(An) investigation of the electrochemical reactions and electrostatic interactions at the interfaces between nanoporous fractal carbon electrodes and non-aqueous/aqueous electrolytes = 나노 다공성 프랙탈 탄소 전극과 비수용 및 수용계 전해질 계면에서의 전기화학반응과 정전기적 상호작용에 관한 연구

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The present work involves an investigation of the electrochemical reactions and electrostatic interactions at the interfaces between nanoporous fractal carbon electrodes and non-aqueous/aqueous electrolytes. In chapter III, electrochemical reactions at the interface between mesoporous carbon electrode and $SOCl_2$ electrolyte in $Li-SOCl_2$ battery were investigated using galvanostatic discharge experiment and ac-impedance spectroscopy. From the analysis of the high frequency arc in a Nyquist plot of the ac-impedance spectra, it was observed that, as discharge progressed, there appeared a low to high transition in the average growth rate of the primary film over a narrow range of depth of discharge, regardless of discharge current. The inclined line in the intermediate frequency range associated with the secondary layer revealed that there existed also a transition of the straight line with a phase angle higher than 4˚ to the convex line with a phase angle lower than 45˚ with progressing depth of discharge, regardless of discharge current. A conventional transmission line model was modified in order to numerically analyse the ac-impedance spectra for the non-cylindrical pores comprising the porous secondary layer based upon a series combination of the position-dependent resistance and capacitance in value. From the coincidence in shape of the impedance spectra experimentally measured with those theoretically calculated in the intermediate frequency range, it was concluded that there occurred a transformation of the conically shaped pores to the warhead-shaped pores comprising the secondary layer with progressing depth of discharge. The compactness of the secondary layer increased with progressing depth of discharge below and above the transition depth of discharge. The transition cathodic overpotential at which both the transition depth of discharge for the primary layer and the secondary layer just appeared was measured to be about between 360 and 400 mV, re...
Advisors
Pyun, Su-Il변수일
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237589/325007 / 000995100
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2004.2, [ xv, 192 p. ]

Keywords

ELECTROCHEMICAL REACTION; ELECTROLYTE; FRACTAL; NANOPOROUS CARBON ELECTRODE; ELECTROSTATIC INTERACTION; 정전기적 상호작용; 전기화학반응; 전해질; 프랙탈; 나노 다공성 탄소 전극

URI
http://hdl.handle.net/10203/49784
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237589&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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