2D MXene materials based flexible miniaturized energy storage devices, such as the battery, [4,5] microsupercapacitors (MSCs), [6,7] hybrid metal-ion MSC, [8,9] are being extensively explored owing to their outstanding electrical conductivity, excellent mechanical stability, and versatile chemistry. [10] Considering MXene-based flexible miniaturized MSCs catering to integrated wearable electronics, the strong security, long cycling, and high energy density should be satisfied simultaneously. The emergence of hybrid multivalent metal cations Zn 2+ MSC using MXene cathodes fits well to the required conditions due to the co-contribution of both capacitive-type ion adsorption or fast surface redox reactions and diffusioncontrolled Faradic reactions originating from SCs and battery, respectively. [11] Moreover, the low cost, abundant sources, high safety, and eco-friendly features of Zn as compared to other alkaline metal ions like Li + , Na + , K + , Ca 2+ , and Mg 2+ enable the hybrid Zn-ion MSCs to be widely investigated. [12] Intercalation and delamination are necessary processes to obtain 2D MXene materials, [13] in which the MXene' interlayers will accommodate various ions and small organic molecules, resulting in adjustable interlayer spacing and unique properties. [14] The interlayer space usually affects the metal ion shuttles, larger space between MXene layers leads to the fast and easy diffusion of metal ions and helps achieve advanced electrochemical performance, which is particularly evident in metal ions with large radius. [15] Zn ion falls right into the alkaline metal ions with a large radius, almost twice as extensive as that of Li + (0.76 Å). Therefore, the high-performance MXene cathode-based Zn-ion MSC depends primarily on the appropriate selection of intercalators for MXene. In addition, the suitable intercalations could improve the high dispersion of MXene materials, which benefits the fabrication of MSC devices and reduce the resistance of the assembled Zn-ion MSC.Aimed at finding appropriate intercalators to achieve high-performance MXene cathodes based Zn-ion MSC, we delaminated 2D Ti 3 C 2 T x MXene using N,N-dimethylacetamide (DMAC) containing amide group, acetonitrile (ACN) containing cyanide group, Dimethyl sulfoxide (DMSO) containing sulfinyl group, N,N-dimethylformamide (DMF) containing The delamination of 2D Ti 3 C 2 T x MXene endows the injection of various ions and small organic molecules into its layers, thus leading to a tunable distance between layers and adjustable electrochemical properties. A suitable selection of intercalators needs to be considered according to the relevant metal-ionbased energy storage device because of the different radii of metal ions such as Li + , Na + , Mg 2+ Zn 2+ , etc. Herein, the intercalation of N,N-dimethylacetamide (DMAC), acetonitrile (ACN), dimethyl sulfoxide (DMSO), LiCl (H 2 O) into Ti 3 C 2 T x cathodes and their electrochemical performance comparisons by fabricating Zn-ion microsupercapacitors (MSCs) is reported. Studies found that an increa...

Fabrication of miniature‐integrated devices combining energy harvester, energy storage, and various sensors via simple, fast, and efficient ways is strongly desired for the practical application of integrated smart systems. Here, this work presents a simple one‐step laser scribing method to prepare an all MXene‐based seamlessly integrated system with integrated wireless charging coil, micro‐supercapacitor, and photodetector in a small area of only 1.78 cm2. All the three modules in the integrated system are composed entirely of Ti3C2Tx MXene and are connected with highly conductive MXene wires without additional welding or assembling operation. The energy is first received by the wireless charging coil and then stored in the Zn‐ion micro‐supercapacitor, which is subsequently used to drive the surface‐modified (dodecyl triethoxysilane) DCTES‐MXene‐based photodetector, thus realizing the complete energy cycles. This work conceptually illustrates a simple method for designing and preparing integrated multifunctional wearable devices.

Weak-light detection technology is widely used in various fields, including industry, high-energy physics, precision analysis, and reflection imaging. Metal−semiconductor−metal (MSM) photodetectors demonstrate high detectivity and high response speed and are one of the suitable structures for the preparation of weak-light detectors. However, traditional MSM photodetectors tend to exhibit high dark currents, which are not conducive to performance improvement. Here, a MXene− Cs 3 Bi 2 I 9 −MXene weak-light detector is proposed. Based on the MXene−Cs 3 Bi 2 I 9 Schottky junctions, the dark current is reduced by 2 orders of magnitude and the responsivity is significantly improved compared with the traditional Cr/Au−Cs 3 Bi 2 I 9 −Cr/Au MSM photodetector. The device demonstrates excellent photodetection capacity with a photoresponsivity of 6.45 A W −1 , a specific detectivity of 9.45 × 10 11 Jones, and a fast response speed of 0.27/2.32 ms. Especially, the device yielded a superior weak-light detectable limit of 10.66 nW cm −2 and demonstrated excellent optical communication capability. Moreover, such a flexible device shows little degradation in photodetection performance after extreme bending for 4500 cycles, proving remarkable bending endurance and flexibility. The obtained results highlight the great potential of such Cs 3 Bi 2 I 9 /MXene devices as a stable and environmentally friendly candidate for weak-light detection. KEYWORDS: Cs 3 Bi 2 I 9 microplates, Ti 3 C 2 T x MXene, flexible, weak-light detection, stability

Although much effort has been devoted to improving the electrochemical performances of MXene-based metal-ion hybrid microsupercapacitors (MSCs), few works focus on the electrolyte. Therefore, we proposed K4Fe(CN)6 as the redox additive to alter the properties of the Zn(CF3SO3)2 gel electrolyte used in Ti3C2T x -DMAC MXene-based interdigital Zn-ion hybrid MSCs. The electron transfers between Fe2+ and Fe3+ in K4Fe(CN)6 can provide an additional Faraday pseudocapacitance, resulting in the high volumetric capacitance (2107.4 F cm–3 at a scan rate of 5 mV s–1) of the MSCs and excellent cycling stability with 88.64% of the original capacity retention after 5000 cycles of charge and discharge. Such a superior performance of MSCs can provide a potential of 0.9 V for the integrated Ti3C2T x -DCTES MXene-based photodetector, which endows the detector with a stable response to 808 nm wavelength laser, providing a strong support for flexible self-powered integrated sensing systems.