CAJ | 학술논문

通过热解自聚合多巴胺法制备了氮掺杂空心碳微球(N-HCMS),并采用微波辅助乙二醇还原方法把Pt纳米粒子负载于N-HCMS上制得了Pt/N-HCMS催化剂.催化剂的表面形貌、晶体结构及其比表面积和孔径分布等分别采用扫描电子显微镜、透射电子显微镜、X射线衍射仪及比表面分析仪等进行表征.采用循环伏安法和线性扫描伏安法研究了Pt/N-HCMS催化剂在酸性条件下的电催化氧还原性能. Pt/N-HCMS催化剂由于Pt纳米粒子的均匀分散、N-HCMS载体的快速电子传递及其独特的微孔和中空结构而具有很高的电催化氧还原活性,其质量比活性是E-TEK Pt/C催化剂的近两倍. Pt/N-HCMS催化剂还具有优良的稳定性.本工作对于开发高性能的燃料电池阴极催化剂具有重要意义.
통과열해자취합다파알법제비료담참잡공심탄미구(N-HCMS),병채용미파보조을이순환원방법파Pt납미입자부재우N-HCMS상제득료Pt/N-HCMS최화제.최화제적표면형모、정체결구급기비표면적화공경분포등분별채용소묘전자현미경、투사전자현미경、X사선연사의급비표면분석의등진행표정.채용순배복안법화선성소묘복안법연구료Pt/N-HCMS최화제재산성조건하적전최화양환원성능. Pt/N-HCMS최화제유우Pt납미입자적균균분산、N-HCMS재체적쾌속전자전체급기독특적미공화중공결구이구유흔고적전최화양환원활성,기질량비활성시E-TEK Pt/C최화제적근량배. Pt/N-HCMS최화제환구유우량적은정성.본공작대우개발고성능적연료전지음겁최화제구유중요의의.
@@@@Nitrogen-doped hol ow carbon microspheres (N-HCMS) were synthesized by carbonization of poly(dopamine). Platinum (Pt) nanoparticles (NPs) were deposited onto the N-HCMS via a microwave-assisted reduction process. The morphology, surface area, and pore size distribution of the N-HCMS supported Pt catalysts (Pt/N-HCMS) were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and surface area and porosimetry measurements. The electrocatalytic properties of the Pt/N-HCMS catalyst towards oxygen-reduction reaction were investigated by cyclic voltammetry and linear sweep voltammetry. The Pt/N-HCMS catalyst showed almost double the specific mass activity of a commercial carbon supported Pt catalyst. This was attributed to a uniform dispersion of the Pt NPs and the unique mesoporous and hol ow structure of N-HCMS. In addition, fast electron transfer processes were found to occur on the nitrogen doped N-HCMS and the catalyst exhibited excel ent long-term stability. This work is of significance for the development of high-performance cathodic catalysts in fuel cel s.