서지주요정보
YSZ과 NASICON을 이용한 Bi-electrolyte $CO_2$ 센서에 대한 연구 = Study on the Bi-electrolyte $CO_2$ sensor based on YSZ and NASICON
서명 / 저자 YSZ과 NASICON을 이용한 Bi-electrolyte $CO_2$ 센서에 대한 연구 = Study on the Bi-electrolyte $CO_2$ sensor based on YSZ and NASICON / 박창헌.
저자명 박창헌 ; Park, Chang-Heon
발행사항 [대전 : 한국과학기술원, 2005].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8016106

소장위치/청구기호

학술문화관(문화관) 보존서고

MAME 05003

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Until now, the NDIR typed physical sensor has been used which is precise but expensive, large and difficult to maintain, which requires development of electrochemically potentiometric typed $CO_2$ sensors with good selectivities, technological simplicity, quantitative characteristics, compactness, and low price. The first potentiometric $CO_2$ sensor based on carbonates was proposed by Gauthier et al. This typed sensor was $K_2CO_3-electrolyte$ based symmetrical cell using a reference gas, which had the gas sealing problem. A few years later, Maruyama et al. developed the tip-shaped $CO_2$ sensor based on NASICON electrolyte, working with the sensing electrode made of sodium carbonate and the open reference electrode. However, thermodynamically undefined status of the reference electrode caused the sensor to show the high drift effect. To solve this problem, Maier et al. developed $CO_2$ sensor with the reference electrode using the two phase mixture, which was not easily controlled and had poor reproducibility of synthesizing the reference material. So the key factor is that the reference electrode should make the potential fixed in the sensing performance. In this study, YSZ was adopted as a material of reference electrode and NASICON was chosen as a sodium ion conductor which led the bi-electrolyte typed $CO_2$ sensor to be created. Difficulty of sintering the pelletized NASICON and perfectly bonding between NASICON and YSZ was solved by thermal diffusion. Calcined and cold isostatic pressed NASICON pellet was successfully coupled with YSZ by thermal diffusion. $CO_2$ sensors fabricated by the simple and new technique showed good sensitivity up to theoretical values and good short term durability in various $CO_2$ concentrations. Furthermore, in terms of activity of sodium oxide, the small deviation from the value obtained by T. Maruyama et. al. and G.M. Kale et al. was shown. When fabricating bi-electrolyte $CO_2$ sensors, $Na_2CO_3$, $Na_2CO_3-BaCO_3$ mixture (1:1.7 molar ratio), and $Na_2CO_3-BaCO_3-SiO_2$ (nano-silica, 5.9 weight percent) mixture were used as auxiliary phases and YSZ was used as a reference material. The structure of this new typed sensor was as followed

상용화된 광방식의 이산화탄소 센서는 비싸고 계속적인 유지 보수가 요구되므로 값싸고 기술적으로 간단한 전기화학식 센서의 개발이 요구되고 있다. 이제껏 개발된 전기화학식 센서는 기준전극에서 열역학적으로 정의가 잘 되지 않아서 기준전극을 대체가능한 음이온 전해질을 이용해서 양이온 전해질과 접합한 이산화탄소 센서를 개발하였다.

서지기타정보

서지기타정보
청구기호 {MAME 05003
형태사항 ii, 45 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Chang-Heon Park
지도교수의 한글표기 : 박종욱
지도교수의 영문표기 : Chong-Ook Park
학위논문 학위논문(석사) - 한국과학기술원 : 신소재공학과,
서지주기 참고문헌 : p. 41-45
주제 양이온
음이온
접합
이산화탄소
센서할당법
Bielectrolyte
$CO_2$
NASICON
Bit and Power AllocationationScheme
Arithmetic Codingnse Boundary(MPB)
Landau-Devonshire free energy equation
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