Monodispersed Silica@Nickel Silicate Hydroxide Core–Shell Spheres for Supercapacitor Electrodes

Yang, Tao; Lu, Qingshan; Zhao, Shunsheng

doi:10.1002/pssa.201900395

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…The calculated b values of AMFe, AMCo, AMFC, and CHOAMFC are all located between 0.5 (diffusion-controlled) and 1 (capacitive-controlled), illustrating that the reaction currents originate from diffusion-controlled and capacitive-controlled processes . In addition, the response current ( i ) consisting of capacitive controlled effects and diffusion-controlled processes at a specific potential ( V ) can be written as follows i ( V ) = k 1 v + k 2 v 0.5 where i and v represent the current at a fixed voltage and the scan rate, respectively, and k 1 and k 2 are constants. k 1 v and k 2 v 0.5 represent the capacitive-controlled behaviors and diffusion-controlled process, respectively .…”

Section: Resultsmentioning

confidence: 95%

“…k 1 v and k 2 v 0.5 represent the capacitive-controlled behaviors and diffusion-controlled process, respectively. 48 As shown in Figure 6c,d, the capacitive contribution increases from 27 to 62% in CHOAMFC with the increase in scan rates, which was much higher than that in AMFe, AMCo, and AMFC (Figure S7). Although the conductivity and energy storage are improved by preparing AMFC, the electrochemical reaction in which bimetallic ions participate together inevitably produces mutual constraints between the two phases.…”

Section: Ftir Spectroscopy and Xps Analysesmentioning

confidence: 82%

“…In addition, the response current ( i ) consisting of capacitive controlled effects and diffusion-controlled processes at a specific potential ( V ) can be written as follows i ( V ) = k 1 v + k 2 v 0.5 where i and v represent the current at a fixed voltage and the scan rate, respectively, and k 1 and k 2 are constants. k 1 v and k 2 v 0.5 represent the capacitive-controlled behaviors and diffusion-controlled process, respectively . As shown in Figure c,d, the capacitive contribution increases from 27 to 62% in CHOAMFC with the increase in scan rates, which was much higher than that in AMFe, AMCo, and AMFC (Figure S7).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Lamellar Carbon Composited Cobalt Iron Silicate with a Two-Dimensional Structure Toward Enhanced Electrochemical Properties for Supercapacitors

Tian

Dang

Kefeng

et al. 2023

ACS Appl. Energy Mater.

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Transition metal silicates are a potential supercapacitor electrode material due to appreciable theoretical specific capacitance and high energy density. However, the inherent narrow voltage window range and poor conductivity lead to unsatisfactory electrochemical properties. Herein, the carbon composited iron cobalt silicate (denoted as CHOAMFC) with a two-dimensional lamellar structure is designed to enhance the electrical conductivity, where two-dimensional mesoporous silica obtained from montmorillonite was used as the silicon source and template to combine with Fe2+ and Co2+. The CHOAMFC exhibits a specific capacitance of 1008.3 F·g–1 at 0.5 A·g–1 with a long lifespan of 107% after 10 000 cycles. Meanwhile, the assembled hybrid supercapacitor device (CHOAMFC//AC) displays the energy density of 50.9 W h·kg–1 at 275 W·kg–1 as well as excellent cycling stability after 7000 cycles. The great supercapacitor performance is attributed to the uniformly distributed secondary nanosheets on the lamellar substrate that enhance the exposure of sites and the contact with the electrolyte, allowing for easier ion transport. This study explores a strategy of CHOAMFC based on the resource endowment and crystal structure of natural minerals, which provides a feasible idea to obtain two-dimensional layered bimetallic silicate supercapacitor electrode materials with excellent electrochemical performance.

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Section: Resultsmentioning

confidence: 95%

Section: Ftir Spectroscopy and Xps Analysesmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Lamellar Carbon Composited Cobalt Iron Silicate with a Two-Dimensional Structure Toward Enhanced Electrochemical Properties for Supercapacitors

Tian

Dang

Kefeng

et al. 2023

ACS Appl. Energy Mater.

