The performance of synergetic hybrid aerogel materials of vanadia and graphene as electrode materials in supercapacitors was evaluated. The hybrid materials were synthesized by two methods. In Method I, premade graphene oxide (GO) hydrogel was first chemically reduced by L-ascorbic acid and then soaked in vanadium triisopropoxide solution to obtain V2O5 gel in the pores of the reduced graphene ...

Hierarchical 3D TiO2@Fe2O3 nanoframework arrays grown on a Ti substrate are synthesized via a facile hydrothermal reaction. As the synergetic effect of this hybrid material, the TiO2@Fe2O3 electrode shows superior rate capability and cycling performance to bare TiO2 and Fe2O3 electrodes.

This contribution is concerned with the control parameters for arriving at defined, electrochemically relevant materials. The treatment is precise as far as the equilibrium situation of simple crystals is concerned, but becomes more and more qualitative if the distance from equilibrium or the (structural or compositional) complexity increases. It proves useful to distinguish between in situ par...

Assembly of electrochemically active materials into paper-based electrodes opens up new opportunities for flexible energy storage devices. Yat Li and co-workers review the recent advances in the synthesis of paper-based electrodes, including paper-supported electrodes and paper-like electrodes in article 1700107. Their structural features, electrochemical performances and implementation as elec...

The tetrode, a bundle of four electrodes, has proven to be a valuable tool for the simultaneous recording of multiple neurons in-vivo. The differential amplitude of action potential signatures over the channels of a tetrode allows for the isolation of single-unit activity from multi-unit signals. The ability to precisely control the stereotaxic location and depth of the tetrode is critical for ...

Quantitative description of charge transport across tunneling and break-junction devices with novel superconductors encounters some problems not present or not as severe for traditional superconducting materials. In this work, we explain unexpected features in related transport characteristics as an effect of a degraded nanoscaled sheath at the superconductor surface. A model capturing the main...

Effectively controlling quantum mechanical tunneling through an ultrathin dielectric represents a fundamental materials challenge in the quest for high-performance metal-insulatormetal (MIM) diodes. Such diodes are the basis for alternative approaches to conventional thin-fi lm transistor technologies for large-area information displays, [ 1 , 2 ] various types of hot electron transistors, [ 2–...

Advanced energy-storage systems are critically important for meeting the ever-increasing demand for applications from portable electronics to all-electric vehicles, and recently for applications in the grid for storing energy from fluctuating renewable sources, such as wind or solar energy. Lithium-ion batteries (LIBs) have received worldwide attention as a top performing energy-storage system....

http://dx.doi.org/10.1016/j.pmatsci.2017.04.014 0079-6425/ 2017 Elsevier Ltd. All rights reserved. ⇑ Corresponding authors at: Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA (S Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Ca MA 02139, USA (...

Graphene is composed of a single atomic layer of carbon which has excellent mechanical, electrical and optical properties. It has the potential to be widely used in the fields of physics, chemistry, information, energy and device manufacturing. In this paper, we briefly review the concept, structure, properties, preparation methods of graphene and its application in lithium ion batteries. A con...