Interconnected 3 D Network of Graphene‐Oxide Nanosheets Decorated with Carbon Dots for High‐Performance Supercapacitors

Zhao, Xiao Li; Li, Ming; Dong, Hanwu; Liu, Yingliang; Hu, Hang; Yin, Chao; Liang, Yeru; Xiao, Yong; Zheng, Mingtao

doi:10.1002/cssc.201700474

Cited by 76 publications

(45 citation statements)

References 57 publications

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“…[4][5][6] Owing to these excellent properties, CQDs are widely used in medical imaging technology, [7,8] environmentalm onitoring, [9,10] chemical analysis, [11] catalystp reparation, [12,13] and energy development fields. [14,15] At present, there are two main classical routest oo btain CQDs. The "topdown"p hysical or chemical cutting strategy uses large-size carbon-based materials as precursors, such as graphene oxide sheets, carbon nanotubes, carbon fibers, or graphite.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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Sustainable, inexpensive, and environmentally friendly biomass waste can be exploited for large‐scale production of carbon nanomaterials. Here, alkali lignin was employed as a precursor to synthesize carbon quantum dots (CQDs) with bright green fluorescence through a simple one‐pot route. The prepared CQDs had a size of 1.5–3.5 nm, were water‐dispersible, and showed wonderful biocompatibility, in addition to their excellent photoluminescence and electrocatalysis properties. These high‐quality CQDs could be used in a wide range of applications such as metal‐ion detection, cell imaging, and electrocatalysis. The wide range of biomass lignin feedstocks provide a green, low‐cost, and viable strategy for producing high‐quality fluorescent CQDs and enable the conversion of biomass waste into high‐value products that promote sustainable development of the economy and human society.

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Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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“…2a shows that the current density of H-SCs generally increases with the printing time. The CV curves display a little deviation from rectangular shape, which may be explained by the redox reaction of oxygen-containing functional groups in the printed electrodes from the Hink [29,31,35]. The GCD curves in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…It was reported that the labile epoxy and hydroxyl groups can transform to more stable C=O group by heat treatment at 200°C [43][44][45], which may be further reduced at higher temperatures. The high fraction of the C=O groups in annealed H-ink at 200°C may explain the excellent electrochemical performance of H-SCs-200, as it has been reported that the existence of stable oxygencontaining functional groups (C=O) is beneficial to the pseudocapacitance and rate capability [29][30][31].…”

Section: Resultsmentioning

confidence: 96%

“…Tailoring the type and amount of oxygen functional groups is essential to obtain higher capacitance [29][30][31]37]. The rich oxygen-containing functional groups in CQDs or GO platelets, such as carbonyl, hydroxyl, or carboxyl groups, are expected to afford active redox sites to provide pseudocapacitance [38][39][40][41].…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it is expected that CQDs are suitable nano-spacers for GO based ink for inkjet-printing of SC electrodes. Although an inter-connected 3D network of reduced GO (rGO) decorated with CQDs was prepared through a hydrothermal method [31], a stable hybrid ink and the fabrication of SCs by inkjet-printing such an ink are highly desired.…”

Section: Introductionmentioning

confidence: 99%

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Solid-state yet flexible supercapacitors made by inkjet-printing hybrid ink of carbon quantum dots/graphene oxide platelets on paper

Liu

Pan

et al. 2018

Sci. China Mater.

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Paper-based flexible supercapacitors (SCs) show advantages due to the improved adhesion between paper and active materials, the simplified printing process and the lower cost, compared to other substrates such as plastics. Here we report the fabrication of solid-state yet flexible SCs by inkjetprinting a hybrid ink consisting of carbon quantum dots (CQDs) and graphene oxide (GO) platelets, followed by casting of polyvinyl alcohol (PVA)/sulfuric acid (H 2 SO 4 ) gel electrolyte. The SC obtained from 100-time-printing of the hybrid ink shows a specific capacitance of~1.0 mF cm −2 at a scan rate of 100 mV s −1 , which is enhanced by nearly 150%; the whole device including paper substrate, gel electrolyte and active material demonstrates an energy density of 0.078 mW h cm −3 at a power density of 0.28 mW cm −3 . In addition, the excellent mechanical strength of GO platelets ensures the good flexibility and mechanical robustness of the printed SCs, which show a retention of 98% in capacitance after being bended for 1,000 cycles at a bending radius of 7.6 mm. This study demonstrates a promising strategy for the large-scale preparation of low-cost, lightweight, and flexible/wearable energy storage devices based on carbon-based ink and paper substrate.

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Ultramicroporous Carbons Puzzled by Graphene Quantum Dots: Integrated High Gravimetric, Volumetric, and Areal Capacitances for Supercapacitors

Zhang

Zhu

Yan

et al. 2018

Adv Funct Materials

165

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Porous carbons integrated with high gravimetric/volumetric/areal capacitances, especially at high mass loadings (>10 mg cm−2), are important for practical applications in supercapacitors. Here, a strategy is developed for the synthesis of ultramicroporous carbons puzzled by graphene quantum dots as the building units through chemical welding and in situ activation. The resulted carbon has unique ultramicroporous structure (≈0.5 nm) with both high surface area (1730 m2 g−1) and packing density (0.97 g cm−3), providing high gravimetric and volumetric capacitances of 270 F g−1 and 262 F cm−3 at 1 A g−1, respectively. More importantly, such carbon achieves an ultrahigh areal capacitance of 5.70 F cm−2 with a high mass loading of 25 mg cm−2 at 1 A g−1, which is one of the best among the previously reported porous carbons. Furthermore, a two‐electrode supercapacitor exhibits an ultrahigh areal capacitance of 3 F cm−2 at 0.5 A g−1, rapid charge–discharge ability, and long lifespan. This work paves an avenue for developing advanced porous carbons with integrated capacitive performances for supercapacitors.

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Interconnected 3 D Network of Graphene‐Oxide Nanosheets Decorated with Carbon Dots for High‐Performance Supercapacitors

Cited by 76 publications

References 57 publications

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Solid-state yet flexible supercapacitors made by inkjet-printing hybrid ink of carbon quantum dots/graphene oxide platelets on paper

Ultramicroporous Carbons Puzzled by Graphene Quantum Dots: Integrated High Gravimetric, Volumetric, and Areal Capacitances for Supercapacitors

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