The excellent electrochemical performance is mainly ascribed to the unique hierarchical structure of Cu making it attractive as a potential electrode material for high performance SCs. The asymmetric supercapacitor device using Cu as the positive electrode and activated carbon as the negative electrode, achieves a superior energy density up to 60.26 Wh kg −1 at a power density of 299.73 W kg −1 and an excellent long-term cycling stability (9.65% loss of its initial capacitance after 5,000 cycles). The composite electrode exhibits high specific capacitance. CCs coated with Cu, as the current collector, can effectively promote the charge collection and electron transfer, while the hierarchical Cu 2O/CuO nanosheets provide massive active sites for fast faradic reactions. The as-prepared material is directly used as binder-free electrodes for supercapacitors (SCs). 2Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, ChinaĬu 2O/CuO nanosheets in-situ grown on Cu-Carbon cloths (Cu-CCs), namely Cu are constructed by a simple strategy with electroless copper plating, chemical etching, and thermal dehydration.1School of Materials Science and Engineering, Shandong University of Technology, Zibo, China.For CuO, we compare the obtained primary excitation spectra with first principle calculations performed with the CTM4XAS software (Charge Transfer Multiplet program for X-ray Absorption Spectroscopy) for the corresponding emissions and we find good quantitative agreement.Lina Xu 1, Jiao Li 1 *, Haibin Sun 1 *, Xue Guo 1, Jiakun Xu 2, Hua Zhang 1 and Xiaojiao Zhang 1 These calculations were performed for Cu 2p peaks of Cu, Cu 2O, and CuO. The shape of this primary excitation spectrum is determined by requiring close agreement between the resulting theoretical spectrum and the experimental XPS spectrum. lifetime broadening, spin–orbit coupling, and multiplet splitting. The full XPS spectrum is then modeled by convoluting this energy loss cross section with the primary excitation spectrum that accounts for all effects which are part of the initial photo-excitation process, i.e. We have calculated the effective energy-differential inelastic electron scattering cross section for XPS, including both surface and core hole effects, within the dielectric response theory by means of the QUEELS-XPS software (QUantitative analysis of Electron Energy Losses at Surfaces for XPS). These effects must be included in the theoretical description of the emitted photoelectron spectra. The shape and intensity of photoelectron peaks are strongly affected by extrinsic excitations due to electron transport out of the surface (including bulk and surface effects) and to intrinsic excitations due to the sudden creation of the static core hole.
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