High-performance nickel-cobalt-boron material for an asymmetric supercapacitor with an ultrahigh energy density

Chen, Rongna; Liu, Lei; Zhou, Jianqiu; Hou, Li; Gao, Faming

doi:10.1016/j.jpowsour.2016.11.108

Cited by 76 publications

(51 citation statements)

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“…Inspired by this, an alternative route of introducing metal compounds into micro‐/nanostructured TMO matrices has been investigated in this research. Cobalt–boride (Co–B), with previously reported exciting electrochemical properties as a catalyst and supercapacitor electrode, was explored to modulate the physicochemical properties of ZnCo 2 O 4 electrodes. Through a facile in situ solution growth of Co–B nanoflakes in ZnCo 2 O 4 (ZCO) micro‐/nanospheres, a compacted ZCO/Co–B hybrid structure was fabricated.…”

Section: Introductionmentioning

confidence: 99%

Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Deng

Qin

et al. 2019

Advanced Energy Materials

127

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and vehicles. [1,2] With the ever-growing demand for the miniaturization of electrochemical energy storage devices, high volumetric lithium storage becomes more and more important. [3,4] Since conventional carbonaceous electrodes have approached the theoretical capacity limits, non-carbon alternatives with higher capacities are urgently required. [5] Transition metal oxides (TMOs) represent one type of promising alternative owing to their high specific capacities based on the conversion reaction mechanism, high abundance as well as high compacted density. [6] However, unlike the intercalation reaction in carbon electrodes, the conversion reaction in TMO anodes causes severe volume fluctuations during charge/discharge processes and thus leads to significant capacity loss. Meanwhile the poor electron conductivity and low Li + diffusivity result in slow reaction kinetics. [7] Taking ternary metal oxide ZnCo 2 O 4 as an example, it delivers a high theoretical capacity of ≈900 mAh g −1 but with a large volume change of ≈100% upon full discharge as well as sluggish lithium storage kinetics. [8,9] To overcome the above hurdles, intensive research has focused on nanoengineering of TMO electrodes, which may offer large free space to cushion the volume expansion and shorten the ion diffusion pathway, therefore enhancing the Transition metal oxides hold great promise as high-energy anodes in nextgeneration lithium-ion batteries. However, owing to the inherent limitations of low electronic/ionic conductivities and dramatic volume change during charge/ discharge, it is still challenging to fabricate practically viable compacted and thick TMO anodes with satisfactory electrochemical performance. Herein, with mesoporous cobalt-boride nanoflakes serving as multifunctional bridges in ZnCo 2 O 4 micro-/nanospheres, a compacted ZnCo 2 O 4 /Co-B hybrid structure is constructed. Co-B nanoflakes not only bridge ZnCo 2 O 4 nanoparticles and function as anchors forZnCo 2 O 4 micro-/nanospheres to suppress the severe volume fluctuation, they also work as effective electron conduction bridges to promote fast electron transportation. More importantly, they serve as Li + transfer bridges to provide significantly boosted Li + diffusivity, evidenced from both experimental kinetics analysis and density functional theory calculations. The mesopores within Co-B nanoflakes help overcome the large Li + diffusion barriers across 2D interfaces. As a result, the ZnCo 2 O 4 /Co-B electrode delivers high gravimetric/ volumetric/areal capacities of 995 mAh g −1 /1450 mAh cm −3 /5.10 mAh cm −2 , respectively, with robust rate capability and long-term cyclability. The distinct interfacial design strategy provides a new direction for designing compacted conversion-type anodes with superior lithium storage kinetics and stability for practical applications. Lithium StorageThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Section: Introductionmentioning

confidence: 99%

Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Deng

Qin

et al. 2019

Advanced Energy Materials

127

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“…[ 38 ] In addition, the characteristic peaks in the region of 640–550 cm −1 could be assigned to the M–B vibration (M = Co, Ni) or M–O vibration. [ 18,39 ]…”

Section: Resultsmentioning

confidence: 99%

Rapid and Controllable Synthesis of Nanocrystallized Nickel‐Cobalt Boride Electrode Materials via a Mircoimpinging Stream Reaction for High Performance Supercapacitors

