应用湿化学法制备RuO2/C纳米复合物,并以其为载体借助微波法制备成Pt/RuO2/C催化剂.使用透射电镜和X射线衍射分析RuO2/C载体、Pt/RuO2/C催化剂的形貌及晶体结构;循环伏安、稳态阳极腐蚀和旋转圆盘电极等测试电化学性能.结果表明,Pt/RuO2/C催化剂具有良好的耐甲醇渗透性和稳定性,可有效延长催化剂的使用寿命.本文为探索新型高性能DMFC阴极催化剂之制备提供了一条较好的途径.
杜春雨
,
董涛
,
尹鸽平
,
史鹏飞
. 直接甲醇燃料电池高稳定性Pt/RuO_2/C阴极催化剂研究[J]. 电化学, 2009
, 15(4)
: 412
-417
.
DOI: 10.61558/2993-074X.2017
Instability of the carbon-supported Pt(Pt/C) catalyst at the cathode is one of the key technical challenges for the development of Direct Methanol Fuel Cells(DMFCs).In this paper,an efficient approach to enhancing the stability of the cathode catalyst was explored by designing and synthesizing a novel nanocomposite support,RuO2 coated carbon black(RuO2/C).Firstly,a wet chemical method was employed to synthesize the RuO2/C nanocomposite,from which Pt/RuO2/C catalyst was further prepared by a microwave method.The morphology and crystalline structure of the RuO2/C support and Pt/RuO2/C catalyst were then characterized by TEM and XRD.Finally,the electrochemical performance of the RuO2/C support and Pt/RuO2/C catalyst was analyzed by cyclic voltammetry,steady-state anodic corrosion,and rotating disk electrode techniques.The results showed that the Pt/RuO2/C catalyst had significantly improved methanol permeability and stability compared to the Pt/C one,which would extend the service life of DMFC cathode.This Pt/RuO2/C catalyst opens up a preferable method of preparing high performance Pt catalysts for the DMFC cathode.
[1]Ren X M,Zelenay P,Thomas S,et al.Recent ad-vances in direct methanol fuel cells at Los Alamos Na-tional Laboratory[J].Journal of Power Sources,2000,86(1/2):111-116.
[2]Cremers C,Scholz M,Seliger W,et al.Developmentsfor improved direct methanol fuel cell stacks for portablepower[J].Fuel Cells,2007,7(1):21-31.
[3]Dillon R,Srinivasan S,AricA S,et al.Internationalactivities in DMFC R&D:Status of technologies and po-tential applications[J].Journal of Power Sources,2004,127:112-126.
[4]Li Xu-guang,Xing Wei,Lu Tian-hong,et al.Studieson methanol-tolerant cathode electrocatalysts cobalt tet-racarboxylic phthalocyanine supported on carbon black(CoPcTc/C)in direct methanol fuel cell[J].ChemicalJournal of Chinese Universities,2003,24(7):1246-1250.
[5]Baranton S,Coutanceau C,Roux C,et al.Oxygen re-duction reaction in acid medium at iron phthalocyaninedispersed on high surface area carbon substrate:toler-ance to methanol,stability and kinetics[J].Journal ofElectroanalytical Chemistry,2005,577:223-234.
[6]Chen Wei-min,Sun Gong-quan,Zhao Xin-sheng,etal.Degradation of electrocatalysts performance in directmethanol fuel cells[J].Chemical Journal of Chinese U-niversities,2007,28(5):142-145.
[7]Sarma L,Chen C,Wang G,et al.Investigations of di-rect methanol fuel cell(DMFC)fading mechanisms[J].Journal of Power Sources,2007,167:358-365.
[8]Profeti L,Sim es F,Olivi P,et al.Application of Pt+RuO2catalysts prepared by thermal decomposition ofpolymeric precursors to DMFC[J].Journal of PowerSources,2006,158:1195-1201.
[9]Cao L,Scheiba F,Roth C,et al.Novel nanocompositePt/RuO2.xH2O/carbon nanotube catalysts for directmethanol fuel cells[J].Angewandte Chemie,2006,(45):5315-5319.
[10]Chhina H,Campbell S,Kesler O.An oxidation-resist-ant indium tin oxide catalyst support for proton ex-change membrane fuel cells[J].J Power Sources,2006,161:893-900.
[11]Rolison D,Hagans P,Swider K,et al.Role of hy-drous ruthenium oxide in Pt-Ru direct methanol fuelcell anode electrocatalysts:The importance of mixed e-lectron/proton conductivity[J].Langmuir,1999,15(3):774-779.
[12]Ksoylu A E,Freitas M M A,Figueiredo J L.Bime-tallic Pt-Sn catalysts supported on activated carbon:I.The effects of support modification and impregnationstrategy[J].Appl Catal A,2000,192(1):29-42.
[13]Scheiba F,Scholz M,Cao L,et al.On the suitabilityof hydrous ruthenium oxide supports to enhance intrin-sic proton conductivity in DMFC anodes[J].FuelCells,2006,6:439-446.
[14]Radmilovic V,Gasteiger H,Ross P.Structure andchemical composition of a supported Pt-Ru electrocata-lyst for methanol oxidation[J].J Catal,1995,154(1):98-106.
[15]Lou HX,Shi Z J,Li N Q,et al.Investigation of theelectrochemical and electrocatalytic behavior of single-wall carbon nanotube film on a glassy carbon electrode[J].Anal Chem,2001,73:915-920.
[16]Kotz R,Carlen M.Principles and applications of elec-trochemical capacitors[J].Electrochim Acta,2000,45:2483-2498.