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“…A downward trend of specific capacitance is observed when the current density increases. There are two reasons for this phenomenon at high current density 21,55 : (1) the redox reaction is not thoroughly finished in the internal active sites; (2) the charge adsorption/desorption is not fully complete. As listed in Supporting Information: Table S2, the CoMnSi-2 achieves the largest specific capacitance of 495 F g −1 at 0.5 A g −1 , which is superior to the state-ofthe-art CoSi-based materials applied to SC's electrodes, such as (Ni, Co) 3 Si 2 O 5 (OH) 4 (144 F g −1 at 1 A g −1 ), 33 CoNiSi/C (226 F g −1 at 0.5 A g −1 ), 18 s-rGO/Co 2 SiO 4 (428 F g −1 at 0.5 A g −1 ), 32 Co 2 SiO 4 @MnSiO 3 (309 F g −1 at 0.5 A g −1 ), 40 Co 2 SiO 4 nanobelts (244 F g −1 at 0.5 A g −1 ), 39 C@Co,CoO/Co 2 SiO 4 /rGO (360 F g −1 at 0.5 A g −1 ), 30 and so on.…”

Section: Co Sio + 2ohmentioning

confidence: 99%

Mn‐doping ensuring cobalt silicate hollow spheres with boosted electrochemical property for hybrid supercapacitors

Ding,

Wang,

Wang

et al. 2023

Battery Energy

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Recently, transition metal silicates (TMSs) have garnered significant attention as promising candidates for electrode materials in supercapacitors (SCs), especially cobalt silicate (Co2SiO4, CoSi) related materials. However, due to the poor conductivity and narrow potential range of CoSi, its electrochemical properties are not fully developed and far from desirable. Herein, to enhance the electrochemical properties of CoSi, hollow spheres of Mn‐doped CoSi (CoMnSi) were fabricated through a hydrothermal method. The dopant Mn facilitates the formation of CoMnSi hollow spheres assembled by nanosheets and these nanosheets connect with each other to form the core‐shell hollow architecture. The effect of the Mn/Co ratio on the electrochemical properties of CoSi has been investigated. CoMnSi‐2 (Mn/Co = 1/9) displays the specific capacitance of 495 F g−1 at 0.5 A g−1, surpassing to that of CoSi (279 F g−1 at 0.5 A g−1) and manganese silicate (denoted as MnSi, 38 F g−1 at 0.5 A g−1). The CoMnSi‐2//active carbon hybrid supercapacitor (CoMnSi‐2//AC HSC) achieves the specific capacitance with 181 mF cm−2 (151 F g−1) at 1 mA cm−2 and energy density with 0.644 Wh m−2 at 2 W m−2. The device displays a practical application by powering the LED lamp circuit bulb working for more than 25 min repeatedly. The performance achieved by CoMnSi is superior to some state‐of‐the‐art electrode materials of TMSs. Density functional theory calculations have provided evidence that Mn‐doping enhances the electronic conductivity and reduces the electron transport barrier of CoSi, boosting its electrochemical properties. This work supplies a strategy for tailoring structures of TMSs to enhance their electrochemical performance.

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“…Transition metal silicates (TMSs) possess the above features of high-performance SCs [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Among TMSs, Cobalt-based silicates as electrode materials have received great interest because they can be used as promising electrode materials for batteries, SCs and water splitting owing to their abundance, low cost and stability [ 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Phosphorus-Doped Cobalt Silicate with Improved Electrochemical Properties

Zhao

Zhang

et al. 2021

Molecules

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The development of electrode materials for supercapacitors (SCs) is greatly desired, and this still poses an immense challenge for researchers. Cobalt silicate (Co2SiO4, denoted as CoSi) with a high theoretical capacity is deemed to be one of the sustainable electrode materials for SCs. However, its achieved electrochemical properties are still not satisfying. Herein, the phosphorus (P)-doped cobalt silicate, denoted as PCoSi, is synthesized by a calcining strategy. The PCoSi exhibits 1D nanobelts with a specific surface area of 46 m2∙g−1, and it can significantly improve the electrochemical properties of CoSi. As a supercapacitor’s (SC’s) electrode, the specific capacitance of PCoSi attains 434 F∙g−1 at 0.5 A∙g−1, which is much higher than the value of CoSi (244 F∙g−1 at 0.5 A∙g−1). The synergy between the composition and structure endows PCoSi with attractive electrochemical properties. This work provides a novel strategy to improve the electrochemical performances of transition metal silicates.

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Monodispersed Silica@Nickel Silicate Hydroxide Core–Shell Spheres for Supercapacitor Electrodes

Cited by 8 publications

References 21 publications

Lamellar Carbon Composited Cobalt Iron Silicate with a Two-Dimensional Structure Toward Enhanced Electrochemical Properties for Supercapacitors

Lamellar Carbon Composited Cobalt Iron Silicate with a Two-Dimensional Structure Toward Enhanced Electrochemical Properties for Supercapacitors

Mn‐doping ensuring cobalt silicate hollow spheres with boosted electrochemical property for hybrid supercapacitors

Fabrication of Phosphorus-Doped Cobalt Silicate with Improved Electrochemical Properties

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