A proton-conducting membrane demonstrating excellent proton conductivity at high-temperature/low-humidity conditions as well as at fully hydrated states is an urgent demand for proton exchange membrane fuel cells (PEMFC). In this study, in a bid to achieve this goal, we develop a new hybrid membrane, which is based on incorporating SiO2-P2O5 glass electrolytes into hydrophilic channels of Nafion115 by in situ sol-gel synthesis of tetraethoxysilane (TEOS) and trimethylphosphate (TMP). The effect of SiO2-P2O5 content on the morphology, state of water, and water uptake of the hybrid membranes is quantitatively identified. Not only the well-connected/enlarged hydrophilic channels but also the increase in the number of free/bound water molecules is observed in the hybrid membranes. These interesting features are expected to enable the hybrid membranes to present the higher proton conductivity than the pristine Nafion115, which becomes more noticeable at high-temperature/low-humidity conditions.
Bibliographical noteFunding Information:
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy. This work was also supported by the National Research Foundation of Korea , Grant funded by the Korean Government (MEST) ( NRF-2009-C1AAA001-2009-0093307 ). This research was also supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) , funded by the Ministry of Education, Science and Technology ( 2009-0082083 ).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation