No abstract

No abstract

No abstract

GeP 5 , as the most representative phosphorus-based material in two-dimensional layered phosphorous compounds, has shown a fairly bright application prospect in the field of energy storage because of its ultrahigh electrical conductivity. However, high-yield exfoliation methods and effective structure construction strategies for GeP 5 nanosheets are still missing, which completely restricts the further application of GeP 5 -based nanocomposites. Here, we not only improved the yield of GeP 5 nanosheets by a liquid nitrogen-assisted liquid-phase exfoliation technique but also constructed the GeP 5 @RuO 2 nanocomposites with the 0D/2D heterostructure by in situ introduction of ultrafine RuO 2 nanoparticles on highly conductive GeP 5 nanosheets using a simple hydrothermal synthesis method, and then applying it to microsupercapacitors (MSCs) as electrode materials through a mask-assisted vacuum filtration technique. It is precisely because of the synergy of the electrical double-layer material, GeP 5 nanosheets and the pseudocapacitance material RuO 2 nanoparticles that endows the GeP 5 @ RuO 2 electrode with outstanding electrochemical performance in micro-supercapacitors with a large specific capacitance of 129.5 mF cm −2 /107.9 F cm −3 , high energy density of 17.98 μWh cm −2 , remarkable long-term cycling stability with 98.4% capacitance retention after 10 000 cycles, the exceptional mechanical stability, outstanding environmental stability, and excellent integration features. This work opens up a new avenue to construct GeP 5 -based nanocomposites as a most promising novel electrode material for practical application in flexible portable/wearable micro-nanoelectronic devices.

High-mechanical strength and flexible multifunctional composite films with superior electromagnetic interface (EMI) shielding and rapid-response Joule heating are of urgent demand for the development of wearable devices. Herein, we fabricated the aramid nanofibers (ANFs)/bacterial cellulose (BC)/graphene nanosheets (GNs)/nickel nanoparticles (Ni NPs) composite films via vacuum-assisted filtration followed by the electron beam evaporation method. Mechanical properties of ANF/BC composite papers could be tuned by changing the weight ratio of ANFs and BC. Benefiting from the outstanding electrical conductivity of the magnetic Ni NPs, the ANF/BC-3/GNs/Ni-300 composite film (ANF/BC-3 represents that the weight ratio of ANFs to BC is 7:3, and Ni-300 represents that the thickness of Ni is 300 nm) exhibited superior electrical conductivity up to 328 S/cm and displayed superb EMI shielding effectiveness exceeding 50 dB in the whole X band (8–12.4 GHz). Meanwhile, the EMI shielding effectiveness of the film could still be maintained above 40 dB after bending 1000 times by 150° due to the excellent tensile properties of ANF/BC-3 films. Furthermore, the ANF/BC-3/GNs/Ni-300 composite film also showed great Joule heating performance (135 °C at 5 V) with rapid response (<7 s), durability and repeatability (50 cycles), and long-term stability (1800 s) without obvious temperature fluctuation. These results showed that the ANF/BC-3/GNs/Ni-300 composite film could be used in intelligent wearable devices and maintain excellent electromagnetic shielding performances.