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Freestanding three-dimensional graphene/MnO2 composite networks as ultralight and flexible supercapacitor electrodes.
ACS Nano. 2013 Jan 22; 7(1):174-82.AN

Abstract

A lightweight, flexible, and highly efficient energy management strategy is needed for flexible energy-storage devices to meet a rapidly growing demand. Graphene-based flexible supercapacitors are one of the most promising candidates because of their intriguing features. In this report, we describe the use of freestanding, lightweight (0.75 mg/cm(2)), ultrathin (<200 μm), highly conductive (55 S/cm), and flexible three-dimensional (3D) graphene networks, loaded with MnO(2) by electrodeposition, as the electrodes of a flexible supercapacitor. It was found that the 3D graphene networks showed an ideal supporter for active materials and permitted a large MnO(2) mass loading of 9.8 mg/cm(2) (~92.9% of the mass of the entire electrode), leading to a high area capacitance of 1.42 F/cm(2) at a scan rate of 2 mV/s. With a view to practical applications, we have further optimized the MnO(2) content with respect to the entire electrode and achieved a maximum specific capacitance of 130 F/g. In addition, we have also explored the excellent electrochemical performance of a symmetrical supercapacitor (of weight less than 10 mg and thickness ~0.8 mm) consisting of a sandwich structure of two pieces of 3D graphene/MnO(2) composite network separated by a membrane and encapsulated in polyethylene terephthalate (PET) membranes. This research might provide a method for flexible, lightweight, high-performance, low-cost, and environmentally friendly materials used in energy conversion and storage systems for the effective use of renewable energy.

Authors+Show Affiliations

School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China. heyongming11@163.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23249211

Citation

He, Yongmin, et al. "Freestanding Three-dimensional graphene/MnO2 Composite Networks as Ultralight and Flexible Supercapacitor Electrodes." ACS Nano, vol. 7, no. 1, 2013, pp. 174-82.
He Y, Chen W, Li X, et al. Freestanding three-dimensional graphene/MnO2 composite networks as ultralight and flexible supercapacitor electrodes. ACS Nano. 2013;7(1):174-82.
He, Y., Chen, W., Li, X., Zhang, Z., Fu, J., Zhao, C., & Xie, E. (2013). Freestanding three-dimensional graphene/MnO2 composite networks as ultralight and flexible supercapacitor electrodes. ACS Nano, 7(1), 174-82. https://doi.org/10.1021/nn304833s
He Y, et al. Freestanding Three-dimensional graphene/MnO2 Composite Networks as Ultralight and Flexible Supercapacitor Electrodes. ACS Nano. 2013 Jan 22;7(1):174-82. PubMed PMID: 23249211.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Freestanding three-dimensional graphene/MnO2 composite networks as ultralight and flexible supercapacitor electrodes. AU - He,Yongmin, AU - Chen,Wanjun, AU - Li,Xiaodong, AU - Zhang,Zhenxing, AU - Fu,Jiecai, AU - Zhao,Changhui, AU - Xie,Erqing, Y1 - 2012/12/31/ PY - 2012/12/20/entrez PY - 2012/12/20/pubmed PY - 2013/6/29/medline SP - 174 EP - 82 JF - ACS nano JO - ACS Nano VL - 7 IS - 1 N2 - A lightweight, flexible, and highly efficient energy management strategy is needed for flexible energy-storage devices to meet a rapidly growing demand. Graphene-based flexible supercapacitors are one of the most promising candidates because of their intriguing features. In this report, we describe the use of freestanding, lightweight (0.75 mg/cm(2)), ultrathin (<200 μm), highly conductive (55 S/cm), and flexible three-dimensional (3D) graphene networks, loaded with MnO(2) by electrodeposition, as the electrodes of a flexible supercapacitor. It was found that the 3D graphene networks showed an ideal supporter for active materials and permitted a large MnO(2) mass loading of 9.8 mg/cm(2) (~92.9% of the mass of the entire electrode), leading to a high area capacitance of 1.42 F/cm(2) at a scan rate of 2 mV/s. With a view to practical applications, we have further optimized the MnO(2) content with respect to the entire electrode and achieved a maximum specific capacitance of 130 F/g. In addition, we have also explored the excellent electrochemical performance of a symmetrical supercapacitor (of weight less than 10 mg and thickness ~0.8 mm) consisting of a sandwich structure of two pieces of 3D graphene/MnO(2) composite network separated by a membrane and encapsulated in polyethylene terephthalate (PET) membranes. This research might provide a method for flexible, lightweight, high-performance, low-cost, and environmentally friendly materials used in energy conversion and storage systems for the effective use of renewable energy. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/23249211/Freestanding_three_dimensional_graphene/MnO2_composite_networks_as_ultralight_and_flexible_supercapacitor_electrodes_ L2 - https://doi.org/10.1021/nn304833s DB - PRIME DP - Unbound Medicine ER -