Carbon-supported TiO2–Au hybrids as catalysts for the electrogeneration of hydrogen peroxide: Investigating the effect of TiO2 shape

Reis, Flavia V. E. dos; Antonin, Vanessa S.; Hammer, Peter; Santos, Mauro C.; Camargo, Pedro H. C.

doi:10.1016/j.jcat.2015.04.007

Cited by 48 publications

(14 citation statements)

References 34 publications

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“…It is noteworthy that the Pt/TiO2-1/C sample presented the highest H2O2 production, which can also be attributed to the higher exposure of anatase TiO2 at the surface as a result of lower Pt coverage. 22,54 Our data indicate that the control over the Pt NPs coverage at the TiO2 surface significantly influences their electrocatalytic activities towards the ORR. In this case, rather than an increase in activity with the Pt loading, a volcano-type relationship was observed, in which the sample produced by two Pt deposition steps (Pt/TiO2-2/C) displayed the highest activities due to the equilibrium between optimum Pt loading/surface coverage and the presence of surface reactive sites as enabled by metal-support interactions.…”

Section: Resultsmentioning

confidence: 81%

“…Therefore, it can be anticipated that this material would generate the lowest amount of H2O2 during the reaction and lead to a higher ORR current density relative to the other samples (Pt/TiO2-1/C and Pt/TiO2-3/C). 22 The O 1s core level peaks for the Pt/TiO2/C materials are shown in Figure 2D. were characteristic of adsorbed water.…”

Section: Resultsmentioning

confidence: 99%

“…The higher activity of the Pt/TiO2-2/C material could be attributed to its lowest number of acidic oxygenated species at the surface as determined by XPS. These sites decrease the H2O2 formation thus enhancing the water production and the current on the disk relative to the other materials 22 . This material also displays less Pt NPs aggregation at the surface as compared to Pt/TiO2-3/C (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

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Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Barbosa

Parreira

Freitas

et al. 2019

ACS Appl. Energy Mater.

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Pt nanoparticles (Pt NPs) supported on carbon have been widely employed as electrocatalysts towards the oxygen reduction kinetics. The development of more efficient electrocatalysts that enable one to reduce or even not require the use of Pt is a central challenge. In addition to the control over Pt NPs physical and chemical features, metal-support interactions can be employed to enhance activities via the generation and exposure of surface-active sites. In this context, we report herein the development of electrocatalysts composed of Pt NPs supported on TiO2 microspheres, that were subsequently impregnated onto carbon. We have found that by optimizing the loading of Pt at the TiO2 surface, the electrocatalytic activity towards the ORR could be improved compared to the commercial Pt/C (E-TEK) material, even at lower Pt loadings. The enhancement in activities could be assigned to the balance between Pt loading and generation of reactive surface sites, such as adsorbed oxygenated species. Moreover, the utilization of TiO2 as support enabled improved stabilities relative to Pt/C (E-TEK). We believe that the results described herein may inspire the development of electrocatalysts for the ORR with improved activities and stabilities.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Barbosa

Parreira

Freitas

et al. 2019

ACS Appl. Energy Mater.

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“…3b, it is possible to see the C 1 s deconvoluted spectrum. The dominant peak at about 284.4 eV is assigned to graphitic carbon phase, whereas the peak at around 286 eV is related to hydrocarbons (C-H) from defects in the graphitic structure [54][55][56]. The peak at around 286.7 eV is related to the epoxy carbon, and at ~ 288 eV associated with the carbonyl carbon C=O [57].…”

