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Study on the Transition Metal Compound Catalysts for Cathode of PEMFC

Author: QiuPeng
Tutor: LiShang
School: Wuhan University of Technology
Course: New Energy Material
Keywords: Proton exchange membrane fuel cell Non - precious metal catalyst Oxygen reduction reaction Catalytic activity
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 146
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Abstract


The proton exchange membrane fuel cell (Proton exchange membrane fuel cells, PEMFCs) because of the low emissions and high efficiency is considered to be most suitable for mobile and fixed- power requirements of the power generation device . Pt / C catalyst in the development process of the fuel cell , the high cost is one of the bottlenecks that hinder its commercialization . Reduce the Pt loading and the study of non - precious metal catalyst has become the hotspot of proton exchange membrane fuel cell research . This article the the Nano level of Co3O4 and Co3O4 / C catalyst was prepared by liquid control precipitation method ; homogeneous precipitation prepared nanoscale iron oxide precursor , and then temperature programmed ammonia the solution prepared Fe2N catalyst . By means of XRD , TEM structural characterization of the catalyst , and linear sweep voltammetry (LSV) and cyclic voltammetry (CV) method of the oxygen reduction catalytic properties of the catalyst was tested . Materials studio on the the Co3O4 surface of oxygen adsorption process simulation to explore the catalytic mechanism . The results show that : ( 1 ) Preparation of Co3O4 and Co3O4 / C , the average particle size were 15nnm and 10 nm . (2) Co3O4 and Co3O4 / C has a catalytic activity for the oxygen reduction reaction , the electron transfer number of 3.3 oxygen reduction process is a two-electron and four - electron reduction of the mixing process . (3 ) end - adsorption mode, primarily to weaken through the interaction between the cobalt and adsorption of the terminal oxygen atom of oxygen molecules in a π bond, and activation of the terminal oxygen atom unadsorbed , hydrogen ions are easy the other side with unadsorbed terminal oxygen atoms to form a new chemical bond , the two electron reaction occurs . Dual Address adsorption occurs , the two oxygen atoms simultaneous adsorption and activation of enhanced electron delocalization sex . Dual Address adsorption the adsorption of the activation of the two oxygen atoms is greater than the end groups , and easy occurrence of four -electron reaction . (4) iron nitride prepared for the oxygen reduction in catalytic activity is very low , it may be due to the adsorption energy is too high and difficult to desorption caused . Further, there is no carbon carrier is also one of the reasons of lower catalytic performance .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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