High performance membrane-electrode assembly based on a surface-modified membrane
| Autor: | Hyung Wook Kim, Youngtai Yoo, Sung Yong Cho, Sang-Il Han, Geun Seok Chai, Jun-Young Kim, Kie Hyun Nam, In-Hyuk Son, An Sung Guk, Jang Moon Yup, Alexey Alexandrovych Serov, Jang Woo Lee, Chan Kwak |
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| Rok vydání: | 2007 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Scanning electron microscope Membrane electrode assembly Analytical chemistry Energy Engineering and Power Technology Anode chemistry.chemical_compound Direct methanol fuel cell Differential scanning calorimetry Membrane chemistry Chemical engineering Sputtering Nafion Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 167:74-78 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2006.12.095 |
| Popis: | A surface-modified membrane is prepared using a sputtering technique that deposits gold directly on a Nafion ® 115 membrane surface that is roughened with silicon carbide paper. The surface-modified membranes are characterized by means of a scanning electron microscope (SEM), differential scanning calorimetry (DSC), and water contact-angle analysis. A single direct methanol fuel cell (DMFC) with a surface-modified membrane exhibits enhanced performance (160 mW cm −2 ), while a bare Nafion ® 115 cell yields 113 mW cm −2 at 0.4 V and an operating temperature of 70 °C. From FE-SEM images and CO ad stripping voltammograms, it is also found that the gold layer is composed of clusters of porous nodule-like particles, which indicates that an anode with nodule-like gold leads to the preferential oxidation of carbon monoxide. These results suggest that the topology of gold in the interfacial area and its electrocatalytic nature may be the critical factors that affect DMFC performance. |
| Databáze: | OpenAIRE |
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