分别在酸性和碱性电解质中研究了界面合金化的纳米Ag承载Pt纳米结构催化剂Pt0.5^Ag-B/C(Pt/Ag原子比为0.5)对氧还原反应(ORR)的电催化特点.结果表明,该催化剂对ORR的半波电势(E1/2)与通常的Pt/C催化剂(E-TEK公司)相当,但前者的本征电催化活性是后者的近两倍.与未合金化的Pt0.5^Ag-A/C相比,在Pt0.5^Ag-B/C催化剂中形成的合金化的Pt/Ag界面不仅使ORR的E1/2正移,而且明显提高了贵金属Pt的分散度或利用率.
参考文献
[1] | Reeve R W;Christensen P A;Hamnett A;Haydock S A Roy S C .[J].Journal of the Electrochemical Society,1998,145:3463. |
[2] | Hara Y;Minami N;Itagaki H .Electrocatalytic properties of ruthenium modified with Te metal for the oxygen reduction reaction[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2008(1):59-66. |
[3] | Schilling T;Bron M .[J].Electrochimica Acta,2008,53:5379. |
[4] | 邓选英,章冬云,王昕,原鲜霞,马紫峰.碳纳米管负载金属卟啉电催化剂制备及其催化活性[J].催化学报,2008(06):519-523. |
[5] | Feng YJ;Alonso-Vante N .Nonprecious metal catalysts for the molecular oxygen-reduction reaction[J].Physica status solidi, B. Basic research,2008(9):1792-1806. |
[6] | Stamenkovic V;Mun B S;Mayrhofer K J J;Ross P N Markovic N M Rossmeisl J Greeley J Nφrskov J K .[J].Angewandte Chemie International Edition,2006,45:2897. |
[7] | Yang H;Vogel W;Lamy C;Alonso-Vante N .[J].Journal of Physical Chemistry B,2004,108:11024. |
[8] | Stamenkovic VR;Fowler B;Mun BS;Wang GF;Ross PN;Lucas CA;Markovic NM .Improved oxygen reduction activity on Pt3Ni(111) via increased surface site availability[J].Science,2007(26):493-497. |
[9] | Zhao D;Xu B Q .[J].Angewandte Chemie International Edition,2006,45:4955. |
[10] | Zhao D;Yan B;Xu BQ .Proper alloying of Pt with underlying Ag nanoparticles leads to dramatic activity enhancement of Pt electrocatalyst[J].Electrochemistry communications,2008(6):884-887. |
[11] | Zhao D;Xu BQ .Platinum covering of gold nanoparticles for utilization enhancement of Pt in electrocatalysts[J].Physical chemistry chemical physics: PCCP,2006(43):5106-5114. |
[12] | 汪远昊,赵丹,徐柏庆.甲酸在纳米金承载铂(Pt^Au)电催化剂上的电化学氧化[J].催化学报,2008(03):297-302. |
[13] | Zhao D;Wang Y H;Yan B;Xu B Q .[J].Journal of Physical Chemistry C,2009,113:1242. |
[14] | Lima F H B;Sanches C D;Ticianclli E A .[J].Journal of the Electrochemical Society,2005,152:A1466. |
[15] | Chatenet M;Aurousseau M;Durand R;Andolfatto E .[J].Journal of the Electrochemical Society,2003,150:D47. |
[16] | Bard A J;Faulkner L R.Electrochemical Methods:Fundamentals and Applications[M].New York:wiley,2001 |
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