Au核壳纳米催化剂的制备及性能研究

Preparation of Au Core-shell Nano-catalyst and Its Catalytic Performance

采用化学镀工艺,制备了催化性能优良的Au核壳结构纳米催化剂,表面Au颗粒粒径约为16nm,结构致密,单分散程度较高。利用扫描电子显微镜(SEM)和紫外-可见分光光度计(UV-Vis),结合产H2量测试,研究了络合剂和还原剂的加入顺序对Au核壳结构纳米催化剂催化性能的影响。结果表明:先加络合剂所制备样品在亚甲基蓝脱色反应中表现出最高的反应速率和产氢量,具有最高的催化反应活性。较高的纳米Au颗粒粗糙度和Au负载量是其取得优良催化活性的原因。

Au core - shell nano - catalyst with excellent catalytic performance was prepared by electroless plating technology, and the diameter of Au particles on the surface was around 16 nm with a narrow distri- bution. The influence of adding order of complexing agent and reducing agent on the catalytic performance was investigated by SEM, UV -Vis spectrometer, and guantity of H2 production in the progress of the cat- alytic reaction. It was found that the sample prepared with the order of adding complexing agent first showed the highest reaction rates, H2 production, and catalytic activity. The higher loading and surface roughness of Au nanoparticles were responsible for the excellent catalytic performance of the Au core - shell nano - catalyst.