Birnessite-type MnO2 nanosheet arrays with interwoven arrangements on vapor grown carbon fibers as hybrid nanocomposites for pseudocapacitors.

Manganese dioxide nanosheet arrays with interconnected arrangements are easily synthesized on vapor grown carbon fibers (MnO2 NSAs@VCFs) by a simple wet-chemical method at low temperature. The conductive nature of the VCFs serves as a scaffold and easily reduces potassium permanganate species for the formation of hierarchical MnO2 NSAs@VCFs. When utilized as an electroactive material for pseudocapacitors, the sophisticated configuration of the nanocomposite provides an effective electrochemical activity and an electron pathway for higher electrochemical performance in 1 M Na2SO4 aqueous solution. The hierarchical MnO2 NSAs@VCFs exhibit a maximum specific capacitance of 115.3 F g-1 at a current density of 0.5 A g-1 with an excellent cycling stability of 85.6% after 2000 cycles at a current density of 5 A g-1. Such facile and cost-effective fabrication of a metal oxide nanocomposite with improved electrochemical performance allows it to be considered as a promising electroactive material for energy storage devices.

[1]  J. Yu,et al.  Metallic Layered Polyester Fabric Enabled Nickel Selenide Nanostructures as Highly Conductive and Binderless Electrode with Superior Energy Storage Performance , 2017 .

[2]  Ye Zhu,et al.  Porous nitrogen and phosphorus co-doped carbon nanofiber networks for high performance electrical double layer capacitors , 2015 .

[3]  P. Bruce,et al.  Nanostructured materials for advanced energy conversion and storage devices , 2005, Nature materials.

[4]  Yang Li,et al.  Nanoporous Ni(OH)2 thin film on 3D Ultrathin-graphite foam for asymmetric supercapacitor. , 2013, ACS nano.

[5]  Wei Shi,et al.  Facile synthesis of well-ordered manganese oxide nanosheet arrays on carbon cloth for high-performance supercapacitors , 2014 .

[6]  Kwang Man Kim,et al.  Electrochemical properties of MnO2/activated carbon nanotube composite as an electrode material for supercapacitor , 2009 .

[7]  Xiaodong Wu,et al.  Graphene oxide--MnO2 nanocomposites for supercapacitors. , 2010, ACS nano.

[8]  J. Yu,et al.  Self-assembled hierarchical β-cobalt hydroxide nanostructures on conductive textiles by one-step electrochemical deposition , 2014 .

[9]  Li Lu,et al.  Hydrothermal synthesis of MnO2/CNT nanocomposite with a CNT core/porous MnO2 sheath hierarchy architecture for supercapacitors , 2012, Nanoscale Research Letters.

[10]  Peng Wu,et al.  Synthesis and Characterization of Self-Standing and Highly Flexible δ-MnO2@CNTs/CNTs Composite Films for Direct Use of Supercapacitor Electrodes. , 2016, ACS applied materials & interfaces.

[11]  Teng Zhai,et al.  H‐TiO2@MnO2//H‐TiO2@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors , 2013, Advanced materials.

[12]  Jihong Wang,et al.  Overview of current development in electrical energy storage technologies and the application potential in power system operation , 2015 .

[13]  K. Kar,et al.  Hierarchically mesoporous carbon nanopetal based electrodes for flexible supercapacitors with super-long cyclic stability , 2015 .

[14]  Chi-Chang Hu,et al.  Advanced materials for aqueous supercapacitors in the asymmetric design , 2015 .

[15]  Xingbin Yan,et al.  Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles and Reduced Graphene Oxide sheets for the Application in High-Performance Asymmetric Supercapacitor , 2015, Scientific Reports.

[16]  L. Dai,et al.  Carbon nanomaterials for high- performance supercapacitors , 2013 .

[17]  D. Bedrov,et al.  Non-Faradaic Energy Storage by Room Temperature Ionic Liquids in Nanoporous Electrodes. , 2015, ACS nano.

[18]  J. Yu,et al.  Tricobalt tetroxide nanoplate arrays on flexible conductive fabric substrate: Facile synthesis and application for electrochemical supercapacitors , 2015 .

