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Citation: Hu Gang, Xu Li-Juan, Dong Shao-Jun. SURFACE CHARACTERIZATION OF COBALT TETRAPHENYLPORPHYRIN MODIFIED GLASSY CARBON ELECTRODE BY XPS[J]. Acta Physico-Chimica Sinica, ;1990, 6(06): 710-715. doi: 10.3866/PKU.WHXB19900614 shu

SURFACE CHARACTERIZATION OF COBALT TETRAPHENYLPORPHYRIN MODIFIED GLASSY CARBON ELECTRODE BY XPS

1.
Changchun Institute of Applied Chemistry; Laboratory of Electroanalytical Chemistry; Chinese Academy of Sciences; Changchun; 130022; China

Received Date: 25 May 1989
Available Online: 15 December 1990

Surface structure of the glassy carbon surface modified with cobalt tetraphenyl-porphyrin (CoTPP) by thermal-treatment has been studied by XPS, DTA and TG. During the thermal treatment a bond can be formed between the glassy carbon sur-face and TPP. Therefore the stability of electrode for the catalysis of dioxygen redu-ction is improved. Upon thermal treatment at 600 ℃, FWHM of Co(2p_(3/2)) is broa-dened, the reason is due to overlapping of peaks of multiple states; the spin orbit separation between Co(2p_(1/2)) and Co(2p_(3/2)) increases to 15.5—16.3 eV, which indicates a change from low spin divalent to high spin divalent states; the kinetic energy of Co L_3VV Auger line and Auger parameter also increase. These changes of central cobalt ion provide a suitable redox potential for Co(III)/Co(II) which is related to the activity for catalysis of dioxygen reduction.
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