Environmentally friendly super-insulating material with three-dimensional nanoporous structure: A promising candidate for future gas insulated transmission lines and carbon sequestration
Environmentally friendly super-insulating material with three-dimensional nanoporous structure: A promising candidate for future gas insulated transmission lines and carbon sequestration
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DOI：
10.1016/j.cej.2023.147673
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发表时间：
2023-11
影响因子：
15.1
通讯作者：
W. Sima;Xiaoxiao Chen;P. Sun;T. Yuan;Ming Yang;Yongqing Chen;Wenlong Pang;Zhaoping Li
中科院分区：
文献类型：
--
作者：
W. Sima;Xiaoxiao Chen;P. Sun;T. Yuan;Ming Yang;Yongqing Chen;Wenlong Pang;Zhaoping Li
气体绝缘输电线路（GIL）在促进可再生能源发电的未来长距离传输方面发挥着关键作用。然而，由于SF6气体击穿强度较低，且具有明显的温室效应，SF6气体的广泛应用给GIL的规模化应用带来了巨大的障碍。本工作发现了纳米结构对绝缘气体击穿场强有显著增强作用的奇异现象，并以此为基础设计并制备了具有三维纳米孔结构的淀粉/聚有机硅氧烷生物复合绝缘介质（S/PBID）。具体地说，绝缘气体（CO2，N2，SF6）与S/PBID复合，击穿场强显着提高了744.44%，520.74%，310.95%，分别比原来的气体。S/PBID（<2）的相对介电常数比大多数现有绝缘材料的相对介电常数低得多。理论分析表明，S/PBID内的纳米孔限制在横向尺度上的电子倍增和传输过程，导致气体击穿场强的大幅增强。该纳米多孔材料有望与大气CO2复合，颠覆传统气固复合绝热形式的GIL，从而提供一种高性能、环保、固碳的新型绝热形式。
Gas-insulated transmission lines (GILs) play a pivotal role in facilitating the future long-distance transmission of power generated by renewable energy. However, the extensive employment of gaseous SF6presents formidable obstacles to scaled application of GILs, due to its relatively low breakdown strength and substantial greenhouse effect. In this work, a fantastic phenomenon was discovered that the breakdown field strength of insulating gases can be significantly enhanced under the confinement of nanostructures, based on it, the starch/polyorganosiloxane biocomposite insulating dielectric (S/PBID) with three-dimensional nanoporous structure was designed and fabricated. Specifically, insulating gases (CO2, N2, SF6) composite with S/PBID, the breakdown field strength is significantly improved by 744.44 %, 520.74 %, and 310.95 % compared to the original gases, respectively. The relative permittivity of S/PBID (<2) is considerably lower than that of most existing insulating materials. Theoretical analysis suggests that the nanopores within S/PBID restricts electron multiplication and transport processes at the lateral scale, leading to a substantial enhancement in gas breakdown field strength. The nanoporous material is expected to be composited with atmospheric CO2to overturn the conventional gas–solid composite insulation form of the GILs, thereby providing a novel insulation form of high-performance, environmental-friendly, and carbon sequestration.