[19]  Jun Wang,et al.  Manganese dioxide core–shell nanowires in situ grown on carbon spheres for supercapacitor application , 2014 .

[20]  T. Takei,et al.  Electrodeposition of exfoliated nanosheet colloid from the partially substituted birnessite and electrochemical property , 2012 .

[21]  S. R. Majid,et al.  RGO-wrapped MnO2 composite electrode for supercapacitor application , 2014 .

[22]  Jiali Liu,et al.  A novel method to prepare nanostructured manganese dioxide and its electrochemical properties as a supercapacitor electrode , 2009 .

[23]  S. Maiti,et al.  Interconnected network of MnO2 nanowires with a "cocoonlike" morphology: redox couple-mediated performance enhancement in symmetric aqueous supercapacitor. , 2014, ACS applied materials & interfaces.

[24]  Xiaodong Li,et al.  Cotton-textile-enabled flexible self-sustaining power packs via roll-to-roll fabrication , 2016, Nature Communications.

[25]  Jian Jiang,et al.  Recent Advances in Metal Oxide‐based Electrode Architecture Design for Electrochemical Energy Storage , 2012, Advanced materials.

[26]  J. Yu,et al.  A facile one-step approach to hierarchically assembled core–shell-like MnO2@MnO2 nanoarchitectures on carbon fibers: An efficient and flexible electrode material to enhance energy storage , 2016, Nano Research.

[27]  Myung-Hyun Ryou,et al.  A comparative investigation of carbon black (Super-P) and vapor-grown carbon fibers (VGCFs) as conductive additives for lithium-ion battery cathodes , 2015 .

[28]  Yeong Hwan Ko,et al.  Hierarchical Ni-Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors. , 2016, Nanoscale.

[29]  K. Krishnamoorthy,et al.  Electrochemical performance of an asymmetric supercapacitor based on graphene and cobalt molybdate electrodes , 2015 .

[30]  E. Oh,et al.  Characteristics of Fe2O3/exfoliated vapor-grown carbon fiber composite as anode material for lithium-ion batteries , 2015, Journal of Applied Electrochemistry.

[31]  Yi Cui,et al.  Enhancing the supercapacitor performance of graphene/MnO2 nanostructured electrodes by conductive wrapping. , 2011, Nano letters.

[32]  Li-zhen Wang,et al.  Polypyrrole/MnO2 composites and their enhanced electrochemical capacitance , 2012 .

[33]  E. Frąckowiak.  Carbon materials for supercapacitor application. , 2007, Physical chemistry chemical physics : PCCP.

[34]  Yuxin Zhang,et al.  Flower-like MnO2 decorated activated multihole carbon as high-performance asymmetric supercapacitor electrodes , 2014 .

[35]  A. Reddy,et al.  Nanocrystalline Metal Oxides Dispersed Multiwalled Carbon Nanotubes as Supercapacitor Electrodes , 2007 .

[36]  J. Yu,et al.  Highly flexible conductive fabrics with hierarchically nanostructured amorphous nickel tungsten tetraoxide for enhanced electrochemical energy storage , 2015, Nano Research.

[37]  Li Li,et al.  Facile Synthesis of MnO2/CNTs Composite for Supercapacitor Electrodes with Long Cycle Stability , 2014 .

[38]  R. Li,et al.  One-pot synthesis of MnO2/graphene/carbon nanotube hybrid by chemical method , 2011 .

[39]  Y. Gogotsi,et al.  Materials for electrochemical capacitors. , 2008, Nature materials.

[40]  Mathieu Toupin,et al.  Charge Storage Mechanism of MnO2 Electrode Used in Aqueous Electrochemical Capacitor , 2004 .

[41]  Lijie Ci,et al.  Synthesis of hybrid nanowire arrays and their application as high power supercapacitor electrodes. , 2008, Chemical communications.

[42]  U. Pal,et al.  Effects of crystallization and dopant concentration on the emission behavior of TiO2:Eu nanophosphors , 2012, Nanoscale Research Letters.