Direct Alcohol Fuel Cells: A Comparative Review of Acidic and Alkaline Systems

Enrico Berretti , Luigi Osmieri , Vincenzo Baglio , Hamish A. Miller , Jonathan Filippi , Francesco Vizza , Monica Santamaria , Stefania Specchia , Carlo Santoro , Alessandro Lavacchi

Electrochemical Energy Reviews ›› 2023, Vol. 6 ›› Issue (1)

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Electrochemical Energy Reviews ›› 2023, Vol. 6 ›› Issue (1) DOI: 10.1007/s41918-023-00189-3
Review Article
Direct Alcohol Fuel Cells: A Comparative Review of Acidic and Alkaline Systems
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Abstract

In the last 20 years, direct alcohol fuel cells (DAFCs) have been the subject of tremendous research efforts for the potential application as on-demand power sources. Two leading technologies respectively based on proton exchange membranes (PEMs) and anion exchange membranes (AEMs) have emerged: the first one operating in an acidic environment and conducting protons; the second one operating in alkaline electrolytes and conducting hydroxyl ions. In this review, we present an analysis of the state-of-the-art acidic and alkaline DAFCs fed with methanol and ethanol with the purpose to support a comparative analysis of acidic and alkaline systems, which is missing in the current literature. A special focus is placed on the effect of the reaction stoichiometry in acidic and alkaline systems. Particularly, we point out that, in alkaline systems, OH− participates stoichiometrically to reactions, and that alcohol oxidation products are anions. This aspect must be considered when designing the fuel and when making an energy evaluation from a whole system perspective.

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Enrico Berretti, Luigi Osmieri, Vincenzo Baglio, Hamish A. Miller, Jonathan Filippi, Francesco Vizza, Monica Santamaria, Stefania Specchia, Carlo Santoro, Alessandro Lavacchi. Direct Alcohol Fuel Cells: A Comparative Review of Acidic and Alkaline Systems. Electrochemical Energy Reviews, 2023, 6 (1) : DOI:10.1007/s41918-023-00189-3

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Ministero dell’Istruzione, dell’Università e della Ricerca(2017YH9MRK)

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