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고체 전해질셀에서 바나듐산화물 촉매전극의 특성
Characteristics of V2O5 Catalyst Electrode in Solid Electrolyte Cell
HWAHAK KONGHAK, June 1997, 35(3), 390-395(6), NONE
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Abstract
본 연구에서는 고체 전해질셀의 금속산화물 촉매전극상에서 NEMCA(non-faradaic electrochemical modification of catalytic activity) 현상을 살펴보았다. YSZ에 코팅된 V2O5 촉매전극은 고체 전해질셀(CO, O2, V2O5/YSZ/Ag, O2) 상에서 전극과 촉매의 두 가지 역할을 동시에 수행한다. 전류를 가하지 않을 때 V2O5 촉매전극은 일반적인 CO 산화촉매로의 역할을 수행하였다. 그러나 전류를 가함으로써 개회로에 비해 V2O5의 촉매활성도를 크게 할 수 있었다. CO 분압이 3.2 ㎪ 일 때 가해지는 50 ㎂의 전류에 의해서 개회로와 비교하여 7.7⁓10-9 g-atoms/s의 반응속도의 증가가 일어났다. 그리고 이 때 계산된 향상인자(Λ)는 28.9였다. 이와 같은 현상은 가해진 전류가 V2O5와 흡착제간의 결합력을 약화시킴으로 이해될 수 있었다.
The phenomena of NEMCA(non-faradaic electrochemical modification of catalytic activity) has been studied on metal oxide catalyst electrode in a solid electrolyte cell. The V2O5 catalyst electrode doped on YSZ(yttria stabilized zirconia) served both as a catalyst and as an electrode of the solid electrolyte cell; CO, O2, V2O5/YSZ/Ag, O2. The V2O5 catalyst electrode under open circuit condition played a role of the regular CO oxidation catalyst. Applying current to this system, the catalytic activity of V2O5 catalyst was much higher than under open circuit. When CO partial pressure was 3.2 ㎪ and current of 50 ㎂ was applied, the reaction rate was enhanced to 7.7×10-9 g-atoms/s and the enhancement factor(Λ) was 28.2. It seems that the decrease in the covalent bond strength between V2O5 and adsorbates, resulted from the applied current, enhanced the reaction rate.
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Okamoto H, Obayashi H, Kudo T, Solid State Ion., 1, 319 (1980)
Okmamoto H, Obayashi H, Kudo T, Solid State Ion., 3-4, 453 (1981)
Okamoto H, Obayashi H, Kudo T, J. Catal., 82, 322 (1983)
Okamoto H, Obayashi H, Kudo T, J. Catal., 72, 332 (1983)
Fleming WJ, J. Electrochem. Soc., 124, 21 (1977)
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Hirota K, Kera Y, Teratany S, J. Phys. Chem., 72, 3133 (1968)
Kim ES, Choi KH, Lee HI, J. Korean Ind. Eng. Chem., 5(2), 189 (1994)
