MXene @ 普鲁士 蓝 Analogs Heterogeneous structure flexible energy storage

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【Research Background】

   In recent years, the heterostructure has the ability to create collaborative advanced materials, combined with the common advantages of various components and eliminated their shortcomings, so it has attracted the interest of many researchers in the field of energy storage, electronics, optoelectronics and catalysis. Since 2004 , the synthesis of graphene has spawned a new era of integrating graphene into heterostructures, which can be further assembled directly into flexible and conductive membrane electrodes. These flexible electrodes do not require binders, current collectors, and conductive additives, and show broad prospects in future flexible electronic applications. However, graphene‘s weak electrochemical redox activity limits their charge storage ability. Therefore, the current challenge is to find a qualified graphene alternative, which not only has the characteristics of graphene, such as high conductivity, excellent flexibility, easy preparation and large lateral size, but also has a very large High electrochemical activity, and MXene is an excellent graphene replacement material.

【Achievement Introduction】

   Recently, a team of professors Zhu Caizhen from the Institute of Low-Dimensional Materials Genetic Engineering of Shenzhen University published a research paper in the internationally renowned academic journal Chemical Engineering Journal , titled Mixed analogous heterostructure based on MXene and prussian blue analog derivative for high-performance flexible energy storage . The article reports the synthesis of a high-performance flexible heterostructure based on MXene and Prussian blue derivatives.

【Graphic introduction】

Figure 1. Heterostructure synthesis process and display of MXene and Prussian blue derivatives.

Figure 2. a, b) Ti3C2TxMXene scan and projection. C) Ni-Fe Prussian blue derivative nanocube . D) Ni-Fe oxide . E) MXene and Ni-Fe oxide composite heterojunction transmission diagram. F ) Is a cross-sectional scan of the composite heterojunction. Gk) element distribution.

Figure 3. Physical characterization of MXene and Ni-Fe oxide composite heterojunction. a) XRD bf) XPS

Figure 4. Performance test of MXene and Ni-Fe oxide composite heterojunction capacitors.

FIG five . Based MXene and Ni-Fe analysis heterojunction composite performance of the oxide capacitance.

Figure 6. MXene and Ni-Fe oxide composite heterojunction assembled into a device performance test .

【Summary of this article】

   In summary, a 2D-3D AHS- based composite paper electrode with high flexibility and excellent electrochemical performance was reported in this work . The optimized composite membrane has excellent energy storage performance, specific capacitance of 1038.43 mF cm ^-2 , and good flexibility. When assembled into an all-solid flexible supercapacitor, the resulting device achieved an excellent specific capacitance of 328.35 mF cm ^-2 under the condition of 0.2 mA cm ^-2 . In addition, it showed excellent cycle stability. The capacitance retention rate after 10,000 cycles was 90.9 %, and it still maintained a high mechanical stability of 88.9 % after a 50 -cycle bending test at 90 ° . In addition, supercapacitors can be assembled into series or parallel components, thus having a multiplied operating voltage window or a larger capacitance, thus proving the wide application potential in flexible devices.

Literature link

https: // doi.org/10.1016/j.cej.2019.123170.

Source: MXene Frontier