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Korean Journal of Metals and Materials > Volume 55(11); 2017 > Article
Korean Journal of Metals and Materials 2017;55(11): 819-824. doi: https://doi.org/10.3365/KJMM.2017.55.11.819
용사코팅 YSZ 고체 전해질이 응용된 NiO・YSZ 가스센서의 특성
방일환, 조성용
전남대학교 환경에너지공학과
Characteristics of NiO・YSZ Gas Sensor Employing YSZ Solid Electrolyte Prepared by Thermal Spray Coating Method
Il-Hwan Bang, Sung-Yong Cho
Department of Environment and Energy Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
Correspondence  Il-Hwan Bang ,Tel: +82-62-530-0821, Email: ihbang@jntp.or.kr
Received: 31 May 2017;  Accepted: 21 July 2017.  Published online: 31 October 2017.
ABSTRACT
A mixed potential-type NiO・YSZ (yttria stabilized zirconia) gas sensor employing 8YSZ solid electrolyte film was fabricated using a thermal spray coating method, and tested in a NO2 atmosphere at various operating temperatures. The thermal spray coating method is useful for mass producing solid electrolytes without a forming, sintering or bonding process. In this study, the characteristics of the solid electrolyte made by thermal spray coating were examined and its potential application to a NO2 gas sensor was evaluated with mixed sensing materials. The 8YSZ solid electrolyte film exhibited a single phase of ZrO2 and had a constant conductivity in a wide range of oxygen partial pressures, even though the microstructure was rough-columnar type. In addition, it can be suggested that the lower ion conductivity and activation energy of the 8YSZ solid electrolyte film, which resulted from the rough microstructure, increased as much as that of the dense and smooth electrolyte layer prepared by the tape casting method. It produced a denser coating film after using finer granule powders. In particular, the NiO・YSZ mixed sensing material exhibited significantly improved response and recovery characteristics compared to pure NiO. This enhancement is attributed to the smaller NiO particles produced by the grain growth inhibitor YSZ, and the increased triple phase boundary between the sensing material, NO2 gas and solid electrolyte.
Keywords: NO2 Sensor, thermal spray coating, 8YSZ electrolyte, mixed potential type sensor, sensing material
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