(PtAuPt)_(HN)/GC的制备及对甲酸氧化的电催化性能  

Preparation of (PtAuPt)_(HN)/GC and Its Electrocatalytic Performance for Formic Acid Oxidation

作　　者：商中瑾 颜亮亮[1] 饶贵仕[1] 熊婷[1] 田伟[1] 林旋[1] 钟起玲[1] 任斌[2] 

机构地区：[1]江西师范大学化学化工学院,南昌330022 [2]厦门大学化学化工学院化学系,固体表面物理化学国家重点实验室,厦门361005

出　　处：《高等学校化学学报》2014年第12期2688-2693,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20663002);厦门大学固体表面物理化学国家重点实验室基金(批准号:200511)资助~~

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.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/cm^2 . The chronoamperometry of （ PtAuPt） HN/GC and Pt/C/GC was 0. 06 and 0. 02 mA/cm^2 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.

关 键 词：铂-金-铂纳米空球 电极 电催化 甲酸氧化 

分 类 号：O646[理学—物理化学]