论文部分内容阅读
纳米尺度的金由于常表现出有趣的尺寸效应和物理化学特性而被大量应用于催化反应中,但是其在电催化反应中的应用却十分有限.本文以水为溶剂、HAuCl_4为前驱体、十二烷基聚乙二醇醚(Brij 35)等为软模板剂、NaBH_4为还原剂、活性碳或石墨烯为载体,在温和反应条件下获得担载型金纳米电催化剂.本文考察并优化了关键制备参数和样品纯化方法,最终确定NaBH_4的最佳浓度区间为5~10 mmol·L~(-1),Brij 35的最佳浓度约为1mmol·L~(-1),在3~16oC下金纳米颗粒的尺寸容易控制,石墨烯和活性碳(EC600)是金纳米颗粒的良好载体.在优化的反应条件下,金纳米颗粒的粒径可以被控制在1~4 nm.热处理法可以有效去除表面活性剂,纯化后的担载型纳米金电催化剂在醇类小分子的氧化反应中表现出良好的性能.
Nano-scale gold has been widely used in catalytic reactions because of its often interesting size and physicochemical properties, but its application in electrocatalysis is very limited.In this paper, water as a solvent, HAuCl_4 as a precursor, (Brij 35) as soft template, NaBH 4 as reductant, activated carbon or graphene as carrier, and supported gold nanocatalyst under mild reaction conditions.This paper reviews and optimizes Key preparation parameters and sample purification methods, the optimal concentration range of NaBH_4 was 5 ~ 10 mmol·L -1 and the optimum concentration of Brij 35 was about 1 mmol·L -1. At 3 ~ 16oC The size of gold nanoparticles is easy to control, and graphene and activated carbon (EC600) are good carriers for gold nanoparticles. Under optimized reaction conditions, the particle size of gold nanoparticles can be controlled at 1 ~ 4 nm. The surfactant is effectively removed, and the purified supported nano gold electrocatalyst shows good performance in the oxidation reaction of small alcohol molecules.