摘要
提出了在四氢呋喃(THF)、H_2O和乙醇三元体系中用一般的化学还原法在室温下制备高合金化Pt-Ru/CMK-3催化剂的新方法.与在纯水中制得的商品化ETEK催化剂相比,其Pt-Ru粒子的合金化程度高、平均粒径较小且相对结晶度低,因此,该催化剂对甲醇氧化的电催化活性远高于在纯水中制得的Pt-Ru催化剂.高合金化程度的原因是H_2PtCl_6和RuCl_3在THF、H_2O和乙醇三元溶液体系中的起始还原电位相近.此外,CMK-3以其规整的二维有序孔道结构,为直接甲醇燃烧电池(DMFC)中电子和物质的传输提供了方便的路径,其巨大的比表面积也为Pt-Ru纳米粒子的均匀分散提供了良好的载体.
The Pt-Ru particles of Pt-Ru/CMK-3 catalyst were found to possess high degree of alloying, small average size, and low relative crystallinity when the Pt-Ru/CMK-3 catalyst was prepared using the general chemical reduction method in the ternary solution system containing tetrahydrofuran （THF）, H2O, and ethanol. The Pt-Ru/CMK- 3 catalyst showed high electrocatalytic activity for methanol oxidation. It indicated that the alloying degree of Pt-Ru could significantly affect the electrocatalytic activity for methanol oxidation. The Pt-Ru/CMK-3 catalyst with high alloying degree can be obtained because THF and H2PtCl6 can form a complex leading to the reduction potentials of H2PtCl6 and RuCl3, which are close to each other in the aqueous solution with THF.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第4期559-564,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(50502020)
江苏省高技术项目(BG2005009)
南京航空航天大学科研创新基金资助
