Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea.
Phys Chem Chem Phys. 2013 Jul 21;15(27):11461-7. doi: 10.1039/c3cp50661d. Epub 2013 Jun 7.
A series of hollow Pd nanoshells are prepared by employing Co nanoparticles as sacrificial templates with different concentrations of a Pd precursor (1, 6, 12, 20, and 40 mM K2PdCl4), denoted hPd-X (X: concentration of K2PdCl4 in mM unit). The synthesized hPd series are tested as a cathodic electrocatalyst for oxygen reduction reaction (ORR) in alkaline solution. The morphology and surface area of the hPd catalysts are characterized using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and cyclic voltammetry (CV). Rotating disk electrode (RDE) voltammetric studies show that the hPd-20 (prepared using 20 mM K2PdCl4) has the highest ORR activity among all the hPd series, while being comparable to commercial Pd and Pt catalysts (E-TEK). The more facilitated ORR at hPd-20 is presumably induced by the enhanced Pd surface area and efficiently high porosity of Pd nanoshells.
一系列中空 Pd 纳米壳通过使用 Co 纳米颗粒作为牺牲模板，并采用不同浓度的 Pd 前体（1、6、12、20 和 40mM K2PdCl4）来制备，记为 hPd-X（X：以 mM 为单位的 K2PdCl4 的浓度）。所合成的 hPd 系列被用作碱性溶液中氧还原反应（ORR）的阴极电催化剂进行测试。使用扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HR-TEM）和循环伏安法（CV）对 hPd 催化剂的形态和表面积进行了表征。旋转圆盘电极（RDE）伏安研究表明，在所有 hPd 系列中，hPd-20（使用 20mM K2PdCl4 制备）具有最高的 ORR 活性，与商业 Pd 和 Pt 催化剂（E-TEK）相当。在 hPd-20 中更有利于 ORR 的发生，可能是由于 Pd 纳米壳的表面积增强和高效的高孔隙率所致。
