Porous honeycomb structures formed from interconnected MnO2 sheets on CNT-coated substrates for flexible all-solid-state supercapacitors

Scientific Reports - Tập 6 Số 1
Wen‐Yin Ko1, You-Feng Chen1, Ke-Ming Lu1, Kuan‐Jiuh Lin1
1Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan

Tóm tắt

AbstractThe use of lightweight and easily-fabricated MnO2/carbon nanotube (CNT)-based flexible networks as binder-free electrodes and a polyvinyl alcohol/H2SO4 electrolyte for the formation of stretchable solid-state supercapacitors was examined. The active electrodes were fabricated from 3D honeycomb porous MnO2 assembled from cross-walled and interconnected sheet-architectural MnO2 on CNT-based plastic substrates (denoted as honeycomb MnO2/CNT textiles).These substrates were fabricated through a simple two-step procedure involving the coating of multi-walled carbon nanotubes (MWCNTs) onto commercial textiles by a dipping-drying process and subsequent electrodeposition of the interconnected MnO2 sheets onto the MWCNT-coated textile. With such unique MnO2 architectures integrated onto CNT flexible films, good performance was achieved with a specific capacitance of 324 F/g at 0.5 A/g. A maximum energy density of 7.2 Wh/kg and a power density as high as 3.3 kW/kg were exhibited by the honeycomb MnO2/CNT network device, which is comparable to the performance of other carbon-based and metal oxide/carbon-based solid-state supercapacitor devices. Specifically, the long-term cycling stability of this material is excellent, with almost no loss of its initial capacitance and good Coulombic efficiency of 82% after 5000 cycles. These impressive results identify these materials as a promising candidate for use in environmentally friendly, low-cost and high-performance flexible energy-storage devices.

Từ khóa


Tài liệu tham khảo

Yuan, L. Y. et al. Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO2 Nanorods Hybrid Structure. ACS Nano 6, 656–661 (2012).

Bao, L. H. & Li, X. D. Towards Textile Energy Storage from Cotton T-Shirts. Adv. Mater. 24, 3246–3252 (2012).

Gwon, H. et al. Flexible energy storage devices based on graphene paper. Energy Environ Sci. 4, 1277–1283 (2011).

Kaempgen, M., Chan, C. K., Ma, J., Cui, Y. & Gruner, G. Printable Thin Film Supercapacitors Using Single-Walled Carbon Nanotubes. Nano Lett. 9, 1872–1876 (2009).

Peng, L. L. et al. Ultrathin Two-Dimensional MnO2/Graphene Hybrid Nanostructures for High-Performance, Flexible Planar Supercapacitors. Nano Lett. 13, 2151–2157 (2013).

Ghodbane, O., Pascal, J. L. & Favier, F. Microstructural Effects on Charge-Storage Properties in MnO2-Based Electrochemical Supercapacitors. ACS Appl. Mater. Interfaces 1, 1130–1139 (2009).

Zhou, J. L. et al. Novel Synthesis of Birnessite-Type MnO2 Nanostructure for Water Treatment and Electrochemical Capacitor. Ind. Eng. Chem. Res. 52, 9586–9593 (2013).

Kundu, M. & Liu, L. F. Direct growth of mesoporous MnO2 nanosheet arrays on nickel foam current collectors for high-performance pseudocapacitors. J. Power Sources 243, 676–681 (2013).

Zhao, L. et al. Honeycomb porous MnO2 nanofibers assembled from radially grown nanosheets for aqueous supercapacitors with high working voltage and energy density. Nano Energy 4, 39–48 (2014).

Hu, L. B. et al. Symmetrical MnO2-Carbon Nanotube-Textile Nanostructures for Wearable Pseudocapacitors with High Mass Loading. ACS Nano 5, 8904–8913 (2011).

Mondal, A. K. et al. Graphene/MnO2 hybrid nanosheets as high performance electrode materials for supercapacitors. Mater. Chem. Phys. 143, 740–746 (2014).

Wang, J. G., Yang, Y., Huang, Z. H. & Kang, F. Y. A high-performance asymmetric supercapacitor based on carbon and carbon-MnO2 nanofiber electrodes. Carbon 61, 190–199 (2013).

Huang, Z. D. et al. Self-assembled reduced graphene oxide/carbon nanotube thin films as electrodes for supercapacitors. J. Mater. Chem. 22, 3591–3599 (2012).

Byon, H. R., Lee, S. W., Chen, S., Hammond, P. T. & Shao-Horn, Y. Thin films of carbon nanotubes and chemically reduced graphenes for electrochemical micro-capacitors. Carbon 49, 457–467 (2011).

An, K. H. et al. Electrochemical properties of high-power supercapacitors using single-walled carbon nanotube electrodes. Adv. Funct. Mater. 11, 387–392 (2001).

Xu, Y. X. et al. Flexible Solid-State Supercapacitors Based on Three-Dimensional Graphene Hydrogel Films. ACS Nano 7, 4042–4049 (2013).

Cai, W., Lai, T., Dai, W. & Ye, J. A facile approach to fabricate flexible all-solid-state supercapacitors based on MnFe2O4/graphene hybrids. J. Power Sources 255, 170–178 (2014).

Li, Z. et al. High-performance solid-state supercapacitors based on graphene-ZnO hybrid nanocomposites. Nanoscale Res. Lett. 8, 473 (2013).

Kang, Y. J., Chung, H., Han, C.-H. & Kim, W. All-solid-state flexible supercapacitors based on papers coated with carbon nanotubes and ionic-liquid-based gel electrolytes. Nanotechnology 23, 065401 (2012)

Yang, P. & Mai, W. Flexible solid-state electrochemical supercapacitors. Nano Energy 8, 274–290 (2014).

Thông tin
Thông tin xuất bản

Scientific Reports

Tập 6 Số 1

Thông tin tác giả