All-Solid-State Symmetric Supercapacitor Based on Co3O4 Nanoparticles on Vertically Aligned Graphene.

We have synthesized the hybrid supercapacitor electrode of Co3O4 nanoparticles on vertically aligned graphene nanosheets (VAGNs) supported by carbon fabric. The VAGN served as an excellent backbone together with the carbon fabric, enhancing composites to a high specific capacitance of 3480 F/g, approaching the theoretical value (3560 F/g). A highly flexible all-solid-state symmetric supercapacitor device was fabricated by two pieces of our Co3O4/VAGN/carbon fabric hybrid electrode. The device is suitable for different bending angles and delivers a high capacitance (580 F/g), good cycling ability (86.2% capacitance retention after 20 000 cycles), high energy density (80 Wh/kg), and high power density (20 kW/kg at 27 Wh/kg). These excellent electrochemical performances, as a result of the particular structure of VAGN and the flexibility of the carbon fabric, suggest that these composites have an enormous potential in energy application.

[1]  G. Muralidharan,et al.  Microwave assisted synthesis of Co3O4 nanoparticles for high-performance supercapacitors , 2013 .

[2]  Bin Liu,et al.  Fiber-based flexible all-solid-state asymmetric supercapacitors for integrated photodetecting system. , 2014, Angewandte Chemie.

[3]  E. Lima,et al.  Recycling of cobalt from spent Li-ion batteries as β-Co(OH) 2 and the application of Co 3 O 4 as a pseudocapacitor , 2014 .

[4]  Y. Shao-horn,et al.  Carbon nanotube/manganese oxide ultrathin film electrodes for electrochemical capacitors. , 2010, ACS nano.

[5]  H. Cui,et al.  Vertically-aligned graphene@MnO nanosheets as binder-free high-performance electrochemical pseudocapacitor electrodes , 2013 .

[6]  Yi Xie,et al.  Ultrathin two-dimensional MnO2/graphene hybrid nanostructures for high-performance, flexible planar supercapacitors. , 2013, Nano letters.

[7]  Weiguo Song,et al.  Microfluidic etching for fabrication of flexible and all-solid-state micro supercapacitor based on MnO2 nanoparticles. , 2011, Nanoscale.

[8]  Bei Wang,et al.  HYDROTHERMAL SYNTHESIS AND OPTICAL, MAGNETIC, AND SUPERCAPACITANCE PROPERTIES OF NANOPOROUS COBALT OXIDE NANORODS , 2009 .

[9]  Jun Zhou,et al.  Flexible solid-state supercapacitors based on carbon nanoparticles/MnO2 nanorods hybrid structure. , 2012, ACS nano.

[10]  Zhenxing Zhang,et al.  Freestanding three-dimensional graphene/MnO2 composite networks as ultralight and flexible supercapacitor electrodes. , 2013, ACS nano.

[11]  Songtao Lu,et al.  Flexible asymmetric supercapacitors with high energy and high power density in aqueous electrolytes. , 2013, Nanoscale.

[12]  Meilin Liu,et al.  Nickel-cobalt hydroxide nanosheets coated on NiCo2O4 nanowires grown on carbon fiber paper for high-performance pseudocapacitors. , 2013, Nano letters.

[13]  Xin Wang,et al.  Electrochemical capacitance study on Co3O4 nanowires for super capacitors application , 2011 .

[14]  Candace K. Chan,et al.  Printable thin film supercapacitors using single-walled carbon nanotubes. , 2009, Nano letters.

[15]  Pierre-Louis Taberna,et al.  High capacitance of surface-modified 2D titanium carbide in acidic electrolyte , 2014 .

[16]  Feng Li,et al.  Anchoring Hydrous RuO2 on Graphene Sheets for High‐Performance Electrochemical Capacitors , 2010 .

[17]  Hua-rui Xu,et al.  Biomorphic synthesis of mesoporous Co₃O₄ microtubules and their pseudocapacitive performance. , 2014, ACS applied materials & interfaces.

[18]  Feng Li,et al.  High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors. , 2010, ACS nano.

[19]  Yunlong Zhao,et al.  Synergistic effect of hierarchical nanostructured MoO2/Co(OH)2 with largely enhanced pseudocapacitor cyclability. , 2013, Nano letters.

[20]  Zhiqiang Niu,et al.  All‐Solid‐State Flexible Ultrathin Micro‐Supercapacitors Based on Graphene , 2013, Advanced materials.

[21]  Q. Li,et al.  High performance NiMoO4 nanowires supported on carbon cloth as advanced electrodes for symmetric supercapacitors , 2014 .

[22]  J. Lian,et al.  Graphene-Wrapped Mesoporous Cobalt Oxide Hollow Spheres Anode for High-Rate and Long-Life Lithium Ion Batteries , 2014 .

[23]  Zhong Lin Wang,et al.  Hierarchical network architectures of carbon fiber paper supported cobalt oxide nanonet for high-capacity pseudocapacitors. , 2012, Nano letters.

[24]  X. Lou,et al.  Growth of ultrathin mesoporous Co3O4 nanosheet arrays on Ni foam for high-performance electrochemical capacitors , 2012 .

[25]  Hua Zhang,et al.  Preparation of novel 3D graphene networks for supercapacitor applications. , 2011, Small.

[26]  Yuming Dong,et al.  A facile route to controlled synthesis of Co3O4 nanoparticles and their environmental catalytic properties , 2007 .

[27]  Xiubing Li,et al.  Enhanced electromagnetic wave absorption performances of Co3O4 nanocube/reduced graphene oxide composite , 2014 .

[28]  H. Alshareef,et al.  Substrate dependent self-organization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitance. , 2012, Nano letters.