State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering,Hunan University, Changsha 410082, P.R.China
基金项目：
The project was supported by the Program for Changjiang Scholars and Innovative Research Team in University, China(IRT1238);NationalNatural Science Foundation of China(21275041, J1210040, J1103312);长江学者和创新团队发展计划(IRT1238);国家自然科学基金(21275041, J1210040, J1103312)
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering,Hunan University, Changsha 410082, P.R.China
Abstract:
A new methanol-tolerant oxygen reduction electrocatalyst,nitrogen-doped hollow carbon microspheres@platinum nanoparticles hybrids (HNCMS@Pt NPs),has been synthesized by a facile template route.In brief,Pt NPs were loaded on the surface of NH2-functionalized SiO2 microspheres (Pt NPs/SiO2).Then, the Pt NPs/SiO2 hybrids were wrapped by polydopamine (PDA) film.After direct carbonization of PDA-wrapped Pt NPs/SiO2 hybrids under a nitrogen atmosphere and further treatment in a hydrofluoric acid solution,Pt NPs embedded within nitrogen-doped hollow carbon microsphere (HNCMS) were obtained and labeled as HNCMS@Pt NPs.Scanning electron microscopy,transmission electron microscopy,X-ray diffraction,Raman spectroscopy,specific surface area analysis,and X-ray photoelectron spectroscopy were used to characterize the HNCMS@Pt NPs hybrids.The electrochemical properties of the HNCMS@Pt NPs hybrids for oxygen reduction reaction have also been investigated by cyclic voltammetry and linear sweep voltammetry.The results show that the Pt loading mass in the HNCMS@Pt NPs hybrids is up to 11.9%(w,mass fraction).Furthermore, the as-prepared HNCMS@Pt NPs catalyst exhibits good electrocatalytic activity,high stability,and excellent methanol-tolerance toward oxygen reduction reactions,implying potential applications in practical direct 1473 methanol fuel cells (DMFCs) as methanol-tolerant cathodic catalysts.
