tailieunhanh - Báo cáo hóa học: " Low-temperature synthesis of CuO-interlaced nanodiscs for lithium ion battery electrodes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Low-temperature synthesis of CuO-interlaced nanodiscs for lithium ion battery electrodes | Seo et al. Nanoscale Research Letters 2011 6 397 http content 6 1 397 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Low-temperature synthesis of CuO-interlaced nanodiscs for lithium ion battery electrodes Seung-Deok Seo Yun-Ho Jin Seung-Hun Lee Hyun-Woo Shim and Dong-Wan Kim Abstract In this study we report the high-yield synthesis of 2-dimensional cupric oxide CuO nanodiscs through dehydrogenation of 1-dimensional Cu OH 2 nanowires at 60 C. Most of the nanodiscs had a diameter of approximately 500 nm and a thickness of approximately 50 nm. After further prolonged reaction times secondary irregular nanodiscs gradually grew vertically into regular nanodiscs. These CuO nanostructures were characterized using X-ray diffraction transmission electron microscopy and Brunauer-Emmett-Teller measurements. The possible growth mechanism of the interlaced disc CuO nanostructures is systematically discussed. The electrochemical performances of the CuO nanodisc electrodes were evaluated in detail using cyclic voltammetry and galvanostatic cycling. Furthermore we demonstrate that the incorporation of multiwalled carbon nanotubes enables the enhanced reversible capacities and capacity retention of CuO nanodisc electrodes on cycling by offering more efficient electron transport paths. Introduction Inexpensive environmentally innocuous and easily producible cupric oxide CuO is an important p-type semiconductor with a bandgap of eV that is widely studied in applications including catalysts gas sensors photoconductive photochemical cells and other electronic devices 1-5 . Additionally a great effort has recently been applied to the nanostructuring of CuO as it can deliver much higher reversible capacities than commercial graphite-based electrodes through the conversion reaction with Li CuO 2e- 2Li Cu0 Li2O . Thus various CuO nanostructures nanoparticles nanowires nanorods nanotubes have been shown to be good candidates as .