التفاصيل البيبلوغرافية
| العنوان: |
The Importance of Water Transport in High Conductivity and High-Power Alkaline Fuel Cells. |
| المؤلفون: |
Mandal, Mrinmay, Huang, Garrett, Ul Hassan, Noor, Xiong Peng, Taoli Gu, Brooks-Starks, Ahmon H., Bahar, Bamdad, Mustain, William E., Kohl, Paul A. |
| المصدر: |
Journal of The Electrochemical Society; Apr2020, Vol. 167 Issue 5, p146-156, 11p |
| مصطلحات موضوعية: |
ALKALINE fuel cells, ELECTROCHEMICAL apparatus, OXYGEN electrodes, STANDARD hydrogen electrode, ION exchange (Chemistry), NEGATIVE electrode, POWER density, PROTON exchange membrane fuel cells |
| مستخلص: |
High ionic conductivitymembranes can be used tominimize ohmic losses in electrochemical devices such as fuel cells, flow batteries, and electrolyzers. Very high hydroxide conductivity was achieved through the synthesis of a norbornene-based tetrablock copolymer with an ion-exchange capacity of 3.88 meq/g. The membranes were cast with a thin polymer reinforcement layer and lightly cross- linked with N,N,N',N'-tetramethyl-1,6-hexanediamine. The norbornene polymer had a hydroxide conductivity of 212 mS/cm at 80°C. Light cross-linking helped to control the water uptake and provide mechanical stability while balancing the bound (i.e. waters of hydration) vs. free water in the films. The films showed excellent chemical stability with <1.5% conductivity loss after soaking in 1 M NaOH for 1000 h at 80°C. The aged films were analyzed by FT-IR before and after aging to confirm their chemical stability. AH2/O2 alkaline polymer electrolyte fuel cell was fabricated and was able to achieve a peak power density of 3.5 W/cm² with a maximum current density of 9.7 A/cm² at 0.15 V at 80°C. The exceptionally high current and power densities were achieved by balancing and optimizing water removal and transport from the hydrogen negative electrode to the oxygen positive electrode. High water transport and thinness are critical aspects of the membrane in extending the power and current density of the cells to new record values. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Supplemental Index |
