Abstract
Carbon nanoparticles modified with a cobalt-adsorbed polypyrrole film (Co/PPy/C) were found to be a good electrocatalyst for O2 reduction. The Co/PPy/C catalyst was synthesized by a multiple modification method for the purpose of obtaining Co-N4 structure in high density. The conventional Co/PPy/C catalyst was prepared by electropolymerization of pyrrole onto the surface of carbon particles dispersed in the electrolyte solution containing pyrrole, followed by complexation using cobalt acetate. The new Co/PPy/C catalyst was prepared by repeating the above operation. Compared with those of the conventional catalyst, the cobalt ions and nitrogen atoms constituting active centers increased remarkably. The carbon nanoparticles prepared by the multiple modification method was suspended in a Nafion solution, and pseudo MEA (Membrane Electrode Assembly) was made by casting the solution onto an edge-plane pyrolytic graphite electrode. It was revealed that the new catalyst reduced O2 mainly with four electrons, the number of electrons transferred n being 3.3 at a positive potential (Ep = 0.31 V vs. SCE). In addition, the catalytic activity of the catalyst was improved by optimizing the heat-treatment conditions (n = 3.8 at Ep = 0.42 V vs. SCE). These results show the potential use of the present catalyst as a novel cathode catalyst in the fuel cell.
| Original language | English |
|---|---|
| Pages (from-to) | 601-606 |
| Number of pages | 6 |
| Journal | Kobunshi Ronbunshu |
| Volume | 63 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2006 Sep |
| Externally published | Yes |
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Keywords
- Electrocatalyst
- Electropolymerization
- Oxygen reduction
- Polypyrrole
ASJC Scopus subject areas
- Polymers and Plastics
- Environmental Science(all)
- Materials Science (miscellaneous)
- Chemical Engineering (miscellaneous)
- Ceramics and Composites
Cite this
Improved activity of cathode catalysts for fuel cells by optimizing the conditions for preparation of carbon particles modified with cobalt-polyrrole complex. / Yuasa, Makoto; Oyaizu, Kenichi; Murata, Hidenori; Tanaka, Ken; Yamamoto, Masakuni.
In: Kobunshi Ronbunshu, Vol. 63, No. 9, 09.2006, p. 601-606.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improved activity of cathode catalysts for fuel cells by optimizing the conditions for preparation of carbon particles modified with cobalt-polyrrole complex
AU - Yuasa, Makoto
AU - Oyaizu, Kenichi
AU - Murata, Hidenori
AU - Tanaka, Ken
AU - Yamamoto, Masakuni
PY - 2006/9
Y1 - 2006/9
N2 - Carbon nanoparticles modified with a cobalt-adsorbed polypyrrole film (Co/PPy/C) were found to be a good electrocatalyst for O2 reduction. The Co/PPy/C catalyst was synthesized by a multiple modification method for the purpose of obtaining Co-N4 structure in high density. The conventional Co/PPy/C catalyst was prepared by electropolymerization of pyrrole onto the surface of carbon particles dispersed in the electrolyte solution containing pyrrole, followed by complexation using cobalt acetate. The new Co/PPy/C catalyst was prepared by repeating the above operation. Compared with those of the conventional catalyst, the cobalt ions and nitrogen atoms constituting active centers increased remarkably. The carbon nanoparticles prepared by the multiple modification method was suspended in a Nafion solution, and pseudo MEA (Membrane Electrode Assembly) was made by casting the solution onto an edge-plane pyrolytic graphite electrode. It was revealed that the new catalyst reduced O2 mainly with four electrons, the number of electrons transferred n being 3.3 at a positive potential (Ep = 0.31 V vs. SCE). In addition, the catalytic activity of the catalyst was improved by optimizing the heat-treatment conditions (n = 3.8 at Ep = 0.42 V vs. SCE). These results show the potential use of the present catalyst as a novel cathode catalyst in the fuel cell.
AB - Carbon nanoparticles modified with a cobalt-adsorbed polypyrrole film (Co/PPy/C) were found to be a good electrocatalyst for O2 reduction. The Co/PPy/C catalyst was synthesized by a multiple modification method for the purpose of obtaining Co-N4 structure in high density. The conventional Co/PPy/C catalyst was prepared by electropolymerization of pyrrole onto the surface of carbon particles dispersed in the electrolyte solution containing pyrrole, followed by complexation using cobalt acetate. The new Co/PPy/C catalyst was prepared by repeating the above operation. Compared with those of the conventional catalyst, the cobalt ions and nitrogen atoms constituting active centers increased remarkably. The carbon nanoparticles prepared by the multiple modification method was suspended in a Nafion solution, and pseudo MEA (Membrane Electrode Assembly) was made by casting the solution onto an edge-plane pyrolytic graphite electrode. It was revealed that the new catalyst reduced O2 mainly with four electrons, the number of electrons transferred n being 3.3 at a positive potential (Ep = 0.31 V vs. SCE). In addition, the catalytic activity of the catalyst was improved by optimizing the heat-treatment conditions (n = 3.8 at Ep = 0.42 V vs. SCE). These results show the potential use of the present catalyst as a novel cathode catalyst in the fuel cell.
KW - Electrocatalyst
KW - Electropolymerization
KW - Oxygen reduction
KW - Polypyrrole
UR - http://www.scopus.com/inward/record.url?scp=33750206989&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33750206989&partnerID=8YFLogxK
U2 - 10.1295/koron.63.601
DO - 10.1295/koron.63.601
M3 - Article
VL - 63
SP - 601
EP - 606
JO - Kobunshi Ronbunshu
JF - Kobunshi Ronbunshu
SN - 0386-2186
IS - 9
ER -