NaV 6 O 15 nanoplates are successfully prepared by a facile and low-cost self-combustion method, which can be considered as promising cathode materials for high capacity sodium-ion batteries (NIBs). Morphology analysis suggests that the self-combustion method leads to the NaV 6 O 15 nanoplates possessing uniform size, with an average length of 400 nm and width of 100 nm. As the cathode materials, the NaV 6 O 15 nanoplates exhibit a high initial discharge specific capacity of 149.48 mAh g −1 at a current density of 20 mA g −1 and remains 81.99 mAh g −1 after 30 cycles. The volume change is as little as 6.4%, which is demonstrated by the first-principles calculation. To understand the diffusion performance of sodium ion in NaV 6 O 15 crystalline lattice, the diffusion coefficients of sodium ion are investigated by the electrochemical impedance spectroscopy (EIS) method and the first-principles calculation. The vacancy-hopping diffusion mechanism is proposed based on a quasi-2D energy favorable trajectory, which relieves the sodium ions diffuse along b-axis in NaV 6 O 15 lattice with desirable activation energy of 0.481 eV.

All inorganic carbon-based planar perovskites, particularly CsPbBr3, have attracted considerable attention due to their excellent stability against oxygen, moisture, and heat for photovoltaic utilization.

Geometrical structures of (ZnSe) n , n ¼ 3x, (x ¼ 1-4) and (Mn x Zn 2x Se 3x Þ, (x ¼ 1À4Þ clusters were calculated using density functional theory (DFT). Optical/absorption spectra, Raman spectra, HOMO-LUMO gap energy and binding energy of each cluster were calculated. The calculated results show the red shift of the optical/absorption spectra band caused by the manganese atoms doped in ZnSe clusters, and the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap energy value is decreased. Furthermore, we realized highly monodispersed manganese-doped zinc selenide quantum dots (Mn:ZnSe d-dots) experimentally by using a convenient route. The as-synthesized Mn:ZnSe d-dots were characterized by UV-Vis absorption, photoluminescence (PL), X-ray di®raction (XRD), TEM and HRTEM. The experimental results revealed that the as-prepared Mn:ZnSe d-dots with zincblende structure have an average size of about 3.9 nm.

Environment-friendly CuInZnS (CIZS) core and CuInZnS/ZnS (CIZS/ZnS) core/shell quantum dots (QDs) were synthesized via a facile solution-phase method. Different methods certified that the ZnS shell was successfully coated on CIZS core. The coating of ZnS shell would lead to the quantum yield increase and optical spectra blue shifted. Furthermore, the CIZS and CIZS/ZnS had a long PL lifetime of 257.3[Formula: see text]ns and 411.6[Formula: see text]ns, respectively. Finally, the CIZS/ZnS QDs powder with yellow emission was used to compose white light emitting diodes (WLED) on blue LED chip. The WLED had a [Formula: see text] of 80, [Formula: see text] of 4793[Formula: see text]K, and CIE coordinates of (0.346, 0.321) under 20[Formula: see text]mA current, and had a bright warm white emission, which indicated the promising potential of the CIZS/ZnS QDs in the optoelectronics.