期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 633, 期 -, 页码 723-736出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.11.131
关键词
NiCo LDH; CoO; 3D; 3D structure; Quasi-solid-state supercapacitor
The research on the structure of advanced electrode materials is significant in the field of supercapacitors. A novel 3D/3D composite structure is proposed for the first time, which combines 3D hollow NiCo LDH nanocages with 3D sea urchin-like CoO microspheres. The hybrid structure exhibits excellent electrical conductivity, electrochemical reaction kinetics, and long cycling stability.
The research on the structure of advanced electrode materials is significant in the field of supercapacitors. Herein, for the first time, we propose a novel 3D/3D composite structure by a multi-step process, in which 3D hollow NiCo LDH nanocages are immobilized on 3D sea urchin-like CoO microspheres. Results show that the 3D CoO acts as an efficient and stable channel for ion diffusion, while the hollow NiCo LDH pro -vides abundant redox-active sites. The calculated results based on density function theory (DFT) show that the CoO@NiCo LDH heterostructure has an enhanced density of states (DOS) near the Fermi level and strong adsorption capacity for OH-, indicating its excellent electrical conductivity and electrochem-ical reaction kinetics. As a result, the CoO@NiCo LDH electrode has an areal specific capacity of 4.71C cm-2 at a current density of 3 mA cm-2 (440.19C g-1 at 0.28 A g-1) and can still maintain 88.76 % of the initial capacitance after 5000 cycles. In addition, the assembled hybrid supercapacitor has an energy density of 5.59 mWh cm-3 at 39.54 mW cm-3.(c) 2022 Elsevier Inc. All rights reserved.
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