Materials Research Laboratory, Hitachi Ltd., 7-1-1, Omika-cho, Hitachi 319-1292, Japan.
J Colloid Interface Sci. 2010 Nov 15;351(2):580-3. doi: 10.1016/j.jcis.2010.07.067. Epub 2010 Aug 1.
A methanol oxidation catalyst with improved durability in acidic environments is reported. The catalyst consists of PtRu alloy nanoparticles on a carbon support that were stabilized with a silane-coupling agent. The catalyst was prepared by reducing ions of Pt and Ru in the presence of a carbon support and the silane-coupling agent. The careful choice of preparatory conditions such as the concentration of the silane-coupling agent and solution pH resulted in the preparation of catalyst in which the PtRu nanoparticles were dispersively adsorbed onto the carbon support. The catalytic activity was similar to that of a commercial catalyst and was unchanged after immersion in sulfuric acid solution for 1000 h, suggesting the high durability of the PtRu catalyst for the anode of direct methanol fuel cells.
一种在酸性环境中具有改进的耐久性的甲醇氧化催化剂被报道。该催化剂由负载在碳载体上的 PtRu 合金纳米粒子组成,并用硅烷偶联剂进行稳定。该催化剂是通过在碳载体和硅烷偶联剂存在的情况下还原 Pt 和 Ru 的离子来制备的。仔细选择制备条件,如硅烷偶联剂的浓度和溶液 pH 值,导致制备出的催化剂中 PtRu 纳米粒子分散吸附在碳载体上。该催化剂的催化活性与商业催化剂相似,并且在硫酸溶液中浸泡 1000 小时后没有变化,这表明 PtRu 催化剂对于直接甲醇燃料电池的阳极具有高耐久性。