Fluorine-doped carbon quantum dot interfacial layer on stockade-like etched copper foil for boosting Li-ion storage

Shin, Dong-Yo; Sung, Ki‐Wook; Ahn, Hyo‐Jin

doi:10.1016/j.cej.2020.127563

Cited by 22 publications

(31 citation statements)

References 35 publications

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“…Their elemental composition from XPS was C, N, O, and F (Figure S5, Supporting Information), indicating that F-CDs formed during the hydrothermal process. [36] The TEM images in Figure S6, Supporting Information, in the Supporting Information show that the F-CDs were ≈5 nm in diameter, which is consistent with the average radius of the F-CDs in F-CDs/CoP. This fully demonstrates that urea underwent cross-linked carbonization during the hydrothermal process to form CDs (Figures S7-S8, Supporting Information).…”

Section: Synthesis and Characterizationsupporting

confidence: 71%

“…[29,30] The single peak at 687.0 eV is the fine structure spectrum of F 1s. [35,36] These XPS results show that the raw materials containing C and F required for the synthesis of F-CDs/CoP were hydrothermally converted into F-CDs, and then compounded with CoCH. The coupling interface of CoP modified with F-CDs derived from urea and ammonium fluoride precursors was effectively optimized, which improved the adsorption energy of the catalyst for hydrogen and oxygen, increased the catalytic activity, and led to good stability.…”

Section: Synthesis and Characterizationmentioning

confidence: 96%

“…[33] Moreover, doping/modification using heteroatoms (e.g., N, P, F, or Cl) can enhance the electronic interaction between the CDs and the metal, promote electron transfer, and further improve the catalytic performance of the composite material. [34][35][36][37] Note that halogens are used as powerful structural regulators in crystal engineering and other fields owing to their high specificity and directionality. [38][39][40][41] Combining halogens with CDs and introducing them into the design and construction of 3D TMPs composites is expected to control the morphology and surface defects of the composites and increase the number of active sites.…”

mentioning

confidence: 99%

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Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Song

Tang

et al. 2022

Advanced Energy Materials

143

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such technique that is promising for hydrogen production, and comprises an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER). [4][5][6][7] This reaction system is generally best aided by noble-metal catalysts such as Pt and RuO 2 /IrO 2 . However, these metals' scarcity and cost severely hinder their widespread application. [8][9][10] Therefore, the development of highly efficient, stable, and inexpensive electrocatalysts to replace precious metals for the integrated HER/OER reaction is crucial to promoting the development of water splitting. [11][12][13] Transitional metal phosphides (TMPs), such as CoP, [14][15][16] Ni 5 P 4 , [17][18][19][20][21][22] and MoP, [23][24][25] have attracted wide attention owing to their low cost, simple preparation, good electrical conductivity, suitable d-electron configuration, moderate intermediate bond energy, and abundant chemical states. [26][27][28] Among them, CoP has demonstrated excellent electrocatalysis because it facilitates the adsorption and desorption of hydrogen and oxygen. However, its weak conductivity and poor corrosion resistance reduce its activity and stability in comparison with Pt-based materials. [29] Carbon-based nanomaterials are widely used in the design of electrocatalysts owing to their excellent resistance to acid and alkali corrosion and good electrical conductivity. [30][31][32] Carbon dots (CDs), as a new type of 0D carbon nanomaterial, have the advantages of simple synthesis and low price. Their graphitized core has good conductivity, and the abundant functional groups on the outer shell can coordinate and cross-link with metal ions to form 3D network structures, which can effectively inhibit the agglomeration and growth of metal nanoparticles. [33] Moreover, doping/modification using heteroatoms (e.g., N, P, F, or Cl) can enhance the electronic interaction between the CDs and the metal, promote electron transfer, and further improve the catalytic performance of the composite material. [34][35][36][37] Note that halogens are used as powerful structural regulators in crystal engineering and other fields owing to their high specificity and directionality. [38][39][40][41] Combining halogens with CDs and introducing them into the design and construction of 3D TMPs composites is expected to control the morphology and surface defects of the composites and increase the number of active sites. [34,39] In addition, traditional powder catalysts often Designing a stable and efficient dual-functional catalyst for the hydrogen evolution and oxygen evolution reactions (HER/OER) is of great significance to the development of hydrogen production by water splitting. This work reports on novel halogen (X = F, Cl, and Br)-doped carbon dots modifying amorphous cobalt phosphide (X-CDs/CoP), which can be tuned by the choice of X-CDs to have urchin, Pinus bungeana, and Albizia julibrissin type structures. The different characteristics of the various X-CDs led to different formation mechanisms and final structures. As a bifunction...

