AEM: Femtosecond Laser Etching of MXene Micro Supercapacitors

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North Konami can provide MXene (can be customized)

  With the advent of the Internet of Things, miniaturized wearable electronics with excellent flexibility and microscopic energy storage have received extensive attention. Compared with microbatteries, micro-supercapacitors (MSCs) have higher power density and longer cycle life, so they have great advantages in practical applications, such as micro-electromechanical systems, micro-nano robots, and micro-actuators. In order to obtain MSCs with high energy and power density, many nanomaterials are used to prepare MSCs.

      Laser technology has the advantages of flexible processing and precise imaging, and does not require any templates or masks, and can realize one-step assembly of MSCs integrated electrodes. Prof. Gogotsis group reported a method to fabricate MXene MSCs by subtle laser etching. The ultrashort pulse duration of the femtosecond laser enables the spacing of MoS2MSCs as low as 833 nm. However, the preparation of MSCs by femtosecond laser technology is still in its infancy.

Recently, Prof. Lijun Yang, Prof. Hai-Tao Fang of Harbin Institute of Technology and Prof. Xiaohui Wang of Institute of Metal Research, Chinese Academy of Sciences published the title in the internationally renowned academic journal Advanced Energy Materials: Femtosecond Laser-Etched MXene Microsupercapacitors with Double-Side Configuration via Arbitrary On- and Through-Substrate Connections research paper achieves high-precision double-sided assembly by using femtosecond laser pulses to simultaneously etch both sides of a transparent polyethylene terephthalate substrate. MXene-based double-sided MSCs were fabricated by connecting 12 helical MSC units in series with differential electrodes with a spacing of 10 μm, which can output a high working voltage of 7.2 V.

Figure 1. Preparation and characterization of MXene electrodes on one side of a PET substrate.

Figure 2. Raman images of specific locations in SEM.

Figure 3. Electrochemical performance of a single MXene MSC unit.

Figure 4. Mechanical stability of MSC-10 μm.

Figure 5. Assembly and images of double-sided MXene MSCs on PET substrates.

Figure 6. Electrochemical performance of double-sided MXene MSCs with different attachment methods.

Overall, the as-prepared MXenes bifacial MSCs exhibit outstanding integration, arbitrary shape, and outstanding flexibility, achieved by simultaneous sub-second laser etching on both sides of a transparent PET substrate. Compared with existing mature technologies, this approach can enhance the level of integration of MSCs, from one-sided to two-sided use on substrates, facilitating the further development of miniaturized wearable electronics.

Literature link:

https://doi.org/10.1002/aenm.202000470.