Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA.
Phys Chem Chem Phys. 2012 Jan 28;14(4):1412-7. doi: 10.1039/c1cp23183a. Epub 2011 Dec 9.
Butylphenyl-functionalized Pt nanoparticles (Pt-BP) with an average core diameter of 2.93 ± 0.49 nm were synthesized by the co-reduction of butylphenyl diazonium salt and H(2)PtCl(4). Cyclic voltammetric studies of the Pt-BP nanoparticles showed a much less pronounced hysteresis between the oxidation currents of formic acid in the forward and reverse scans, as compared to that on naked Pt surfaces. Electrochemical in situ FTIR studies confirmed that no adsorbed CO, a poisoning intermediate, was generated on the Pt-BP nanoparticle surface. These results suggest that functionalization of the Pt nanoparticles by butylphenyl fragments effectively blocked the CO poisoning pathway, most probably through third-body effects, and hence led to an apparent improvement of the electrocatalytic activity in formic acid oxidation.
采用正丁基苯重氮盐和 H(2)PtCl(4)共还原法制备了平均核心直径为 2.93 ± 0.49nm 的丁基苯功能化的 Pt 纳米粒子（Pt-BP）。Pt-BP 纳米粒子的循环伏安研究表明，与裸露的 Pt 表面相比，在正向和反向扫描中甲酸氧化电流之间的滞后现象要小得多。电化学原位 FTIR 研究证实，Pt-BP 纳米粒子表面没有生成吸附的 CO，即一种毒化中间体。这些结果表明，Pt 纳米粒子的丁基苯片段功能化有效地阻止了 CO 毒化途径，这很可能是通过三体效应实现的，从而导致甲酸氧化的电催化活性明显提高。
