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| Title: | Electrochemical durability of carbon nanotubes at 80 ℃ |
| Alternate Title: | Electrochemical durability of carbon nanotubes at 80 C |
| Author (s): | Li, Liang Xing, Yangchuan |
| Department/Lab Affiliations: | Chemical & Biological Engineering Intelligent Systems Center Materials Science & Engineering |
| Keywords: | Acidic oxidation Carbon nanotubes Catalyst support Electrochemical durability Fuel cells |
| Issue Date: | 2008-03-15 |
| Publisher: | Elsevier |
| Citation: | Li, Liang., and Xing, Yangchuan. "Electrochemical durability of carbon nanotubes at 80 C.", Journal of Power Sources, Vol. 178, no. 1, 2008. |
| Abstract: | Carbon nanotubes (CNTs) have been studied as an alternative catalyst support in polymer electrolyte membrane (PEM) fuel cells. Recent studies showed that CNTs appear to be more resistant to electrochemical corrosion than carbon black (CB). In a previous study, we have demonstrated the room temperature durability of multiwalled CNTs in both non-catalyzed and catalyzed electrochemical oxidations. This paper is to report results conducted at 80°C—an operational temperature of PEM fuel cells. It was found that multiwalled CNTs are still more resistant than CB at the elevated temperature. However, the electrochemical oxidation rate is more rapid than that at the room temperature. As a result, a decrease in oxidation currents was observed with cyclic voltammetry, attributed to that the initial surface oxides were quickly converted to more stable oxides or carbon dioxide due to the high temperature. For CNTs, extended oxidation could not occur, in contrast to CB, because it requires attacking on the intact graphite planes which are corrosion resistant under the experimental conditions. It was found that the kinetics followed different power laws in time for different carbons. |
| Type: | Article - Journal text |
| In Title: | Journal of Power Sources |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. FULL COPYRIGHT INFORMATION: |
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| title | Electrochemical durability of carbon nanotubes at 80 ℃ |
| title.alternative | Electrochemical durability of carbon nanotubes at 80 C |
| contributor.author | Li, Liang |
| contributor.author | Xing, Yangchuan |
| contributor.deptlab | Chemical & Biological Engineering |
| contributor.deptlab | Intelligent Systems Center |
| contributor.deptlab | Materials Science & Engineering |
| contributor.sponsor | National Science Foundation |
| subject | Acidic oxidation |
| subject | Carbon nanotubes |
| subject | Catalyst support |
| subject | Electrochemical durability |
| subject | Fuel cells |
| date.issued | 2008-03-15 |
| publisher | Elsevier |
| identifier.citation | Li, Liang., and Xing, Yangchuan. "Electrochemical durability of carbon nanotubes at 80 C.", Journal of Power Sources, Vol. 178, no. 1, 2008. |
| identifier.pub.URI | |
| description.abstract | Carbon nanotubes (CNTs) have been studied as an alternative catalyst support in polymer electrolyte membrane (PEM) fuel cells. Recent studies showed that CNTs appear to be more resistant to electrochemical corrosion than carbon black (CB). In a previous study, we have demonstrated the room temperature durability of multiwalled CNTs in both non-catalyzed and catalyzed electrochemical oxidations. This paper is to report results conducted at 80°C—an operational temperature of PEM fuel cells. It was found that multiwalled CNTs are still more resistant than CB at the elevated temperature. However, the electrochemical oxidation rate is more rapid than that at the room temperature. As a result, a decrease in oxidation currents was observed with cyclic voltammetry, attributed to that the initial surface oxides were quickly converted to more stable oxides or carbon dioxide due to the high temperature. For CNTs, extended oxidation could not occur, in contrast to CB, because it requires attacking on the intact graphite planes which are corrosion resistant under the experimental conditions. It was found that the kinetics followed different power laws in time for different carbons. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights.URI | |
| relation.isPartOf | Journal of Power Sources |
| date.accessioned | 2007-04-11T17:00:48Z |
| date.available | 2008-06-02T21:45:37Z |
| identifier.persist.URI |