| Fuel cells as a concern in the current level of technology level,which device transform the chemical energy to electrical energy generating,because the running of fuel cell unrestricted Carnot cycle,fuel cell has a high energy conversion theory efficiency(up to 80%of theory),then concerned in many countries and regions around the world.Fuel cell has been considered to a clean,efficient and sustainable development of power generation technology,fuel cell will become the most potential and striking new clean energy in the 21st century.The bipolar plate is a key component of fuel cell,whose main function is to separate oxidizing and reducing agents and collect current.Bipolar plates also has a great impact on operation and efficiency of the fuel cell.Currently,research on bipolar plate focused on material selection and design of flow field aspects.As we know,there are two requirements for the bipolar plate which influence the full cell’s performance:corrosion resistance and electrical conductivity.The corrosion resistance of the bipolar plate determine the fuel cell’s life,at the same time,which determines the conductivity of the bipolar plate determine the efficiency of the fuel cell.In this paper,firstly,we using different methods,which including:scanning electron microscopy(SEM),electrochemical impedance test,dynamic potential scanning and X-ray energy spectrum analysis,made studies on the corrosion resistance and electrical conductivity of the Polyaniline/316L stainless steel bipolar plates and Graphene/Polyaniline modified 316L stainless steel bipolar plate in simulated proton exchange membrane fuel cell anode environment,the experimental results showed that:In a simulated PEMFC anode environment,corrosion current density of graphene modified polyaniline/316L stainless steel fell by an order of magnitude,compared to polyaniline/316L stainless steel,the corrosion resistance of graphene/polyaniline modified 316L stainless steel sheet increased by approximately 28%;compared with the blank 316L stainless steel,it increased by about 52%.Secondly,further study had been made about the corrosion resistance and electrical conductivity of polypyrrole/304 stainless steel bipolar plate and graphene/polypyrrole modified 304 stainless steel bipolar plate in a simulated PEMFC anode environment.The results show that:in a simulated PEMFC anode environment,corrosion current density of graphene modified polypyrrole/304 stainless steel fell by an order of magnitude,compared to polypyrrole/304 stainless steel,the corrosion resistance of graphene/polypyrrole modified 304 stainless steel sheet increased by approximately 64%;compared with the blank 304 stainless steel,it increased by about 84%.All studies show that:the presence of graphene not only improve the electrical conductivity of the polymer modified 304 stainless steel bipolar plate,at the same time,improving its conductive properties,reducing the resistance of the bipolar plate itself to make the bipolar plate more tend to meet the requirement of the proton exchange membrane fuel cell. |
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