Green Fabrication of Ultrathin Co<sub>3</sub>O<sub>4</sub>Nanosheets from Metal–Organic Framework for Robust High-Rate Supercapacitors

Xiao, Zhenyu; Fan, Lili; Xu, Ben Bin; Zhang, Shanqing; Kang, Wenpei; Kang, Zixi; Lin, Huan; Liu, Xiuping; Zhang, Shiyu; Sun, Daofeng

doi:10.1021/acsami.7b10309

Cited by 119 publications

(51 citation statements)

References 61 publications

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“…For investigating the electrochemical performances of the MOF‐derived Ni 0.7 Co 0.3 (OH) 2 , a three‐electrode system with 6 m KOH aqueous as electrolyte was utilized to obtain the cyclic voltammogram (CV) of all Ni 0.7 Co 0.3 (OH) 2 electrodes, as shown in Figure b and Figure S7 (Supporting Information). The battery‐type behaviors of the Ni 0.7 Co 0.3 (OH) 2 electrodes are clearly indicated in their CVs, and the related redox reactions can be demonstrated as follows according to previous reports

Ni {(normalOH)}_{2} + {OH}^{-} \leftrightarrow NiOOH + {normalH}_{normal2} {O+e}^{-}

Co {(normalOH)}_{normal2} + {OH}^{-} \leftrightarrow CoOOH + {normalH}_{normal2} O + {normale}^{-}

CoOOH + {OH}^{-} \leftrightarrow {CoO}_{2} + {normalH}_{2} O + {normale}^{-}

…”

Section: Resultssupporting

confidence: 73%

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

Zhang

Mei

et al. 2019

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Nickel/cobalt hydroxide is a promising battery‐type electrode material for supercapacitors. However, its low cycle stability hinders further applications. Herein, Ni0.7Co0.3(OH)2 core–shell microspheres exhibiting extreme‐prolonged cycling life are successfully synthesized, employing Ni‐Co‐metal–organic framework (MOF) as the precursor/template and a specific hydrolysis strategy. The Ni‐Co‐MOF and KOH aqueous solution are separated and heated to 120 °C before mixing, rather than mixing before heating. Through this hydrolysis strategy, no MOF residual exists in the product, contributing to close stacking of the hydroxide nanoflakes to generate Ni0.7Co0.3(OH)2 microspheres with a robust core–shell structure. The electrode material exhibits high specific capacity (945 C g−1 at 0.5 A g−1) and unprecedented cycling performance (100% after 10 000 cycles). The fabricated asymmetric supercapacitor delivers an energy density of 40.14 Wh kg−1 at a power density of 400.56 W kg−1 and excellent cycling stability (100% after 20 000 cycles). As far as is known, it is the best cycling performance for pure Ni/Co(OH)2.

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Ni {(normalOH)}_{2} + {OH}^{-} \leftrightarrow NiOOH + {normalH}_{normal2} {O+e}^{-}

Co {(normalOH)}_{normal2} + {OH}^{-} \leftrightarrow CoOOH + {normalH}_{normal2} O + {normale}^{-}

CoOOH + {OH}^{-} \leftrightarrow {CoO}_{2} + {normalH}_{2} O + {normale}^{-}

…”

Section: Resultssupporting

confidence: 73%

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

Zhang

Mei

et al. 2019

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“…In addition, owing to the structural diversity and reactivity, 2D MOFs are easy to be converted into other 2D materials with unique structures or functions, such as metal oxides, carbon materials, via thermal treatment, thus making the sacrificial‐template approaches of the 2D MOFs a promising method to obtain specific electrode architectures. Sun et al reported the synthesis of ultrathin Co 3 O 4 nanosheets via a hydrolysis and calcination process of the MOFs precursors . The fabricated samples retained the pristine porosity structures, further delivering a great electrochemical performance.…”

Section: Architectural Design Of 2d Electrode Materialsmentioning

confidence: 99%

Engineering 2D Architectures toward High‐Performance Micro‐Supercapacitors

et al. 2018

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The rise of micro-supercapacitors is satisfying the demand for power storage in portable devices and wireless gadgets. But the miniaturization of the energy-storage components is significantly limited by their energy density. Electrode materials with adequate electrochemical active surfaces are therefore required for improving performance. 2D materials with ultralarge specific surface areas offer a broad portfolio of the development of high-performance micro-supercapacitors in spite of their several critical drawbacks. An architecture engineering strategy is therefore developed to break these natural limits and maximize the significant advantages of these materials. Based on the approaches of phase transformation, intercalation, surface modification, material hybridization, and hierarchical structuration, 2D architectures with improved conductivity, enlarged specific surface, enhanced redox activity, as well as the unique synergetic effect exhibit great promise in the application of miniaturized supercapacitors with highly enhanced performance. Herein, the architecture engineering of emerging 2D materials beyond graphene toward optimizing the performance of micro-supercapacitors is discussed, in order to promote the application of 2D architectures in miniaturized energy-storage devices.

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“…Formula (1) in Supporting Information 1 is used to obtain the specific capacitance of different electrodes . The specific capacitances of Co 3 O 4 and Co 3 O 4 /CNTs are shown in Figure S3 of Supporting Information 1; Co 3 O 4 /CNTs composite has a higher capacitance than Co 3 O 4 electrode.…”

Section: Resultsmentioning

confidence: 99%

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors

et al. 2019

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Sandwich-like, hetero-structured Co 3 O 4 /CNTs were prepared by a simple hydrothermal and self-assembly process. The CNTs insert into layered Co 3 O 4 sheets and ensure fast electron transfer between the Co 3 O 4 sheets for a faradaic reaction close to the electroactive sites and effectively inhibit the deformation and collapse of the pseudocapacitance material in the cyclic process. The well-ordered complex delivers a specific capaci-tance of 562.22 F⋅g À 1 at a current density of 1 A⋅g À 1 ; and in a three-electrode system with regard to hold 96% of the primitive specific capacitance after 5000 cycles. An asymmetric supercapacitor was assembled with Co 3 O 4 /CNTs as positive electrode and activated carbon (AC) as negative electrode, the device shows a high energy density of 157.5 W⋅h⋅kg À 1 at a power density of 2520 W⋅kg À 1 .

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Green Fabrication of Ultrathin Co₃O₄Nanosheets from Metal–Organic Framework for Robust High-Rate Supercapacitors

Cited by 119 publications

References 61 publications

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

Engineering 2D Architectures toward High‐Performance Micro‐Supercapacitors

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors

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Green Fabrication of Ultrathin Co3O4Nanosheets from Metal–Organic Framework for Robust High-Rate Supercapacitors

Cited by 119 publications

References 61 publications

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

“HOT” Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability

Engineering 2D Architectures toward High‐Performance Micro‐Supercapacitors

Facile Construction of Sandwich‐like Co3O4/CNTs Complex for High‐performance Asymmetric Supercapacitors

Contact Info

Product

Resources

About

Green Fabrication of Ultrathin Co₃O₄Nanosheets from Metal–Organic Framework for Robust High-Rate Supercapacitors

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors