Abstract

An active coating, composed of a mixture of nanocrystals of RuO₂ with the rutile structure and nanocrystals of metal Pt, was thermally synthetized on a titanium substrate. Cyclic voltammograms and polarization curves showed that the catalytic activity of the coating for the formic acid oxidation in an acidic solution increased with an increase in the RuO₂ content, reaching the maximum value at 50 mol % RuO₂. Additionally, further increase in the RuO₂ content resulted in a decline of the catalytic activity. The catalytic effect was attributed to a bifunctional mechanism and an electronic effect. The bifunctional mechanism had a dominant role and was based on the fact that Ru–OH species were formed on Ru atoms of RuO₂ at more negative potentials than on Pt. Those species oxidized the adsorbed CO_ad and HCOO_ad—species on adjacent Pt atoms of clusters of metal Pt and thus discharge them to oxidize new HCOOH molecules.

中文翻译：

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Ti上RuO 2和Pt纳米粒子的混合物作为直接甲酸燃料电池的高效催化剂

摘要

由钛金红石结构的RuO ₂纳米晶体和金属Pt纳米晶体的混合物组成的活性涂层在钛基底上热合成。循环伏安图和极化曲线表明，涂层在酸性溶液中对甲酸氧化的催化活性随RuO ₂含量的增加而增加，在50 mol％RuO _2时达到最大值。另外，RuO ₂含量的进一步增加导致催化活性下降。催化作用归因于双功能机理和电子作用。双功能机制起主要作用，并且基于以下事实：Ru-OH物种形成在RuO _2的Ru原子上负电位比铂更高。这些物种氧化被吸附的CO_的广告和HCOO_广告上金属的Pt的簇的相邻的Pt原子-species并因此放电它们以氧化新HCOOH分子。