Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells

Y. Okada, A. Ishihara, M. Matsumoto, M. Arao, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

  • 7 Citations

Abstract

xNyOz/MWCNT) were prepared by oxidation of oxy-zirconium phthalocyanine under low oxygen partial pressure and examined as new non-platinum cathodes for polymer electrolyte fuel cells. The effect of reheating treatment of ZrCxNyOz/MWCNT in the temperature range from 900 to 1200°C for 1 h under nitrogen atmosphere on the activity and stability of the oxygen-reduction reaction (ORR) was investigated. The reheating treatment at 1000°C enhanced the ORR activity because of the formation of oxygen vacancies, which might act as active sites for the ORR. The reheating treatment at temperatures above 1100°C, however, led to the formation of carbonitrides which are unstable under cathode conditions, resulting in decrease in the ORR activity. The reheating treatment significantly increased the durability of ORR at both low (0.6 V vs. reversible hydrogen electrode (RHE)) and high (1.2 V) potential. The reheating treatment at higher temperatures promoted graphitization of the deposited carbon. Because the degradation in the high-potential region mainly originates from corrosion of the carbon materials, graphitization would be effective to improve the durability.]]>

Original languageEnglish
Pages (from-to)F959-F964
JournalJournal of the Electrochemical Society
Volume162
Issue number9
DOIs
StatePublished - 2015 Jun 11

Fingerprint

Oxygen
Temperature
Graphitization
Electrocatalysts
Zirconium
Zirconia
Fuel cells
Durability
Cathodes
Electrolytes
Carbon
Polymers
Carbon nitride
Oxygen vacancies
Catalyst supports
Partial pressure
Carbon nanotubes
Thermodynamic properties
Protective atmospheres
Corrosion

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells. / Okada, Y.; Ishihara, A.; Matsumoto, M.; Arao, M.; Imai, H.; Kohno, Y.; Matsuzawa, K.; Mitsushima, S.; Ota, K.

In: Journal of the Electrochemical Society, Vol. 162, No. 9, 11.06.2015, p. F959-F964.

Research output: Contribution to journalArticle

Okada, Y.; Ishihara, A.; Matsumoto, M.; Arao, M.; Imai, H.; Kohno, Y.; Matsuzawa, K.; Mitsushima, S.; Ota, K. / Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells.

In: Journal of the Electrochemical Society, Vol. 162, No. 9, 11.06.2015, p. F959-F964.

Research output: Contribution to journalArticle

@article{911a127dfc364a71bf4aa5e5c9ebedfc,
title = "Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells",
author = "Y. Okada and A. Ishihara and M. Matsumoto and M. Arao and H. Imai and Y. Kohno and K. Matsuzawa and S. Mitsushima and K. Ota",
year = "2015",
month = "6",
doi = "10.1149/2.0201509jes",
volume = "162",
pages = "F959--F964",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "9",

}

TY - JOUR

T1 - Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells

AU - Okada,Y.

AU - Ishihara,A.

AU - Matsumoto,M.

AU - Arao,M.

AU - Imai,H.

AU - Kohno,Y.

AU - Matsuzawa,K.

AU - Mitsushima,S.

AU - Ota,K.

PY - 2015/6/11

Y1 - 2015/6/11

N2 - Zirconium oxide-based electrocatalysts with multi-walled carbon nanotubes as electroconductive support (ZrCxNyOz/MWCNT) were prepared by oxidation of oxy-zirconium phthalocyanine under low oxygen partial pressure and examined as new non-platinum cathodes for polymer electrolyte fuel cells. The effect of reheating treatment of ZrCxNyOz/MWCNT in the temperature range from 900 to 1200°C for 1 h under nitrogen atmosphere on the activity and stability of the oxygen-reduction reaction (ORR) was investigated. The reheating treatment at 1000°C enhanced the ORR activity because of the formation of oxygen vacancies, which might act as active sites for the ORR. The reheating treatment at temperatures above 1100°C, however, led to the formation of carbonitrides which are unstable under cathode conditions, resulting in decrease in the ORR activity. The reheating treatment significantly increased the durability of ORR at both low (0.6 V vs. reversible hydrogen electrode (RHE)) and high (1.2 V) potential. The reheating treatment at higher temperatures promoted graphitization of the deposited carbon. Because the degradation in the high-potential region mainly originates from corrosion of the carbon materials, graphitization would be effective to improve the durability.

AB - Zirconium oxide-based electrocatalysts with multi-walled carbon nanotubes as electroconductive support (ZrCxNyOz/MWCNT) were prepared by oxidation of oxy-zirconium phthalocyanine under low oxygen partial pressure and examined as new non-platinum cathodes for polymer electrolyte fuel cells. The effect of reheating treatment of ZrCxNyOz/MWCNT in the temperature range from 900 to 1200°C for 1 h under nitrogen atmosphere on the activity and stability of the oxygen-reduction reaction (ORR) was investigated. The reheating treatment at 1000°C enhanced the ORR activity because of the formation of oxygen vacancies, which might act as active sites for the ORR. The reheating treatment at temperatures above 1100°C, however, led to the formation of carbonitrides which are unstable under cathode conditions, resulting in decrease in the ORR activity. The reheating treatment significantly increased the durability of ORR at both low (0.6 V vs. reversible hydrogen electrode (RHE)) and high (1.2 V) potential. The reheating treatment at higher temperatures promoted graphitization of the deposited carbon. Because the degradation in the high-potential region mainly originates from corrosion of the carbon materials, graphitization would be effective to improve the durability.

UR - http://www.scopus.com/inward/record.url?scp=84937030841&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84937030841&partnerID=8YFLogxK

U2 - 10.1149/2.0201509jes

DO - 10.1149/2.0201509jes

M3 - Article

VL - 162

SP - F959-F964

JO - Journal of the Electrochemical Society

T2 - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 9

ER -