Flexible all-solid-state supercapacitors are fabricated with liquid-exfoliated black-phosphorus (BP) nanoflakes as an electrode material. These devices deliver high specific volumetric capacitance, power density, and energy density, up to 13.75 F cm(-3) , 8.83 W cm(-3) , and 2.47 mW h cm(-3) , respectively, and an outstanding long life span of over 30 000 cycles, demonstrating the excellent performance of the BP nanoflakes as a flexible electrode material in electrochemical energy-storage devices.

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Element doping allows manipulation of the electronic properties of 2D materials. Enhanced transport performances and ambient stability of black-phosphorus devices by Te doping are presented. This provides a facile route for achieving airstable black-phosphorus devices.

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Black phosphorous (BP) is a unique layered p-type semiconducting material. The successful use of BP nanosheets in fi eld-effect transistors fueled research on BP atomic layers that focuses on, e.g., the exploration of their optical and electronic properties, and promising applications in (opto)electronics. However, BP fi lms are prone to degradation in ambient conditions, which prevents their commercial application. Here, a route to the application of BP fi lms as an environmental stable nonvolatile resistive random access memory is presented. The BP fi lms, which are prepared from exfoliated BP nanosheets in selected solvents, show solvent-dependent degradation upon ambient exposure, inducing the formation of an amorphous top degraded layer (TDL). The TDL acts as an insulating barrier just below the Al electrode. This property that was only obtained by degradation, confers a bipolar resistive switching behavior with a high ON/OFF current ratio up to ~3 × 10 5 and excellent retention ability over 10 5 s to the fl exible BP memory devices. The TDL also prevents propagation of degradation further into the fi lm, ensuring excellent memory performance even after three month of ambient exposure.

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In this work, self‐supporting three‐dimensional hierarchical nanostructured MoS2@Ni(OH)2 nanocomposites are synthesized via a facile single‐mode microwave hydrothermal technique. The fabricated MoS2@Ni(OH)2 nanocomposites for supercapacitors in aqueous electrolyte exhibit higher specific capacitance and better cyclic stability than those of MoS2 and Ni(OH)2 due to the pronounced synergistic effect between MoS2 and Ni(OH)2. Further, the flexible all‐solid‐state supercapcitor is readily constructed by composing the PVA/KOH gel electrolyte in between two MoS2@Ni(OH)2 electrodes on the flexible PET substrates. The resulting supercapacitors can operate at high rate up to 1000 V/s, have excellent long‐life cycling stability, retaining 94.2% of the initial capacitance after 9000 cycles, and mechanical flexibility during extreme bending, respectively. Thereby, the MoS2@Ni(OH)2 nanocomposites are a promising electrode materials for flexible long‐life cycling all‐solid‐sate supercapacitors.

CoS nanoparticles and CoS/reduced graphene oxide (CoS/rGO) nanohybrids were fabricated by a unique single-mode microwave-assisted hydrothermal method. The microwave absorption properties of CoS/rGO composites with different rGO proportions were investigated. Morphology analysis indicated that the CoS nanoparticles were uniformly embedded into rGO without aggregation. The complex permittivity of CoS/rGO nanohybrids could be artificially tuned with the rGO proportions. For the CoS/rGO 1:2 composite, the minimum reflection loss (RL) of -56.9 dB was achieved at 10.9 GHz for the thickness of 2.2 mm; meanwhile, the RL exceeding -10 dB were obtained in the frequency range of 9.1-13.2 GHz. Compared with other rGO-based materials, CoS/rGO composite exhibited superior microwave absorption ability at a rather thin thickness and it has great potential to be used as a high-efficiency and tunable microwave absorber.