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详细研究了交替微波加热法制备多壁碳纳米管负载Pt催化剂(Pt/MWCNTs)的过程中交替微波加热(5s-on/5s-off)次数对催化剂性能的影响.X射线粉末衍射(XRD)结果表明,Pt的晶粒尺寸在开始的加热阶段基本上没有发生变化,但是随着加热次数的增多,Pt的晶粒尺寸逐步增大.采用循环伏安法和旋转圆盘电极技术考察了催化剂的电化学活性.结果显示,以5s-on/5s-off加热20次时,催化剂显示出最佳的催化活性;在0.5mol·L-1H2SO4饱和氧水溶液中催化剂的氧还原起峰电位接近1.0V(vs RHE).交替微波加热法简单经济,在大批量制备催化剂等纳米材料方面显示出较好的应用前景.
The effect of alternating microwave heating (5s-on / 5s-off) on the catalyst performance during the preparation of Pt / MWCNTs with multi-walled carbon nanotubes by microwave heating was investigated in detail.X-ray powder diffraction (XRD) The results showed that the grain size of Pt did not change basically at the initial heating stage, but the grain size of Pt gradually increased with the increase of the number of heating cycles.The cyclic voltammetry and rotating disk electrode technique were used to investigate the effect of catalyst The results showed that the catalyst showed the best catalytic activity when it was heated for 20 times with 5s-on / 5s-off. The peak potential of oxygen reduction of the catalyst in 0.5mol·L-1 H2SO4 saturated aqueous solution was close to 1.0 V (vs RHE). The alternating microwave heating method is simple and economical and shows a good application prospect in the mass production of nanomaterials such as catalysts.