Ethanol tolerant precious metal free cathode catalyst for alkaline direct ethanol fuel cells

Ilena Grimmer, Paul Johann Zorn, Stephan Weinberger, Christoph Grimmer, Birgit Elvira Pichler, Bernd Cermenek, Florian Gebetsroither, Alexander Schenk, Franz-Andreas Mautner, Brigitte Bitschnau, Viktor Hacker

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

La0.7Sr0.3(Fe0.2Co0.8)O3 and La0.7Sr0.3MnO3 based cathode catalysts are synthesized by the sol-gel method. These perovskite cathode catalysts are tested in half cell configuration and compared to MnO2 as reference material in alkaline direct ethanol fuel cells (ADEFCs). The best performing cathode is tested in single cell setup using a standard carbon supported Pt0.4Ru0.2 based anode. A backside Luggin capillary is used in order to register the anode potential during all measurements. Characteristic processes of the electrodes are investigated using electrochemical impedance spectroscopy. Physical characterizations of the perovskite based cathode catalysts are performed with a scanning electron microscope (SEM) and by X-ray diffraction showing phase pure materials. In half cell setup, La0.7Sr0.3MnO3 shows the highest tolerance toward ethanol with a performance of 614 mA cm2 at 0.65 V vs. RHE in 6 M KOH and 1 M EtOH at RT. This catalyst outperforms the state-of-the-art precious metal-free MnO2 catalyst in presence of ethanol. In fuel cell setup, the peak power density is 27.6 mW cm2 at a cell voltage of 0.345 V and a cathode potential of 0.873 V vs. RHE.
Originalspracheenglisch
Seiten (von - bis)325-331
Seitenumfang7
FachzeitschriftElectrochimica acta
Jahrgang228
DOIs
PublikationsstatusVeröffentlicht - 20 Feb 2017

Schlagwörter

  • Electrochemistry
  • Fuel Cells
  • Electrochemical Impedance Spectroscopy

Fields of Expertise

  • Mobility & Production

Dies zitieren

Ethanol tolerant precious metal free cathode catalyst for alkaline direct ethanol fuel cells. / Grimmer, Ilena; Zorn, Paul Johann; Weinberger, Stephan; Grimmer, Christoph; Pichler, Birgit Elvira; Cermenek, Bernd; Gebetsroither, Florian; Schenk, Alexander; Mautner, Franz-Andreas; Bitschnau, Brigitte; Hacker, Viktor.

in: Electrochimica acta, Jahrgang 228, 20.02.2017, S. 325-331.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Grimmer, Ilena ; Zorn, Paul Johann ; Weinberger, Stephan ; Grimmer, Christoph ; Pichler, Birgit Elvira ; Cermenek, Bernd ; Gebetsroither, Florian ; Schenk, Alexander ; Mautner, Franz-Andreas ; Bitschnau, Brigitte ; Hacker, Viktor. / Ethanol tolerant precious metal free cathode catalyst for alkaline direct ethanol fuel cells. in: Electrochimica acta. 2017 ; Jahrgang 228. S. 325-331.
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abstract = "La0.7Sr0.3(Fe0.2Co0.8)O3 and La0.7Sr0.3MnO3 based cathode catalysts are synthesized by the sol-gel method. These perovskite cathode catalysts are tested in half cell configuration and compared to MnO2 as reference material in alkaline direct ethanol fuel cells (ADEFCs). The best performing cathode is tested in single cell setup using a standard carbon supported Pt0.4Ru0.2 based anode. A backside Luggin capillary is used in order to register the anode potential during all measurements. Characteristic processes of the electrodes are investigated using electrochemical impedance spectroscopy. Physical characterizations of the perovskite based cathode catalysts are performed with a scanning electron microscope (SEM) and by X-ray diffraction showing phase pure materials. In half cell setup, La0.7Sr0.3MnO3 shows the highest tolerance toward ethanol with a performance of 614 mA cm2 at 0.65 V vs. RHE in 6 M KOH and 1 M EtOH at RT. This catalyst outperforms the state-of-the-art precious metal-free MnO2 catalyst in presence of ethanol. In fuel cell setup, the peak power density is 27.6 mW cm2 at a cell voltage of 0.345 V and a cathode potential of 0.873 V vs. RHE.",
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AU - Grimmer, Ilena

AU - Zorn, Paul Johann

AU - Weinberger, Stephan

AU - Grimmer, Christoph

AU - Pichler, Birgit Elvira

AU - Cermenek, Bernd

AU - Gebetsroither, Florian

AU - Schenk, Alexander

AU - Mautner, Franz-Andreas

AU - Bitschnau, Brigitte

AU - Hacker, Viktor

PY - 2017/2/20

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N2 - La0.7Sr0.3(Fe0.2Co0.8)O3 and La0.7Sr0.3MnO3 based cathode catalysts are synthesized by the sol-gel method. These perovskite cathode catalysts are tested in half cell configuration and compared to MnO2 as reference material in alkaline direct ethanol fuel cells (ADEFCs). The best performing cathode is tested in single cell setup using a standard carbon supported Pt0.4Ru0.2 based anode. A backside Luggin capillary is used in order to register the anode potential during all measurements. Characteristic processes of the electrodes are investigated using electrochemical impedance spectroscopy. Physical characterizations of the perovskite based cathode catalysts are performed with a scanning electron microscope (SEM) and by X-ray diffraction showing phase pure materials. In half cell setup, La0.7Sr0.3MnO3 shows the highest tolerance toward ethanol with a performance of 614 mA cm2 at 0.65 V vs. RHE in 6 M KOH and 1 M EtOH at RT. This catalyst outperforms the state-of-the-art precious metal-free MnO2 catalyst in presence of ethanol. In fuel cell setup, the peak power density is 27.6 mW cm2 at a cell voltage of 0.345 V and a cathode potential of 0.873 V vs. RHE.

AB - La0.7Sr0.3(Fe0.2Co0.8)O3 and La0.7Sr0.3MnO3 based cathode catalysts are synthesized by the sol-gel method. These perovskite cathode catalysts are tested in half cell configuration and compared to MnO2 as reference material in alkaline direct ethanol fuel cells (ADEFCs). The best performing cathode is tested in single cell setup using a standard carbon supported Pt0.4Ru0.2 based anode. A backside Luggin capillary is used in order to register the anode potential during all measurements. Characteristic processes of the electrodes are investigated using electrochemical impedance spectroscopy. Physical characterizations of the perovskite based cathode catalysts are performed with a scanning electron microscope (SEM) and by X-ray diffraction showing phase pure materials. In half cell setup, La0.7Sr0.3MnO3 shows the highest tolerance toward ethanol with a performance of 614 mA cm2 at 0.65 V vs. RHE in 6 M KOH and 1 M EtOH at RT. This catalyst outperforms the state-of-the-art precious metal-free MnO2 catalyst in presence of ethanol. In fuel cell setup, the peak power density is 27.6 mW cm2 at a cell voltage of 0.345 V and a cathode potential of 0.873 V vs. RHE.

KW - Electrochemistry

KW - Fuel Cells

KW - Electrochemical Impedance Spectroscopy

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