کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6470120 | 1424104 | 2017 | 9 صفحه PDF | دانلود رایگان |
NiCoAl layered double hydroxides (NiCoAl-LDHs) with different morphology, structure, size and pseudocapacior properties have been prepared by tuning the ratio of metallic elements via a hydrothermal method. The optimized element proportion of 2D NiCo2Al-LDH consisting of hexagonal nanosheets delivers a significantly enhanced specific capacitance 2369.4 F gâ1 at a current density of 1 A gâ1. A circle-like growth mechanism is proposed to explain the formation of the 2D NiCo2Al-LDH structures. Its 2D structure and the synergistic effect of three metallic elements assure its high electrochemical performance. An asymmetric supercapacitor (ASC) based on NiCo2Al-LDH exhibits an ultra-high energy density of 91.0 Wh kgâ1 at a power density of 758.2 W kgâ1 as well as long-term stability (92% of its initial capacitance retention at 8 A gâ1 over 5000 cycles), outperforming most of LDH and metal oxides ASCs.
Journal: Electrochimica Acta - Volume 253, 1 November 2017, Pages 324-332