Effects of Impurities on the Electrochemical Characterization of Liquid-Phase Exfoliated Niobium Diselenide Nanosheets

被引:21
|
作者
Ahmad, Habib M. N. [1 ]
Ghosh, Sujoy [1 ,4 ]
Dutta, Gaurab [1 ]
Maddaus, Alec G. [2 ]
Tsavalas, John G. [3 ,5 ]
Hollen, Shawna [4 ,5 ]
Song, Edward [1 ,5 ]
机构
[1] Univ New Hampshire, Dept Elect & Comp Engn, Durham, NH 03824 USA
[2] Univ New Hampshire, Dept Chem Engn, Durham, NH 03824 USA
[3] Univ New Hampshire, Dept Chem, Durham, NH 03824 USA
[4] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA
[5] Univ New Hampshire, Mat Sci Program, Durham, NH 03824 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 14期
关键词
TRANSITION-METAL DICHALCOGENIDES; HYDROGEN EVOLUTION REACTION; MOS2; NANOSHEETS; INTERCALATION; NANOPARTICLES; NANOCRYSTALS; STABILITY; ELECTRODE; REDUCTION; SURFACES;
D O I
10.1021/acs.jpcc.9b00485
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Commercially available bulk niobium diselenide (NbSe2) reduced into nanomaterials upon exfoliation typically contains oxide and carbide impurities. Liquid-phase exfoliated two-dimensional (2D) nanosheets of NbSe2 obtained from bulk powders provide high charge mobility and large surface area but become self-passivated and chemically inert as the presence of oxide impurities makes them behave more semimetallic. In this article, we report the effects of inherent impurities of liquid-phase exfoliated 2D NbSe2 (intended to be integrated as supercapacitor electrodes) on the electrochemical performance. The highest specific capacitances achieved using 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) and sulfuric acid (1 M H2SO4) electrolytes were 4955.5 +/- 21.5 and 13 361.6 +/- 31.8% mF/cm(2), respectively, which were affected by the impurities, oxophilicity of niobium defects, and moisture adsorption in the cell. Galvanostatic charge-discharge profiles show moisture adsorption affecting the high-energy charging procedure in the cell for BMIMPF6, resulting in leakage and decomposition of the electrolyte. Electrochemical impedance spectroscopy provides insights into the solid-electrolyte interphase and charge-transfer mechanisms at exfoliated 2D NbSe2 nanosheets, which affect the ion intercalation through heterogenous phases of the nanosheets. Overall, the NbSe2 nanosheets offer heterogenous phases because of the coexistence of Nb2O5 that influences the charge-transfer mechanism at the exfoliated surfaces.
引用
收藏
页码:8671 / 8680
页数:10
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