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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2022, Vol. 16 Issue (3) : 420-432    https://doi.org/10.1007/s11705-021-2065-7
RESEARCH ARTICLE
Tripotassium citrate monohydrate derived carbon nanosheets as a competent assistant to manganese dioxide with remarkable performance in the supercapacitor
Wenjing Zhang1, Xiaoxue Yuan1, Xuehua Yan1,2(), Mingyu You1, Hui Jiang1, Jieyu Miao1, Yanli Li1, Wending Zhou1, Yihan Zhu1, Xiaonong Cheng1
1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
2. Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China
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Abstract

Production cost, capacitance, and electrode materials safety are the key factors to be concerned about for supercapacitors. In this work, a type of carbon nanosheets was produced through the carbonization of tripotassium citrate monohydrate and nitric acidification. Subsequently, a well-designed manganese dioxide/carbon nanosheets composite was synthesized through hydrothermal treating. The carbon nanosheets served as the substrate for growing the manganese dioxide, regulating its distribution, and preventing it from inhomogeneous dimensions and severe agglomeration. Many manganese dioxide nanosheets grew vertically on the numerous functional groups generated on the surface of the carbon nanosheets during acidification. The synergistic combination of carbon nanosheets and manganese dioxide tailors the electrochemical performance of the composite, which benefits from the excellent conductivity and stability of carbon nanosheets. The carbon nanosheets derived from tripotassium citrate monohydrate are conducive to the remarkable performance of manganese dioxide/carbon nanosheets electrode. Finally, an asymmetric supercapacitor with active carbon as the cathode and manganese dioxide/carbon nanosheets as the anode was assembled, achieving an outstanding energy density of 54.68 Wh·kg–1 and remarkable power density of 6399.2 W·kg–1 superior to conventional lead-acid batteries. After 10000 charge-discharge cycles, the device retained 75.3% of the initial capacitance, showing good cycle stability. Two assembled asymmetric supercapacitors in series charged for 3 min could power a yellow light emitting diode with an operating voltage of 2 V for 2 min. This study may provide valuable insights for applying carbon materials and manganese dioxide in the energy storage field.

Keywords carbon nanosheets      manganese dioxide      asymmetric supercapacitors      energy density      power density     
Corresponding Author(s): Xuehua Yan   
Online First Date: 13 July 2021    Issue Date: 24 February 2022
 Cite this article:   
Wenjing Zhang,Xiaoxue Yuan,Xuehua Yan, et al. Tripotassium citrate monohydrate derived carbon nanosheets as a competent assistant to manganese dioxide with remarkable performance in the supercapacitor[J]. Front. Chem. Sci. Eng., 2022, 16(3): 420-432.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-021-2065-7
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I3/420
Fig.1  Schematic diagram for the preparation of MnO2/CNS.
Fig.2  (a) XRD patterns and (b) Raman spectra of CNS and MnO2/CNS; (c–f) XPS patterns of MnO2/CNS: (c) full scans of C, O, and Mn, (d) scan of C1s, (e) O1s, and (f) Mn2p.
Fig.3  SEM images of (a) acidless-treated CNS, (b) active CNS, (c) MnO2, and (d) MnO2/CNS.
Fig.4  TEM images of (a) active CNS, and (b) MnO2/CNS; AFM image of (c) active CNS, and (d) thickness curve for active CNS.
Fig.5  (a) SEM image of MnO2/CNS; EDS mappings of (b) C, (c) O, and (d) Mn.
Fig.6  (a) CV curves of CNS, MnO2, and MnO2/CNS at the scan rate of 100 mV·s–1; (b) GCD curves of CNS, MnO2 and MnO2/CNS at the current density of 1 A·g–1; (c) rate capabilities and (d) Nyquist plots of CNS, MnO2 and MnO2/CNS.
Fig.7  (a) CV curves of MnO2/CNS at different scan rates; (b) plots of log (scan rate) versus log (peak current); (c) surface capacitive CV curves of 10 mV·s–1; (d) contribution ratios of surface capacitive and diffusion-controlled process at different scan rates.
Fig.8  (a) Schematic diagrams of ASC; (b) CV curves of ASC from 1.0 to 1.8 V at the scan rate of 100 mV·s–1; (c) GCD profiles of ASC from 1.0 to 1.6 V at the current density of 1 A·g–1; (d) schematic diagrams of two devices in series and in paralleled; CV curves of one device and two devices (e) in series and (f) in paralleled.
Fig.9  (a) CV curves of ASC at different scan rates; (b) GCD profiles of ASC at different current densities; (c) rate capability and coulombic effciency of ASC.
Fig.10  (a) Ragone plot of ASC; (b) cyclic testing of ASC; (c) Nyquist plots of ASC before and after cycle testing; (d) two devices linked in series light a LED of 2 V.
Electrode Material Electrolyte Potential window E/(Wh?kg–1) P/(W?kg–1) Ref.
MnO2/CNS//AC 3 mol?L–1 KOH 0–1.6 V 54.68 6399.2 This work
MnO2/CNTs//AC 1 mol?L–1 Na2SO4 0–1.5 V 13.3 600 [42]
MnO2@N-APC//NAPC 1 mol?L–1 Na2SO4 0–2 V 28 560 [43]
HCNF-MnO2//HCNF-MnO2 PVA-Na2SO4 0–1.6 V 30.5 3090 [44]
MnO2@PANI@CNF//CNF 1 mol?L–1 H2SO4 –0.5–1.6 V 43 1650 [45]
MnO2@CQDs@GA//MnO2@CQDs@GA 1 mol?L–1 Na2SO4 0–2 V 38.2 1000 [46]
MnO2@CNT@NCT//CNT@NCT PVA-Na2SO4 0–1.8 V 5.5 3600 [47]
MnO2//MnO2 PVA-Na2SO4 0–1.6 V 32 1390 [48]
PPy-MnO2//PPy-MnO2 PVA-Na2SO4 0–1.2 V 37.63 830 [49]
Tab.1  Comparison of ASCs based on MnO2/CNS//AC with the reported ASCs based on MnO2 in terms of the maximum for energy density (E) and power density (P) [4249].
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