乙炔
材料科学
溶解气体分析
变压器
静电纺丝
异质结
变压器油
纳米纤维
分析化学(期刊)
化学工程
光电子学
纳米技术
复合材料
化学
电气工程
聚合物
色谱法
有机化学
电压
工程类
作者
Mi-Hee Jung,Minjun Kwak,Jung Hwan Ahn,Ji‐Yoon Song,Hohyung Kang,Hee‐Tae Jung
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2024-01-02
卷期号:9 (1): 217-227
被引量:1
标识
DOI:10.1021/acssensors.3c01844
摘要
Acetylene (C2H2) is a gas that can cause explosions in transformers even at low concentrations. Gas chromatography (GC) or photoacoustic spectroscopy (PAS) have been used to detect C2H2 during dissolved gas analysis (DGA), but they are not suitable for monitoring numerous transformers at substations. Even though metal oxide semiconductor (MOS) based C2H2 sensors have drawn much attention as a potential solution, existing MOS-based C2H2 sensors have low sensitivity toward C2H2 in the transformer environment (<2% O2 concentrations). This study develops high-performance C2H2 gas sensors for DGA using a heterostructure of CuO/ZnO (CZ) via the electrospinning process. Performance of various ratios of CZ composite nanofibers are compared in a transformer-like environment, and the optimal composition of CZ nanofibers for detection of C2H2 at 2% O2 concentration is proposed. The CuO:ZnO = 8:2 (CZ2) sensor achieves the highest response (Rg/Ra = 7.6 against 10 ppm of C2H2) toward low concentration of C2H2 at 200 °C with good stability (>10 h). In addition, the CZ2 sensor also shows a high selectivity (>5 times) to coexisting transformer oil gases which are H2, CH4, C2H4, C2H6, CO, and CO2. Overall, this study is the first to demonstrate a high performing DGA sensor under 2% O2 concentration that can provide a practical solution to monitoring the low concentration of C2H2 in transformers effectively.
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