2023
DOI: 10.1016/j.carbon.2022.11.052
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Understanding the nature of graphene oxide functional groups by modulation of the electrochemical reduction: A combined experimental and theoretical approach

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Cited by 39 publications
(31 citation statements)
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“…Additionally, in the sample discharged with a 0.1 mA cm –2 current density, a new intense feature appears at 289.35 eV (blue shaded curve), attributable to carbonate species. ,, This same peak appears also in the sample discharged at 0.05 mA cm –2 (Figure d,e), but is accompanied by the emergence of a lower energy feature at 288.71 eV, which results even more intense in the sample discharged at 0.025 mA cm –2 . This feature (cyan-filled curves in Figure ) can be attributed to carboxylate species . The presence of carbonate and carboxylate species has already been reported by us ,,, and other authors in the past, , and, in both cases, can be associated to degradation phenomena occurring during discharge of the Li–O 2 cell due to chemical or mixed chemical/electrochemical oxidation of carbon-containing species.…”
Section: Resultssupporting
confidence: 72%
See 1 more Smart Citation
“…Additionally, in the sample discharged with a 0.1 mA cm –2 current density, a new intense feature appears at 289.35 eV (blue shaded curve), attributable to carbonate species. ,, This same peak appears also in the sample discharged at 0.05 mA cm –2 (Figure d,e), but is accompanied by the emergence of a lower energy feature at 288.71 eV, which results even more intense in the sample discharged at 0.025 mA cm –2 . This feature (cyan-filled curves in Figure ) can be attributed to carboxylate species . The presence of carbonate and carboxylate species has already been reported by us ,,, and other authors in the past, , and, in both cases, can be associated to degradation phenomena occurring during discharge of the Li–O 2 cell due to chemical or mixed chemical/electrochemical oxidation of carbon-containing species.…”
Section: Resultssupporting
confidence: 72%
“…This feature (cyan-filled curves in Figure 9) can be attributed to carboxylate species. 105 The presence of carbonate and carboxylate species has already been reported by us 6,7,102,103 and other authors in the past, 104,106 and, in both cases, can be associated to degradation phenomena occurring during discharge of the Li−O 2 cell due to chemical or mixed chemical/electrochemical oxidation of carbon-containing species. On the C-free NCCr electrocatalysts, this chemical attack is exerted by the highly reactive oxygen species formed during reduction of molecular O 2 (mainly singlet oxygen, 1 O 2 and the peroxide species), 3,107 at the expenses of the only carbon-containing compounds, i.e., the TEGDME solvent.…”
Section: Post-mortem Studies Of Nccr Samples: Xpsmentioning
confidence: 60%
“…Graphene is a carbon-based bidimensional material prepared through top-down and bottom-up approaches. [1][2][3][4][5][6] In the rst route, graphene is prepared from graphite through its exfoliation, sometimes in presence of intercalating agents and, in the second one, through chemical vapor deposition (CVD) from a mixture of methane/hydrogen. While the rst approach is hampered by some drawbacks, such as low yield of production, low purity and time-consuming processes, the second one is limited to the growth of graphene sheets onto transition metals and alloys surfaces, which narrows its bulk production for practical applications.…”
Section: Introductionmentioning
confidence: 99%
“…[ 38,42 ] Notably, compared to pristine GO, the G band of both types of RGO is slightly red‐shifted to ≈1594 cm −1 , and a new component D′ appears at ≈1610 cm −1 , as a result of the extensive reduction. [ 23,24,37,41,43–46 ]…”
Section: Resultsmentioning
confidence: 99%
“…The C 1s spectrum of pristine GO (Figure 5a) displays two main peaks, respectively ascribable to localized C sp2 domains at 284.8 eV (red curve) and a convolution of C-O bonds from hydroxyl (286.4 eV, blue curve) and epoxide (287.0 eV, green curve) groups. [46][47][48] The peak at higher binding energy is deconvoluted into two components, assigned to carbonyl/carboxylate groups, at 288.1 eV (magenta curves in Figure 5a), and to the less abundant carboxyl moieties at 289.2 eV (orange curves in Figure 5a). [46] The presence of such oxygenated carbon functional groups was confirmed also by FTIR spectroscopy (Figure S2, Supporting Information).…”
Section: Uv-vis and Raman Spectroscopy Characterizationmentioning
confidence: 99%