Carbon quantum dot/CuS<sub>x</sub>nanocomposites towards highly efficient lubrication and metal wear repair

Huang, Hui; Hu, Hailiang; Qiao, Shi Zhang; Bai, Liang; Han, Mumei; Liu, Yang

doi:10.1039/c5nr01923k

Cited by 68 publications

(24 citation statements)

References 29 publications

(33 reference statements)

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“…Figure h gives the Cu 2p spectrum of Cu x S in the Cu x S@NC/S‐F sample; the divided peaks at ≈931.2 and 951.1 eV are specified as Cu 2p 3/2 and Cu 2p 1/2 of Cu 2+ derived from CuS . The peak presented at 932.1 eV belongs to Cu + species in Cu‐N, or from Cu 2 S . And the high‐resolution S 2p XPS spectrum is shown in Figure i; the peaks located at 160.7 and 161.2 eV correspond to the SCu bond from the mixed‐phase of CuS and Cu 2 S and further explains the confinement of sulfur through chemical affects.…”

Section: Resultsmentioning

confidence: 99%

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Luo

et al. 2018

Adv Funct Materials

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Lithium-sulfur (Li-S) batteries are promising energy storage systems due to their large theoretical energy density of 2600 Wh kg −1 and cost effectiveness. However, the severe shuttle effect of soluble lithium polysulfide intermediates (LiPSs) and sluggish redox kinetics during the cycling process cause low sulfur utilization, rapid capacity fading, and a low coulombic efficiency. Here, a 3D copper, nitrogen co-doped hierarchically porous graphitic carbon network developed through a freeze-drying method (denoted as 3D Cu@ NC-F) is prepared, and it possesses strong chemical absorption and electrocatalytic conversion activity for LiPSs as highly efficient sulfur host materials in Li-S batteries. The porous carbon network consisting of 2D cross-linked ultrathin carbon nanosheets provides void space to accommodate volumetric expansion upon lithiation, while the Cu, N-doping effect plays a critical role for the confinement of polysulfides through chemical bonding. In addition, after sulfuration of Cu@NC-F network, the in situ grown copper sulfide (Cu x S) embedded within Cu x S@NC/S-F composite catalyzes LiPSs conversion during reversible cycling, resulting in low polarization and fast redox reaction kinetics. At a current density of 0.1 C, the Cu x S@NC/S-F composites' electrode exhibits an initial capacity of 1432 mAh g −1 and maintains 1169 mAh g −1 after 120 cycles, with a coulombic efficiency of nearly 100%. development of advanced energy storage systems. Li-S batteries have been considered a new generation energy storage system because of their high theoretical energy density of 2600 Wh kg −1 and theoretical specific capacity of 1675 mAh g −1 , [1] and the merits of safe, low-cost and nonpolluting also make these batteries an exceptional storage system. To date, researchers' knowledge of boosting the energy density of Li-S batteries has resulted in an increase in energy density to 500 Wh kg −1 or more. However, a series of problems inherent in Li-S batteries remain unsolved, such as the low conductivity of sulfur (5 × 10 −30 S cm −1 at 25 °C) and its discharge products (Li 2 S/Li 2 S 2 ), [2] the solubility and shuttle effect of long-chain LiPS intermediates (Li 2 S n , 4 ≤ n ≤ 8), and large volume expansion of ≈80% cause low sulfur utilization, rapid capacity fading, and poor rate-performance and low coulombic efficiency, which still limit practical applications of Li-S batteries. [3,4] At the current stage of Li-S battery research, research has been concentrated on reducing the shuttle effect by advancing electrolyte additives, [5] optimizing cathode structures, [6] using modified separators or bifunctional interlayers, [7,8] and devising protective anode structures, [9] to enable sufficient protection and Lithium-Sulfur BatteriesThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Section: Resultsmentioning

confidence: 99%

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Luo

et al. 2018

Adv Funct Materials

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“…The significant friction-reducing and antiwear properties of GQDs are attributed to their splendid nanolubrication effects. Kang et al [142] employed a facile method to synthesize a novel CQDs/CuSx nanocomposite on a large scale. Thanks to the good compatibility and dispersion stability of nanocomposite, which was directly used as a lubricant additive for liquid paraffin.…”

