Oxalate-derived NiO@NiAl-layered double hydroxide core-shell material for supercapacitors

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL
Hong-Li Yue, Hong-Yan Zeng, Wei Yan, Chao-Wei Luo, Zi-Feng Tian, Kai-Wen Xu
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引用次数: 0

Abstract

NiO as an appealing electrode material has been used for supercapacitors due to its high theoretical capacity and easy availability, but intrinsically low electrical conductivity and insufficient redox active sites restrict its further applications. In this work, a novel oxalate-derived NiO@NiAl-layered double hydroxide (LDH) with 3D core-shell structure (denoted as NiOOA@LDH) was prepared via hydrothermal calcination method, where the oxalate-derived porous C-doping NiO (NiOOA) grown on nickel foam (NF) was constructed using NiC2O4 as a sacrificial template and carbon source. The deposition of the ultrathin NiAl-LDH nanosheets on the NiOOA was conducive to forming robust adhesion between the core and the shell, which promoted effective electron/ion transfer and structure stability. Benefiting from the unique 3D core-shell structure and complementary compositional features, the NiOOA@LDH gave a high specific charge of 1347.0C g−1 at 1 A g−1, prominent rate performance (68.5 % retention at 15 A g−1) and cycle stability (91.1 % retention at 5 A g−1 after 5000 cycles). Furthermore, the as-assembled NiOOA@LDH//activated carbon (AC) device achieved a high energy density of 45.6 Wh kg−1 at a power density of 557.8 W kg−1 and an outstanding cycle stability (93.1 % retention at 5 A g−1 after 10,000 cycles).

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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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