Enhanced photocatalytic activity of N, P, co-doped carbon quantum dots: An insight from experimental and computational approach

Yashwanth, H.J.; Rondiya, Sachin R.; Dzade, Nelson Y.; Dhole, S.D.; Phase, D. M.; Hareesh, K.

doi:10.1016/j.vacuum.2020.109589

Cited by 32 publications

(25 citation statements)

References 23 publications

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“…For the graphitic C sites, the O 2p orbital mainly contributed to the DOS below the Fermi level after the adsorption of Li 2 O 2 and Li 4 O 4 , indicating relative low efficiency of charge transfer during the catalytic process. [ 59 ] These results reveal that the graphitic PN sites can provide an efficient charge transfer path during the ORR/OER process for the carbon catalyst in the LOBs.…”

Section: Resultsmentioning

confidence: 94%

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

Huang

Cheng

Zhang

et al. 2022

Adv Funct Materials

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Strong oxidant intermediates and the formation of byproducts during the discharge/charge process are the main challenges in the degradation of lithium-oxygen batteries (LOBs). A facile approach to maintain the stability of the cathode catalyst and avoid the formation of byproducts is essential for the development of LOBs. Here, a sawdust-derived carbon catalyst is fabricated and subjected to surface phosphatization to suppress corrosion between carbon and electrolyte/products. This prevents the formation of byproducts from parasitic reactions and boosts the reaction kinetics of the carbon catalyst in LOBs. The doped P atoms will prior to substitute an N atom in pyrrolic-N sites to form graphitic PN sites, instead of the graphitic PC sites. Experimental and density functional theory calculations reveal that the graphitic PN sites can function as a reaction kinetics promoter for the formation/decomposition of discharge products. Moreover, the graphitic PN sites can also prevent the formation of byproduct Li 2 CO 3 from the corrosion of the carbon catalyst, despite its poor catalytic capability in LOBs. As a result, the sawdust-derived P-doped catalyst exhibits an enhanced specific capacity of ≈20 000 mAh g -1 and long cycle stability of 226 and 160 cycles at 200 and 500 mA g -1 , respectively.

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Section: Resultsmentioning

confidence: 94%

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

Huang

Cheng

Zhang

et al. 2022

Adv Funct Materials

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“…While the CQD suspension on the left was dark blue with no fluorescence under day light, it fluoresced bright blue as shown on the right under UV light with a wavelength of 365 nm. The UV‐vis absorbance spectrum of the CQDs exhibited two absorption peaks around 234 and 330 nm, corresponding to the π‐π* transition of the aromatic sp 2 domains, including the C=C and C=N bonds, and the n‐π* transition of C=O 22‐24 . As shown in Figure S1, the FT‐IR spectrum of CQDs displayed stretching vibrational peaks at approximately 3446, 3213, 1662, 1631, 1576, 1394, and 1166 cm −1 , corresponding to O–H, N/C–H, C=O, C=C, C–N, C–H, and N–H 19,25 .…”

Section: Resultsmentioning

confidence: 98%

“…The UV-vis absorbance spectrum of the CQDs exhibited two absorption peaks around 234 and 330 nm, corresponding to the π-π* transition of the aromatic sp 2 domains, including the C=C and C=N bonds, and the n-π* transition of C=O. [22][23][24] As shown in Figure S1, the FT-IR spectrum of CQDs displayed stretching vibrational peaks at approximately 3446, 3213, 1662, 1631, 1576, 1394, and 1166 cm À1 , corresponding to O-H, N/C-H, C=O, C=C, C-N, C-H, and N-H. 19,25 Thus, it was verified that Ndoped CQDs were successfully fabricated via hydrothermal treatment utilizing urea as the nitrogen doping source. in Figure S2.…”

Section: Resultsmentioning

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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“…These newly originated energy states move the Fermi energy level towards the conduction band, leading to the exchange of electrons faster than the CQDs alone. 22,23 The atomic size of nitrogen is nearly the same as that of carbon and it has five electrons in its outermost shell, which can bond with other carbon atoms. Therefore, nitrogen doping increases the surface-state defects of CQDs.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, other heteroatoms such as boron, phosphorus, sulphur and selenium can also be doped to carbon quantum dots to improve their optical and catalytic properties. 23 Nevertheless, phosphorus has five valence electrons in its outermost shell so that introducing phosphorus results in the formation of substitutional energy levels in CQDs. 24 Therefore, both nitrogen and phosphorus in CQDs act as n-type donors and improve the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Improved photocatalytic activity of TiO₂ nanoparticles through nitrogen and phosphorus co-doped carbon quantum dots: an experimental and theoretical study

Yashwanth

Rondiya

Dzade

et al. 2022

Phys. Chem. Chem. Phys.

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Enhanced photocatalytic activity of N, P, co-doped carbon quantum dots: An insight from experimental and computational approach

Cited by 32 publications

References 23 publications

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

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

Improved photocatalytic activity of TiO₂ nanoparticles through nitrogen and phosphorus co-doped carbon quantum dots: an experimental and theoretical study

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Enhanced photocatalytic activity of N, P, co-doped carbon quantum dots: An insight from experimental and computational approach

Cited by 32 publications

References 23 publications

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

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

Improved photocatalytic activity of TiO2 nanoparticles through nitrogen and phosphorus co-doped carbon quantum dots: an experimental and theoretical study

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Improved photocatalytic activity of TiO₂ nanoparticles through nitrogen and phosphorus co-doped carbon quantum dots: an experimental and theoretical study