Favorable anion adsorption/desorption of high rate NiSe 2 nanosheets/hollow mesoporous carbon for battery-supercapacitor
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Favorable anion adsorption/desorption of high rate NiSe2 nanosheets/hollow mesoporous carbon for battery-supercapacitor hybrid devices Xiaojuan Zhao1, Houzhao Wan1 (), Pei Liang2 (), Nengze Wang1, Cong Wang1, Yi Gan1, Xu Chen1,3, Qiuyang Tan1, Xiang Liu1, Jun Zhang1, Yi Wang3, Hanbin Wang1 (), and Hao Wang1 () Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, School of Microelectronics and Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, China 2 College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China 3 Max Planck Institute for Solid State Research, Heisenbergstr 1, 70569 Stuttgart, Germany 1
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 26 August 2020 / Revised: 22 November 2020 / Accepted: 22 November 2020
ABSTRACT High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid (BSH) devices. Herein, a core-shell structure of the hollow mesoporous carbon spheres (HMCS) supported NiSe2 nanosheets (HMCS/NiSe2) is constructed through two-step reactions. The HMCS/NiSe2 shows a max specific capacity of 1,153.5 C·g−1 at the current density of 1 A·g−1, and can remain at 774.5 C·g−1 even at 40 A·g−1 (the retention rate as high as 67.1%) and then the HMCS/NiSe2 electrode can keep 80.5% specific capacity after 5,000 cycles at a current density of 10 A·g−1. Moreover, the density functional theory (DFT) calculation confirmed that the introduction HMCS into NiSe2 made adsorption/desorption of OH− easier, which can achieve higher rate capability. The HMCS/NiSe2//6 M KOH//HMCS hybrid device has energy density of 47.15 Wh·kg−1 and power density of 801.8 W·kg−1. This work provides a feasible electrode material with a high rate and its preparation method for high energy density and power density energy storage devices.
KEYWORDS nickel selenide, mesoporous carbon, supercapacitor, high rate, core-shell structure
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Introduction
With the increasingly serious problem of energy shortage and environmental pollution, it is of great significance to develop a storage device eco-friendly and reliable [1–8]. Supercapacitor has gradually become a comparatively ideal energy storage device with high power density and excellent cycle stability. However, the capacitance of the traditional electric double-layer capacitor (EDLC) with electrolyte ions adsorption/desorption on the surface is lower than the battery with ions implantation/ detachment in solid phase [9–11]. Meanwhile, the power density of batteries is comparatively lower than the supercapacitors based on the above energy storage mechanisms. It is a feasible way to develop a battery-supercapacitor hybrid (BSH) device to satisfy both high energy density and high power density [12]. The key to developing high-performance BSH devices is to design and research high-performance cathode materials [13–15]. Recent years, the transition metallic compounds, such as metal oxides, metal sulfides applied in
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