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Title: Improved Methanol Barrier Property of Nafion Hybrid Membrane by Incorporating Nanofibrous Interlayer Self-Immobilized with High Level of Phosphotungstic Acid
Journal: ACS applied materials & interfaces
Author: 1. Ebrahim Abouzari-lotf, Mohamed Mahmoud Nasef, Masoumeh Zakeri, 2. Hossein Ghassemi, 3. Arshad Ahmad, 4. Yadollah Abdollahi
Year: 2015
Address: 1. Advanced Materials Research Group, Institute of Hydrogen Energy, Universiti Teknologi Malaysia, International Campus, 54100 Kuala Lumpur, Malaysia 2. Malaysia−Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia 3. Department of Macromolecular Science & Engineering, Case Western Reserve University, 44106-7202 Cleveland, Ohio United States 4. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Abstract: High level of phosphotungstic acid (PWA) was self-immobilized on electrospun nylon nanofiberous sheet to fabricate highly selective methanol barrier layer for sandwich structured proton conducting membranes. Simple tuning for the assembly conditions of central layer and thickness of outer Nafion layers allowed obtaining different composite membranes with superior methanol barrier properties (namely, P = 3.59 × 10−8 cm2 s−1) coupled with proton conductivities reaching 58.6 mS cm−1 at 30 °C. Comparable activation energy for proton transport and more than 20 times higher selectivity than Nafion 115 confirm the effectiveness of the central layer and resulting membranes for application in direct methanol fuel cells (DMFCs). When tested in DMFC single cell, the performance of hybrid membrane was far better than Nafion 115 especially at higher methanol concentrations.
Keywords: self-immobilized materials, electrospun nanofibers, phosphotungstic acid, composite membranes, proton transfer
Application: Membrane
Product Model 1: Electroris
Product Model 2:
URL: http://pubs.acs.org/doi/abs/10.1021/acsami.5b02268#="http://pubs.acs.org" & "/doi/abs/10.1021/acsami.5b02268"#