As a conductive polymer, polyaniline (PANI) has been broadly utilized as an electrode material for highperformance SCs thanks to its large specific capacitance, [3,4] outstanding flexibility, [5][6][7] and environmental stability, let alone its easy synthesis. [8][9][10] Although PANI exhibits a satisfying performance in SCs, its relatively low electric and ionic conductivity resulting from agglomeration will lead to a sluggish redox reaction and thus a deteriorated capacitance under high current density. [11][12][13] This problem should weaken the practicality of PANI electrodes to a certain degree. According to the successful experience of other electrodes that have solved the similar problems, [14][15][16] it is preferable to combine the pseudocapacitive PANI with some conductive and porous materials, which can assist PANI to achieve its full potential via the synergistic effects. [10,[17][18][19] For instance, 2D materials (e.g., graphene) with large and adjustable surfaces could load a large number of PANI nanoparticles with good homogeneity via different means, guaranteeing a fast redox reaction and then a decent rate capability. [17,18,[20][21][22] As an important member of 2D materials, antimonene (Sb) nanosheets present not only a large surface area and high conductivity, [23,24] but also excellent mechanical strength and flexibility. [25,26] A preliminary researchIn virtue of the high electrochemical activity and inherent flexibility, polyaniline (PANI) is an ideal electrode material for flexible supercapacitors (SCs). However, in practical applications, the inevitable agglomeration of PANI leads to low capacitance, poor rate performance, and cycling stability. Here, antimonene (Sb) nanosheets with ultrathin thickness, excellent mechanical strength, and flexibility are introduced into the carbon nanotube (CNT) framework for PANI electrodeposition via simple vacuum filtration, which enables the continuous and uniform growth of PANI. The resultant free-standing Sb/CNT/PANI electrode can thus exhibit a high specific capacitance of 578.57 F g −1 together with a high rate capability. Besides, thanks to the introduction of Sb nanosheets, the agglomeration of PANI during the electrodeposition is improved, which correspondingly alleviates the structural deterioration of PANI during repeated charge/discharge. Thus, the flexible SC assembled by Sb/CNT/PANI electrodes demonstrates both an impressive specific capacitance of 416 F g −1 and outstanding cycling stability over 12 000 cycles. Moreover, this SC device can have a practical self-healing function by employing self-healable polyurethane. The facile strategy reported herein sheds light on the design of high-performance flexible SCs, catering to the needs of portable and wearable electronics.
All-inorganic perovskite nanocrystals (CsPbX3, X = Cl, Br, and I) have attracted increasing attention in various fields due to their unique optoelectronic properties. However, the vulnerable structure of CsPbX3 in aqueous solutions severely limits its further application in diverse fields. Although many protocols have been developed, the synthesis of all-inorganic CsPbX3 nanocrystals in a large-scale and environment-friendly manner remains a significant challenge. Here, we demonstrate a facile strategy for modifying CsPbX3 with a zeolitic imidazolate framework (ZIF-8) through mechanical milling, which can be used for the large-scale synthesis of CsPbX3@ZIF-8 composites. More importantly, the as-prepared composites display superior stability, and the photoluminescence (PL) intensity remains ∼86.7% after 8 weeks. Detailed characterizations indicate that the synergy in the composites can significantly facilitate the separation of photoinduced electrons and holes, leading to an increase in the photocurrent intensity. For photocatalytic H2 evolution under visible light, the optimal CsPbBr3@ZIF-8 composite exhibits a H2 productivity of 19.63 μmol·g–1 H2 after 2.5 h, thus proving to be a promising catalyst for photocatalytic H2 evolution under visible light in aqueous solutions. This work may not only provide a facile strategy for the modification of CsPbX3 nanocrystals but also promotes their practical applications in diverse fields.
The rapid development of portable and wearable electronics has promoted the integration of multifunction techniques. Although flexible energy storage systems have been successfully investigated, the compact configuration with photodetector and energy storage components has received less attention. As a new member of the 2D material class, MXene exhibits remarkable electronic and optical properties. Here, through the intentional introduction of ZIF-67 derivatives deposited on the Mo2CT x nanosheets, the synthesized Co-CoO x /NC/Mo2CT x heterostructure not only provided a straightforward pathway for photogenerated electrons to transport but also enhanced the structural stability of Mo2CT x , leading to a high responsivity and short rise/decay time under the illumination of simulated light in the photoelectrochemical (PEC) configuration. The integrated flexible device based on a zinc ion battery and Co-CoO x /NC/Mo2CT x heterostructure shows outstanding photodetection function and retains the intrinsic charge/discharge behaviors, which could monitor 1 day sunlight changes in real time. The paradigm presented here paves the way for realizing the development of miniaturization and multifunction toward next-generation portable and wearable technologies.
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