Preparation of Cu2S dendritic, double-comb-like nanostructures by gas-solid reaction method

Preparation of a titanium metal electrode with a nitrogen-doped one-dimensional titanium oxide surface layer for the support of catalysts

A Ti metal electrode with nanostructured titanium oxide that possesses high electrical conductivity, a large specific surface area and the capacity for supporting catalysts was prepared by a simple solution and heat treatment.

Electrochemical analysis of the effect of Cr coating the LiV3O8 cathode in a lithium ion battery with a lithium powder anode

Rechargeable 2032-coin-type cells were produced with Li-powder anodes (i.e., Li-powder electrodes, LPEs) and either Cr-coated lithium trivanadate (Li1+xV3O8, LVO) cathodes or uncoated LVO cathodes. The initial discharge capacity of a cell with an LPE and a Cr-coated LVO cathode (Cellcoated) was 252 mAh g(-1) at a 0.2 C-rate and that of a cell with an LPE and an uncoated LVO cathode (Cellbare) was 223 mAh g(-1). After the 50th cycle, Cellcoated exhibited higher capacity retention (about 89%) than Cellbare (about 78%). Changes in the surface morphology of the Cr-coated LVO cathode were observed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The change in the electrical conductivity of the cell was measured using the impedance analysis. The electrochemical properties of the cells were also evaluated based on the differential capacity curve, voltage profiles, and capacity versus number of cycles.

Large-area aligned branched Cu(2)S nanostructure arrays: room-temperature synthesis and growth mechanism

In this work, an effective approach to synthesize large-area Cu(2)S hierarchical nanotree arrays is presented: Cu nanowire arrays synthesized via template-assisted electrodeposition are used as precursors for the self-growth of branched Cu(2)S nanotree arrays by a gas-solid reaction in H(2)S atmosphere at room temperature. The branched Cu(2)S nanotrees with a high aspect ratio are vertically aligned over the Au film surface, forming a nanoscale 'forest'. Electron microscopy studies reveal that the treelike branched nanostructures are composed of an end-capped tubular Cu(2)S trunk and radially organized Cu(2)S nanorod branches over the trunk. A formation mechanism of the hollow trunk and the nanobranches is proposed on the basis of experimental observations.