Supercapacitor electrode of nano-Co3O4 decorated with gold nanoparticles via in-situ reduction method

Tan, Yongtao; Liu, Ying; Kong, Ling‐Bin; Kang, Long; Ran, Fen

doi:10.1016/j.jpowsour.2017.07.054

Cited by 110 publications

(35 citation statements)

References 57 publications

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“…4f and the obtained Au nanoparticles by in-situ reduction of sodium borohydride had particle size of about 10 nm. Moreover, the HRTEM image of gold nanoparticles showed that the lattice fringe of these gold nanoparticles had an interlayer distance of 0.233 nm, which can be attributed to the (111) crystal plane of metal gold crystals 35,36 and agreed with the XRD analysis of Au-PPCM.…”

Section: Resultssupporting

confidence: 66%

3D hierarchically gold-nanoparticle-decorated porous carbon for high-performance supercapacitors

Chen

Gao

et al. 2019

Sci Rep

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Porous carbon are excellent electrode materials for energy-storage devices. Here, we present a facile in-situ reduction method to improve the electrochemical performance of carbon materials by gold nanoparticles. The prepared porous carbon microspheres decorated with gold-nanoparticle had a 3D honeycomb-like structure with a high specific surface area of about 1635 m2 g−1, confirmed by scanning electron microscopy, transmission electron microscopy, and the Brunauer-Emmett-Teller method. The electrochemical performance of as-synthesized porous carbon microspheres was exemplified as electrode materials for supercapacitor with a high specific capacitance of 440 F g−1 at a current density of 0.5 A g−1, and excellent cycling stability with a capacitance retention of 100% after 2000 cycles at 10 A g−1 in 6 M KOH electrolyte. Our method opened a new direction for the gold-nanoparticle-decorated synthesis of porous carbon microspheres and could be further applied to synthesize porous carbon microspheres with various nanoparticle decorations for numerous applications as energy storage devices, enhanced absorption materials, and catalytical sites.

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Section: Resultssupporting

confidence: 66%

3D hierarchically gold-nanoparticle-decorated porous carbon for high-performance supercapacitors

Chen

Gao

et al. 2019

Sci Rep

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“…The Co 3 O 4 in this paper can meet the need of not only high specific capacitance but also excellent rate capability. In addition, the performance of the Co 3 O 4 is even better than some composites of cobalt oxides [34,42,43]. The superior electrochemical behaviors can first be explained by the stable morphology.…”

Section: Resultsmentioning

confidence: 98%

“…Secondly, the large surface and inner space favors an efficient contact between active material and electrolyte, ensuring a high utilization rate of active material. Thirdly, the interconnected nanoparticles with an increased surface-to-bulk ratio offer more sites for ions to enter and, more importantly, allow facile ion diffusion at a high current density [42]. Finally, the hollow spheres are interconnected with one another, contributing to an even longer ionic diffusion channel [37].…”

Section: Resultsmentioning

confidence: 99%

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

et al. 2019

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In this study, a zeolitic imidazolate framework-67 (ZIF-67) was prepared as a precursor using a facile hydrothermal method. After a calcination reaction in the air, the as-prepared precursor was converted to porous thin-wall hollow Co3O4 with its original frame structure almost preserved. The physical and chemical characterizations of the nanomaterial were analyzed systemically. The electrochemical tests indicate that the obtained Co3O4 possesses large specific capacitances of 988 and 925 F/g at 1 and 20 A/g accompanying an outstanding rate capability (a 93.6% capacitance retention) and retains 96.6% of the specific capacitance, even after 6000 continuous charge/discharge cycles. These excellent properties mark the Co3O4 a promising electrode material for high performance supercapacitors.

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“…The properties of fast charge-discharge rate, better safety feature, high power density, and long-life span make supercapacitors become one of the most promising candidates for traditional energy storage devices. According to storage mechanism, supercapacitors are generally classified into two types, including electric double-layer capacitors (EDLCs) and pseudocapacitors [3]. EDLCs store charge by the way of electrostatic adsorption on the interface of electrode/electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Design of NiO Flakes@CoMoO4 Nanosheets Core-Shell Architecture on Ni Foam for High-Performance Supercapacitors

et al. 2019

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As typical electrode materials for supercapacitors, low specific capacitance and insufficient cycling stability of transition metal oxides (TMOs) are still the problems that need to be solved. Design of core-shell structure is considered as an effective method for preparation of high-performance electrode materials. In this work, NiO flakes@CoMoO 4 nanosheets/Ni foam (NiO flakes@CoMoO 4 NSs/NF) core-shell architecture was constructed by a two-step hydrothermal method. Interestingly, the CoMoO 4 NSs are vertically grown on the surface of NiO flakes, forming a two-dimensional (2D) branched core-shell structure. The porous core-shell architecture has relatively high surface area, effective ions channels, and abundant redox sites, resulting in excellent electrochemical performance. As a positive electrode for supercapacitors, NiO flakes@CoMoO 4 NSs/NF core-shell architecture exhibits excellent capacitive performance in terms of high specific capacitance (1097 F/g at 1 A/g) and outstanding cycling stability (97.5% after 2000 circles). The assembled asymmetric supercapacitor (ASC) of NiO flakes@CoMoO 4 NSs/NF//active carbon (AC)/NF possesses a maximum energy density of 25.8 Wh/kg at power density of 894.7 W/kg. The results demonstrate that NiO flakes@CoMoO 4 NSs/NF electrode displays potential applications in supercapacitors and the design of 2D branched core-shell architecture paves an ideal way to obtain high-performance TMOs electrodes. Electronic supplementary material The online version of this article (10.1186/s11671-019-3054-3) contains supplementary material, which is available to authorized users.

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Supercapacitor electrode of nano-Co3O4 decorated with gold nanoparticles via in-situ reduction method

Cited by 110 publications

References 57 publications

3D hierarchically gold-nanoparticle-decorated porous carbon for high-performance supercapacitors

3D hierarchically gold-nanoparticle-decorated porous carbon for high-performance supercapacitors

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

Design of NiO Flakes@CoMoO4 Nanosheets Core-Shell Architecture on Ni Foam for High-Performance Supercapacitors

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