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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 18, Number 6
JKCSEZ 18(6)
December 20, 1974 

A Kinetic Study on the Aluminum Electrode in Molten 60 Mole Percent AlCl3-40 Mole Percent NaCl at 453°K

용융 (60 몰% AlCl3-40 몰% NaCl) 염 속에서의 알루미늄전극의 반응속도론적 연구
G. F. Uhlig, T. N. Andersen, S. Johns, H. Eyring
60몰% AlCl3-40몰% NaCl의 용융염(453。K)속에든 알루미늄 전극에 대하여 전류-전압 편극곡선을 얻었다. 50mA/㎠보다 큰 전류밀도에서는 옴-저항에 의한 전위차가 양극전위에 상당히 기여하므로 저항이 큰 AlCl3(혹은 AlCl3 의 농도가 큰 멜트)의 층이 양극표면에 가까이 형성된다고 결론지었다. IR-전위차에 대하여 보정한 후의 Tafel곡선과 Allen-Hickling 곡선으로 부터 겉보기 transfer-coefficient, αa=(2.3RT/F)(dlogi/dη)=1.5±0.25가 얻어졌다. 약 30mA/㎠보다 큰 음극전류밀도에서는 느린 이온확산과 dendrite 생장 때문에 속도론적 측정이 방해 받았다.

Steady-state anodic and cathodic polarization curves were developed for the Al electrode in 60 mole % AlCl3-40 mole % NaCl at 180℃(453˚K). Ohmic resistance contributed substantially to the anodic polarization at current densities greater than 50 mA/cm2 even with capillary tip placed close to the electrode. This could not be rationalized from the resistivity of the melt, which would lead to a much smaller polarization. It was therefore concluded that a layer of high resistance AlCl3 (or AlCl3-rich melt) formed close to the anode surface. From the IR-corrected anodic Tafel and Allen-Hickling plots an apparent anodic charge-transfer coefficient of αa = (2.3 RT/F)(d log i/dη) = 1.5±0.25 was obtained. At cathodic current densities greater than approximately 30 mA/cm2, slow ion diffusion and dendrite growth both interfered with the measurement of kinetic parameters.

400 - 407
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