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Exfoliation joint
Nanosheet
Phosphorene
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It is difficult for traditional cooling liquids to meet equipment requirements due to the high power and high integration they demand. Nanofluids are nanoparticle dispersions with high thermal conductivities, thus they have been proposed for heat transfer applications. Boron nitride nanosheets (BNNSs) possess high thermal conductivities and excellent insulation properties. Here, we fabricated BNNS nanofluids and investigated their effects on thermal conductivity enhancements. We find that BNNSs can effectively enhance the thermal conductivity of water. The thermal conductivity of the BNNS nanofluids reached 2.39 W mK-1 at 24 vol% loading. The surface temperature changes of the nanofluids and water were observed during the heating process using an infrared camera. The results show that the nanofluids transfer heat much faster than water, indicating that the fabricated BNNS nanofluids have excellent thermal transfer properties.
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Phosphorene has great potential in many applications. Here in this work, we succeed in exfoliating phosphorene directly in water by using sonication and microwave without additives, wherein violent oscillation generated by sonication facilitates intercalation of water into black phosphorus interlayers, and then the microwave further exfoliates the black phosphorus into phosphorene. The result demonstrates that this exfoliation method offers outstanding exfoliation efficiency. More importantly, the phosphorene dispersions exfoliated by our method may be directly used for future applications development. We succeed in exfoliating phosphorene directly in water by using sonication and microwave without additives. Wherein, violent oscillation generated by sonication facilitates intercalation of water molecular into black phosphorus interlayers, and then the microwave further exfoliates the black phosphorus into phosphorene. The result demonstrates that this method offers outstanding exfoliation efficiency compared to sonication alone and microwave alone.
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Black phosphorus (BP) as a rising star among 2D materials has attracted attention for a wide range of applications due to its fascinating properties. The key point for the real application of phosphorene depends on its exfoliation technique to produce high‐quality nanosheets. In recent years, tremendous efforts have been made in the preparation and energy storage application of phosphorene and phosphorene‐based hybrid electrodes. Herein, the state‐of‐the‐art liquid‐based exfoliation and characterization of phosphorene fabricated by sonication, anodic and cathodic electrochemical exfoliation, and bipolar electrochemical exfoliation in diverse solutions and conditions are discussed. In addition, the electrochemical properties and storage mechanism of phosphorene‐based electrodes for rechargeable batteries and supercapacitors are discussed. Finally, the challenges and opportunities of phosphorene nanosheets in terms of exfoliation and energy storage applications are addressed.
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Energy Storage Devices In article number 2000148, Amin Rabiei Baboukani, Chunlei Wang, and co-workers summarize the fundamentals and latest advances in liquid-based exfoliation of black phosphorus into phosphorene nanosheet and its application for rechargeable batteries and supercapacitors. Effects of exfoliation parameters through sonication, electrochemical, and bipolar exfoliation are systematically discussed. This work inspires efforts to further investigate phosphorene nanosheets for advanced energy storage devices.
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We report the liquid exfoliation of black phosphorus to form few-layer phosphorene nanosheets.
Phosphorene
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Black Phosphorus
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Black phosphorus (BP) as a two-dimensional material has attracted attention for various applications from energy storage to biomedical devices due to its exceptional physical and chemical properties such as tunable bandgap and high charge carrier mobility. However, the key step therefore towards the application of BP is the preparation of few-layer phosphorene. Different methods have been evaluated to exfoliate BP such as mechanical, liquid and electrochemical exfoliation. Most of them are multi-step and time-consuming, and less attractive for practical applications. In this study, we propose a novel and straightforward two-in-one bipolar exfoliation technique to exfoliate BP into phosphorene nanosheets in DI water, which are then dragged electrophoretically to be deposited on a conductive substrate. The exfoliated-and-deposited BP nanosheets were characterized with different microscopic and spectroscopic techniques, revealing thin layers of phosphorene with orthorhombic crystal structure and lateral dimensions up to a few hundreds of nanometers. The electrochemical characterization of the phosphorene-modified positive feeding electrode showed a fractional-order capacitive behavior with high power density of 350 μW cm -2 at a constant current rate of 0.5 mA cm -2 and discharge energy of 22.8 nWh cm -2 recoverable with very high efficiency after 40000 of charge/discharge cycles. In this conference, detailed novel bipolar exfoliation and deposition of phosphorene nanosheets and its electrochemical characterization will be presented.
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