【摘要】 以Se溶胶为模板,合成了多层核壳结构的Se@Pt@Au@Pt实心纳米粒子;采用化学与电化学相结合的除硒方法制得了(PtAuPt)HN/GC,并表征了(PtAuPt-Se)HN的表面形貌、结构与组成;以甲酸为探针分子,比较了(PtAuPt)HN/GC和Pt/C/GC对甲酸氧化的电催化行为,发现(PtAuPt)HN/GC催化甲酸氧化只有1个氧化峰,峰电位和峰电流分别约为0.35V和1.22mA/cm2,而Pt/C/GC则有2个氧化峰,在0.35V时所对应的电流密度仅约为0.30mA/cm2,前者在该电位时的电流密度是后者的4倍;在0.30mA/cm2的电流密度下,(PtAuPt)HN/GC对应的电极电位为0.01V,比Pt/C/GC负移了340mV;在600s时的计时电流分别为0.06和0.02mA/cm2.(PtAuPt)HN对甲酸氧化的电催化活性不但比Pt/C高,而且具有一定的抗CO中毒性能.更多还原

【Abstract】 Se@ Pt@ Au@ Pt multilayer core-shell nanoparticles were synthesized in bulk using selenium colloids as template. After removing the selenium template by chemical method,Pt-Au-Pt hollow nanospheres[( PtAuPt-Se)HN],which containing a small amount of residual selenium,were synthesized and used to modify GC electrode. After the residual selenium were removed from( PtAuPt-Se)HN/ GC by electrochemical method,( PtAuPt)HN/ GC was obtained. Scanning electron microscopy( SEM), transmission electron microscopy( TEM),energy dispersive X-ray spectrocopy( EDS) and X-ray diffraction( XRD) were used to characterize their surface morphologies,structures and compositions. The electrocatalytic oxidation activity of( PtAuPt)HN/ GC and Pt / C / GC were measured by using formic acid as a probe molecule. Cyclic voltammogram( CV) reveals that the current density of the formic acid oxidation on( PtAuPt)HN/ GC was four times as large as that of the latter when the potential was 0. 35 V. The potential of( PtAuPt)HN/ GC was shifted negatively about 340 mV compared to the Pt / C / GC when the current density was 0. 30 mA / cm2. The chronoamperometry of( PtAuPt)HN/ GC and Pt / C / GC was 0. 06 and 0. 02 mA / cm2 respectively after 600 s. The results show that the electrocatalytic activity of( PtAuPt)HNfor formic acid oxidation was significantly higher than that of Pt / C.更多还原