Section: Resultsmentioning

confidence: 99%

Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Ferreira

Cavallari

Bergamaschi

et al. 2018

Mater Renew Sustain Energy

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Palladium nanoparticles supported on carbon Vulcan XC72 (Pd/C) and biocarbon (Pd/BC) synthesized by sodium borohydride process were used as catalysts for ethanol electro-oxidation in alkaline media. The biocarbon (BC) from coconut shell with mesoporous and high surface area (792 m 2 g −1) was obtained by carbonization at 900 °C and the hydrothermal treatment in a microwave oven. The D-band and G-band intensity ratio (I D /I G) from Raman analysis showed high disorder of the biocarbon, while X-ray photoelectron spectroscopy (XPS) suggests higher percentage of oxygen groups on the surface of biocarbon than of Vulcan XC72. From X-ray diffraction (XRD), it was observed peaks in 2θ degree related to the face centered cubic (fcc) structure of palladium and the mean crystallite sizes calculated based on the diffraction peak of Pd (220) were 5.6 nm for Pd/C and 5.3 nm for Pd/BC. Using Transmission Electron Microscope (TEM), it was observed particles well dispersed on both carbons support materials. The electrocatalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments. The peak current density (on CV experiments) from ethanol electro-oxidation on Pd/BC was 50% higher than on Pd/C, while the current density measured at 15 min of CA experiments was 80% higher on Pd/BC than on Pd/C. The higher catalytic activity of Pd/BC might be related to the large surface area of the biocarbon (792 m 2 g −1) vs (239 m 2 g −1) of Vulcan carbon, the defects of the biocarbon structure and higher amount of oxygen on the surface than Carbon Vulcan XC 72.

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“…Proton exchange membrane fuel cells (PEMFCs) have attracted considerable attention due to their high power density, low working temperature, and energy conversion efficiency. Although non-metal catalysts have recently been developed for PEMFCs, Pt remains an attractive candidate catalyst due to its considerable catalytic activity in both the anodic and cathodic reactions [1,2]. However, the application of Pt as a catalyst faces two major obstacles, namely degradation and low durability [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Structure of TiO2-Graphitic Carbon as a Support of Pt Nanoparticles for Catalyzing Oxygen Reduction Reaction

Jang

Kang

Hyun³

et al. 2021

Catalysts

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The durability of catalysts in fuel cells is a longstanding issue that needs to be resolved. Catalyst stability of the fuel cell has always been a problem, studies are underway to address them. Herein, to address this issue, we synthesize a hybrid structure consisting of SP carbon (SP) as the graphitic carbon and TiO2 as the metal oxide using a microwave method for use as a support for Pt nanoparticles. Anatase TiO2 and Pt nanoparticles with sizes of ~5 and 3.5 ± 1.4 nm, respectively, are uniformly dispersed on a modified graphitic SP carbon support (Pt-TiO2-SP). This supported Pt catalyst exhibits significantly improves durability in the oxygen reduction reaction (ORR). Furthermore, the Pt-TiO2-SP carbon hybrid catalyst manifests superior electrocatalytic stability and higher onset potential in ORR than those exhibited by Pt-SP carbon without TiO2. Pt-TiO2-SP exhibits an activity loss of less than 68 mV after 5000 electrochemical cycles, whereas an activity loss of ~100 mV is observed for Pt-SP carbon in a stability test. These results suggest that the strong metal–support interaction in TiO2-supported Pt catalyst significantly enhances the activity of Pt nanocatalyst.

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Carbon-supported TiO2–Au hybrids as catalysts for the electrogeneration of hydrogen peroxide: Investigating the effect of TiO2 shape

Cited by 48 publications

References 34 publications

Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Hybrid Structure of TiO2-Graphitic Carbon as a Support of Pt Nanoparticles for Catalyzing Oxygen Reduction Reaction

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Carbon-supported TiO2–Au hybrids as catalysts for the electrogeneration of hydrogen peroxide: Investigating the effect of TiO2 shape

Cited by 48 publications

References 34 publications

Pt-Decorated TiO2 Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Pt-Decorated TiO2 Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Hybrid Structure of TiO2-Graphitic Carbon as a Support of Pt Nanoparticles for Catalyzing Oxygen Reduction Reaction

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Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

Pt-Decorated TiO₂ Materials Supported on Carbon: Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading