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Research Papers

Ethanol: Tolerant Oxygen Reduction Reaction Catalysts in Alkaline Media

[+] Author and Article Information
Chakkrapong Chaiburi

Fuel Cell Systems Group,
Institute of Chemical Engineering and
Environmental Technology,
Graz University of Technology,
NAWI Graz, Inffeldgasse 25C,
Graz 8010, Austria
e-mails: chakkrapong@tsu.ac.th;
kchakkrapong@yahoo.com

Bernd Cermenek, Birgit Elvira Pichler, Christoph Grimmer, Viktor Hacker

Fuel Cell Systems Group,
Institute of Chemical Engineering and
Environmental Technology,
Graz University of Technology,
NAWI Graz, Inffeldgasse 25C,
Graz 8010, Austria

Manuscript received May 26, 2016; final manuscript received July 2, 2018; published online December 6, 2018. Editor: Wilson K. S. Chiu.

J. Electrochem. En. Conv. Stor. 16(2), 021004 (Dec 06, 2018) (6 pages) Paper No: JEECS-16-1071; doi: 10.1115/1.4041979 History: Received May 26, 2016; Revised July 02, 2018

This paper describes electrocatalysts for the oxygen reduction reaction (ORR) in alkaline direct ethanol fuel cells (ADEFCs), using the non-noble metal electrocatalyst Ag/C, MnO2/C and AgMnO2/C. These electrocatalysts showed tolerance toward ethanol in alkaline media and therefore resistance to ethanol crossover in ADEFCs. Transmission electron microscopy, X-ray spectroscopy (EDX), cyclic voltammetry, and rotating disk electrode (RDE) were employed to determine the morphology, composition, and electrochemical activity of the catalysts. The herein presented results confirm that the AgMnO2/C electrocatalyst significantly outperforms the state-of-the art ORR catalyst platinum.

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References

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Figures

Grahic Jump Location
Fig. 4

Linear potential scan curves of AgMnO2/C on a RDE in O2 saturated 0.1 M KOH and 1.0 M KOH at 30 °C, with a sweep rate of 10 mV s−1 and a rotation rate of 1600 rpm

Grahic Jump Location
Fig. 5

Linear potential scan curves of Pt/C, Ag/C, MnO2/C, and AgMnO2/C on a RDE in O2 saturated 1.0 M KOH with 0.5 M ethanol in the electrolytes at 30 °C, a sweep rate of 10 mV s−1 and a rotation rate of 1600 rpm

Grahic Jump Location
Fig. 6

Linear potential scan curves of Pt/C, Ag/C, MnO2/C, and AgMnO2/C on a RDE in O2 saturated 0.1 M KOH with 0.5 M ethanol in the electrolyte at 30 °C, a sweep rate of 10 mV s−1, and a rotation rate of 1600 rpm

Grahic Jump Location
Fig. 3

Linear potential scan curves of AgMnO2/C and Pt/C electrocatalysts on a RDE (a) 1.0 M and (b) 0.1 M of KOH in O2 saturated electrolyte at 30 °C, with a sweep rate of 10 mV s−1 and rotation rate of 1600 rpm

Grahic Jump Location
Fig. 2

Base cyclic voltammograms of Ag/C, MnO2/C, AgMnO2/C, and Pt/C catalysts in (a) 1.0 M and (b) 0.1 M of KOH electrolyte with N2 saturated at 30 °C and a sweep rate of 10 mV s−1

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Fig. 1

Transmission electron microscopy of Ag/C, MnO2/C, and AgMnO2/C catalysts

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Fig. 7

Oxygen reduction reaction scan curves of (a) Ag/C, (b) MnO2/C, and (c) AgMnO2/C on RDE and Koutecky–Levich plots of (d) Ag/C, (e) MnO2/C, and (f) AgMnO2/C at different potentialsin O2 saturated 1.0 M KOH at 30 °C, with a sweep rate of 10 mV s−1

Grahic Jump Location
Fig. 8

Oxygen reduction reaction scan curves of (a) Ag/C, (b) MnO2/C, and (c) AgMnO2/C on a RDE and Koutecky–Levich plots of (d) Ag/C, (e) MnO2/C, and (f) AgMnO2/C at different potentialsin O2 saturated 0.1 M KOH at 30 °C, with a sweep rate of 10 mV s−1

Grahic Jump Location
Fig. 9

Comparison of the limiting current activity (il) at 0.3 V with a rotation rate of 1600 rpm for (a) 0.1 M KOH and (b) 1.0 M KOH with and without 0.5 M EtOH in KOH electrolyte

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