2018
DOI: 10.1149/2.0761807jes
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Determination of the Stoichiometry of Ethanol Oxidation from the Flow Rate Dependence of the Current in a Proton Exchange Membrane Electrolysis Cell

Abstract: Measurement of the stoichiometry of ethanol oxidation is crucial in the development of direct ethanol fuel cell technology because it determines how efficiently the fuel is used. Here, it has been determined in fuel cell hardware at 80 • C for various anodes prepared with commercial Pt/C, PtRu/C and PtSn/C catalysts. Average numbers of electrons transferred per ethanol molecule (n av ) obtained from the flow rate dependence of the current (electrochemical method) are critically compared with values obtained fr… Show more

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Cited by 5 publications
(8 citation statements)
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“…Moreover, according to Camara and Iwasita, CO 2 evolution is more pronounced at low EtOH concentrations (<0.1 M), with negligible acetaldehyde [8]. Recently, an effective PEM-based cell approach was established [55][56][57], which enables one to accurately determine the n av and stoichiometry of the EOR using the PEM electrolysis cell operated in crossover mode. The thick-film RDE technique that we used, and describe here, could nonetheless be used as an approach for quick catalyst screening.…”
Section: Electrochemical Measurementsmentioning
confidence: 99%
“…Moreover, according to Camara and Iwasita, CO 2 evolution is more pronounced at low EtOH concentrations (<0.1 M), with negligible acetaldehyde [8]. Recently, an effective PEM-based cell approach was established [55][56][57], which enables one to accurately determine the n av and stoichiometry of the EOR using the PEM electrolysis cell operated in crossover mode. The thick-film RDE technique that we used, and describe here, could nonetheless be used as an approach for quick catalyst screening.…”
Section: Electrochemical Measurementsmentioning
confidence: 99%
“…where the variation of the cathode overpotential with C O 2 ,cc and i c is given analytically by Eq. (9), while the explicit dependencies of the current densities i and i c as a function of C E,ac , C A,ac and η a result from the solution of the 1D anode model (see Appendix for details), which provides the output current density i and enables the computation of i c through Eqs (7), (18) and (19).…”
Section: Solution Proceduresmentioning
confidence: 99%
“…expressed here in terms of the output and parasitic current densities i, i E,p and i A,p with use made of Eqs. (13), (18), (23) and (24).…”
Section: Cathode Channelsmentioning
confidence: 99%
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“…In this regard, computational studies and various experimental techniques including chromatography, , differential electrochemical mass spectrometry (DEMS) in situ Fourier transform infrared spectroscopy (FTIR), ,, and nuclear magnetic resonance (NMR) have been successfully employed to give insights regarding the mechanism of the EOR occurring at the developed anode catalysts. Briefly, DEMS has proven to be a useful technique to investigate and quantify the volatile and gaseous species that are generated during the electrochemical reaction.…”
Section: Introductionmentioning
confidence: 99%