15 research outputs found

    Supercapacitor Electrodes from the in Situ Reaction between Two-Dimensional Sheets of Black Phosphorus and Graphene Oxide

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    Two-dimensional materials show considerable promise as high surface area electrodes for energy-storage applications such as supercapacitors. A single sheet of graphene possesses a large specific surface area because of its atomically thin thickness. However, to package this area efficiently in a device, it must be confined within a finite three-dimensional volume without restacking of the sheet faces. Herein, we present a method of maintaining the high surface area through the use of a hybrid thin film in which few-layer-exfoliated black phosphorus (BP) reduces graphene oxide (GO) flakes. When the film is exposed to moisture, a redox reaction between the BP and the GO forms an interpenetrating network of reduced GO (RGO) and a liquid electrolyte of intermediate phosphorus acids H<sub><i>x</i></sub>PO<sub><i>y</i></sub>. The presence of the liquid H<sub><i>x</i></sub>PO<sub><i>y</i></sub> electrolyte in the RGO/H<sub><i>x</i></sub>PO<sub><i>y</i></sub> film stabilizes and preserves an open-channel structure enabling rapid ion diffusion, leading to an excellent charging rate capability (up to 500 mV s<sup>–1</sup> and retaining 62.3% of initial capacitance at a large current density of 50 A g<sup>–1</sup>) when used as electrodes in supercapacitors
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