Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.
-
Upload
nancy-summers -
Category
Documents
-
view
225 -
download
1
Transcript of Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.
![Page 1: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/1.jpg)
Reporter: Yu-Syuan Lu
Advisor: Wei-Tong Liao
Date:05/18/2011
![Page 2: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/2.jpg)
Last semester
![Page 3: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/3.jpg)
OUTLINE
Introduction Materials Experimental Results and discussion Conclusions Future works
![Page 4: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/4.jpg)
Introduction The direct mathanol fuel cells(DMFCs) have recently recei
ved a lot of attention due to their high-energy density and their low emission of pollutants.
The DMFCs use liquid fuel, which simplifies the problems of delivery and storage and because of their very high theoretical mass energy density, and liquid fuel can be used at ambient temperature and pressure, which makes the DMFC easy to use with portable 3C electronic devices.
![Page 5: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/5.jpg)
Materials PVA(Polyvinyl alcohol)
MMT(montmorillonite) Glutaraldehyde(GA)
Hydrochloric acid Acetone Deionized water Sulfuric acid Methanol
H H
O O
OH
n
![Page 6: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/6.jpg)
Experimental
![Page 7: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/7.jpg)
Experimental
The PVA/MMT composite polymer membranes were prepared using a solution casting method.
weight ratios of thePVA:MMT= 1:0.02–0.20
dissolved and dispersed in distilled water by stirring
stirred continuously until the solution mixture reached a homogeneous viscous
appearance at 90 ◦C for 3 h.
![Page 8: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/8.jpg)
The container with the viscous solution was weighed and thenthe excess water was allowed to evaporate slowly at 25 ◦C with
a relative humidity of 30RH%.
Experimental
The thickness was controlled in the range of 0.10–0.30mm.
![Page 9: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/9.jpg)
Experimental
membrane was furthercrosslinked by immersion
solution of 5 wt.% GA, 1.0 vol.% HCl (as a catalyst) and acetone for the crosslinking reaction at 40 ◦C for 12 h.
![Page 10: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/10.jpg)
Results and discussion
![Page 11: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/11.jpg)
Results and discussion(TGA analyses)
the weight loss of water
degradation ofthe side-chain of the
PVA/MMT
cleavage C-C backbone of PVA/MMT
![Page 12: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/12.jpg)
DSC analyses
It indicated a changebetween a semi-crystalline phase
and an amorphous phase.
![Page 13: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/13.jpg)
DMA analysesThe storage modulus (E') vs. temperature curve
It confirmed that the MMT fillers enhanced the mechanical properties.
When the MMT filler was 20 wt.%, the stiffening effectwas progressively reduced due to the agglomeration of the MMT
fillers in the PVA matrix
![Page 14: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/14.jpg)
SEM analyses
SEM photographs for the PVA/10wt.%MMT composite polymer membrane:(a) at 2 kx and (b) at 9 kx.
the MMT fillers (shown as a white color) was uniformly embedded into the PVA matrix.
![Page 15: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/15.jpg)
Raman spectraH2C
CH
OH
indicated an increase of amorphous domains in the PVA/MMT composite membrane.
![Page 16: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/16.jpg)
Ionic conductivity measurements
the ionic conductivity starts to decrease when the amount of added MMT
fillers was over 10 wt.%.
![Page 17: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/17.jpg)
Methanol permeability
PNafion117= 5.16×10-6
SNafion117= 5.7×102
![Page 18: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/18.jpg)
The CV curveThe electrochemical stabilityof the PVA/MMT compositemembrane was better than that of the pure PVA membrane
![Page 19: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/19.jpg)
Conclusions
![Page 20: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/20.jpg)
Conclusions The PVA/MMT composite polymer membranes can be pre
pared through a simple blending process. The permeability values of all PVA/MMT composite mem
branes were lower than those of the Nafion 117 membrane. The ionic conductivity values of the PVA/MMT composite
polymer membranes were higher than those of the Nafion 117 membrane at room temperature.
It was revealed that the addition of MMT fillers into the PVA matrix could markedly improve the electrochemical properties of the PVA/MMT composite membranes.
![Page 21: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/21.jpg)
Conclusions More importantly, the PVA/MMT composite polymer me
mbrane is a cheap non-perfluorosulfonated polymer membrane, as compared to the Nafion polymer membrane.
![Page 22: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/22.jpg)
Future works Prepared the composite polymer membranes based on SPE
S/PEG with various loading weights of organically treated montmorillonite (OMMT).
![Page 23: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/23.jpg)
Furture works
membrane character test
Thermal property analysis
Water uptake analysis
Ion exchange capacity
Proton conductivity
Methanol permeability
![Page 24: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/24.jpg)
According to character data to adjust each parameter, such as various O-MMT loadings, the proportion of PEG to 6F-BPA.
Furture works
![Page 25: Reporter: Yu-Syuan Lu Advisor: Wei-Tong Liao Date:05/18/2011.](https://reader030.fdocuments.us/reader030/viewer/2022020717/56649ece5503460f94bdae2f/html5/thumbnails/25.jpg)
Ending