Titanium-niobium oxides mixed with Ti4O7 as precious-metal-and carbon-free cathodes for polymer electrolyte fuel cells

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

  • 4 Citations

Abstract

The development of non-platinum electrocatalysts for oxygen reduction reactions (ORR) is required for the commercialization of polymer electrolyte fuel cells. We focused on highly stable group 4 and 5 metal oxide-based compounds in acidic media. In this study, we proposed precious-metal-and carbon-free cathodes based on oxides and demonstrated the superior durability of oxide-based cathodes by preparing titanium-niobium oxides mixed with Ti4O7 (TixNbyOz + Ti4O7). The ORR activity of the TixNbyOz + Ti4O7 is higher than that of the Ti4O7, indicating that the TixNbyOz might have active sites for the ORR. The highest onset potential of the TixNbyOz + Ti4O7 was ca. 1.1 V with respect to reversible hydrogen electrode. No degradation of the ORR performance of TixNbyOz + Ti4O7 was observed during both start-stop and load cycle tests. Therefore, we successfully demonstrated that the precious-metal-and carbon-free oxide-based cathodes had superior durability under the cathode conditions of a polymer electrolyte fuel cell.

Original languageEnglish
Pages (from-to)F603-F609
JournalJournal of the Electrochemical Society
Volume163
Issue number7
DOIs
StatePublished - 2016

Fingerprint

Cathodes
Oxides
Oxygen
Precious metals
Fuel cells
Electrolytes
Carbon
Polymers
Niobium oxide
Durability
Titanium
Electrocatalysts
Degradation
Hydrogen
Electrodes
Metals

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

Titanium-niobium oxides mixed with Ti4O7 as precious-metal-and carbon-free cathodes for polymer electrolyte fuel cells. / Ishihara, A.; Hamazaki, M.; Arao, M.; Matsumoto, M.; Imai, H.; Kohno, Y.; Matsuzawa, K.; Mitsushima, S.; Ota, K.

In: Journal of the Electrochemical Society, Vol. 163, No. 7, 2016, p. F603-F609.

Research output: Contribution to journalArticle

Ishihara, A.; Hamazaki, M.; Arao, M.; Matsumoto, M.; Imai, H.; Kohno, Y.; Matsuzawa, K.; Mitsushima, S.; Ota, K. / Titanium-niobium oxides mixed with Ti4O7 as precious-metal-and carbon-free cathodes for polymer electrolyte fuel cells.

In: Journal of the Electrochemical Society, Vol. 163, No. 7, 2016, p. F603-F609.

Research output: Contribution to journalArticle

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AU - Hamazaki,M.

AU - Arao,M.

AU - Matsumoto,M.

AU - Imai,H.

AU - Kohno,Y.

AU - Matsuzawa,K.

AU - Mitsushima,S.

AU - Ota,K.

PY - 2016

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N2 - The development of non-platinum electrocatalysts for oxygen reduction reactions (ORR) is required for the commercialization of polymer electrolyte fuel cells. We focused on highly stable group 4 and 5 metal oxide-based compounds in acidic media. In this study, we proposed precious-metal-and carbon-free cathodes based on oxides and demonstrated the superior durability of oxide-based cathodes by preparing titanium-niobium oxides mixed with Ti4O7 (TixNbyOz + Ti4O7). The ORR activity of the TixNbyOz + Ti4O7 is higher than that of the Ti4O7, indicating that the TixNbyOz might have active sites for the ORR. The highest onset potential of the TixNbyOz + Ti4O7 was ca. 1.1 V with respect to reversible hydrogen electrode. No degradation of the ORR performance of TixNbyOz + Ti4O7 was observed during both start-stop and load cycle tests. Therefore, we successfully demonstrated that the precious-metal-and carbon-free oxide-based cathodes had superior durability under the cathode conditions of a polymer electrolyte fuel cell.

AB - The development of non-platinum electrocatalysts for oxygen reduction reactions (ORR) is required for the commercialization of polymer electrolyte fuel cells. We focused on highly stable group 4 and 5 metal oxide-based compounds in acidic media. In this study, we proposed precious-metal-and carbon-free cathodes based on oxides and demonstrated the superior durability of oxide-based cathodes by preparing titanium-niobium oxides mixed with Ti4O7 (TixNbyOz + Ti4O7). The ORR activity of the TixNbyOz + Ti4O7 is higher than that of the Ti4O7, indicating that the TixNbyOz might have active sites for the ORR. The highest onset potential of the TixNbyOz + Ti4O7 was ca. 1.1 V with respect to reversible hydrogen electrode. No degradation of the ORR performance of TixNbyOz + Ti4O7 was observed during both start-stop and load cycle tests. Therefore, we successfully demonstrated that the precious-metal-and carbon-free oxide-based cathodes had superior durability under the cathode conditions of a polymer electrolyte fuel cell.

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