The development of lithium-ion batteries with simplified assembling steps and fast charge capability is crucial for current battery applications. In this study, we propose a simple in-situ strategy for the construction of high-dispersive cobalt oxide (CoO) nanoneedle arrays, which grow vertically on a copper foam substrate. It is demonstrated that this nanoneedle CoO electrodes provide abundant electrochemical surface area. The resulting CoO arrays directly act as binder-free anodes in lithium-ion batteries with the copper foam functioning as the current collector. The highly-dispersed feature of the nanoneedle arrays enhances the effectiveness of active materials, leading to outstanding rate capability and superior long-term cycling stability. These impressive electrochemical properties are attributed to the highly-dispersed self-standing nanoarrays, the advantages of binder-free constituent, and the high exposed surface area of the copper foam substrate compared to copper foil, which enrich active surface area and facilitate charge transfer. The proposed approach to prepare binder-free lithium-ion battery anodes streamlines the electrode fabrication steps and holds significant promise for the future development of the battery industry. 相似文献
Ultrahigh‐density carbon nanoring arrays on a silicon wafer are achieved by a novel templated solution deposition method. Initially the silica nanodot arrays obtained from a nanoporous thin film are used as a template to direct the surface dewetting of a phenolic precursor, while further curing and calcination of the phenolic precursor, followed by etching of the silica arrays, results in large area carbon nanoring arrays with a diameter as small as 25 nm. This study provides a simple and robust chemical route to fabricate complex nanoring arrays with ultrahigh density of about one terabit per square inch.
This article reviews commercially available instrumentation for inkjet printing of polymer micro‐arrays for combinatorial materials research, and requirements thereof. These include a print head positioning accuracy better than 10 μm and a minimum drop volume of 100 pL. Commercially available instruments that fulfill these requirements can be divided into two categories, depending on whether they receive ink from a reservoir (dispense mode) or through fluid aspiration (pipette mode). Instruments belonging to the first category are restricted to the preparation of polymer blend micro‐arrays. These consist of a few substances mixed in various ratios. The other instruments can be used for the preparation of both micro‐arrays of large numbers of different pure polymer compounds and polymer blend micro‐arrays. Moreover, ways to mix compounds are discussed.