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Carbon Au -based low temperature fuel cell anode catalyst electrochemical properties

Author: LiHongBin
Tutor: YangXiKun
School: Kunming University of Science and Technology
Course: Materials Physical Chemistry,
Keywords: Core @ shell structure Direct methanol fuel cell Direct formic acid fuel cell For electronic interaction
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 41
Quote: 0
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Abstract


Fuel cell combines high efficiency, no pollution, no noise, wide, continuous work, etc., and has broad application prospects. How to improve the existing platinum catalyst activity, anti-poisoning ability and efficiency, or developed efficient, low-price non-platinum catalysts in fuel cell commercialization solved key technical problems. Methanol, ethanol, formic acid and other small organic molecules is an important fuel source for a fuel cell. In this thesis a strong electro-negativity of precious metals Au nucleus (X = 2.4), with high catalytic activity Pt, Pd nanoparticles as catalyst composite shell. Checked using the Au Pt (or Pd) shell electron role in promoting the shell metal electro-catalytic oxidation activity. Photochemical synthesis of Au core @ Pt shell and Au @ Pd core shell composite nanoparticles as catalyst material, the composite nanoparticles supported on XC-72 carbon black carrier, prepared Au core @ Pt shell / C and Au @ Pd core shell / C catalyst. After cyclic voltammetry (CV), linear sweep voltammetry (LSV) and time - current (IT) test, indicating that the two pairs of noble metal catalysts for methanol (or formic acid) of the electro-catalytic oxidation have high catalytic activity and good stability. While the composite catalyst of high activity mechanism was discussed. The main conclusions are as follows: (1) through UV-Vis absorption spectra, TEM, XPS and other characterization methods analysis confirmed the Au @ Pt and Au @ Pd bimetallic nanoparticles with core - shell composite structure, when the shell metal Pt (or Pd ) molar ratio is lower bimetallic nanoparticles do not form a complete shell, but the formation of strawberry-shaped Au core @ Pt (or Pd) shell composite nanoparticles; (2) XPS analysis showed that, Au core @ Pt shell composite nanoparticles and core shell composite Au @ Pd nanoparticles, Au check dissimilar metals (Pt, Pd) have obvious for shell electrons, the size of the electron effect of the concentration of Au, Au with the increase of the concentration; (3) Electrochemical analysis showed: Au core @ Pt shell nanoparticles and Au core @ Pd Nanoparticles and bimetallic catalysts for methanol and formic acid electro-catalytic oxidation of high activity, indicating Au checking Pt (or Pd) has a role in promoting the shell, thereby increasing the Au core @ Pt shell and Au core @ Pd shell nanoparticles composite structure electrocatalytic activity. Description Au core @ Pt (or Pd) shell nanoparticles, Au check dissimilar metals (Pt, Pd) for the electronic housing has effect; (4) Au: Pd 4:1 Au @ Pd / C catalyst Hcooh Oxidation no catalytic activity, probably due to Pd particles do not form a complete shell, but the formation of strawberry @ Pd Au core shell composite nanoparticles, nanoparticles, Pd lattice discontinuity, lack of catalytic activity caused by other reasons position.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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