CAJ | 학술논문

采用静电纺丝技术结合还原浸渍法制备了Pt/TiO2纳米纤维电催化剂,通过X射线衍射(XRD)分析、扫描电镜(SEM)、透射电镜(TEM)和X射线能谱(EDS)等测试手段对样品的晶相、形貌、微结构和化学组成进行了表征.测试结果表明, TiO2纳米纤维为锐钛矿和金红石组成的混晶, Pt纳米颗粒均匀地分布于TiO2纳米纤维的表面,且Pt颗粒大小较均一,平均粒径为4.0 nm, Pt/TiO2纳米纤维中Pt的质量分数约为20%.采用三电极体系的循环伏安和计时电流电化学分析方法研究了样品在酸性溶液中对甲醇的电催化氧化活性,结果表明,与负载相同质量分数Pt的Pt/P25和商业Pt/C催化剂相比较, Pt/TiO2纳米纤维催化剂对甲醇呈现出较高的电催化氧化活性和更好的稳定性.
채용정전방사기술결합환원침지법제비료Pt/TiO2납미섬유전최화제,통과X사선연사(XRD)분석、소묘전경(SEM)、투사전경(TEM)화X사선능보(EDS)등측시수단대양품적정상、형모、미결구화화학조성진행료표정.측시결과표명, TiO2납미섬유위예태광화금홍석조성적혼정, Pt납미과립균균지분포우TiO2납미섬유적표면,차Pt과립대소교균일,평균립경위4.0 nm, Pt/TiO2납미섬유중Pt적질량분수약위20%.채용삼전겁체계적순배복안화계시전류전화학분석방법연구료양품재산성용액중대갑순적전최화양화활성,결과표명,여부재상동질량분수Pt적Pt/P25화상업Pt/C최화제상비교, Pt/TiO2납미섬유최화제대갑순정현출교고적전최화양화활성화경호적은정성.
A Pt/TiO2 nanofiber catalyst has been prepared through the combination of an electrospinning technique with a reductive impregnation method. The compositions, morphologies and structures of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS). The results showed that the crystal phase of the TiO2 nanofibers was composed of anatase and rutile TiO2. Pt nanoparticles were found to be uniformly distributed on the surface of the TiO2 nanofibers with an average size of 4.0 nm. The mass fraction of Pt in the Pt/TiO2 nanofiber catalyst was about 20%. The electrocatalytic activities of the samples towards the oxidation of methanol were measured by cyclic voltammetry and chronoamperometry using a three-electrode system in an acidic solution. Compared with Pt/P25 and commercial Pt/C catalysts containing the same quality percentage of Pt nanoparticles, the Pt/TiO2 nanofiber catalyst exhibited higher catalytic activity towards the oxidation of methanol and better stability.