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A facile synthesis of CuSe nanosheets for high-performance sodium-ion hybrid capacitors.

ABSTRACT: Due to the low price and abundant reserves of sodium resources, sodium-ion batteries have become the main candidate for the next generation of energy storage equipment, particularly for large-scale grid storage and low-speed electric vehicles. Transition metal selenides have attracted considerable attention because of their high reversible capacity, superior electrical conductivity and versatile structures. In this study, two-dimensional CuSe nanosheets are synthesized via a simple hydrothermal reaction. When acting as an electrode material for sodium-ion batteries, the CuSe electrode exhibits an initial coulombic efficiency of 96.7% at a current density of 0.1 A g^-1 and a specific capacity of 330 mA h g^-1 after 100 operation cycles, as well as retains a specific capacity of 211 mA h g^-1 even at a high current density of 10 A g^-1. Moreover, the anode delivers a specific capacity of 236 mA h g^-1 after 3300 cycles at 5 A g^-1 with a capacity retention of 91.2%. In sodium-ion hybrid capacitors (SHICs) with the two-dimensional CuSe nanosheets and Ti₃C₂T _x MXene as the negative and positive materials, respectively, the nanosheets without any pre-sodiation present a lifespan of up to 2000 cycles at 2 A g^-1 and a capacity retention of about 77.7%.

SUBMITTER: Chen C

PROVIDER: S-EPMC9346626 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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A facile synthesis of CuSe nanosheets for high-performance sodium-ion hybrid capacitors.

Chen Chen C Hu Qilin Q Yang Fan F Xue Hongyu H Zhang Yuning Y Yan Hailong H Lu Yang Y Luo Yongsong Y

RSC advances 20220701 33

Due to the low price and abundant reserves of sodium resources, sodium-ion batteries have become the main candidate for the next generation of energy storage equipment, particularly for large-scale grid storage and low-speed electric vehicles. Transition metal selenides have attracted considerable attention because of their high reversible capacity, superior electrical conductivity and versatile structures. In this study, two-dimensional CuSe nanosheets are synthesized <i>via</i> a simple hydrot ...[more]

PMID: 35975047

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Project description:Potassium-ion hybrid capacitors (PIHCs) have been considered as promising potentials in mid- to large-scale storage system applications owing to their high energy and power density. However, the process involving the intercalation of K+ into the carbonaceous anode is a sluggish reaction, while the adsorption of anions onto the cathode surface is relatively faster, resulting in an inability to exploit the advantage of high energy. To achieve a high-performance PIHC, it is critical to promote the K+ insertion/desertion in anodic materials and design suitable cathodic materials matching the anodes. In this study, we propose a facile "homologous strategy" to construct suitable anode and cathode for high-performance PIHCs, that is, unique multichannel carbon fiber (MCCF)-based anode and cathode materials are firstly prepared by electrospinning, and then followed by sulfur doping and KOH activation treatment, respectively. Owing to a multichannel structure with a large interlayer spacing for introducing S in the sulfur-doped multichannel carbon fiber (S-MCCF) composite, it presents high capacity, super rate capability, and long cycle stability as an anode in potassium-ion cells. The cathode composite of activated multichannel carbon fiber (aMCCF) has a considerably high specific surface area of 1445 m2 g-1 and exhibits outstanding capacitive performance. In particular, benefiting from advantages of the fabricated S-MCCF anode and aMCCF cathode by homologous strategy, PIHCs assembled with the unique MCCF-based anode and cathode show outstanding electrochemical performance, which can deliver high energy and power densities (100 Wh kg-1 at 200 W kg-1, and 58.3 Wh kg-1 at 10,000 W kg-1) and simultaneously exhibit superior cycling stability (90% capacity retention over 7000 cycles at 1.0 A g-1). The excellent electrochemical performance of the MCCF-based composites for PIHC electrodes combined with their simple construction renders such materials attractive for further in-depth investigations of alkali-ion battery and capacitor applications.

Dataset Information

A facile synthesis of CuSe nanosheets for high-performance sodium-ion hybrid capacitors.

Publications

A facile synthesis of CuSe nanosheets for high-performance sodium-ion hybrid capacitors.

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