Three dimensional cellular architecture of sulfur doped graphene: self-standing electrode for flexible supercapacitors, lithium ion and sodium ion batteries

Islam, Md. Monirul; Subramaniyam, Chandrasekar Mayandi; Akhter, Taslima; Faisal, Shaikh Nayeem; Minett, Andrew I.; Liu, Huan; Konstantinov, Konstantin; Dou, Shi Xue

doi:10.1039/c6ta10933k

Cited by 124 publications

(55 citation statements)

References 65 publications

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“…The valence states and compositions of pure LTO, CT‐rGO@LTO, and CM‐rGO@LTO were investigated by XPS measurement (Figure S12, Supporting Information). The S2p spectra of the CT‐rGO@LTO ( Figure a) and CM‐rGO@LTO (Figure S13, Supporting Information) samples can be deconvoluted into three components at binding energies of 163.8, 165.0 (CS x C), and 169.7 eV (CSO x C), respectively . The CS x C peak at 163.8 eV can be attributed to the covalent bond of the thiophene‐S, indicating the effective atomic hybridization of sulfur into the rGO lattice under the hydrothermal and thermal treatment processes.…”

Section: Resultsmentioning

confidence: 99%

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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Rational design of nanostructured electrode materials is highly desired for developing high‐performance lithium‐ion batteries (LIBs). Encapsulating electrode materials in reduced graphene oxide (rGO) shows great potential for manipulation of physicochemical properties at the atomic level, promoting remarkable electrochemical properties. Here, a controllable strategy is proposed to synthesize a “pomegranate‐like” 3D rGO encapsulated lithium titanate composite (CT‐rGO@LTO). The experimental results demonstrate the enriched oxygen vacancies in LTO and the electronic interactions at the interface between LTO and rGO. Density functional theory (DFT) calculations confirm the charge redistribution in the CT‐rGO@LTO composite, establishing a strong electric field with oxygen vacancies. Furthermore, the extra active sites in rGO for Li‐ion storage are investigated via in situ Raman tests. Benefiting from the oxygen vacancies and the electric‐field effect, the CT‐rGO@LTO electrode delivers excellent cycling stability with a capacity retention of 87.1% after 1500 cycles at 5 C. Moreover, the CT‐rGO@LTO electrode is adopted to assemble a full cell with a LiCoO2 cathode, which also displays superior rate capability with capacities of 139.4 and 109.7 mA h g−1 at 0.5 and 10 C, respectively. This work provides profound insights of fabricating high‐performance electrode materials for advanced energy storage.

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Section: Resultsmentioning

confidence: 99%

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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“…The reversible capacities reached up to 1043 mAh g −1 for N‐doped rGO and 1549 mAh g −1 for B‐doped rGO in the first cycle at current rate of 50 mA g −1 , which were much superior to those of undoped graphene electrodes. Besides, the phosphorus‐doped rGO or sulfur‐doped rGO also exhibited significant improvements in lithium storage capacity. It is worth noting that pristine porous rGO displays good lithium storage capacity and the doped effect urges rGO films to possess better capacity and higher rate performance due to the increase of defect density.…”

Section: Graphene For Rechargeable Batteriesmentioning

confidence: 99%

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

Cai

2019

Small Methods

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Graphene is recognized as the next generation of energy materials due to its spectacular physical properties. Meanwhile, there are diverse synthetic methods toward graphene, and these methods have unique advantages to impel graphene to be suitable for different energy devices. Chemical vapor deposition and reduction of graphene oxide are classical methods for preparing graphene with various lattice structures and layer numbers, resulting in the tunability of graphene properties, whereby the synthetic methods have significant effects on energy device performances. Therefore, this review pays close attention to the discrepancies of graphene‐based materials prepared by these two methods for use in solar cells, rechargeable batteries, and electrocatalysis for hydrogen evolution. Furthermore, the modifications of graphene are introduced to offset the weaknesses of synthetic methods. Then, the review introduces graphene‐based flexible energy devices because graphene prepared by these two methods shows similarity in their mechanical stability. Finally, other synthetic methods are shortly highlighted to explain the importance of these two methods. The analyses for the discrepancies and similarity of graphene‐based materials in classical energy devices from the aspect of synthesis are beneficial to guide the preparation and modifications of graphene for maximizing its application and promote practical usage in the future.

