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Almeida, Caio VS, et al. Journal of Electroanalytical Chemistry 878 (2020): 114663.
Polyhydroxylated fullerenes, C₆₀(OH)ₓ, have emerged as highly effective supports for platinum (Pt) nanoparticles in electrocatalytic applications. In this study, Pt/C₆₀(OH)ₓ composites were synthesized in aqueous media with varying hydroxylation degrees (x = 8-36) and evaluated for their catalytic performance in the ethanol oxidation reaction (EOR) under acidic conditions.
Among the series, Pt/C₆₀(OH)₂₄-₂₇ demonstrated superior electrocatalytic activity, with the highest specific current density and the lowest onset potential for ethanol oxidation. Compared to commercial Pt/C, this catalyst achieved up to a 2-fold increase in current density and exhibited enhanced long-term stability in chronoamperometric tests. In situ FTIR analyses confirmed improved C-C bond cleavage efficiency, likely due to the generation of reactive oxygen species by the fullerenol surface.
Characterization by TEM, XRD, and SEM/EDS confirmed successful Pt deposition and particle dispersion, though aggregation into larger clusters was observed. The enhanced catalytic activity is attributed to the bifunctional effect of surface OH groups and the increased density of low-coordination Pt sites.
These findings position polyhydroxylated fullerenes, particularly C₆₀(OH)₂₄-₂₇, as promising nanocarbon supports for the development of efficient and durable electrocatalysts in direct ethanol fuel cells (DEFCs).
Nowak, Katarzyna, et al. Radiation Physics and Chemistry 97 (2014): 325-331.
Polyhydroxylated fullerene C₆₀(OH)₃₆, also known as fullerenol, has been investigated for its potential protective effects on human peripheral blood mononuclear cells (PBMCs) exposed to high doses of ionizing radiation. In this study, PBMCs were treated with C₆₀(OH)₃₆ at concentrations of 75 and 150 mg/L prior to X-ray irradiation (10, 30, and 50 Gy). Cellular responses were evaluated at 24 and 48 hours post-irradiation using flow cytometry to assess lymphocyte viability and granularity, along with membrane fluidity and DNA damage analysis via DPH fluorescence anisotropy and comet assay, respectively.
Results indicated that C₆₀(OH)₃₆ had minimal impact on PBMC viability after 24 hours. However, after 48 hours, a clear radioprotective effect emerged. At 50 Gy, lymphocyte viability nearly doubled in the presence of C₆₀(OH)₃₆ compared to irradiated controls-suggesting a modest but significant protective role that is not concentration-dependent. Notably, C₆₀(OH)₃₆ did not affect non-irradiated cell survival, indicating specificity of its protective action.
Mechanistically, the fullerenol's effects are hypothesized to involve interactions at the plasma membrane rather than intracellular targets, potentially stabilizing membrane integrity post-irradiation.
These findings highlight the potential of polyhydroxylated fullerene C₆₀(OH)₃₆ as a biocompatible radioprotective agent, with promising implications for medical and radiological applications involving high-dose radiation exposure.
Krishna, Vijay, et al. Applied Catalysis B: Environmental 79.4 (2008): 376-381.
Polyhydroxy fullerenes (PHF) have demonstrated significant potential in improving the photocatalytic performance of titanium dioxide (TiO₂), particularly in dye degradation and microbial inactivation. In this study, the presence of PHF enhanced the generation of hydroxyl radicals by up to 60%, as confirmed by electron paramagnetic resonance (EPR) spectroscopy, supporting the hypothesis that PHF facilitates electron scavenging, thereby promoting radical formation.
Photocatalytic experiments with Procion Red MX-5B showed a 2.6-fold increase in the pseudo-first-order degradation rate when TiO₂ was used in combination with PHF, compared to TiO₂ alone. Notably, PHF alone exhibited minimal photocatalytic activity under UVA irradiation, confirming that the enhancement arises from synergistic interaction with TiO₂ rather than from PHF acting as a primary photocatalyst.
HR-TEM analysis of PHF-TiO₂ nanocomposites revealed surface interactions between PHF and TiO₂ nanoparticles, indicating successful adsorption. Although PHF can generate superoxide radicals under UVA and visible light, its radical generation is highly pH-dependent. At pH 6, as used in this study, PHF showed negligible superoxide production, aligning with its limited standalone photocatalytic activity.
These findings suggest that PHF is a promising co-catalyst for TiO₂-based systems, enhancing photocatalytic efficiency through improved hydroxyl radical production, with broad potential in environmental remediation and water purification technologies.
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