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The actual manufacture of supercapacitors (SCs) is restricted by the inadequate energy density, and the energy density of devices can be properly promoted by assembling zinc-ion capacitors (ZICs) which used capacitive cathode and battery-type anode. Two-dimensional (2D) MXene has brought great focuses in the electrode research on the foundation of large redox-active surface, but the specific capacitance is still affected by the tight stacking of interlaminations. Ti3C2Tx@polyaniline (PANI) heterostructures are prepared by uniformly depositing the conductive polymer PANI nanorods as the intercalation agent into the external of Ti3C2Tx nanosheets to inhibit stacking. Subsequently, by using graphene oxide (GO)-assisted low-temperature hydrothermal self-assembly manufacture, 2D heterostructures are assembled into the three-dimensional (3D) porous crosslinked Ti3C2Tx@PANI-reduced graphene oxide (RGO) hydrogels. Attributed to the synergistic work of PANI nanorods, Ti3C2TX nanosheets, and 3D crosslinking frameworks of RGO to match capacitive and battery effects, 3D porous hierarchical Ti3C2Tx@PANI-RGO heterostructure hydrogels have rich ion transport channels, a large number of active sites, and excellent reaction kinetics. ZIC is assembled by using Ti3C2Tx@PANI-RGO heterostructure hydrogels as cathodes and zinc foil as anodes. In this work, Ti3C2Tx@PANI-RGO//Zn ZIC exhibits a wide working window (2.0 V), marked specific capacitance (589.89 F·g−1 at 0.5 A·g−1), salient energy density (327.71 Wh·kg−1 at 513.61 W·kg−1 and 192.20 Wh·kg−1 at 13,005.87 W·kg−1), and durable cycling stability (97.87% capacitance retention after 10,000 cycles at 10 A·g−1). This study emphasizes the device design of ZICs and the broad prospect of Ti3C2Tx-based hydrogels as viable cathodes for ZICs. [ABSTRACT FROM AUTHOR]

Multifunctional intelligent fabric plays an integral role in health management, human–machine interaction, wireless energy storage and conversion, and many other artificial intelligence fields. Herein, we demonstrate a newly developed MXene/polyaniline (PANI) multifunctional fabric integrated with strain sensing, electrochemical energy storage, and electromagnetic shielding properties. The multifunctional fabric-based strain sensor possesses a real-time signal response at a sizeable tensile strain of 100% with a minute strain of 0.5%, maintaining a stable and consistent signal response even after 3000 stretch–release cycles. In addition, the multifunctional fabric exhibits excellent electromagnetic shielding capabilities, achieving a total shielding effectiveness value of up to 43 dB, and in the meantime shows attractive electrochemical energy storage performance as an electrode in a supercapacitor, offering a maximum specific capacity and energy density of 522.5 mF·cm−2 and 18.16 µWh·cm−2, respectively. Such a multifunctional intelligent fabric offers versatile opportunities to develop smart clothes for various artificial intelligent applications. [ABSTRACT FROM AUTHOR]

Electrochemically converting CO2 to value-added multi-carbon (C2+) fuels and chemicals is a favorable way to achieve carbon neutrality. Herein, polyaniline/CuO nanosheets (PANI/CuO NSs) hybrid electrocatalysts are developed in order to achieve superior C2+ selectivity by imparting PANI functional component to the CuO NSs. The decorated PANI nanoparticles (NPs) can effectively stabilize the *CO intermediates and increase their coverage on the active Cu sites, which facilitates the C–C coupling to form multi-carbon products. Benefiting from the synergetic effect of PANI and CuO NSs, best Faradaic efficiency (FE) for C2+ product up to 66.4% at −1.6 V vs. reversible hydrogen electrode (RHE) in a H-cell measurement and 60.0% at 400 mA·cm−2 in a flow cell measurement are demonstrated by PANI/CuO NSs-25 sample. More importantly, the C2+ selectivity keeps stable even in a continuous measurement time period of 92 h in H-cell measurement. The present study may provide more insights for designing efficient hybrid materials toward superior C2+ production from electrocatalytic CO2 reduction. [ABSTRACT FROM AUTHOR]