Boosting supercapacitor efficiency with <italic style="font-style: italic">δ</italic>-MnO<sub>2</sub>nanoflakes on electrochemically exfoliated graphene nanosheets

Li Qian; Zheng Hu; Li Cuiping; Li Li; Lin Ying; Hao Qin; Xu Caixia; Wang Kai

doi:10.1016/j.cjche.2025.08.022

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Boosting supercapacitor efficiency with δ-MnO₂nanoflakes on electrochemically exfoliated graphene nanosheets

Updated：2026-03-13

- Boosting supercapacitor efficiency with δ-MnO₂nanoflakes on electrochemically exfoliated graphene nanosheets
- Chinese Journal of Chemical Engineering Vol. 89, Issue 1, Pages: 249-258(2026)
- Affiliations：
  
  Institute for Advanced Interdisciplinary Research, School of Chemistry and Chemical Engineering, Shandong Key Laboratory of Functional Materials for Integrated Lithium Niobate Photonic, University of Jinan, Jinan 250022, China
  College of Food Engineering, Qingdao Institute of Technology, Qingdao 266300, China
  Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  Corresponding authors. E-mail addresses: chm_xucx@ujn.edu.cn(C. Xu)
  wangkai@mail.iee.ac.cn(K. Wang).
- Funds：
- DOI：10.1016/j.cjche.2025.08.022
  CLC：
- Received：19 March 2025，
  
  Revised：2025-06-25，
  
  Accepted：04 August 2025，
  
  Online First：08 November 2025，
  
  Published：2026-01
- Accepted：
Scan QR Code
Li Qian, Zheng Hu, Li Cuiping, et al. Boosting supercapacitor efficiency with δ-MnO₂nanoflakes on electrochemically exfoliated graphene nanosheets[J]. Chinese Journal of Chemical Engineering, 2026, 89(1): 249-258. DOI: 10.1016/j.cjche.2025.08.022.
DOI：

Li Qian, Zheng Hu, Li Cuiping, et al. Boosting supercapacitor efficiency with δ-MnO₂nanoflakes on electrochemically exfoliated graphene nanosheets[J]. Chinese Journal of Chemical Engineering, 2026, 89(1): 249-258. DOI: 10.1016/j.cjche.2025.08.022. DOI：

摘要

Abstract

Supercapacitors represent one specific class of energy storage devices that bridge the gap between traditional capacitors and batteries. In current work

-MnO

nanoflakes arrayed on electrochemically exfoliated graphene (EEG) nanosheets were easily made as one composited electrode material for boosting the charge storage performances of supercapacitors. Coupled with the fluent electron and ion transport from two-dimensional EEG nanosheets

the uniformly anchored δ-MnO

nanoflake arrays present high reversible capacity

superior cycling stability

and unique rate capability. As expected

the MnO

/EEG-10 electrode delivers high specific capacitance of 190 F·g

- 1

at 0.2 A·g

- 1

and holds 97.3% of its initial capacitance after 10000 cycles at 5 A·g

- 1

. Furthermore

an asymmetrical supercapacitor using MnO

/EEG-10 as the positive electrode achieves an energy density of 17.7 W·h·kg

- 1

at a power density of 922.7 W·kg

- 1

with 82.9% capacity retention upon 10000 cycles at 5 A·g

- 1

. This work highlights the facile fabrication of high-performance MnO

/graphene composites with excellent structure stab

ility using graphene nanosheets as the conductive matrix.

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Keywords

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⁰

Boosting supercapacitor efficiency with δ-MnO2nanoflakes on electrochemically exfoliated graphene nanosheets

DOI：10.1016/j.cjche.2025.08.022

摘要

Abstract

关键词

Keywords

references

Boosting supercapacitor efficiency with δ-MnO₂nanoflakes on electrochemically exfoliated graphene nanosheets