热处理对Pt纳米线电催化性能的影响

采用阳极氧化铝(AAO)模板法电化学沉积制备了Pt纳米线催化剂,并进行了热处理。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学测试对热处理前后Pt纳米线催化剂的晶体结构、形貌和电催化性能进行了表征,并与商业碳载铂(Pt/C)做对比。SEM照片表明制备了表面粗糙的Pt纳米线。循环伏安法(CV)和计时电流曲线表明,Pt纳米线较Pt/C催化活性高,退火后Pt纳米线更利于甲醇氧化,且稳定性更好。旋转圆盘电极(RDE)测试研究发现,未经热处理的Pt纳米线催化剂氧还原反应(ORR)极化曲线的半波电势相对Pt/C有正移,有更大的极限扩散电流,利于氧还原反应的发生。

Influence of Heat Treatment on Electrocatalytic Properties of Pt Nanowires

Pt nanowires (NWs) catalyst was fabricated by electrodepositing with anodic aluminum oxide (AAO) as a template, followed by heat treatment. The crystal structure, morphology and electrocatalytic performance of the as-deposited platinum nanowires catalyst were characterized by X-ray diffraction, scanning electron microscopy (SEM), and electrochemical measurements. As a comparison, commercial Pt/C was tested using the same method. The SEM images show that the surface of platinum nanowires is rough. The cyclic voltammetry (CV) and Chronoamperograms reveal that the Pt NWs catalyst possesses a better catalytic capability for methanol oxidation and catalytic durability than Pt/C. The half wave potential in the oxygen reduction reaction curves of the Pt NWs catalyst is more positive than that of Pt/C. Moreover, Pt NWs catalyst gives higher limiting diffusion current from the rotating disk electrode (RDE) measurement, which is helpful for oxygen reduction reaction.