Teng-Teng Zhao, Wei-Wei Meng, Yue-Hua Li, Ming-Yong Wang, Ling Wang, Zhang-Xing He, Lei Dai
{"title":"构建吸附位增强ZnWO4/Li6W2O9异质结传感电极，提高阻抗型二氧化氮传感器的性能","authors":"Teng-Teng Zhao, Wei-Wei Meng, Yue-Hua Li, Ming-Yong Wang, Ling Wang, Zhang-Xing He, Lei Dai","doi":"10.1007/s12598-025-03296-w","DOIUrl":null,"url":null,"abstract":"<div><p>The application of NO<sub>2</sub> sensor reduces the emission of NO<sub>2</sub> from the industry and automotive vehicles. However, insufficient electrocatalytic activity and adsorption to NO<sub>2</sub> of sensing electrode (SE) limit the sensitivity increment of NO<sub>2</sub> sensor. Thus, a novel ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> heterojunction SE is constructed by molten salt method for the zirconia-based impedancemetric NO<sub>2</sub> sensor. The influence of the ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> ratio on the performance of the sensor is investigated. The results show that Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> in-situ formation on the surface of the ZnWO<sub>4</sub> in LiNO<sub>3</sub> molten at a low temperature of 300 °C. The incorporation of Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> enhances both the adsorption property and electrocatalytic activity of the SE, simultaneously, resulting in a significant increase in the sensitivity of sensor. The sensitivity increases gradually with the increasing incorporation of Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub>. The sensitivity of ZnWO<sub>4</sub>/37.5% Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> sensor is significantly increased by 124% compared to the pristine ZnWO<sub>4</sub> sensor and exhibits the largest sensitivity of 25.19 (°) decade<sup>−1</sup> at 400 °C. Moreover, the ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> sensor also displays excellent selectivity, long-term stability, and repeatability. The introduction of in-situ formation by molten salt method is an effective strategy to develop gas sensors with large sensitivity.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 8","pages":"5594 - 5606"},"PeriodicalIF":11.0000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Constructing adsorption site-enhanced ZnWO4/Li6W2O9 heterojunction sensing electrode for efficient performance in impedancemetric NO2 sensor\",\"authors\":\"Teng-Teng Zhao, Wei-Wei Meng, Yue-Hua Li, Ming-Yong Wang, Ling Wang, Zhang-Xing He, Lei Dai\",\"doi\":\"10.1007/s12598-025-03296-w\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The application of NO<sub>2</sub> sensor reduces the emission of NO<sub>2</sub> from the industry and automotive vehicles. However, insufficient electrocatalytic activity and adsorption to NO<sub>2</sub> of sensing electrode (SE) limit the sensitivity increment of NO<sub>2</sub> sensor. Thus, a novel ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> heterojunction SE is constructed by molten salt method for the zirconia-based impedancemetric NO<sub>2</sub> sensor. The influence of the ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> ratio on the performance of the sensor is investigated. The results show that Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> in-situ formation on the surface of the ZnWO<sub>4</sub> in LiNO<sub>3</sub> molten at a low temperature of 300 °C. The incorporation of Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> enhances both the adsorption property and electrocatalytic activity of the SE, simultaneously, resulting in a significant increase in the sensitivity of sensor. The sensitivity increases gradually with the increasing incorporation of Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub>. The sensitivity of ZnWO<sub>4</sub>/37.5% Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> sensor is significantly increased by 124% compared to the pristine ZnWO<sub>4</sub> sensor and exhibits the largest sensitivity of 25.19 (°) decade<sup>−1</sup> at 400 °C. Moreover, the ZnWO<sub>4</sub>/Li<sub>6</sub>W<sub>2</sub>O<sub>9</sub> sensor also displays excellent selectivity, long-term stability, and repeatability. 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Constructing adsorption site-enhanced ZnWO4/Li6W2O9 heterojunction sensing electrode for efficient performance in impedancemetric NO2 sensor
The application of NO2 sensor reduces the emission of NO2 from the industry and automotive vehicles. However, insufficient electrocatalytic activity and adsorption to NO2 of sensing electrode (SE) limit the sensitivity increment of NO2 sensor. Thus, a novel ZnWO4/Li6W2O9 heterojunction SE is constructed by molten salt method for the zirconia-based impedancemetric NO2 sensor. The influence of the ZnWO4/Li6W2O9 ratio on the performance of the sensor is investigated. The results show that Li6W2O9 in-situ formation on the surface of the ZnWO4 in LiNO3 molten at a low temperature of 300 °C. The incorporation of Li6W2O9 enhances both the adsorption property and electrocatalytic activity of the SE, simultaneously, resulting in a significant increase in the sensitivity of sensor. The sensitivity increases gradually with the increasing incorporation of Li6W2O9. The sensitivity of ZnWO4/37.5% Li6W2O9 sensor is significantly increased by 124% compared to the pristine ZnWO4 sensor and exhibits the largest sensitivity of 25.19 (°) decade−1 at 400 °C. Moreover, the ZnWO4/Li6W2O9 sensor also displays excellent selectivity, long-term stability, and repeatability. The introduction of in-situ formation by molten salt method is an effective strategy to develop gas sensors with large sensitivity.
期刊介绍：
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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