogen Generation by Electrochemical Reforming of Bioalcohols
handle: 20.500.14243/387312
The production of hydrogen by the electrolysis of water is a well-established technology. However, it does not have a significant commercial impact due to its high-energy cost. A traditional Proton Exchange Membrane (PEM) electrolyzer needs more than 45 kWhkgH2-1 to achieve a significant rate of hydrogen production. This is the main reason why water electrolysis accounts for only a small proportion of the world's hydrogen production (circa 4%). Since the thermodynamic barrier of water electrolysis consumes 68% of the whole energy input of the device, our strategy for reducing the energy cost is the replacement of the unfavorable anodic oxygen evolution reaction with a more suitable reaction: the partial oxidation of a bioalcohol to a carboxylate. This process needs only 20 kWh for the evolution of one kilogram of hydrogen at the same working conditions of traditional PEM electrolyzers, with a net energy saving of about 44%. Such electrolytic processes that lead to the concomitant generation of hydrogen and industrially relevant chemicals, like acetate and lactate, are often indicated as "electrochemical reforming", or "electroreforming". In order to obtain selective oxidation of alcohols to carboxylic compounds of interest to the fine chemical industry, several anodic catalysts have been investigated, ranging from nanostructured palladium catalysts to rhodium organometallic compounds.
green chemistry, hydrogen, electrolysis, electrocatalysis, renewable energy
green chemistry, hydrogen, electrolysis, electrocatalysis, renewable energy
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