CAJ | 학술논문

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0.35 V和1.22 mA/cm2,而Pt/C/GC则有2个氧化峰,在0.35 V时所对应的电流密度仅约为0.30 mA/cm2,前者在该电位时的电流密度是后者的4倍；在0.30 mA/cm2的电流密度下,( PtAuPt) HN/GC对应的电极电位为0.01 V,比Pt/C/GC负移了340 mV；在600 s时的计时电流分别为0.06和0.02 mA/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.
이Se용효위모판,합성료다층핵각결구적Se@Pt@Au@Pt실심납미입자；채용화학여전화학상결합적제서방법제득료(PtAuPt)HN/GC,병표정료(PtAuPt-Se)HN적표면형모、결구여조성；이갑산위탐침분자,비교료( PtAuPt) HN/GC화Pt/C/GC대갑산양화적전최화행위,발현( PtAuPt) HN/GC최화갑산양화지유1개양화봉,봉전위화봉전류분별약위0.35 V화1.22 mA/cm2,이Pt/C/GC칙유2개양화봉,재0.35 V시소대응적전류밀도부약위0.30 mA/cm2,전자재해전위시적전류밀도시후자적4배；재0.30 mA/cm2적전류밀도하,( PtAuPt) HN/GC대응적전겁전위위0.01 V,비Pt/C/GC부이료340 mV；재600 s시적계시전류분별위0.06화0.02 mA/cm2.( PtAuPt) HN대갑산양화적전최화활성불단비 Pt/C고,이차구유일정적항 CO중독성능.
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) HN for formic acid oxidation was significantly higher than that of Pt/C.