锐钛矿型(101)晶面吸附SF<sub>6</sub>局部放电分解组分的气敏机理分析

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摘要气体绝缘组合开关(GIS)内部的局部放电会导致绝缘气体SF₆分解,生成多种特征气体。通过检测特征气体的成分和浓度能够及早发现GIS设备内部潜伏性绝缘缺陷,在设备绝缘状况恶化前提前预警,避免突发性故障发生。作为气敏传感领域的研究热点,TiO₂纳米管在GIS故障气体监测领域应用前景广阔。该文从微观层面上研究TiO₂纳米管气体传感器的气敏机理。利用Materials Studio软件仿真计算了锐钛矿型TiO₂(101)晶面的完美晶面、缺陷晶面以及Pt掺杂晶面对特征气体SO₂、SOF₂、SO₂F₂的吸附参数,理论分析了气体分子与晶面的作用过程,建立起晶面导电性能与气体分子吸附的联系。此外,通过气敏实验研究了本征及Pt掺杂TiO₂纳米管传感器对SO₂、SOF₂、SO₂F₂的气敏响应,并基于仿真结果解释实验现象,完善了TiO₂纳米管的气敏机理,为制备GIS设备局部放电监测的气敏传感器奠定了基础。

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关键词 ： TiO₂纳米管, SF₆分解组分, 锐钛矿(101)晶面, 气敏机理

Abstract：Partial discharge in gas-insulated switchgears (GIS) would lead to decomposition of insulating gas SF₆, with several kinds of characteristic gases produced. By detecting species and concentrations of these gases, insulating defects in gas-insulated switchgears can be discovered in time, which is essential in avoiding sudden faults of power system. TiO₂ nanotubes gas sensors as possess wide prospect in online monitoring of gas-insulated switchgears has broad application prospects. This paper focuses on the gas-sensing mechanism of TiO₂ nanotubes to SF₆ decomposed components from micro level. Materials Studio was adopted to conduct simulation of SO₂, SOF₂, and SO₂F₂ adsorption on anatase (101) with perfect surface, defect surface and Pt-doped surface. As a result, interaction of gas adsorption and conductive performance of anatase (101) surface were analyzed. Furthermore, gas-sensing experiment was also conducted to research the gas sensitive response of Pt doped and TiO₂ nanotube sensor to SO₂, SOF₂, and SO₂F₂, of which the results consisted with simulation analysis. Both simulation and experiment provide theoretical and practical basis on detection of SF₆ decomposition using TiO₂ nanotube gas sensors.

Key words： TiO₂ nanotube SF₆ decomposed components anatase (101) surface gas sensing mechanism

收稿日期: 2015-12-08 出版日期: 2017-02-27

PACS:

TM85

基金资助:国家自然科学基金项目资助(51277188)。

通讯作者: 张晓星男,1972年生,教授,博士生导师,研究方向为电气设备绝缘在线监测和故障诊断、绝缘状态评估、新型传感器技术。E-mail:xiaoxing.zhang@outlook.com(通信作者)

作者简介: 董星辰男,1991年生,硕士研究生,研究方向为电气设备绝缘在线监测和故障诊断、新型传感器技术。E-mail:DXC_ CQU@outlook.com

引用本文:

张晓星, 董星辰, 陈秦川. 锐钛矿型(101)晶面吸附SF₆局部放电分解组分的气敏机理分析[J]. 电工技术学报, 2017, 32(3): 200-209. Zhang Xiaoxing, Dong Xingchen, Chen Qinchuan. Gas Sensing Mechanism Analysis of SF₆ Decomposed Gases Adsorption on Anatase (101) Surface Under Partial Discharge. Transactions of China Electrotechnical Society, 2017, 32(3): 200-209.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I3/200

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