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“…Recently, a variety of graphene films [35][36][37] or graphene-based hybrid thin films, including Li 4 Ti 5 O 12 /reduced graphene oxide (rGO), [38] [40] Na 3 V 2 (PO 4 ) 3 /rGO, and Sb/rGO, [41] have been investigated as flexible electrodes for SIBs. For example, Zhang et al [41] used rGO to construct Sb/rGO and Na 3 V 2 (PO 4 ) 3 /rGO (NVP/rGO) paper-like electrodes for SIBs (Figure 2a).…”

Section: Flexible Electrodes Based On Graphene Substratesmentioning

confidence: 99%

“…In addition, graphene foam has also been used to fabricate flexible electrodes. [37,42] For instance, Chao et al [42] designed a VO 2 array anchored by graphene-foam-supported graphene quantum dots (GQDs). A self-standing cathode was fabricated by growing bilayered VO 2 on chemical vapor deposition (CVD)-grown graphene foam by the solvothermal process and subsequently coating the VO 2 array with a thin (≈2 nm) GQDs layer by the electrophoresis deposition process.…”

Section: Flexible Electrodes Based On Graphene Substratesmentioning

confidence: 99%

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

et al. 2017

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accessible lithium reserves are in remote or in politically sensitive areas. [5] This fact should sound the alarm for the expanded application of LIBs, because the increasing demand for LIBs could cause the price of lithium to skyrocket. It is even predicted that the world will run out of lithium supplies in the foreseeable future. [6][7][8] It is well known that sodium resources are more abundant (abundance: 23.6 × 10 3 mg kg −1 vs 20 mg kg −1 ) and vast (for example, the United States alone possesses 23 billion tons of soda ash which is a sodium-containing precursor) than lithium analog. Additionally, the trona (about $135-165 per ton), which could be used to produce sodium carbonate, has much lower cost than lithium carbonate (about $5000 per ton in 2010). [9,10] These two features endow SIBs with fascinating advantages for large-scale EES applications in the near future. Without doubt, SIBs also face big challenges: performance improvement and technological innovation. Although sodium has similar physical and chemical properties to lithium, the larger ionic radius of sodium ions compared with that of lithium ions restricts the insertion and extraction of sodium ions from the host materials commonly explored for LIBs. To address this problem, optimizing the chemical composition, tailoring the lattice structures, and regulating the morphologies of the host materials seem to be the most applicable strategies, and there have already been several excellent reviews. [11][12][13][14][15][16] As for technological innovation, the traditional fabrication processes mainly based on the slurrycasting method not only make SIBs typically rigid, thick, bulky, and heavy, but also reduce the overall volumetric/gravimetric energy density of the electrode. In the traditional slurry-casting method, the binders are insulating and electrochemically inactive, which can not only decrease the electrical conductivity, but also has a detrimental effect on the cycling stability resulting from some side effects between the electrolyte and inactive materials. In addition, the heavy weight of the binders, conductive additives and current collectors also reduces the volumetric/ gravimetric energy density of the overall electrode. Therefore, to enhance the battery performance and simplify the preparation process, the traditional slurry-casting method should be improved or even replaced; in other words, avoiding the use of binder, conductive additive, and metal current collector.In contrast, flexible electrodes are usually made from various active materials built on flexible conductive substrates without binder, conductive additive, and even metal current collector, Sodium-Ion Batteries

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Three dimensional cellular architecture of sulfur doped graphene: self-standing electrode for flexible supercapacitors, lithium ion and sodium ion batteries

Abstract: Multifunctional cellular architecture of sulfur doped graphene paves the way for high performance flexible energy device application.

Cited by 124 publications

References 65 publications

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

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