Self-standing manganese dioxide/graphene carbon nanotubes film electrode for symmetric supercapacitor with high energy density and superior long cycling stability

Gong, Daxiong; Tong, Hao; Xiao, Jianfeng; Li, Tingting; Liu, Jiang; Wu, Yuan; Chen, Xvdong; Liu, Jie; Zhang, Xiaogang

doi:10.1016/j.ceramint.2021.08.202

Cited by 21 publications

(4 citation statements)

References 45 publications

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“…In addition, it can be also obviously seen that the slope of the line of the MM-75 electrode in the low-frequency region is the largest, indicating its best capacitive behavior and fastest charge diffusion rate in the electrode material [57]. In brief, it can be attributed to the close combination and the synergistic effect of Ti 3 C 2 T x and MnO 2 , which regulates and improves the sluggish kinetics of MnO 2 [58], also indicating the composite electrode is more conducive to ion transport and charge storage. Cycle stability, a significant factor to evaluate potential application of the electrode materials, was also conducted at a constant current density of 5 A•g −1 in the three-electrode system.…”

Section: Resultsmentioning

confidence: 91%

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

et al. 2023

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Combining the new two-dimensional conductive MXene with transition metal oxide to build composite structure is a promising path to improve the conductivity of metal oxide. However, a critical challenge still remains in how to achieve a good combination of MXene and metal oxide. Herein, we develop a facile hydrothermal route to synthesize the MnO2/Ti3C2Tx composite electrode for supercapacitors by synergistically coupling MnO2 nanowires with Ti3C2Tx MXene nanoflakes. Compared with the pure MnO2 electrode, the morphology of the MnO2/Ti3C2Tx composite electrode changes from nanowires to nanoflowers. Moreover, the overall conductivity and electrochemical performance of the composite electrode are greatly improved due to an addition of Ti3C2Tx MXene. The specific capacitance of the MnO2/Ti3C2Tx composite electrode achieves 210.8 F·g-1 at a scan rate of 2 mV·s-1, while that of the pure MnO2 electrode is only 55.2 F·g-1. Furthermore, the specific capacitance of the MnO2/Ti3C2Tx composite electrode still can remain at 97.2% even after 10000 charge-discharge cycles, revealing an excellent cycle stability. The synthesis strategy of this work can pave the way for the research and practical application of the electrode materials for supercapacitors.

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Section: Resultsmentioning

confidence: 91%

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

et al. 2023

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“…75 However, pure MnO 2 has a low electrical conductivity, which restricts its functional performance. 76 As a result, adding another metal oxide material, conductive carbon, or a conductive polymer, to MnO 2 composites has proven to be a successful alternative for this problem. 77 As the crystalline structure of crystallized MnO 2 materials, precisely the size of the tunnels that can provide regulated cation intercalation, is crucial to their capacitance, numerous investigations into these materials have been performed.…”

Section: Introductionmentioning

confidence: 99%

“…It is possible to synthesize multiple morphologies of pure MnO 2 and create forms like nanorods, 71 nanowires, 72 nanoflowers, 73 hollow spheres, 74 and nanotubes 75 . However, pure MnO 2 has a low electrical conductivity, which restricts its functional performance 76 . As a result, adding another metal oxide material, conductive carbon, or a conductive polymer, to MnO 2 composites has proven to be a successful alternative for this problem 77 …”

Section: Introductionmentioning

confidence: 99%

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance

Diantoro

Istiqomah

Fath

et al. 2023

Int J Applied Ceramic Tech

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The development of materials and electrochemical energy storage (EES) technologies are currently taking the lead and showing excellent performance in the global effort to tackle the issues of sustainable energy supply. Supercapacitors have been widely studied among the EES technologies as they exhibit quick charging rates under high‐power conditions. Manganese dioxide (MnO2) has attracted renewed interest as a promising material due to its high theoretical capacitance and high energy density. However, the widespread application is immediately impacted by low conductivity. Hence, combining nanomaterials and various morphologies of MnO2 can improve the electrochemical performance of supercapacitors. This paper presents a review based on the composites of nanomaterials/MnO2 with various morphologies. Their mechanism and practical applications in supercapacitors are introduced in detail. Finally, the challenges and next steps in developing MnO2 electrode materials are proposed.

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“…Lots of methods have been reported to prepare MnO 2 /rGO composites, such as the chemical precipitation method (Gong et al, 2021), alcohol infiltrated substrate method (Zhang et al, 2020b), and hydrothermal route (Liu et al, 2015). Among these methods, the hydrothermal method is the most convenient way for synthesizing MnO 2 /rGO composites.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of MnO2/Graphene Flower-like Microspheres Prepared by Thermally-Exfoliated Graphite

Liang

Hong

et al. 2022

Front. Chem.

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To enhance the electrochemical performance of MnO2/graphene composite, herein, thermally-exfoliated graphite (TE-G) is adopted as a raw material, and a hydrothermal reaction is conducted to achieve the exfoliation of TE-G and the loading of MnO2 nanosheets. Through optimizing the TE-G/KMnO4 ratio in the redox reaction between carbon and KMnO4, flower-like MnO2/G microspheres (MnO2/G-10) are obtained with 83.2% MnO2 and 16.8% residual graphene. Meanwhile, corresponding MnO2/rGO composites are prepared by using rGO as raw materials. Serving as a working electrode in a three-electrode system, MnO2/G-10 composite displays a specific capacitance of 500 F g−1 at 1 A g−1, outstanding rate performance, and capacitance retention of 85.3% for 5,000 cycles. The performance is much better than that of optimized MnO2/rGO composite. We ascribe this to the high carbon fraction in TE-G resulting in a high fraction of MnO2 in composite, and the oxygen-containing groups in rGO reduce the resulting MnO2 fraction in the composite. The superior electrochemical performance of MnO2/G-10 is dependent on the hierarchical porous structure constructed by MnO2 nanosheet arrays and the residual graphene layer in the composite. In addition, a supercapacitor assembled by TE-G negative electrode and MnO2/G positive electrode also exhibits superior performance. In consideration of the low cost of raw materials, the MnO2/G composite exhibits great application potential in the field of supercapacitors.

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Self-standing manganese dioxide/graphene carbon nanotubes film electrode for symmetric supercapacitor with high energy density and superior long cycling stability

Cited by 21 publications

References 45 publications

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance

Electrochemical Performance of MnO2/Graphene Flower-like Microspheres Prepared by Thermally-Exfoliated Graphite

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Self-standing manganese dioxide/graphene carbon nanotubes film electrode for symmetric supercapacitor with high energy density and superior long cycling stability

Cited by 21 publications

References 45 publications

Rational design of flower-like MnO2/Ti3C2T x composite electrode for high performance supercapacitors

Rational design of flower-like MnO2/Ti3C2T x composite electrode for high performance supercapacitors

Potential of MnO2‐based composite and numerous morphological for enhancing supercapacitors performance

Electrochemical Performance of MnO2/Graphene Flower-like Microspheres Prepared by Thermally-Exfoliated Graphite

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Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance