Flexible supercapacitors (SCs) have the advantages of high flexibility, high mechanical strength, easy assembly, and high power density, so SCs can be widely used in portable and wearable electronic devices. It is of great significance to research and develop high-performance electrode materials in order to further improve the performance of SCs and expand their application fields. Here, we prepared a free-standing flexible g-C 3 N 4 /Ti 3 C 2 hybrid film as electrode material for SCs by inserting two-dimensional g-C 3 N 4 nanosheets between Ti 3 C 2 layers-based vacuum suction filtration methods. The addition of g-C 3 N 4 nanosheets effectively prevented the self-stacking of MXene layers, significantly increasing the interlayer spacing of g-C 3 N 4 /Ti 3 C 2 hybrid film. The electrochemical results show that the mass specific capacity of 10 wt% g-C 3 N 4 / Ti 3 C 2 is as high as 552 F g À1 at the scanning rate of 2 mV s À1 , which is 3.29 times higher than 168 F g À1 of Ti 3 C 2 , the capacity retention rate of 10 wt% g-C 3 N 4 /Ti 3 C 2 is 97% after 10 4 cycles at a current density of 3 A g À1 .

GIS’s reducing unit is a new and environment-friendly structural unit, which can greatly reduce the consumption of aluminum alloy material and insulating gas. The structural size of this unit is much smaller than the conventional one. In this paper, an acoustic-structure coupling interaction model of partial discharge in reducing unit of gas insulated switchgear (GIS) is presented. The interaction between the internal acoustic source of partial discharge and structure of GIS is simulated with the finite element analysis, and the acoustic pressure levels distribution of GIS is obtained. The results show that the sound pressure distribution of the reducing unit is basically the same as that of the conventional one, but the amplitude is larger. At the same time, the high-frequency part of the acoustic signal attenuates more quickly in the reducing unit. This paper provides a theoretical guidance basis for the ultrasonic partial discharge detection of the GIS reducing unit.

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