Yin Yanru, Ma Ning, Xue Jing, Wang Guoqiang, Liu Shuibo, Li Hongliang, Guo Peizhi
Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modern Textile, School of Materials Science and Engineering , Qingdao University , Qingdao 266071 , P. R. China.
Langmuir. 2019 Jan 22;35(3):787-795. doi: 10.1021/acs.langmuir.8b04032. Epub 2019 Jan 14.
Four types of palladium (Pd) nanoparticles were prepared from the systems containing PdCl or NaPdCl with or without the assistance of poly(vinylpyrrolidone) (PVP). Two types of Pd nanoparticles obtained in the absence of PVP were obviously larger than those synthesized with the assistance of PVP. The former large Pd particles showed typical features in cyclic voltammetry in HSO solution, whereas two types of small Pd nanoparticles did not. However, small nanoparticles treated first in an electrochemical way in 0.5 M KOH solution displayed the adsorption and desorption peaks similar to those of typical Pd-modified electrodes in HSO solution. Large Pd nanoparticles from the PdCl synthesis system showed a catalytic specific current of 629 mA/mg in the electrocatalysis of ethanol, whereas large particles from the NaPdCl system showed a current of 262 mA/mg. The maximum catalytic currents of small Pd nanoparticles without surface cleaning treatment were 1382 and 1019 mA/mg for samples from the NaPdCl and PdCl systems, respectively, higher than those being treated in KOH solution first, and the electrocatalytic stability of the two untreated samples was better. However, small nanoparticles after the electrochemical treatment can reach the maximum catalytic current faster. The synthesis and structure-property relation of four types of Pd nanoparticles have been discussed and analyzed on the basis of systematically experimental data.
从含有氯化钯（PdCl）或氯钯酸钠（NaPdCl）的体系中，在有或没有聚乙烯吡咯烷酮（PVP）辅助的情况下制备了四种类型的钯（Pd）纳米颗粒。在没有PVP的情况下获得的两种类型的Pd纳米颗粒明显大于在PVP辅助下合成的那些。前者较大的Pd颗粒在HSO溶液的循环伏安法中显示出典型特征，而两种类型的小Pd纳米颗粒则没有。然而，首先在0.5 M KOH溶液中以电化学方式处理的小纳米颗粒显示出与HSO溶液中典型Pd修饰电极相似的吸附和解吸峰。来自PdCl合成体系的大Pd纳米颗粒在乙醇的电催化中显示出629 mA/mg的催化比电流，而来自NaPdCl体系的大颗粒显示出262 mA/mg的电流。未经表面清洗处理的小Pd纳米颗粒，来自NaPdCl和PdCl体系的样品的最大催化电流分别为1382和1019 mA/mg，高于首先在KOH溶液中处理的那些，并且两个未处理样品的电催化稳定性更好。然而，经过电化学处理的小纳米颗粒可以更快地达到最大催化电流。基于系统的实验数据，对四种类型的Pd纳米颗粒的合成及其结构-性能关系进行了讨论和分析。
