Proceedings of the Polymer Society of Korea Conference (한국고분자학회:학술대회논문집)
- 2006.10a
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- Pages.184-184
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- 2006
The development of membranes for high temperature PEMFC
- Lee, Doo-Yeon (Residential PEMFC Fuel Cell T/F, Energy & Materials Research Lab) ;
- Sun, Hee-Young (Residential PEMFC Fuel Cell T/F, Energy & Materials Research Lab) ;
- Cho, Chung-Kun (Residential PEMFC Fuel Cell T/F, Energy & Materials Research Lab) ;
- Lee, Myung-Jin (Residential PEMFC Fuel Cell T/F, Energy & Materials Research Lab) ;
- Seung, Do-Young (Residential PEMFC Fuel Cell T/F, Energy & Materials Research Lab)
- Published : 2006.10.13
Abstract
We have succeeded in the preparation of high molecular weight polybenzimidazoles by solution polycondensation of 3,3'-diaminobenzidine tetrahydrochloride with isophthalic acid, terephthalic acid, or with their derivatives using polyphosphoric acid both as solvent and as condensing agent. Also, we modified phosphoric acid into fluoroalkyl-phosphonic acids[F-PA]. The main reasons are as follows, first of all F-PAs are stronger acids than PA and alkylphosphonic acids which should promote proton hopping and transport. In addition, F-PA has weaker adsorption onto Pt which help to prevent electrocatalyst poisoning and promote higher oxygen reduction activity. The ionic conductivity of 85%-H3PO4 doped membranes show
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