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Platinum-based micro- structure and catalytic properties of lanthanum-doped film electrode

Author: XuTao
Tutor: YangBin
School: Kunming University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: New Energy IBS Electrocatalyst Pt/C Lanthanum
CLC: O643.3
Type: Master's thesis
Year: 2011
Downloads: 6
Quote: 0
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Abstract


With the application and development of such as petrochemical industry, new energy and environment, the traditional Pt/C catalyst have not been content with the request of these application areas’development. The investigation of the catalyst with low-cost, high activation, high reliability and long life has been the hotspot of researches. The copper can be alloyed with the main phase and improve the particle distribution of the main catalytic phase. The lanthanum has the great co-catalysis performance, when mixed with precious metal it has great synergistic effect which play a role in the improvement of such as oxygen storage and evolution ability of catalyst, the liquidity of lattice oxygen, the thermal stability and dispersion. So, the research of platinum-based membrane electrode doped with lanthanum and supported with graphite fiber is expected to prepare out the catalyst with low volume of contained platinum and high catalytic performance, which can cut cost largely and insure high catalytic activity. The preparation of series of platinum-based membrane electrode samples doped with lanthanum in different technological conditions, the comparison of these differences in microstructure and electrochemical character, and the investigation of these hydrogen evolution performance in the hydrogen preparation by electrolyzing hydrogen sulfide are the main emphasis of our research in this paper, and using these research as research reference of these catalysts in future.Series of samples included simple-layer film, double-layer film and three-layer film have been prepared by ion beam sputtering techniques (IBS) from "multi-purpose high vacuum ion beam sputtering and electron beam evaporation coating machine". The analysis of such as microstructure and component content of film in membrane electrode has been done by such as XRD, XPS, SEM and EDS. The analysis of electrochemical performance of film in membrane electrode also has been done by measuring such as CV, LSV, i-t and voltage-current curve. The results are as follows:(1) Samples of supported platinum membrane catalytic electrode materials alloyed with trace copper and doped with lanthanum has been prepared successfully. In these samples, the main phase is platinum alloyed with trace copper, and its crystal structure is face-centered cubic.(2) The effects of La203 in catalytic film are as follows:①The oxygen storage ability of membrane electrode are improved by lanthanum in catalytic film.②To layered membrane sample, Pt(200), Pt(220) and Pt(311) are suppressed to grow whenever coating LaOx-layer before coating PtCu-layer.③Occuring phenomenon of particle agglomeration is difficult in the position where the La(At%):Pt(At%) is bigger.(3) The sample whose type is PtCu/LaOx/PtCu-C (the deposition time is 150s/300s/150s respectively) has fine and well-distributed particle, and at 30℃, its electrochemical activity is better and its stability is also good, but when it’s at 50℃, its electrochemical activity and stability come to be worse.(4) ICP-AES indicates that the volume of contained platinum deposited by the equipment is 0.0105mg/cm2 every 60 seconds, the sputtering Pt target time of the samples with better combination property are all 300 seconds and their volume of contained platinum is below 0.1mg/cm2 respectively. The test result of voltage-current curve in bi-pole electrolytic system indicates that the exchange current density of the sample whose type is LaOx/PtCu-C (the deposition time is 300s/300s respectively) is 205.01mA/cm2, and it’s promotion character of electrochemical activity with a rise of temperature is well, and it’s stability is also well.(5) The result of changed temperature analysis indicates that the electrochemical activity of membrane electrode sample don’t go up with a rise of temperature simply but go down at certain temperature.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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