Facile low-temperature synthesis of hematite quantum dots anchored on a three-dimensional ultra-porous graphene-like framework as advanced anode materials for asymmetric supercapacitors

Li, Yunyong; Zhang, Haiyan; Wang, Shanxing; Lin, Yingxin; Chen, Yiming; Shi, Zhicong; Li, Na; Wang, Wenguang; Guo, Zaiping

doi:10.1039/c6ta02927b

Cited by 38 publications

(26 citation statements)

References 50 publications

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“…Highresolution Pt 4f XPS spectrum (Fig. 5A) shows that the Pt NPs in this catalyst system are in metallic Pt 0 state before heating, with distinctive Pt 4f 7/2 and Pt 4f 5/2 peaks located at 71.4 eV and 74.5 eV, 30,31,35 respectively. Negligible chemical-shi of these two peaks reveals that Pt may interact weakly with Fe 2 O 3 as the presence of PVP may shield their strong metal-support interaction at their interface sites.…”

Section: Resultsmentioning

confidence: 97%

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering

Dai

et al. 2017

RSC Adv.

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Section: Resultsmentioning

confidence: 97%

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering

Dai

et al. 2017

RSC Adv.

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“…As shown in Figure 7 a, HNT/C-1:1.5-Y samples with different carbonization temperature were performed at scan rates of 5 mV/s. A redox peak was not observed in the CV curve, demonstrating the formation of an efficient electric double layer [ 43 ]. As was expected, the largest CV curve integral area of HNT/C-1:1.5-800 is in line with the highest specific capacitance, which is consistent with the GCD measurement ( Figure 6 c,d).…”

Section: Resultsmentioning

confidence: 99%

Preparation and Performance of Porous Carbon Nanocomposite from Renewable Phenolic Resin and Halloysite Nanotube

et al. 2020

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The growing demand for high performance from supercapacitors has inspired the development of porous nanocomposites using renewable and naturally available materials. In this work, a formaldehyde-free phenolic resin using monosaccharide-based furfural was synthesized to act as the carbon precursor. One dimensional halloysite nanotube (HNT) with high porosity and excellent cation/anion exchange capacity was mixed with the phenol-furfural resin to fabricate carbonaceous nanocomposite HNT/C. Their structure and porosity were characterized. The effects of the halloysite nanotube amount and carbonization temperature on the electrochemical properties of HNT/C were explored. HNT/C exhibited rich porosity, involving a large specific surface area 253 m2·g−1 with a total pore volume of 0.27 cm3·g−1. The electrochemical performance of HNT/C was characterized in the three-electrode system and showed enhanced specific capacitance of 146 F·g−1 at 0.2 A g−1 (68 F·g−1 for pristine carbon) in electrolyte (6 mol·L−1 KOH) and a good rate capability of 62% at 3 A g−1. It also displayed excellent cycle performance with capacitance retention of 98.5% after 500 cycles. The symmetric supercapacitors with HNT/C-1:1.5-800 electrodes were fabricated, exhibiting a high energy density of 20.28 Wh·Kg−1 at a power density of 100 W·Kg−1 in 1 M Na2SO4 electrolyte. The present work provides a feasible method for preparing composite electrode materials with a porous structure from renewable phenol-furfural resin and HNT. The excellent supercapacitance highlights the potential applications of HNT/C in energy storage.

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“…Thus, this further confirms the successful preparationo ft he Fe 2 O 3 and GR hybrid. [17][18][19] Moreover,t he selected area electron diffraction (SAED) image displays three clear diffraction rings, attributed to the (113), (110), and (0 12) planes of Fe 2 O 3 ,d emonstrating ap olycrystalline nature (Figure 1e). In addition, the elemental mapping image of Fe 2 O 3 /GR furtherc onfirms the existence of C, Fe, and Oi nt he hybrid ( Figure 1f).…”

Section: Resultsmentioning

confidence: 99%

Advanced Li‐Ion Batteries with High Rate, Stability, and Mass Loading Based on Graphene Ribbon Hybrid Networks

Zhang

Wei

Jiang

et al. 2019

Chemistry A European J

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To optimize the cycle life and rate performance of lithium-ion batteries (LIBs), ultra-fine Fe 2 O 3 nanowires with a diameter of approximately 2nmu niformly anchoredo na cross-linked graphene ribbon network are fabricated. The unique three-dimensional structure can effectively improve the electrical conductivity and facilitate ion diffusion,e specially cross-plane diffusion. Moreover,F e 2 O 3 nanowires on graphene ribbons( Fe 2 O 3 /GR) are easilya ccessible for lithium ions compared with the traditional graphene sheets (Fe 2 O 3 / GS). In addition, the well-developed elastic network can not only undergo the drastic volume expansionduring repetitive cycling, but also protect the bulk electrode from further pulverization. As ar esult,t he Fe 2 O 3 /GR hybrid exhibits high rate and long cycle life Li storagep erformance (632 mAh g À1 at 5Ag À1 ,a nd 471 mAh g À1 capacity maintained even after 3000 cycles). Especially at high mass loading(% 4mgcm À2 ), the Fe 2 O 3 /GR can still deliver higher reversible capacity (223 mAh g À1 even at 2Ag À1 )c ompared with the Fe 2 O 3 /GS (37 mAh g À1 )f or LIBs.Scheme1.Schematicoft he synthesis procedureofF e 2 O 3 nanowires anchored on GR, and the corresponding Li ion transfer pathwaysf or Fe Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Facile low-temperature synthesis of hematite quantum dots anchored on a three-dimensional ultra-porous graphene-like framework as advanced anode materials for asymmetric supercapacitors

Abstract: Hematite quantum dots anchored on a 3D ultraporous graphene-like framework as anode materials showed superior electrochemical performance for asymmetric supercapacitors.

Cited by 38 publications

References 50 publications

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering

Preparation and Performance of Porous Carbon Nanocomposite from Renewable Phenolic Resin and Halloysite Nanotube

Advanced Li‐Ion Batteries with High Rate, Stability, and Mass Loading Based on Graphene Ribbon Hybrid Networks

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Facile low-temperature synthesis of hematite quantum dots anchored on a three-dimensional ultra-porous graphene-like framework as advanced anode materials for asymmetric supercapacitors

Abstract: Hematite quantum dots anchored on a 3D ultraporous graphene-like framework as anode materials showed superior electrochemical performance for asymmetric supercapacitors.

Cited by 38 publications

References 50 publications

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe2O3nanocrystals against sintering

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe2O3nanocrystals against sintering

Preparation and Performance of Porous Carbon Nanocomposite from Renewable Phenolic Resin and Halloysite Nanotube

Advanced Li‐Ion Batteries with High Rate, Stability, and Mass Loading Based on Graphene Ribbon Hybrid Networks

Contact Info

Product

Resources

About

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering

Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe₂O₃nanocrystals against sintering