Direct fabrication of nanoporous graphene from graphene oxide by adding a gasification agent to a magnesiothermic reaction

Xing, Zhenyu; Wang, Bao; Halsted, Joshua; Raghu, S.; Stickle, William F.; Ji, Xiulei

doi:10.1039/c4cc08977d

Cited by 38 publications

(20 citation statements)

References 30 publications

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“…Hence, it can be concluded that the rGO present in the composite is not contributing significantly to the capacity; rather it improves the interfacial electron transfer in between MoS 2 and rGO surfaces during charge/discharge process. Further rGO induces an increased porosity and high surface area of the composite material 37 38 which can facilitate transport of solvated Na-ion through the electrode, as a result of which, Na + can reach each part of electrode materials. rGO can also act as a mechanical buffer to ensure that no change in the electronic connectivity of MoS 2 nanoflowers occurs due to the volume change encountered during sodiation/desodiation and helps to maintain the structural integrity of the composite electrode.…”

Section: Resultsmentioning

confidence: 99%

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Sahu

Mitra

2015

Sci Rep

197

126

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Three dimensional (3D) MoS2 nanoflowers are successfully synthesized by hydrothermal method. Further, a composite of as prepared MoS2 nanoflowers and rGO is constructed by simple ultrasonic exfoliation technique. The crystallography and morphological studies have been carried out by XRD, FE-SEM, TEM, HR-TEM and EDS etc. Here, XRD study revealed, a composite of exfoliated MoS2 with expanded spacing of (002) crystal plane and rGO can be prepared by simple 40 minute of ultrasonic treatment. While, FE-SEM and TEM studies depict, individual MoS2 nanoflowers with an average diameter of 200 nm are uniformly distributed throughout the rGO surface. When tested as sodium-ion batteries anode material by applying two different potential windows, the composite demonstrates a high reversible specific capacity of 575 mAhg−1 at 100 mAg−1 in between 0.01 V–2.6 V and 218 mAhg−1 at 50 mAg−1 when discharged in a potential range of 0.4 V–2.6 V. As per our concern, the results are one of the best obtained as compared to the earlier published one on MoS2 based SIB anode material and more importantly this material shows such an excellent reversible Na-storage capacity and good cycling stability without addition of any expensive additive stabilizer, like fluoroethylene carbonate (FEC), in comparison to those in current literature.

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Section: Resultsmentioning

confidence: 99%

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Sahu

Mitra

2015

Sci Rep

197

126

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“…The difference of domain sizes may relate to melting points of metals, which are 2623, 3422, 1246, 1495, 419, and 1668 °C for Mo, W, Mn, Co, Zn, and Ti, respectively. Based on our previous studies, LRR releases enormous heat, which raises reaction temperatures to approach the melting temperatures of Ti, Zn, Mn, and Co. [ 14 ] Thus, the freshly formed Ti, Zn, Mn, and Co particles agglomerate, resulting in enlarged crystallite sizes. In contrast, Mo and W crystallites are small due to their inherently high melting points.…”

Section: Figurementioning

confidence: 99%

Consolidating Lithiothermic‐Ready Transition Metals for Li₂S‐Based Cathodes

et al. 2020

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Li2S holds a promising role as a high‐capacity Li‐containing cathode, circumventing use of metallic lithium in constructing next‐generation batteries to replace current Li‐ion batteries. However, progress of Li2S cathode has been plagued by its intrinsic drawbacks, including high activation potentials, poor rate performance, and rapid capacity fading during long cycling. Herein, a series of Li2S/transition metal (TM) nanocomposites are synthesized via a lithiothermic reduction reaction, and it is realized that the presence of TMs in Li2S matrix can transform electrochemical behaviors of Li2S. On the one hand, the incorporation of W, Mo, or Ti greatly increases electronic and ionic conductivity of Li2S composites and inhibits the polysulfide dissolution via the TMS bond, effectively addressing the drawbacks of Li2S cathodes. In particular, Li2S/W and Li2S/Mo exhibit the highest ionic conductivity of solid‐phase Li‐ion conductors ever‐reported: 5.44 × 10−2 and 3.62 × 10−2 S m−1, respectively. On the other hand, integrating Co, Mn, and Zn turns Li2S into a prelithiation agent, forming metal sulfides rather than S8 after the full charge. These interesting findings may shed light on the design of Li2S‐based cathode materials.

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“…For example, two-dimensional graphene nanosheets, one-dimensional graphene nanoribbons, and zero-dimensional graphene quantum dots have been obtained9111213. Moreover, activated graphene14, graphene-assembled foam15, graphene paper16, graphene fiber17, graphene-based hydrogel or aerogel1819 and nanoporous graphene2021 materials have been synthesized by different methods, and the obtained materials were used to prepare macroscopic, large dimension monolith for further applications. As a result, the performance of graphene-based materials used as electrode in supercapacitors has been improved4514151617181920.…”

mentioning

confidence: 99%

Interaction between Nitrogen and Sulfur in Co-Doped Graphene and Synergetic Effect in Supercapacitor

Wang

et al. 2015

Sci Rep

249

162

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The co-doping of graphene with nitrogen and sulfur was investigated aiming at understanding their interactions with the presence of oxygen in graphene. The co-doped graphene (NS-G) was synthesized via a one-pot hydrothermal route using graphene oxide as starting material and L-cysteine, an amino acid containing both N and S, as the doping agent. The obtained NS-G with a three-dimensional hierarchical structure containing both macropores and mesopores exhibited excellent mechanical stabilities under both wet and dry conditions. As compared to N or S singly doped graphene, the co-doped sample contains significantly higher concentrations of N and S species especially pyrollic N groups. The co-doped sample considerably outperformed the singly doped samples when used as free-standing electrode in supercapacitors due to enhanced pseudocapacitance. The simultaneous incorporation of S and N species with the presence of oxygen significantly modified the surface chemistry of carbon leading to considerably higher doping levels, although directly bonding between N and S is neither likely nor detected. Hence, the synergetic effect between N and S occurred through carbon atoms in neighboring hexagonal rings in a graphene sheet.

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Direct fabrication of nanoporous graphene from graphene oxide by adding a gasification agent to a magnesiothermic reaction

Cited by 38 publications

References 30 publications

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Consolidating Lithiothermic‐Ready Transition Metals for Li₂S‐Based Cathodes

Interaction between Nitrogen and Sulfur in Co-Doped Graphene and Synergetic Effect in Supercapacitor

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Direct fabrication of nanoporous graphene from graphene oxide by adding a gasification agent to a magnesiothermic reaction

Cited by 38 publications

References 30 publications

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Exfoliated MoS2 Sheets and Reduced Graphene Oxide-An Excellent and Fast Anode for Sodium-ion Battery

Consolidating Lithiothermic‐Ready Transition Metals for Li2S‐Based Cathodes

Interaction between Nitrogen and Sulfur in Co-Doped Graphene and Synergetic Effect in Supercapacitor

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Consolidating Lithiothermic‐Ready Transition Metals for Li₂S‐Based Cathodes