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Section: Synthesis and Characterizationsupporting

confidence: 71%

Section: Synthesis and Characterizationmentioning

confidence: 96%

mentioning

confidence: 99%

See 1 more Smart Citation

Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Song

Tang

et al. 2022

Advanced Energy Materials

143

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“…This uniform CQD lamination layer can provide high chemical stability by preventing the corrosion of Al foil from by-products such as HF. 13 To confirm the morphology and structure of the CQDs, TEM analysis was conducted as shown in Figure 2A,B. The low-resolution TEM image in Figure 2A shows that the CQDs have an average size of $4.13 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Owing to the advantages of a small particle size and increased surface functional groups, the CQDs can be more uniformly laminated compared with other carbon-based coating materials, like carbon nanotubes or graphene. 4,13 The ultrasonic spray coating method also has additional merits, such as simplicity, a low cost, and reproducibility. In particular, the ultrasonic vibration of spraying nozzle generates fine precursor droplets, enabling the formation of a more uniform coating layer on a complex surface when compared with other coating methods such as dip or conventional spray coating.…”

Section: Introductionmentioning

confidence: 99%

Carbon quantum dot‐laminated stepped porous Al current collector for stable and ultrafast lithium‐ion batteries

Sung

Kim

Ahn

2022

Intl J of Energy Research

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Designing an interfacial architecture between the current collector and electrode plays a serious role in developing the specific capacity with cycling stability of lithium-ion batteries (LIBs). Consequently, an original approach to enhance the structure of the interface between the current collector and electrode is necessary. Thus, we developed a novel interface architecture based on carbon quantum dots (CQDs)-laminated on a stepped porous Al (SP-Al) current collector to attain stable and ultrafast-discharge LIBs and CQD-SP-Al for application as LIB cathodes. To this end, the electrochemical etching and ultrasonic spray coating methods were employed. The cathode assembled with CQD-SP-Al displayed the adhesion enhancing, an increased redox reaction kinetics, and the magnificent interfacial stability of the current collector//electrode interface because of the increased surface roughness, stepped pores with N-doped CQD, and uniform CQD lamination layer. The resultant cathode with CQD-SP-Al showed an enhanced specific capacity of 78.2 mAh/g and capacity retention of 92.6% at a high C-rate of 10C after 500 cycles. This great cycling stability is due to an expanded interfacial contact area of current collector// electrode with improved adhesion, as well as to the CQD lamination layer, while the excellent ultrafast discharge capacity is ascribed to the risen number of charge supplying/collecting sites, the stepped porous structure, and the highly conductive N-doped CQD lamination layer.

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Developments, Novel Concepts, and Challenges of Current Collectors: From Conventional Lithium Batteries to All‐Solid‐State Batteries

Zhang,

Jing,

Shen

et al. 2024

ChemElectroChem

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With the innovation and evolution of lithium batteries, different active materials are loaded onto the current collectors, leading to remarkable changes in the components that directly interact with the current collectors. The surface/interface of current collectors in lithium batteries is gradually becoming one of the key factors to improve the overall performance. The thickness, material composition, surface morphology, and intrinsic properties of current collectors are crucial for understanding chemo‐mechanical changes during electrochemical reactions. Despite the widely acknowledged importance of highly efficient electron transportation and improved interfacial performance of current collectors as one of the determinants of exceptional lithium battery performance, insufficient attention has been given to exploring targeted design strategies for current collectors used in various lithium batteries. Particularly, as the development of solid‐state lithium batteries in full swing, there are limited studies focused on current collectors in all‐solid‐state lithium batteries (ASSLBs). This review introduces recent advancements in current collector technology, while highlighting both similarities and differences between negative current collectors applied in conventional lithium batteries and ASSLBs. Furthermore, we propose promising prospects for utilization of alloy materials as next‐generation negative current collectors.

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Fluorine-doped carbon quantum dot interfacial layer on stockade-like etched copper foil for boosting Li-ion storage

Cited by 22 publications

References 35 publications

Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Carbon quantum dot‐laminated stepped porous Al current collector for stable and ultrafast lithium‐ion batteries

Developments, Novel Concepts, and Challenges of Current Collectors: From Conventional Lithium Batteries to All‐Solid‐State Batteries

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