Shape-control synthesis of Pd Nanoparticles at room temperature and studies of their Electrocatalytic Properties

本论文运用液相还原法，以氯化胆碱为表面活性剂和稳定剂，在水溶液中室温合成Pd纳米粒子并实现控制其形状，用SEM、TEM表征纳米粒子结构，并运用电化学循环伏安、原位红外光谱等方法研究其电催化性能，及纳米Pd薄膜电极上甲酸电催化特性。主要结果如下： 1.在液相中以吸附弱，易去除的氯化胆碱为稳定剂，实现在室温控制Pd纳米粒子的形状和表面结构。在室温和弱还原剂条件下，制备出具有不规则刺状及台阶位的Pd纳米粒子，进一步调控稳定剂和还原剂的比得到Pd纳米刺。初步研究结果表明，在晶体生长过程中Cl-的氧化刻蚀作用形成了具有台阶位的Pd纳米刺状粒子Pdnthorn，氯化胆碱能通过洗涤而除去，不干扰催化剂性能...In this thesis, Choline Chloride are used as surfactant for Pd Metal Nanocrystals, The sturcture of the synthesized nanoparticles were studied by SEM andTEM . Oxidation of formic acid on Pd nanocrystals was studied by using cyclic voltammetry (CV) and in situ FTIR spectroscopy (in situ FTIRS). The main results are as follows. 1. We developed a novel surfactant to synthesis Pd Metal Nanocrystals w...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：2052007115100

Room Temperature Synthesis of Thorn-Like Pd Nanoparticles and Their Enhanced Electrocatalytic Property for Ethanol Oxidation

Corresponding authors. Email: [email protected],[email protected], Tel:+86-592-2180181.[中文文摘]室温下以氯化胆碱为稳定剂,用化学还原法合成了刺状Pd纳米粒子(Pdtnh0o0r0n).透射电子显微镜和电化学循环伏安研究结果表明Pdtnh0o0r0n具有较高密度的台阶位,与商业Pd黑催化剂相比较,Pdtnh0o0r0n对乙醇氧化的电催化活性显著提高,氧化电流密度是商业Pd黑催化剂的1.2倍(-0.40--0.30V)-1.5倍(-0.65--0.40V),起始氧化电位和峰电位均负移50mV.相同电流密度下,Pdtnh0o0r0n催化剂对乙醇的氧化电位均更低.[英文文摘]Thorn-like Pd nanoparticles (Pdtnh0o0r0n ) were synthesized at room temperature by a reduction of PdCl2 with L-ascorbic acid and with choline chloride as a stabilizer. Characterization of Pdtnh0o0r0n by transmission electron microscopy and cyclic voltammetry indicated that the synthesized Pd tnh0o0r0n has a relatively high density of surface step sites. By comparison with the commercially available Pd black catalyst, Pdtnh0o0r0n exhibits better catalytic activity towards ethanol oxidation. The oxidation current density on Pdthorn n000 was 1.2 times (-0.40 - -0.30 V) - 1.5 times (-0.65 - -0.40 V) as that on Pd black, and the onset potential and the peak potential of ethanol oxidation both shifted 50 mV in the negative direction. The oxidation potential of ethanol on Pdthorn n000 is lower at the same current density.国家自然科学基金(20833005,20873116,60936003); 超分子结构和材料国家重点实验室(SKLSSM200910)资助项