Sains Malaysiana 29: 187-196 (2000)                                                                           Sains Fizis dan Gunaan /

Physical & Applied Sciences

X-Ray Photoelectron Spectroscopy Analysis of  Nafion^®

117 Electrolytic Membrane

Amir H. Khadum, Wan Ramli Wan Daud

Abu Bakar Mohamad, Mohammad H. Rasheed

Department of Chemical Engineering

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

Ambar Yarmo

School of Chemistry and Food Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia.

ABSTRACT

A study of elemental and chemical composition of Nafion® 117 electrolytic surface was conducted using X-ray photoelectron spectroscopy. The major chemical compositions of the membrane surface were mainly fluorine, car­bon, oxygen, sulphur and titanium with mass concentration percentage of 60.22, 24.54, 11.52, 2.40 and 1.32, respectively. The curve fitting for carbon spectrum indicates three C-F namely, F₂-C, F-C and F₃-C chemical environments; two types of oxygen chemical environments, O₃-S and CF-O-­CF₂.  In addition, one type of fluorine environment; one type of sulphur environment, S-O₃ and one type of titanium environment, Ti-O are found on the surface of the membrane.

ABSTRACT

Kajian mengenai komposisi unsur dan kimia permukaan membran elektrolit Nafion® 117 telah dijalankan dengan menggunakan spektroskopi fotoelektron sinar-X. Komposisi kimia utama membran ini ialah fluorin, karbon, oksigen dan titanium dengan peratus kepekatan masing-masing 60.22, 24.54, 11.52, 2.40 dan 1.32. Suaian lengkung bagi spektrum karbon menunjukkan wujudnya tiga jenis sekitaran C-F iaitu, F₂-C, F-C dan F₃-C, dua jenis sekitaran oksigen iaitu  O₃-S dan CF-O-CF₂.  Selain daripada itu, satu jenis sekitaran fluorin, satu jenis sekitaran sulfur, S-O₃ dan satu jenis sekitaran titanium, Ti-O didapati pada permukaan membran ini.

RUJUKAN/REFERENCES

Gort. W. 1972. Perfluoriete Ionenaustauscher-Membrane von hoher chemischer und thermischer Stabilitat. Chemie-.lng. Techn. 44, 167-172.

Grubb. W.T 1959. Batteries with solid ion Exchange Membrane. J. Electrochem. Soc., 106: 275-279.

Kratos. 1979. Hand Book of X-ray Photoelectron Spectroscopy. 121-123.

Moulder, I.R., Stickle, W.F., Sobol P.E. & Bomben, K.D. 1992. Hand Book of X-ray Photoelectron Spectroscopy. Perkin-Elmer Corporation, Eden Prairie, Min­nesota 55344, USA.

Orchard A. F., 1977. Hand Book of X-ray and Ultraviolet Photoelectron Spectroscopy, ed. D. Briggs Heyden, London.

Otoka E.P., Hellman M.Y., & Blyer, L. L. 1969. Terminal-Group Association in Carboxyl and Carboxylate-terminal polybutane. J. Apl. Phys. 40: 4221-4225.

Scibona G., Fabiani, C & Scuppa, B 1983. Electrochemical behavior of nafion type membranes. J. Membrane Science. 16: 37-42.

Wanger C.D., Riggs, W. M., Davis, L.E., Moulder, I. F. & Muilenberg, G. E., 1979. Hand Book of X-ray Photoelectron Spectroscopy. Eden prairie, Minnesota.

Yeo R.S & Yeager, H. L. 1985. Structural and transport properties of perfluorinated Ion-exchange membranes. Modern Aspects of Electrochemistry.