High Performance of N‐Doped Graphene with Bubble‐like Textures for Supercapacitors

Zhang, Shuo; Sui, Lina; Kang, Hongquan; Dong, Hua; Dong, Lifeng; Yu, Liyan

doi:10.1002/smll.201702570

Cited by 62 publications

(44 citation statements)

References 66 publications

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“…The XRD patterns of all the samples were shown in Figure . The diffraction peak at 26° was attributed to NG, which is consistent with previous reports . In CuO/NG_A and CuO/NG_AN, the position of the characteristic peak of NG has not changed, indicating the NG is stable during the synthesis of composites.…”

Section: Resultssupporting

confidence: 90%

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene

et al. 2020

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The carbon dioxide reduction reaction (CO 2 RR) driven by renewable electricity is a promising way to tackle the CO 2 emission woes and recycle use of CO 2 . The synthesis of electrocatalysts with high activity and selectivity for CO 2 RR to ethylene remains a great challenge. Herein, leaf-like CuO nanosheets are fabricated in situ on nitrogen-doped graphene (NG) by using a novel reduction-oxidation-reconstruction process. When used as a catalyst for the CO 2 RR in 0.1 M KHCO 3 , a high faradaic efficiency of approximately 30 % for ethylene with an ultra-high ethylene/methane ratio of 190 was achieved at À 1.3 V vs. the reversible hydrogen electrode. The SEM and TEM images confirm the leaf-like CuO nanosheets display highcurvature structures, while multiple distinguished grain boundaries constructed by CuO(110) and CuO(111) planes are verified by HRTEM. For the first time, we present a facile method to combine the high-curvature structure and the grain boundary to enhance the selectivity of the CO 2 RR to ethylene over a CuO catalyst.

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Section: Resultssupporting

confidence: 90%

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene

et al. 2020

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“…Zhang et al . produced nitrogen doped graphene using nitric acid and a high temperature co-processing method at 500 °C for 4 h in a quartz tube furnace with a high specific surface area (436.7 m 2 g −1 ) and a high specific capacitance (481 F g −1 , 1 A g −1 ) 12 .…”

Section: Introductionmentioning

confidence: 99%

Development of High-Performance Supercapacitor based on a Novel Controllable Green Synthesis for 3D Nitrogen Doped Graphene

Elessawy

Nady

Wazeer

et al. 2019

Sci Rep

108

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3D sponge nitrogen doped graphene (NG) was prepared economically from waste polyethylene-terephthalate (PET) bottles mixed with urea at different temperatures using green approach via a novel one-step method. The effect of temperature and the amount of urea on the formation of NG was investigated. Cyclic voltammetry and impedance spectroscopy measurements, revealed that nitrogen fixation, which affects the structure and morphology of prepared materials improve the charge propagation and ion diffusion. The prepared materials show outstanding performance as a supercapacitor electrode material, with the specific capacitance going up to 405 F g−1 at 1 A g−1. An energy density of 68.1 W h kg−1 and a high maximum power density of 558.5 W kg−1 in 6 M KOH electrolytes were recorded for the optimum sample. The NG samples showed an appropriate cyclic stability with capacitance retention of 87.7% after 5000 cycles at 4 A g−1 with high charge/discharge duration. Thus, the prepared NG herein is considered to be promising, cheap material used in energy storage applications and the method used is cost-effective and environmentally friendly method for mass production of NG in addition to opening up opportunities to process waste materials for a wide range of applications.

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“…Compared with conventional electrical double‐layer capacitors, hybrid supercapacitors (HSCs) have recently attracted significant attention because they have the potential to improve energy density by broadening the operating voltage windows without sacrificing power density and cycle life . Recently, ordered mesoporous carbon, graphene quantum dots, and N‐doped graphene with bubble‐like textures have been successfully synthesized that exhibited a relatively high specific capacitance and an excellent cycling stability. Thus, it is essential to obtain a battery‐type positive electrode for integrating with the aforementioned carbon materials to develop high‐performance HSCs with high energy and power density.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Binary Transition Metal Sulfide Tubes Derived from NiCo‐MOF‐74 for High‐Performance Supercapacitors

Gao

Cui

et al. 2019

Energy Tech

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Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal‐organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo‐O) tubular structures are derived from NiCo‐MOF‐74 via a facile annealing process, and then phosphate (NiCo‐P) and sulfide (NiCo‐S) structures are obtained from NiCo‐O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo‐S with nanosheet structures has the highest specific capacitance of 930.4 F g−1 at a current density of 1 A g−1 and an excellent rate capability with a retention of ≈80% at 10 A g−1. The long‐term cycling performance of NiCo‐S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo‐S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg−1 at a power density of 800 W kg−1. The excellent performance of NiCo‐S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.

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High Performance of N‐Doped Graphene with Bubble‐like Textures for Supercapacitors

Cited by 62 publications

References 66 publications

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene

Development of High-Performance Supercapacitor based on a Novel Controllable Green Synthesis for 3D Nitrogen Doped Graphene

Facile Synthesis of Binary Transition Metal Sulfide Tubes Derived from NiCo‐MOF‐74 for High‐Performance Supercapacitors

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High Performance of N‐Doped Graphene with Bubble‐like Textures for Supercapacitors

Cited by 62 publications

References 66 publications

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO2 Electroreduction to Ethylene

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO2 Electroreduction to Ethylene

Development of High-Performance Supercapacitor based on a Novel Controllable Green Synthesis for 3D Nitrogen Doped Graphene

Facile Synthesis of Binary Transition Metal Sulfide Tubes Derived from NiCo‐MOF‐74 for High‐Performance Supercapacitors

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Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene

Controllable Synthesis of Leaf‐Like CuO Nanosheets for Selective CO₂ Electroreduction to Ethylene