Section: Cqds As Additives In Mineral Oilsmentioning

confidence: 99%

Applications of carbon quantum dots in lubricant additives: a review

Tang

Zhang

2021

J Mater Sci

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Advances in lubricants are vital to the pursuit of energy efficiency and sustainable development. It is well known that the essence of lubricating oil is lubricant additives, especially the friction-reducing and anti-wear additives. Carbon quantum dots (CQDs), a novel zero-dimensional carbon-based nanomaterial, have attained growing expectations in material and chemical sciences because of their extraordinary properties such as low toxicity and environmentally friendly, high chemical and thermal stability, and good designability. Since their discovery, CQDs have shown great potential in many applications including sensors, medicine, photovoltaic devices, biology, and tribology. The latest application of CQDs as the high-performance friction-reducing and antiwear additives has garnered increasing attention. With the in-depth study, CQDs have gradually exhibited their excellent tribological properties, especially acted as additives in lubricating base oils. This paper has reviewed the progress in the research and development of CQDs-based lubricant additives by introducing lots of successful applications of CQDs-based additives in the present work and then highlighted the friction-reducing and anti-wear property, superiority, as well as the lubrication mechanism of CQDs as an additive, along with some discussion on challenges and perspectives in this significant and promising field. Finally, we offered a series of suggestions for developing the next-generation high-performance CQDs-based lubricant additives.

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“…Graphene quantum dots (GQDs), a type of cuttingedge quantum dots (QDs), synthesized from graphene, not only retain the structure of graphene (the size is from 2 to 10 nm) but also exhibit distinct physicochemical performances, such as photo-induced electron transfer, photoluminescence, and electron reservoir properties. [6,7] Moreover, GQDs can be used as functional carbon for constructing new nanostructured materials to display outstanding lubrication performances based on the graphene-layered structure and subsize. Rabaso et al inferred that fullerene-like nanoparticles could be more easily transferred to the contact surface between friction counterparts to quickly promote the formation of low-friction and low-wear protection film.…”

Section: Introductionmentioning

confidence: 99%

“…From a more fundamental perspective, another low‐dimensional carbon material has drawn scientists’ attention. Graphene quantum dots (GQDs), a type of cutting‐edge quantum dots (QDs), synthesized from graphene, not only retain the structure of graphene (the size is from 2 to 10 nm) but also exhibit distinct physicochemical performances, such as photo‐induced electron transfer, photoluminescence, and electron reservoir properties . Moreover, GQDs can be used as functional carbon for constructing new nanostructured materials to display outstanding lubrication performances based on the graphene‐layered structure and subsize.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

et al. 2020

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The 2D Ti 3 C 2 /graphene quantum dots (GQDs) composite coating contains numerous merits, which offers underlying solutions for lubrication issues in common conditions. Herein, specific efforts are devoted to explore and develop the antiwear interfacial performances of 2D Ti 3 C 2 /GQDs hybrid multicoating in common environment. In addition, combination with nanodiamond would impose significant effects on improving lubricity of binary composite coating to obtain long-durability ternary composite coating. Meanwhile, macroscale and atomicscale characterizations are utilized to detect the lubrication behavior of binary and ternary composite coating to illuminate the influence of compositions on the establishment of ultralow-wear interfaces on slip process. These testing results highlight an outspread lubrication mechanism for 2D Ti 3 C 2 /GQDs hybrid multicoating. They suggest that 2D Ti 3 C 2 /GQDs and 2D Ti 3 C 2 /nanodiamond/ GQDs composite coating exhibit ultralow wear with rubbing against polytetrafluoroethylene ball. A newly nanostructured tribofilm is formed on the sliding contact. Also the 2D Ti 3 C 2 /nanodiamond/GQDs ternary coating has longdurability and ultralow-wear during sliding for a long time.

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Carbon quantum dot/CuS_xnanocomposites towards highly efficient lubrication and metal wear repair

Cited by 68 publications

References 29 publications

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Applications of carbon quantum dots in lubricant additives: a review

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

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Carbon quantum dot/CuSxnanocomposites towards highly efficient lubrication and metal wear repair

Cited by 68 publications

References 29 publications

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Applications of carbon quantum dots in lubricant additives: a review

Interfacial Nanostructure of 2D Ti3C2/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

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Carbon quantum dot/CuS_xnanocomposites towards highly efficient lubrication and metal wear repair

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear