Supercapacitor Electrodes from the in Situ Reaction between Two-Dimensional Sheets of Black Phosphorus and Graphene Oxide
Supercapacitor Electrodes from the in Situ Reaction between Two-Dimensional Sheets of Black Phosphorus and Graphene Oxide
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DOI：
10.1021/acsami.7b18853
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发表时间：
2018-03-28
影响因子：
9.5
通讯作者：
Derbye, Brian
中科院分区：
文献类型：
--
作者：
Cao, Jianyun;He, Pei;Derbye, Brian
二维材料作为高表面积电极在超级电容器等储能应用中显示出巨大的前景。单片石墨烯由于其原子级厚度而具有很大的比表面积。然而，为了将该区域有效地封装在设备中，必须将其限制在有限的三维体积内，而无需重新堆叠片面。在此，我们提出了一种通过使用混合薄膜来保持高表面积的方法，其中少层剥离的黑磷（BP）减少了氧化石墨烯（GO）薄片。当薄膜暴露于湿气时，BP和GO之间的氧化还原反应形成还原GO（RGO）和中间磷酸HxPOy的液体电解质的互穿网络。 RGO/HxPOy薄膜中液态HxPOy电解质的存在稳定并保留了开放通道结构，从而实现了快速离子扩散，当用作超级电容器电极时，具有优异的充电倍率能力（高达500 mV s(-1)，并在50 A g(-1)的大电流密度下保留62.3%的初始电容）。
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 HxPOy. The presence of the liquid HxPOy electrolyte in the RGO/HxPOy film stabilizes and preserves an open-channel structure enabling rapid ion diffusion, leading to an excellent charging rate capability (up to 500 mV s(-1) and retaining 62.3% of initial capacitance at a large current density of 50 A g(-1)) when used as electrodes in supercapacitors.