首页|Chinese knot-like bimetallic NiCo2S4 grew on 3D graphene foam as high-performance electrode for Na+ storage
Chinese knot-like bimetallic NiCo2S4 grew on 3D graphene foam as high-performance electrode for Na+ storage
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NSTL
Elsevier
Bimetallic NixCo3?xS4 (x = 1 or 2) with synergistic effect is a promising candidate material for sodium-ion battery (SIB) anodes because of its higher electrical conductivity than monometallic sulfides owing to its lower bandgap. In this study, samples of bimetallic sulfide NixCo3?xS4 with tunable chemical Ni/Co components are successfully grown on graphene foam (GF), forming free-standing Chinese knot-like nanowires (NiCo2S4 NWs/GF) and Chinese lantern-like nanoarrays (CoNi2S4 NAs/GF). When evaluate as anodes for SIBs at 0.3–3.0 V in ether-based electrolytes, the NiCo2S4 NWs/GF electrodes offer superior rate performance and cycling stability than the CoNi2S4 NAs/GF electrodes. More specifically, the NiCo2S4 NWs/GF electrode has a high capacity of 650–556 mAh g?1 at 0.1–2.0 A g?1 and 457 mAh g?1 after 200 cycles at 0.5 A g?1 with a high initial coulombic efficiency (ICE) of 95.6%. And its rate performance outperforms most existing electrodes those contain NiSx, CoSx, or NiCo2S4. The excellent electrochemical performance of the NiCo2S4 NWs/GF electrode is attributed to its unique composition, smaller size, and porous nanowires that can reduce the diffusion length of e- and Na+, and enhance reaction kinetics.
The Faculty of Printing Packaging Engineering and Digital Media Technology Xi'an University of Technology
Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University
MOE Key Laboratory of Space Applied Physics and Chemistry Shaanxi Key Laboratory of Macromolecular Science and Technology College of Chemistry and Chemical Engineering Northwestern Polytechnical University
School of Chemical and Environmental Engineering Harbin University of Science and Technology
NSTL
Elsevier
