5944

5559

كارشناسي ارشد

مهندسي شيمي پيشرفته

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1389

[نه]،68ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

ارجمند مهرباني، محمود مرآتيان

مرتضي صادقي، حسين اسلامي

1/3/90

محمدرضا احساني، طيبه بهزاد

مهندسي شيمي

ID5559

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

70 Production of Bipolar Plate for PEM Fuel Cell Based on Conductive Composite Polymer Ehsan Zarmehri e zarmehri@ce iut ac ir Date of Submission 2011 03 14 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Dr A Mehrabani arjomand@cc iut ac ir Dr M Meratian m meratian@cc iut ac ir Abstract Bipolar plates play the most significant role in weight volume and corresponding costs of fuel cells Used material for construction of bipolar plates of fuel cell must be formable to a structure and have proper properties for machinery operation to make grooves in various forms over the manufactured plates These grooves are designed to transfer oxygen and hydrogen to the cell s membranes and uniform distribution of gases over them In polymeric fuel cells water is the reaction s product that must be removed from the cells through the grooves Initially metallic and graphite materials had been used for production of bipolar plates due to their electrical conductivity characteristics Later these plates due to their deficiency such as corrosion weight and production expenses were appropriately substituted by composite plates This article presents results of a study on construction of bipolar plates using conductive polymeric composites Polymeric composites are light materials that can be casted in different structures shapes and sizes for application in fuel cells The main advantages of polymeric composites are their high resistance against corrosion and their light weight In the constructed composites polypropylene was implement as polymer matrix and conductive carbon black and graphite as filler in order to supply the required electrical conductivity The added fillers have been distributed in polypropylene by using an internal mixer Then bipolar plate specimens were prepared by molding of composite in hot press The prepared specimens have been characterized to evaluate their specifications such as mechanical properties and their performance properties like thermal and electrical conductivities The results of performed tests have shown a good performance on thermal conductivity greater than 10W m K electrical conductivity higher than 50S cm and high mechanical strength flexural strength greater than 25MPa Composites having 55 60 graphite 15 18 carbon black and 20 25 polypropylene are the best options for producing bipolar plate of fuel cell Although graphite percentage is more than 50 they are not brittle and have proper properties for machinery operation These plates have a density of 1 1 g cm3 The constructed composite plates were optimized and their weights were reduced in comparison to similar metallic plates for about 80 and in contrast to graphite plates for about 40 This method for production of bipolar plates is more economical as it reduces the cost of used materials and expenses of manufacturing operations 3 kinds of conductive carbon black have been used in this project that the composites made of carbon black XE CB and HI CB respectively have had the maximum and minimum electrical and thermal conductivity and mechanical strength Key words Fuel cell bipolar plates composite polypropylene carbon black graphite

ارجمند مهرباني، محمود مرآتيان

مرتضي صادقي، حسين اسلامي

محمدرضا احساني، طيبه بهزاد