Construction of a low-defect and highly conductive 3D graphene network to enable a high sulphur content cathode for high performance Li–S/graphene batteries

Zhang, Shijie; Xiao, Weidong; Zhang, Yongshang; Liu, Kangli; Zhang, Xiangdan; Zhao, Jiangtao; Wang, Zhuo; Zhang, Peng; Shao, Guosheng

doi:10.1039/c8ta06869k

Cited by 47 publications

(36 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The UPS is generally hired to get the actual work function and position of the valence band. [ 25–29 ] UV–vis was employed to figure out the band gap energies of TiO 2 and Ti 3 C 2 . According to the test results and band structure theory, the electrons are found to transfer from Ti 3 C 2 to TiO 2 once the heterojunction is established and the direction of a formed internal electric field is consistent with the theoretical simulations.…”

Section: Figurementioning

confidence: 99%

Photogenerated Electron Transfer Process in Heterojunctions: In Situ Irradiation XPS

et al. 2020

Self Cite

View full text Add to dashboard Cite

Photoelectron transfer between heterojuctions is an important process for photocatalysis, and identification of the electron transfer process provides valuable information for catalyst design. Herein, Ti3C2, one of the widely used two‐dimensional materials, is used to produce a heterojunction of TiO2 and Ti3C2 by an in situ growth method and the photogenerated electrons transfer between the two components for photocatalytic water splitting to hydrogen is investigated. Theoretical simulation and experimental tests proclaim that electrons transfer from Ti3C2 to TiO2 forms an internal electric field, which implies that there exists the driving force of electronic movement from TiO2 to Ti3C2. In situ irradiation X‐ray photoelectron spectroscopy shows the binding energies of TiC (in Ti3C2) and TiO (in TiO2) move toward negative and positive positions, respectively, verifying the photogenerated electrons produced from TiO2 and transferring to Ti3C2 driven by the internal electric field. In addition, the amount of TiO2 nanoparticles also affects the hydrogen evolution rate. Several parallel experiments are designed to uncover the fact that less or excess amount of TiO2 nanoparticles leads to a tinier shift of binding energy, which hints the quantity of heterojunction is a considerable factor in photocatalytic performance. This work develops a new method to directly monitor the photoelectron transfer process between heterojuctions.

show abstract

Section: Figurementioning

confidence: 99%

Photogenerated Electron Transfer Process in Heterojunctions: In Situ Irradiation XPS

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The X‐ray diffractometer (XRD) patterns of CA, x PI‐CA ( x = 1, 2, 3) and 2PI‐CA/S are shown in Figure . For the CA sample, it can be found that two broad peaks at 2 θ = 21.5° and 43.5° correspond to the crystal face of (002) and (101) of graphite, indicating the existence of a graphite‐like structure . Compared with the CA sample, x PI‐CA presents a peak at about 2 θ = 20.5°.…”

Section: Resultsmentioning

confidence: 95%

Improved Performance and Immobilizing Mechanism of N‐doping Carbon Aerogel with Net Channel via Long‐Chain Directing for Lithium–Sulfur Battery

Shu

et al. 2019

Energy Tech

View full text Add to dashboard Cite

A novel net channel and N‐doping carbon aerogel (CA) are successfully prepared by an in situ and facile method via polyimide (PI) inducting for lithium–sulfur (Li–S) batteries. The PI‐directing carbon aerogel (PI‐CA) presents a cross‐linked framework, abundant porosity, and a high specific surface area. PI‐CA spheres present effective immobilizing polysulfides and high loading sulfur for a Brunauer–Emmett–Teller (BET) surface area of 2039.4 m2 g−1 and N‐doping via physical and chemical adsorption. The Li–S batteries with PI‐CA as cathode matrix exhibit excellent performance. In particular, the initial specific capacity of 2PI‐CA/S with sulfur content of 73.8 wt% delivers 1338 mAh g−1 and remains at 1102 mAh g−1 after 100 cycles at 0.2 C. The enhanced electrochemical performance mainly benefits from the mesh structure of the composite and the interaction between nitrogen and lithium polysulfide. The theoretical calculation by density functional theory (DFT) further supports the template effect of PI and the anchoring mechanism of polysulfides.

show abstract

“…The closeness in VBM positions for SG/S and VB provides strong evidence that overall the SG/S composite was highly conductive to electrons. It is amazing that the thorough coupling between graphene and over 80 wt% of sulfur induced such remarkable change in the electronic structures, thus leading to greatly improved electric conductivity throughout the SG/S composite owing to dramatic lifts in the VBM of SG/S towards the Fermi level thanks to the formation of heterojunctions between sulfur particles and the interlocking network of graphene flakes [52] .…”

Section: Resultsmentioning

confidence: 99%

“…It has been demonstrated recently that vertical graphene nanoflakes (VG) with extremely low defect contents can be synthesized by chemical vapor deposition (CVD) [48] on various substrates including amorphous carbon nanofibers [49] and carbon felt [50 , 51] . While such high-quality graphene nanoflakes are ideal conductors to both ion and electrons, the lack of defect is not helpful to absorb sulfur containing species and demonstrate chemically inert [52] .…”

Section: Introductionmentioning

confidence: 99%

In situ sulfur-doped graphene nanofiber network as efficient metal-free electrocatalyst for polysulfides redox reactions in lithium–sulfur batteries

Zhang

Hou

et al. 2020

Journal of Energy Chemistry

Self Cite

View full text Add to dashboard Cite

Construction of a low-defect and highly conductive 3D graphene network to enable a high sulphur content cathode for high performance Li–S/graphene batteries

Abstract: A low-defect and highly conductive 3D graphene network to enable a high sulfur content cathode for high performance Li–S batteries.

Cited by 47 publications

References 72 publications

Photogenerated Electron Transfer Process in Heterojunctions: In Situ Irradiation XPS

Photogenerated Electron Transfer Process in Heterojunctions: In Situ Irradiation XPS

Improved Performance and Immobilizing Mechanism of N‐doping Carbon Aerogel with Net Channel via Long‐Chain Directing for Lithium–Sulfur Battery

In situ sulfur-doped graphene nanofiber network as efficient metal-free electrocatalyst for polysulfides redox reactions in lithium–sulfur batteries

Contact Info

Product

Resources

About