Evidence of Nonelectrochemical Shift Reaction on a CO-Tolerant High-Entropy State Pt–Ru Anode Catalyst for Reliable and Efficient Residential Fuel Cell Systems
-
- Tatsuya Takeguchi
- Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
-
- Toshiro Yamanaka
- Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
-
- Kiyotaka Asakura
- Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
-
- Ernee Noryana Muhamad
- Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
-
- Kohei Uosaki
- International Center for Materials Nanoarchitectonics (MANA) and Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
-
- Wataru Ueda
- Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
書誌事項
- 公開日
- 2012-08-21
- DOI
-
- 10.1021/ja304939q
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
A randomly mixed monodispersed nanosized Pt-Ru catalyst, an ultimate catalyst for CO oxidation reaction, was prepared by the rapid quenching method. The mechanism of CO oxidation reaction on the Pt-Ru anode catalyst was elucidated by investigating the relation between the rate of CO oxidation reaction and the current density. The rate of CO oxidation reaction increased with an increase in unoccupied sites kinetically formed by hydrogen oxidation reaction, and the rate was independent of anode potential. Results of extended X-ray absorption fine structure spectroscopy showed the combination of N(Pt-Ru)/(N(Pt-Ru) + N(Pt-Pt)) ≑ M(Ru)/(M(Pt) + M(Ru)) and N(Ru-Pt)/(N(Ru-Pt) + N(Ru-Ru)) ≑ M(Pt)/(M(Ru) + M(Pt)), where N(Pt-Ru)(N(Ru-Pt)), N(Pt-Pt)(N(Ru-Ru)), M(Pt), and M(Ru) are the coordination numbers from Pt(Ru) to Ru(Pt) and Pt (Ru) to Pt (Ru) and the molar ratios of Pt and Ru, respectively. This indicates that Pt and Ru were mixed with a completely random distribution. A high-entropy state of dispersion of Pt and Ru could be maintained by rapid quenching from a high temperature. It is concluded that a nonelectrochemical shift reaction on a randomly mixed Pt-Ru catalyst is important to enhance the efficiency of residential fuel cell systems under operation conditions.
収録刊行物
-
- Journal of the American Chemical Society
-
Journal of the American Chemical Society 134 (35), 14508-14512, 2012-08-21
American Chemical Society (ACS)
