title: Carbon-riveted Pt catalyst supported on nanocapsule MWCNTs-Al2O3 with ultrahigh stability for high-temperature proton exchange membrane fuel cells.
abstract: Pt catalyst supported on nanocapsule MWCNTs-Al(2)O(3) (multi-walled carbon nanotubes, MWCNTs) catalyst has been prepared by microwave-assisted polyol process (MAPP). The results of electrochemical measurements show that the nanocapsule Pt/MWCNTs-Al(2)O(3) catalyst has higher activity due to more uniform dispersion and smaller size of Pt nanoparticles, and higher stability ascribed to the stronger metal-support interaction (SMSI) between Pt nanoparticles and nanocapsule support than in Pt/MWCNTs. Furthermore, the carbon-riveted nanocapsule Pt/MWCNTs-Al(2)O(3) catalyst has been designed and synthesized on the basis of in situ carbonization of glucose. The physical characteristics such as X-ray diffraction (XRD), energy dispersive analysis of X-ray (EDAX), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) have indicated that α-Al(2)O(3) indeed entered into the inside of the MWCNTs and formed a nanocapsule support of MWCNTs with α-Al(2)O(3) as stuffing. The accelerated potential cycling tests (APCT) show that carbon-riveted nanocapsule Pt/MWCNTs-Al(2)O(3) possesses 10 times the stability of Pt/C and has 4.5 times the life-span of carbon-riveted Pt/TiO(2)-C reported in our previous work. The significantly enhanced stability for carbon-riveted nanocapsule Pt/MWCNTs-Al(2)O(3) catalyst is attributed to the reasons as follows: the inherently excellent mechanical resistance and stability of α-Al(2)O(3) and MWCNTs in acidic and oxidative environments; SMSI between Pt nanoparticles and the nanocapsule support; the anchoring effect of the carbon layers formed during the carbon-riveting process (CRP); the increase of Pt(0) composition during CRP.
authors.affiliation: School of Chemical Engineering and Technology, Harbin Institute of Technology, No.92 West-Da Zhi Street, Harbin 150001, China.
authors.forename: Zheng-Zhi
authors.initials: ZZ
authors.lastname: Jiang
authors.forename: Zhen-Bo
authors.initials: ZB
authors.lastname: Wang
authors.forename: Wei-Li
authors.initials: WL
authors.lastname: Qu
authors.forename: Harry
authors.initials: H
authors.lastname: Rivera
authors.forename: Da-Ming
authors.initials: DM
authors.lastname: Gu
authors.forename: Ge-Ping
authors.initials: GP
authors.lastname: Yin
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D055664:Electrochemical Techniques; D008872:Microwaves; D053769:Nanocapsules / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011522:Protons; D013696:Temperature
chemical_list: D053769:Nanocapsules; D037742:Nanotubes, Carbon; D011522:Protons; D010984:Platinum; D002244:Carbon; D000537:Aluminum Oxide