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[Display omitted] • A multifunctional e-textile based on PPy@KCSF and PPy/Ag@KCSF is constructed. • PPy/Ag@KCSF-based sensor effectively balances the operating range and sensitivity. • PPy@KCSF-based supercapacitor shows prominent energy density and power density. • The multifunctional e-textile exhibits broad prospects in wearable domain. Textile-based wearable devices have attracted much attention as they can improve the wearing comfort and safety of electronic products. This paper proposes a fabrication strategy for a multifunctional e-textile based on polypyrrole (PPy) and rose-like silver flower-decorated knitted cotton/spandex fabric (KCSF). The rose-like silver flower grown on the PPy surface by electrodeposition can further improve the surface roughness and pressure sensitivity of the fabric. PPy and rose-like silver flower-decorated KCSF can be used to construct a multi-layer pressure/strain sensor. The as-obtained sensor not only exhibits an ultra-wide working pressure range (0–900 kPa), but also achieves a high sensitivity (17.41 kPa−1 for low-pressure areas), which effectively balances the operating range and sensitivity. More importantly, the sensor can be used to accurately monitor different physiological signals, including the levels of swallowing, breathing rate, voice recognition, and sleep quality. In addition, an all-solid-state supercapacitor is fabricated using PPy-coated fabric electrodes, demonstrating a high areal capacitance of 978.9 mF cm−2 at 1 mA cm−2, an energy density of 80.3 µWh cm−2, and power density of 0.38 mW cm−2. The multifunctional e-textile with excellent sensing and energy storage behaviors is simple and easy to manufacture, with potential application prospects in the broad field of wearable technology. [ABSTRACT FROM AUTHOR]

The flexible MBC electrodes were prepared by HTC method: On the one hand, electrostatic self-assembly between the radish flakes with positive charge soaked in salt solution and MXene nanosheets with negative charge was applied. On the other hand, it is driven by the concentration difference permeation (CDP) principle between MXene nanosheets and radish cells. [Display omitted] • The 3D MBC carbon aerogel shared by the cathode and anode for asymmetric supercapacitor is proposed. • The MBC-6 exhibits a volumetric specific capacitance of 1801.4 mF/cm3. • The asymmetrical supercapacitor assembled exhibits an ultra-high volume energy density of 33.4 Wh/L. Despite the rapid development of biomass-based carbon aerogels research and specific outcomes have been accomplished, the preparation process requires to be developed further compared with other porous media such as activated carbon and graphene, and there are still many obstacles to overcome before reaching industrial production and practical applications since the competitiveness in terms of mechanical strength, adsorption capacity, and structural stability is weaker. Via using electro-static self-assembly between the negatively charged MXene nanosheets and the positively charged radish flakes infiltrated with salt solution, a strategy is proposed for the in-situ preparation of flexible MXene/biomass/chitosan aerogel (MBC) pseudo-capacitive electrode by hydrothermal methods. The electrode was drived according to the principle of concentration difference permeation (CDP) between MXene nanosheets and radish cells. Under both driving forces, the MXene nanosheets are embedded inside the radish cells. Importantly, the MBC pseudocapacitive electrode doping 6% (MBC-6) by lyophilization annealing exhibits a volumetric specific capacitance of 1801.4 mF/cm3 at a scan rate of 2 mV/s. In addition, the assembled binder-free asymmetrical supercapacitor exhibits an ultra-high volume energy density of 33.4 Wh/L, a capacitance retention rate of 82% and a long cycle life of 50,000 times at a high current density of 10 mA/cm3. A plausible approach for creating energy storage devices with a high energy density and voltage window is presented in this study. [ABSTRACT FROM AUTHOR]

• We demonstrate a facile route to fabricate a novel CoO–CoSe 2 @N-CNTs/rGO nanohybrid. • CoO–CoSe 2 @N-CNTs/rGO shows excellent electrocatalytic performance for OER. • CoO–CoSe 2 @N-CNTs/rGO outperforms commercial RuO 2 and most Co-based electrocatalysts. • The superb catalytic performance owes to rational composition and structure design. Constructing CoO–CoSe 2 heterostructures through partial selenization of CoO is proposed to ameliorate the electrocatalytic performance of Co-based compounds toward oxygen evolution reaction (OER). Moreover, with reduced graphene oxide as a platform to in-situ grow N-doped bamboo-like carbon nanotubes encapsulating part of CoO and CoSe 2 nanoparticles, we fabricated a novel hybrid (denoted as CoO–CoSe 2 @N-CNTs/rGO) via a combination of two-stage calcination and subsequent selenization treatment. As an OER electrocatalyst in 1.0 M KOH, CoO–CoSe 2 @N-CNTs/rGO affords low overpotentials (250 mV@10 mA cm−2 and 322 mV@100 mA cm−2), favorable kinetics (a Tafel slope of 68 mV dec−1), and excellent durability, outperforming commercial RuO 2 and most Co-based electrocatalysts reported till date. Comprehensive experiment results uncover that the exceptional electrocatalytic performance mainly emanates from the synergistic effect between CoSe 2 and CoO in heterostructure, N doping effect in CNT and rGO, and the confining effect of N-CNTs and rGO for CoO–CoSe 2 , resulting in more active sites and enhance conductivity. More importantly, density functional theory calculations disclose that the concurrent N doping and desirable encapsulation of the CoO–CoSe 2 nanoparticle in N-CNT can optimize the adsorption energies of OER intermediates and increase the electric conductivity, thereby expediting the OER. This work is helpful to foster understanding on the structure–performance correlations of electrocatalysts with multi-active sites and multi-components for diverse applications. [ABSTRACT FROM AUTHOR]