If both sides of the substrate are used to build micro-supercapacitors (MSCs) , the capacity of MSCs can be doubled. However, since it is difficult to accurately locate each MSC pair on both sides with two identical MSC units, it is a huge challenge to realize the electrical connection of the MSC with the substrate .

Achievements

Recently, the Harbin Institute of Technology ‘s Professor Fang Haitao and Lijun Yang professor of Chinese Academy of Sciences and the metal of Wang Xiaohui, a researcher at the top international journal Advanced Energy Materials published entitled " (111) Surfaces Laser-Etched Microsupercapacitors with Double-Side On-Q® and the Configuration Via MXene Arbitrary Through-Substrate Connections " paper. In this work, a transparent polyethylene terephthalate substrate was etched synchronously by femtosecond laser pulses to obtain a double-sided structure formed by high-precision serialized back-to-back MSC pairs and randomly connected through the MXene MSC cell substrate Realized a variety of double-sided MSC ( DS MSC ) . MXene DS MSC prepared by connecting 12 spiral MXene MSC units in series can output up to 7.2 VWorking voltage. In addition, femtosecond laser etching resulted in the formation of titanium dioxide at the edge of MXene . However, the small area affected by the laser has almost no effect on the performance of the capacitor, which is one of the advantages of the femtosecond laser over the traditional laser. This study has important reference value for the one-step preparation of highly integrated MSCs in miniaturized energy storage systems .

Figure  1  Schematic diagram of the preparation process.

Figure  2  Schematic diagram of laser etching area.

Figure  3  Electrochemical performance of MXene MSC .

Figure  4  Mechanical properties of MSC-10 .

Figure  5  Schematic diagram of preparation of MXene DSMSCs .

Figure  6  Electrochemical performance of MXene DSMSCs .

in conclusion

In summary, highly integrated MXene DSMSCs with arbitrary shapes and outstanding flexibility were prepared by the simultaneous etching of both sides of the transparent substrate by femtosecond laser . The output voltage and capacitance of the prepared MXene DSMSCs have good adjustability. During the femtosecond laser etching, the edge area of the electrode affected by the laser is less than 1μm , which has little effect on the capacitance performance of MSCs . Series MXene MSC preparation unit MXene DSMSCs may output up to 7.2 V operating voltage. This work will further contribute to the development of miniaturization of portable electronic products.

Original link:

https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202000470

Source: MXene Academic