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RISS 인기검색어
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- 저자 : 오승모 (검색결과 173 건)
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Ni-P Coated Sn Powers as Anode for Lithium Secomdary Batteries
오승모,조용남,임동민,김재정 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
Nano-sized Sn particles were coated with Ni-P layer using an electroless deposition method and theiranodic performance was tested for lithium secondary batteries. Uniform coating layers were obtained, of which thethickness was controlled by varying the Ni2+ concentration in the plating bath. It was found that the Ni-P layer playstwo important roles in improving the anodic performance of Sn powder electrode. First, it prevents the inter-particleaggregation between Sn particles during the charge/discharge process. Second, it provides an electrical conduction path-way to the Sn particles, which allows an electrode fabrication without an addition of conductive carbon. A pseudo-1) even without conductive carbon loading.
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오승모,가복현,윤성훈 한국전기화학회 2007 한국전기화학회지 Vol.10 No.4
A series of spherical porous carbons were prepared via resorcinol-formaldehyde (RF) sol-gel polymerizationhylammonium bromide), wherein the carbon sphere size wascontrolled by varying the CTAB introduction time after a pre-determined period of addition reaction (termed as pre-curing). The sphere size gradually decreases with an increase in the pre-curing time within the range of 30-150nm. The carbons possess two types of pores; one inside carbon spheres (intra-particle pores) and the other at theinterstitial sites made by carbon spheres (inter-particle pores). Of the two, the surface exposed on the former wasdominant to determine the electric double-layer capacitor (EDLC) performance of porous carbons. As the intra-particlepores were generated inside RF gel spheres by gasification, the pore diameter was similar for all these carbons,or controlling the EDLC performance. The charge-dischargevoltage profiles and complex capacitance analysis consistently illustrate that the smaller-sized RF carbons deliver abetter rate capability, which must be the direct result of facilitated ion penetration into shorter pores.
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기능성 전극의 전기촉매로의 응용 - Poly - MePMP+BF4- / Ferri - ferrocyanide / Ascorbic Acid 계
장동훈,오승모 ( Dong Hun Chang,Seung Mo Oh ) 한국공업화학회 1992 공업화학 Vol.3 No.1
Chemically-modified electrodes were fabricated and their electrocatalytic behaviors have been investigated. As a modifying layer, poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium] was electropolymerized onto Pt electrodes under constant current. The thickness of the polymer film was controlled by means of total charge consumed during the electropolymerization. SEM was used to measure the thickness. There was a linear relationship between the passed charge and the film thickness. Ferro/ferricyanide, used as an electron mediator in this study, was rapidly ion-exchanged into the polymer layer with its concentration of 1.2∼1.3M. It was found that electrooxidation of ascorbic acid is catalyzed by incorporated ferri/ferrocyanide couple. Kinetic parameters for elecrooxidation were determined by RDE experiments. The results indicate that the present system corresponds to ER+S case based on the Saveant theory. Improving methods have been proposed to be R+S case which is ideal for electrocatalysis.
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