2023
DOI: 10.1002/smll.202303156
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Solvent Engineering of Oxygen‐Enriched Carbon Dots for Efficient Electrochemical Hydrogen Peroxide Production

Abstract: The development of cost‐effective and reliable metal‐free carbon‐based electrocatalysts has gained significant attention for electrochemical hydrogen peroxide (H2O2) generation through a two‐electron oxygen reduction reaction. In this study, a scalable solvent engineering strategy is employed to fabricate oxygen‐doped carbon dots (O‐CDs) that exhibit excellent performance as electrocatalysts. By adjusting the ratio of ethanol and acetone solvents during the synthesis, the surface electronic structure of the re… Show more

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Cited by 49 publications
(20 citation statements)
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“…The two strong Raman shifts at 706 and 1235 cm –1 were caused by different types of cyclic breathing patterns of S-triazine . For dr-CQDs, two broad peaks at 1344 and 1581 cm –1 corresponded to the D and G bands, respectively, characteristic of a typical graphite structure. , Unfortunately, no dr-CQDs signal was observed in the XRD, FT-IR, and Raman spectra of CN-CQD and CN@CQD, possibly due to the small mass ratio (approximately 2%) of dr-CQDs in the samples.…”
Section: Resultsmentioning
confidence: 98%
“…The two strong Raman shifts at 706 and 1235 cm –1 were caused by different types of cyclic breathing patterns of S-triazine . For dr-CQDs, two broad peaks at 1344 and 1581 cm –1 corresponded to the D and G bands, respectively, characteristic of a typical graphite structure. , Unfortunately, no dr-CQDs signal was observed in the XRD, FT-IR, and Raman spectra of CN-CQD and CN@CQD, possibly due to the small mass ratio (approximately 2%) of dr-CQDs in the samples.…”
Section: Resultsmentioning
confidence: 98%
“…We used the Vienna Ab-initio Simulation Package (VASP, 5.4.4) code 54, 55 with GGA-PBE exchange-correlation functional 56 for DFT calculations. The project-augmented wave (PAW) pseudopotential , for describing the core-valence interactions and a cutoff of 450 eV were used. ,, The computational hydrogen electrode (CHE) was used to calculate the free energy of each intermediate state. The free energy of a chemical reaction is calculated as ΔGn = ΔEn-TΔS + ΔZPE, where ΔEn is the DFT-calculated reaction energy in vacuum, TΔS is the entropy contribution to the reaction at T = 298.15 K, and ΔZPE is the zero-point energy (ZPE) correction based on the calculated vibrational frequencies. The elemental reaction steps for the CO 2 electrocatalytic reduction to CO are shown in eqs –. CO 2 + normalH + + normale * COOH * COOH + normalH + + normale * CO + normalH 2 normalO * CO CO …”
Section: Methodsmentioning
confidence: 99%
“…3 At present, anthraquinone oxidation (AQ) is the conventional technique for the commercial synthesis of H 2 O 2 ; however, this approach leads to substantial noxious by-products, toxic solvent use, and extensive energy consumption. 4,5 Additionally, the direct catalytic combination of H 2 and O 2 (such as Pd or Au/Pd) has explosion hazards, whereas the electrochemical method has selectivity issues and hence has not yet been used in industrial production. 6 Considerable effort has been put into investigating the most efficient and environmentally viable technique to substitute the AQ method and meet the diversified demand.…”
Section: Introductionmentioning
confidence: 99%