Proton conducting polymer electrolyte membrane useful in polymer electrolyte fuel cells
An electrolyte membrane, proton conduction technology, applied in solid electrolyte fuel cells, fuel cells, solid electrolytes, etc., can solve the problems of complex casting methods and expensive base materials
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0077] Proton conductivity data as a function of temperature for pure PVA and PVA-PSSA hybrid membranes are shown in Fig. 1(a). The proton conductivity of pure PVA membrane increases with temperature and reaches 9.4 × 10 at 80 °C -4 Maximum value in S / cm; a drop in conductivity is observed at temperatures above 80°C. The proton conductivity of PVA-PSSA hybrid membranes increased with PSSA content. It will be appreciated that the proton conductivity for PVA-35 wt% PSSA is maximum at 100°C, beyond which the conductivity drops. The proton conductivity of PVA and PVA-PSSA hybrid membranes was also evaluated as a function of RH, as shown in Fig. 1(b). The proton conductivity of a pure PVA membrane at 30 °C and under fully wetted conditions is 1.3 × 10 -3 S / cm. However, the conductivity gradually decreases with decreasing RH. At 0% RH, the conductivity of pure PVA film was found to be ~10 -5 S / cm. At all RH values, the proton conductivity of PVA-PSSA hybrid membranes increase...
Embodiment 2
[0081] After confirming the good proton conductivity of the PVA-PSSA hybrid membranes of the present invention, the membranes were used to prepare membrane electrode assemblies (MEAs), and the performance of these MEAs in conventional PEM-based fuel cells was analyzed and compared with MEA comparison of pure PVA, the negative electrode of the PEM-based fuel cell is supplied with hydrogen. Details of MEA preparation are described below.
[0082] The following 5 kinds of membranes and single cells were prepared respectively, and the thickness of all the membranes was adjusted to about 150 micrometers. Toray carbon paper with a thickness of 0.28 mm was used for the backing layer. Apply 1.5 mg / cm to the backing layer by brushing 2 Vulcan XC72R carbon slurry. An in-house prepared Vulcan XC72R carbon-supported 40 wt% Pt catalyst was coated thereon by the same method. Will be in two electrodes (effective area = 25cm 2 ) on the catalyst content kept at 0.5mg / cm 2 . MEA passed t...
Embodiment 3
[0091] As an embodiment of the present invention, PVA and PVA-PSSA hybrid membranes reduce the previously described methanol permeation. Therefore, it is desirable to control the performance of these membranes after making MEAs in PEM-based fuel cells and to compare the performance with similar cells employing commercially available Nafion-117 membranes, the membranes of the most commonly used DMFC, the PEM-based The negative electrode of the fuel cell is supplied with methanol aqueous solution. Details of MEA preparation for DMFC are described below.
[0092] MEA preparation and its assembly in a single cell test fixture for DMFC was similar to Example 2. However, the catalyst content was kept at 2 mg / cm for the anode (60 wt% Pt / Ru 1:1) and cathode (40 Pt / C prepared in house) 2 . The effective area of DMFC is 4cm 2 . The following three MEAs comprising the membrane of the present invention were respectively prepared and assembled in DMFC single cells.
[0093] 1. Batt...
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| ionic conductivity | aaaaa | aaaaa |
| ionic conductivity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More