Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells
AbstractIn order to develop noble-metal- and carbon-free cathodes, titanium-niobium oxides were prepared as active materials for oxide-based cathodes and the factors affecting the oxygen reduction reaction (ORR) activity were evaluated. The high concentration sol-gel method was employed to prepare the precursor. Heat treatment in Ar containing 4% H2 at 700–900 °C was effective for conferring ORR activity to the oxide. Notably, the onset potential for the ORR of the catalyst prepared at 700 °C was approximately 1.0 V vs. RHE, resulting in high quality active sites for the ORR. X-ray (diffraction and photoelectron spectroscopic) analyses and ionization potential measurements suggested that localized electronic energy levels were produced via heat treatment under reductive atmosphere. Adsorption of oxygen molecules on the oxide may be governed by the localized electronic energy levels produced by the valence changes induced by substitutional metal ions and/or oxygen vacancies. View Full-Text
- Supplementary File 1:
Supplementary (PDF, 1973 KB)
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Ishihara, A.; Tamura, Y.; Chisaka, M.; Ohgi, Y.; Kohno, Y.; Matsuzawa, K.; Mitsushima, S.; Ota, K.-I. Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells. Catalysts 2015, 5, 1289-1303.
Ishihara A, Tamura Y, Chisaka M, Ohgi Y, Kohno Y, Matsuzawa K, Mitsushima S, Ota K-I. Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells. Catalysts. 2015; 5(3):1289-1303.Chicago/Turabian Style
Ishihara, Akimitsu; Tamura, Yuko; Chisaka, Mitsuharu; Ohgi, Yoshiro; Kohno, Yuji; Matsuzawa, Koichi; Mitsushima, Shigenori; Ota, Ken-ichiro. 2015. "Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells." Catalysts 5, no. 3: 1289-1303.