Zhang

Zhao

et al. 2020

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Nickel-cobalt borides (denoted as NCBs) have been considered as a promising candidate for aqueous supercapacitors due to their high capacitive performances. However, most reported NCBs are amorphous that results in slow electron transfer and even structure collapse during cycling. In this work, a nanocrystallized NCBs-based supercapacitor is successfully designed via a facile and practical microimpinging stream reactor (MISR) technique, composed of a nanocrystallized NCB core to facilitate the charge transfer, and a tightly contacted Ni-Co borates/metaborates (NCB i) shell which is helpful for OH − adsorption. These merits endow NCB@NCB i a large specific capacity of 966 C g −1 (capacitance of 2415 F g −1) at 1 A g −1 and good rate capability (633.2 C g −1 at 30 A g −1), as well as a very high energy density of 74.3 Wh kg −1 in an asymmetric supercapacitor device. More interestingly, it is found that a gradual in situ conversion of core NCBs to nanocrystallized Ni-Co (oxy)-hydroxides inwardly takes place during the cycles, which continuously offers large specific capacity due to more electron transfer in the redox reaction processes. Meanwhile, the electron deficient state of boron in metalborates shells can make it easier to accept electrons and thus promote ionic conduction.

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“…Co-Ni-B/RGO/cotton fabric electrode was prepared based on Meng's report. 11 In detail, Co(NO 3 ) 2 $6H 2 O powders and Ni(NO 3 ) 2 $6H 2 O powders were rstly mixed under vigorous stirring in 100 mL deionized water to obtain uniform dispersion (solution A). Another 25 mmol of NaBH 4 and 5 mmol of NaOH were mixed into 50 mL deionized water for 10 min (solution B).…”

Section: Fabrication Of Amorphous Co-ni-b/rgo/cotton Fabric Electrodementioning

confidence: 99%

“…Therefore, the application of TMBs has been expanded to the energy harnessing eld from luminescence, thermoelectric, and magnetic eld. [11][12][13] For example, the specic capacitance of amorphous Ni-Co-B was measured to be 2226.96 F g À1 with a current density of 1 A g À1 . 12 Amorphous Co-Fe-B showed a good specic capacitance of 981 F g À1 at the current density of 1 A g À1 .…”

Section: Introductionmentioning

confidence: 99%

“…21 As one of the typical TMBs, amorphous Co-Ni-B has demonstrated its tempting pseudocapacitive storage properties. 11 With these favorable features, amorphous Co-Ni-B was coupled with carbon materials to construct a hierarchical structure to impart cotton fabric the nice electrochemical property. Herein, the cotton fabric with a hierarchical 3D porous structure was primarily used as a structural backbone.…”

Section: Introductionmentioning

confidence: 99%

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Facile construction of a flexible and wearable electrode based on the hierarchical structure of RGO-coated cotton fabric with amorphous Co–Ni–B alloy

Wang

Zhang

et al. 2020

RSC Adv.

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High-performance nickel-cobalt-boron material for an asymmetric supercapacitor with an ultrahigh energy density

Cited by 76 publications

References 61 publications

Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Rapid and Controllable Synthesis of Nanocrystallized Nickel‐Cobalt Boride Electrode Materials via a Mircoimpinging Stream Reaction for High Performance Supercapacitors

Facile construction of a flexible and wearable electrode based on the hierarchical structure of RGO-coated cotton fabric with amorphous Co–Ni–B alloy

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High-performance nickel-cobalt-boron material for an asymmetric supercapacitor with an ultrahigh energy density

Cited by 76 publications

References 61 publications

Co–B Nanoflakes as Multifunctional Bridges in ZnCo2O4 Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Co–B Nanoflakes as Multifunctional Bridges in ZnCo2O4 Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Rapid and Controllable Synthesis of Nanocrystallized Nickel‐Cobalt Boride Electrode Materials via a Mircoimpinging Stream Reaction for High Performance Supercapacitors

Facile construction of a flexible and wearable electrode based on the hierarchical structure of RGO-coated cotton fabric with amorphous Co–Ni–B alloy

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Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Co–B Nanoflakes as Multifunctional Bridges in ZnCo₂O₄ Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability