The laminated composite polymer electrolyte membrane is prepared as a sandwich structure, i.e., Nafion-Nafion/polyvinylene difluoride (PVdF)-Nafion. The conductivity of the laminated membrane is 1.1×10-2Scm -1. The middle layer of PVdF/Nafion successfully blocks methanol cross-over. In tests in a direct methanol fuel cell (DMFC), all of the Nafion-Nafion/PVdF-Nafion membranes give higher power densities than with a Nafion membrane. The highest current density using a blend membrane with 20% PVdF at a constant cell voltage of 0.3V is 217.64mAcm-2 at 110°C. It is noteworthy that the Nafion-Nafion/PVdF-Nafion laminated membrane sustains high performance at temperatures above 130°C, whereas the performance of a Nafion membrane is drastically decreased.
Bibliographical noteFunding Information:
This work was supported by the Ministry of Science and Technology of Korea through the National Research Laboratory Program. It was also sponsored by a Korea Research Foundation Grant (KRF-2001-005-E00030).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering