|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|157830||2017||32 صفحه PDF||سفارش دهید|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Electrochimica Acta, Volume 247, 1 September 2017, Pages 745-753
Architecturally assembling primary building blocks into the expected geometric heterostructure is a tremendous challenge due to the interfaces dislocation and stretch resulting from the lattice-mismatch between heterogeneous building blocks. Although different dimensional nanomaterials have been synthesized, the branched acanthosphere-like hierarchical architecture is needed to be developed and the growth mechanism should be investigated. Here we design and fabricate an acanthosphere-like NiCo2O4@Î±-MnO2 heterostructures architecture by an âin situ growthâ technique of two-steps hydrothermal method. The as-prepared acanthosphere-like NiCo2O4@Î±-MnO2 microspheres (denoted as AM-NCM) have a diameter of 5Â â¼Â 7 um with a highly open and interstitial three dimensional (3D) architecture formed by Î±-MnO2 ultrathin nanosheets leading to faster ion diffusion and improved charge transfer kinetics. Therefore, the hybrid electrodes exhibits exceptional specific capacitances of 695Â FÂ gâ1 (2.17Â FÂ cmâ2) at the current densities of 3.2Â AÂ gâ1 (10Â mAÂ cmâ2) and good cycling electrochemical stability with only 2.4% capacitance loss after 1000 cycles and still maintains 92% of its initial value after 6000 cycles. The outstanding performance of the branched AM-NCM reveals its potential to be a promising material for energy storage, and also inspires continued research on the formation of branched hierarchical architecture as energy storage materials.