采用溶胶法制备了用于阴离子膜直接甲醇燃料电池的Pt-Ni/C阴极电催化剂,用XRD、XPS和TEM对催化剂进行了表征,电位线性扫描伏安法测试电化学活性及抗甲醇性.结果表明,制备的Pt-Ni合金颗粒分布均匀,粒径为3～5 nm;掺杂Ni元素可显著增加Pt的催化活性和抗甲醇性,在相同碱性电解液中,不同原子比例Pt-Ni/C的催化剂以Pt50Ni50/C的活性最高,抗甲醇性相对Pt/C有显著提高,在0.1 mol/L KOH溶液中其最大电流密度达到106 mA/mg,氧电还原起始过电位比Pt/C的小50 mV.
Carbon-supported Pt-Ni catalyst samples were prepared by the colloidal method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and transmission electron microscopy (TEM). Potentiodynamic was used to measure the performance of the electro-catalysts for the oxygen electro-reduction. The results indicate that the Pt-Ni alloy particles are distributed homogeneously on the carbon surface, and their particle sizes are 3-5 nm. In the same alkali concentration solution, the activity and methanol-tolerance of Pt nano-particle catalysts are greatly enhanced by doping Ni. For the catalyst, the optimum atom ratio of Pt to Ni is Pt50Ni50/C, and its methanol-tolerance is enhanced markedly as compared with Pt/C. The maximal current of the oxygen electro-reduction over Pt50Ni50/C reaches 106 Ma/mg, and the onset over potential is 50 Mv less than that over Pt/C in 0.1 mol/L KOH solution.
参考文献
| [1] | Lamy C;Lima A;Lerhun V et al.[J].Journal of Power Sources,2002,105(02):283. |
| [2] | Yu E H;Scott K .[J].Journal of Power Sources,2004,137(02):248. |
| [3] | Yu E H;Scott K .[J].Journal of Applied Electrochemistry,2005,35(01):91. |
| [4] | Manoharan R;Prabhurarn J .[J].Journal of Power Sources,2001,96(01):220. |
| [5] | Yu E H;Scott K;Reeve R W .[J].Journal of Electroanalytical Chemistry,2003,547(01):17. |
| [6] | 刘世斌,刘勇,孙彦平,郝晓刚,张忠林.Ru,Sn和Co促进的Pt/C催化剂电催化氧化甲醇的性能[J].催化学报,2006(09):787-792. |
| [7] | Tripkovic A V;Popovic K D;Momcilovic J D et al.[J].Journal of Electroanalytical Chemistry,1996,418(1-2):9. |
| [8] | Coutanceau C;Demarconnay L;Lamy C et al.[J].Journal of Power Sources,2006,156(01):14. |
| [9] | Anderson AB.;Seong S.;Grantscharova E. .SYSTEMATIC THEORETICAL STUDY OF ALLOYS OF PLATINUM FOR ENHANCED METHANOL FUEL CELL PERFORMANCE[J].Journal of the Electrochemical Society,1996(6):2075-2082. |
| [10] | Toda T;Igarashi H;Watanabe M .[J].Journal of Electroanalytical Chemistry,1999,460(02):258. |
| [11] | Gotz M.;Wendt H. .Binary and ternary anode catalyst formulations including the elements W, Sn and Mo for PEMFCs operated on methanol or reformate gas[J].Electrochimica Acta,1998(24):3637-3644. |
| [12] | Radmilovic V.;Ross PN.;Gasteiger HA. .STRUCTURE AND CHEMICAL COMPOSITION OF A SUPPORTED PT-RU ELECTROCATALYST FOR METHANOL OXIDATION[J].Journal of Catalysis,1995(1):98-106. |
| [13] | Wang Z B;Yin G P;Zhang J et al.[J].Journal of Power Sources,2006,160(01):37. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%