Porous Graphitic Carbon Nanosheets Derived from Cornstalk Biomass for Advanced Supercapacitors

Wang, Lei; Mu, Guang; Tian, Chungui; Sun, Lu; Zhou, Wei; Yu, Peng; Yin, Jie; Fu, Honggang

doi:10.1002/cssc.201200990

Cited by 269 publications

(137 citation statements)

References 54 publications

(79 reference statements)

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“…The diameter of the semicircle in the medium frequency region of the PGS-2-1000 is considerably smaller than that of EG, indicating a lower charge-transfer resistance of the PGS-2-1000 electrode, which is attributed to the easy accessibility and transportation of the electrolyte in the loose, packed, and porous nanosheet structures. The PGS-2-1000 anode exhibits a substantially better Li storage performance than that reported in previous studies and obtained by using expandable graphite, natural graphite, and graphene as LIB anodes [70][71][72]. The excellent conductivity of PGS-2-1000 can generate excellent high-rate performance and superior cycle lifetime.…”

Section: Resultsmentioning

confidence: 60%

From graphite to porous graphene-like nanosheets for high rate lithium-ion batteries

Zhao

Wang

et al. 2015

Nano Res.

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Graphene nanosheets possess a promising potential as electrodes in Li-ion batteries (LIBs); consequently, the development of low-cost and high-productivity synthetic approaches is crucial. Herein, porous graphene-like nanosheets (PGSs) have been synthesized from expandable graphite (EG) by initially intercalating phosphoric acid, and then performing annealing to enlarge the interlayer distance of EG, thus facilitating the successive intercalation of zinc chloride. Subsequently, the following pyrolysis of zinc chloride in the EG interlayer promoted the formation of the porous PGS structure; meanwhile, the gas produced during the formation of the porous structure could exfoliate the EG to graphene-like nanosheets. The synthetic PGS material used as LIB anode exhibited superior Li + storage performance, showing a remarkable discharge capacity of 830.4 mAh·g −1 at 100 mA·g −1 , excellent rate capacity of 211.6 mAh·g −1 at 20,000 mA·g −1 , and excellent cycle performance (near 100% capacity retention after 10,000 cycles). The excellent rate performance is attributed to the Li + ion rapid transport in porous structures and the high electrical conductivity of graphene-like nanosheets. It is expected that PGS may be widely used as anode material for high-rate LIBs via this facile and low-cost route by employing EG as the raw material.

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Section: Resultsmentioning

confidence: 60%

From graphite to porous graphene-like nanosheets for high rate lithium-ion batteries

Zhao

Wang

et al. 2015

Nano Res.

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“…The diffraction peaks at 26.2°, 42.2°, 54.0° and 77.2° are the characteristics of the graphite (002), (100), (004) and (110) planes, respectively, implying the formation of graphitic carbon42. Raman is a powerful spectroscopic technique for characterizing carbon materials.…”

Section: Resultsmentioning

confidence: 99%

B and N isolate-doped graphitic carbon nanosheets from nitrogen-containing ion-exchanged resins for enhanced oxygen reduction

Wang

Zhao

et al. 2014

Sci Rep

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B,N-codoped carbon nanostructures (BNCS) can serve as alternative low-cost metal-free electrocatalysts for oxygen reduction reactions (ORR). However, the compensation effect between the p- (B atoms) and n-type (N atoms) dopants would make the covalent boron-nitride (BN) easily formed during the synthesis of BNCS, leading to a unsatisfactory ORR activity. Therefore, it has been challenging to develop facile and rapid synthetic strategies for highly active BNCS without forming the direct covalent BN. Here, a facile method is developed to prepare B and N isolate-doped graphitic nanosheets (BNGS) by using iron species for saving N element and simultaneous doping the B element from nitrogen-containing ion-exchanged resins (NR). The resulting BNGS exhibits much more onset potential (Eonset) compared with the B-doped graphitic carbon nanosheets (BGS), N-doped graphitic carbon nanosheets (NGS), as well as B,N-codoped disorder carbon (BNC). Moreover, the BNGS shows well methanol tolerance propery and excellent stability (a minimal loss of activity after 5,000 potential cycles) compared to that of commercial Pt/C catalyst. The goog performance for BNGS towards ORR is attributed to the synergistic effect between B and N, and the well electrons transport property of graphitic carbon in BNGS.

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“…However, manufacturing these 2D carbonaceous materials is a complex process and requires high-cost feedstock. Currently, some 2D graphene-like carbon nanosheets have been prepared using eco-friendly and low-cost methods from waste biomass, such as silk [8], shrimp shells [11], hemp [4], gelatin [21], cornstalk [22] and coffee grounds [9]. These sustainable carbon nanosheets have thin thickness of less than 30 nm and high specific surface areas, which can potentially substitute the graphene for supercapacitor electrodes used.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Tian

Gao

Tan

et al. 2017

Carbon

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A type of unusual interconnected graphitized carbon nanosheets (GCNS) was fabricated from biomass waste, i.e., inner shaddock skins using a facile combined method of simultaneous carbonization-activation and post-vacuum-annealing processes. The obtained GCNS has an optimized integration of a cage-like high-aspect-ratio nanosheet structure (~8 nm thickness), a large surface area of 2327 m 2 g -1 and hierarchical meso/micropore systems (82.3% mesopore volume).Given the effect of post-vacuum-annealing process, enhanced graphitization degree and excellent electronic conductivity (7.9 S cm -1 ) were obtained for the GCNS. The enhanced graphitization degree not only effectively improves electronic/ionic-transport kinetics in favor of rate capability but also prevents electrolyte degradation thus benefitting cyclic life. The ionic liquid-based supercapacitors assembled with symmetric GCNS electrodes exhibited an ultrahigh rate capability of 87% at current density of 100 A g -1 (holding 132 F g −1 ) and a long cyclic life of 97.6% capacitance retention after 10,000 cycles. The excellent rate capability resulted in an integrated high energy-power property at an energy density of 56 Wh kg -1 (29.2 Wh L -1 ), corresponding to a power density of 93 kW kg -1 (48.4 kW L -1 ).

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Porous Graphitic Carbon Nanosheets Derived from Cornstalk Biomass for Advanced Supercapacitors

Cited by 269 publications

References 54 publications

From graphite to porous graphene-like nanosheets for high rate lithium-ion batteries

From graphite to porous graphene-like nanosheets for high rate lithium-ion batteries

B and N isolate-doped graphitic carbon nanosheets from nitrogen-containing ion-exchanged resins for enhanced oxygen reduction

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

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