Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 15, Pages 4731-4735Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.01.056
Keywords
Direct methanol fuel cell; Electrocatalyst; Oxygen reduction reaction; Polyphthalocyanine cobalt; Stability
Funding
- National Natural Science Foundation of China [20776081]
- Natural Science Foundation of Shandong Province [Y2006837]
Ask authors/readers for more resources
In this work, a novel catalyst is prepared by dispersing planar polyphthalocyanine cobalt (PPcCo) synthesized by polymerizing cobalt (II)-4, 4',4,4''' phthalocyanine tetracarboxylic acid (TcPcCo) using a high surface area carbon powder (Vulcan XC 72), and then heat-treated in argon (Ar) atmosphere. The polymer and PPcCo/C catalysts are characterized systematically by a variety of methods, such as ultraviolet-visible (UV-vis) spectrophotometer, Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscope (TEM). Results show that the PPcCo obtained is stable below 600 degrees C. The active site of PPcCo/C is CoN4 in phthalocyanine ring, and the PPcCo is dispersed homogeneously on the surface of XC 72. Electrocatalytic properties and electrochemical stability of the catalysts in 0.5 mol L-1 H2SO4 are evaluated by RDE measurements. The initial potential for O-2 reduction in O-2-saturated H2SO4 is 0.81 V and it catalyzed O-2 reduction mainly through a four-electron process. Almost no performance degradation is observed over continuous cyclic voltammetry (CV) at 10,000 cycles (4 days). Polarization curves obtained by linear sweep voltammetry (LSV) at 200 cycles also show no change. PPcCo/C catalysts display significant electrocatalytic performance for O-2 reduction, tolerance towards methanol, and long-term stability. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available