In this study, the three-dimensional (3D) flowerlike porous Fe 3 O 4 microcrystals were prepared by a self-assembly approach with the assistance of ethylene glycol (EG). The generation mechanism of the 3D flowerlike Fe 3 O 4 microcrystals was revealed through controlling the parameters of the hydrothermal reaction time, the molar mass of the urea, and the calcination temperature. The proposed 3D flowerlike Fe 3 O 4 microcrystals exhibited superparamagnetic behaviors with high saturation magnetization (i.e., up to 73.1 emu• g −1 ) at room temperature. The Fe 3 O 4 −Au magnetic composites (MCs) were further prepared by a seed deposition process, and surface features were revealed by TEM, XRD, XPS, UV−vis, and SQUID techniques. Compared with the Fe 3 O 4 microcrystals themselves, the Au (∼20 nm) covered Fe 3 O 4 microcrystals provided efficient and recyclable catalytic performance (e.g., unprecedented high turnover frequency of 2.874 min −1 ) for 4-nitrophenol (4-NP). More importantly, the proposed Fe 3 O 4 −Au MCs could be used to reduce 4-NP for more than six cycles, elaborating that Fe 3 O 4 −Au MCs are promising catalysts in the field of environmental purification.

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Wearable electronic textiles based on naturally biocompatible materials have drawn great attention for their wide applications in fields such as healthcare and smart clothes. Nevertheless, it is always difficult to deliver on full flexibility and wearable comfort for wearable devices. In this study, an extremely flexible and stable conductive electrode enabled by single-walled carbon nanotubes (SWCNTs)-coated prestretched wool yarn is proposed to optimize the wearability and comfort of wearable electronic textiles. The combination of pretension wool yarn, SWCNTs solution, and dyeing process enables the flexible electrode to deliver strong flexibility, comfort, weavability, conductivity, and stability. The wool yarn is dipped in a SWCNTs solution with 20% prestretched. Possessing a small resistance (whole sample:76.4Ω, unit:12.73 Ω/cm), the composite yarn remains 98% of the R/R 0 at 20% strain. After 500 tests of stretching, washing, and adhesion, the conductivity of the composite yarn remains perfectly stable. Conductive yarn can be seamlessly combined with fabric while showing good adaptability and stability in human activities. Therefore, SWCNTs/wool composite yarn electrodes have considerable potential in wearable textile electronic applications for healthcare-related scenarios.

We report on the development of a facile and rational template-free method to engineer three-dimensional (3D) intact hybrid electrodes for high-performance pseudocapacitance supercapacitor (SC) applications. A unique half-cell scheme with ceria nanoparticles embedded in nickel oxide (i.e., NiO@CeO2) electrode is developed via an in situ solvothermal and annealed methodology. Owing to the hierarchical structure nature of NiO@CeO2 and the conductive 3D foamed nickel (FN) substrate characteristics, the resultant of 3D NiO@CeO2 hybrid electrodes exhibits excellent capacity performance (1250.44 F g−1 at 1 A g−1) with a maximal energy density of 203 W h kg−1 at 2.21 kW kg−1. The enhanced specific capacitance is attributed to the coexisting oxygen vacancies and the nanoscale effect in the developed 3D NiO@CeO2 architecture, facilitating the charge transfer rate between electrodes and electrolyte interfaces with elaborating high electrical conductivity. Moreover, in the 2000 cycles evaluation process, a high-power specific capacitance is demonstrated in the first few cycles of charge and discharge processes with 88% capacitive retention rate, illustrating that the developed electrodes could be considered a primary promising candidate for sustainable energy storage and conversion supercapacitor applications.