Hierarchically structured spherical nickel cobalt layered double hydroxides particles grown on biomass porous carbon as an advanced electrode for high specific energy asymmetric supercapacitor

Ouyang, Yinhui; Xing, Ting; Chen, Yulian; Zheng, Liping; Peng, Junsong; Wu, Chun; Chang, Baobao; Luo, Zhigao; Wang, Xianyou

doi:10.1016/j.est.2020.101454

Cited by 61 publications

(26 citation statements)

References 49 publications

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“…They found that the Ni/Co ratio of 2 achieved the best overall performance, i.e., a pseudocapacitance = 1210 F g −1 at 0.5 A g −1 , rate capability = 83.8% (1014 F g −1 at 10 A g −1 ), 5% capacity loss after 3000 charge-discharge cycles and a maximum energy density of 28.1 Wh kg −1 at 753 W kg −1 assembled in an asymmetric capacitor with activated carbon as negative electrode. Ouyang et al [115] synthesized, via solvothermal reaction spherical, Ni-Co layered double hydroxide nanoparticles on a biocarbon support previously obtained from dry carbonization and KOH activation of water caltrop (Figure 6b). As in the previous case, the Ni/Co ratio of 2 was revealed as the more suitable to obtain highly active material electrode for supercapacitors.…”

Section: Ultrasonic Dispersion Inmentioning

confidence: 99%

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

et al. 2022

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Biochar (BCH) is a carbon-based bio-material produced from thermochemical conversion of biomass. Several activation or functionalization methods are usually used to improve physicochemical and functional properties of BCHs. In the context of green and sustainable future development, activated and functionalized biochars with abundant surface functional groups and large surface area can act as effective catalysts or catalyst supports for chemical transformation of a range of bioproducts in biorefineries. Above the well-known BCH applications, their use as adsorbents to remove pollutants are the mostly discussed, although their potential as catalysts or catalyst supports for advanced (electro)catalytic processes has not been comprehensively explored. In this review, the production/activation/functionalization of metal-supported biochar (M-BCH) are scrutinized, giving special emphasis to the metal-functionalized biochar-based (electro)catalysts as promising catalysts for bioenergy and bioproducts production. Their performance in the fields of biorefinery processes, and energy storage and conversion as electrode materials for oxygen and hydrogen evolutions, oxygen reduction, and supercapacitors, are also reviewed and discussed.

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Section: Ultrasonic Dispersion Inmentioning

confidence: 99%

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

et al. 2022

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“…When active material was grown on the surface of substrate, it would form a layered three-dimensional structure which could ensure the full contact between electrolyte ion and active material, and improve the reaction efficiency. Based on this, Ouyang et al [28] obtained a high specific capacitance of 2047 F g −1 at a current density of 1 A g −1 by fabricating hierarchically structured spherical nickel-cobalt layered double hydroxides particles grown on biomass porous carbon. Zha et al [29] successfully designed and fabricated highly open nickel-cobalt sulfide nanosheets on Ni foam, which presented low resistance and high specific capacitance of 2553.9 F g −1 under a current density of 0.5 A g −1 .…”

Section: Introductionmentioning

confidence: 98%

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

et al. 2021

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Layered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to regulate the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility, adjust the thickness and optimize the internal pore structures of NiCo-LDHs, thereby enhancing their capacitance performance. When the content of urea is reduced from 0.03 to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheet structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g−1 under the current density of 1 A g−1 and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g−1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g−1 at 1 A g−1 with the capacitance retention of 78% over 1000 cycles. The current work offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

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“…LDHs belong to a kind of new layered material, and the general formula is [M 1– x 2+ M 3+ x (OH) 2 ] x + [A n – ] x / n · m H 2 O (M 2+ and M 3+ are the divalent and trivalent metal cations, respectively, and A n – is the interlayer anion). , Actually, LDHs have been diffusely applied in the domains of separation, catalysis, and electrochemistry considering their high controllability and two-dimensional layered structure. Among a family of LDH materials, nickel cobalt hydroxides (NiCo-OH) have become a research hotspot owing to their high specific capacitance and adjustable structure …”

Section: Introductionmentioning

confidence: 99%

Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

Chen

Ouyang

Yang

et al. 2021

ACS Appl. Energy Mater.

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Layered double hydroxides (LDHs) are widely studied as electrode materials of supercapacitors (SCs) owing to their specific composition and morphology and plentiful electrochemically active sites. Especially, nickel cobalt hydroxides can achieve an outstanding electrochemical performance as electrode materials of SCs because of the synergy effect between Ni and Co. Herein, ternary LDHs including Ni, Co, and Al (NiCo2Al x -LDHs) with different stoichiometric ratios are synthesized by a facile method to further research the influences of Al on the morphology and electrochemical performances of LDHs. Results show that the NiCo2Al0.5-LDHs electrode delivers a high specific capacitance (1260 F g–1 at 0.5 A g–1) and an excellent capacitance retention (81.5% of initial capacitance). Besides, an asymmetric supercapacitor (ASC) assembled with a NiCo2Al0.5-LDHs cathode and an activated carbon (AC) anode (NiCo2Al0.5-LDHs//AC ASC) exhibits a high energy density of 39 Wh kg–1 with remarkable cycling stability (91.7% of initial capacitance retention after 6000 cycles at 5 A g–1).

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Hierarchically structured spherical nickel cobalt layered double hydroxides particles grown on biomass porous carbon as an advanced electrode for high specific energy asymmetric supercapacitor

Cited by 61 publications

References 49 publications

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

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