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Research Papers

Oxygen Reduction Activity on a Nanosized Perovskite-Type Oxide Prepared by Polyvinyl Pyrrolidone Method

[+] Author and Article Information
Tsukasa Nagai

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: tsukasa-nagai@aist.go.jp

Naoko Fujiwara

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: n-fujiwara@aist.go.jp

Mitsunori Kitta

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: m-kitta@aist.go.jp

Masafumi Asahi

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: m.asahi@aist.go.jp

Shin-ichi Yamazaki

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: s-yamazaki@aist.go.jp

Zyun Siroma

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: siroma.z@aist.go.jp

Tsutomu Ioroi

Research Institute for Ubiquitous Energy Devices,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-8-31, Midorigaoka,
Ikeda, Osaka 563-8577, Japan
e-mail: ioroi-t@aist.go.jp

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received October 16, 2014; final manuscript received December 15, 2014; published online January 13, 2015. Assoc. Editor: Dr. Masashi Mori.

J. Fuel Cell Sci. Technol 12(2), 021007 (Apr 01, 2015) (5 pages) Paper No: FC-14-1123; doi: 10.1115/1.4029424 History: Received October 16, 2014; Revised December 15, 2014; Online January 13, 2015

A nanosized perovskite-type oxide supported on carbon black (perovskite/C) was prepared by the polyvinyl pyrrolidone (PVP) addition method and subsequent mechanical milling with carbon black. Transmission electron microscope (TEM) observation and scanning transmission electron microscope (STEM)–energy dispersive X-ray (EDX) mapping clearly revealed that the oxide prepared by the PVP method was small (ca. 20 nm) and highly dispersed on the carbon support. The oxygen reduction reaction (ORR) activity on the perovskite/C catalyst was investigated with rotating ring-disk electrode (RRDE) measurement in an alkaline solution at 25 °C. The prepared perovskite/C catalyst showed enhanced activity compared to catalysts obtained by the conventional solid state reaction and citrate process; i.e., a positive shift of the onset potential and increased ORR current at a disk electrode. The present catalyst was also associated with decreased ring current.

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Figures

Grahic Jump Location
Fig. 2

TEM image of the La0.6Sr0.4Mn0.6Fe0.4O3/C catalysts (PVP method (a), citrate process (b), and solid state reaction (c)). Dark spots indicate the presence of La0.6Sr0.4Mn0.6Fe0.4O3 particles.

Grahic Jump Location
Fig. 1

XRD patterns for carbon-supported La0.6Sr0.4Mn0.6Fe0.4O3 (La0.6Sr0.4Mn0.6Fe0.4O3/C) prepared by different processes (•: perovskite-type structure). Corresponding data for carbon are also shown for comparison.

Grahic Jump Location
Fig. 3

STEM–EDX elemental mapping images of the La0.6Sr0.4Mn0.6Fe0.4O3/C catalysts (PVP method (a), citrate process (b), and solid state reaction (c)). The scale bar in HAADF applies to all images.

Grahic Jump Location
Fig. 4

(a) Hydrodynamic voltammograms in O2-saturated 0.1 M KOH solution obtained at 10 mV s−1, 900 rpm, and 25 °C for La0.6Sr0.4Mn0.6Fe0.4O3/C. (b) Ring electrode current during oxygen reduction. (PVP addition (1), citrate process (2), and solid state reaction (3)), La0.6Sr0.4Mn0.6Fe0.4O3 as prepared by the PVP method (4), carbon (5), and La0.6Sr0.4Mn0.6Fe0.4O3(PVP) + C before ball milling (6). Corresponding data for commercially available Pt/C are also shown as (7).

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