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