Competitive adsorption of gases dissolved in transformer oil on Co-doped ZnO (0 0 0 1) surface

Xiao, Guoqing; Chen, Weigen; Peng, Shoujian; Chen, Yu; Jiang, Zikai

doi:10.1016/j.commatsci.2017.10.004

Cited by 14 publications

(4 citation statements)

References 43 publications

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“…In this context, there are some combined theoretical and experimental studies on doped ZnO-based CO sensors [ 100 , 101 ]. Thereby, there are two ways to conduct combined theoretical and experimental studies on doped ZnO-based CO sensors.…”

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

“…These are subsequently validated by experimental techniques. In this direction, a combined theoretical–experimental study was conducted to investigate the Co-doped ZnO (0001) surface for CO sensing [ 100 ]. First, CO adsorption on the Co-doped ZnO (0001) surface was investigated using the PBE functional ( Figure 8 ).…”

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

“…These properties favor electron exchange between the gas and the sensor surface. Likewise, experimental findings demonstrated that the Co-doped ZnO is a good sensor for detecting CO gas [ 100 ].…”

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

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Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

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Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

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Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

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“…The power transformer is the electrical equipment used to transform alternating current (AC) voltage and current and transmit AC energy. , The safe and stable operation of a power transformer plays a significant role in modern power systems . Generally, insulating oil makes up the internal insulation system of a transformer; their state affects the service life of the transformer directly. − In the long term operation, a transformer will be affected by various stresses such as electrical stress, thermal stress, and mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Mechanisms of Dissolved Gases in Transformer Oil Influenced with Moisture Based on Molecular Dynamics Simulation

Jiang

Yang

et al. 2022

ACS Omega

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Dissolved Gas Analysis (DGA) of insulating oil is widely used for diagnosing transformer incipient faults. Moisture is a major contaminant and degradation byproduct of transformer insulating oil. In this paper, molecular dynamics simulation was used to study the influence of moisture on the diffusion movement of dissolved gases in the insulating oil. Cycloalkanes (C20H42), alkanes (C20H38), and aromatic hydrocarbons (C20H26) are selected as the basic structural units in the constructed transformer oil simulation system. 0%, 1%, 3%, and 5% moisture molecules are added to insulating oil, respectively, and the insulating oil generates seven kinds of gas molecules through cracking. With an anhydrous model used as a benchmark, we researched the diffusion trajectory, the diffusion coefficient (D), free volume (V F), and the moisture–gas interaction energy of each gas molecule as a function of moisture content. Through this study, we found that the increase of moisture content enlarges the V F value of dissolved gas in insulating oil, which makes the gas in oil easier to diffuse. Besides, the moisture can also alter the mean square displacement (MSD) of dissolved gases; the mutual energy of molecules is mainly affected by the electrostatic interaction energy. This study can contribute to a better understanding of the influence of different moisture contents on the diffusion movement of dissolved gas in transformer oil from the micro level.

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