Comparison of two different catalyst preparation methods for graphene nanoplatelets supported platinum catalysts

Daş, Elif; Gürsel, Selmiye Alkan; Şanlı, Lale Işıkel; Yurtcan, Ayşe Bayrakçeken

doi:10.1016/j.ijhydene.2016.01.111

Cited by 42 publications

(21 citation statements)

References 35 publications

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“…If the reaction rates of stages (5) and (6) are smaller than that of stage (4), CO will be the main reduction product. This hypothesis (stage 4 faster than stages 5 and 6) is quite likely considering that, unlike CO formation, the production of CH 4 requires the existence of charge carriers (holes and electrons) . Further, taking into account that the charge carriers can recombine, the selectivity towards CO (with respect to CH 4 ) will be larger if no action is taken (such as metal doping, enhanced morphology and crystallinity, etc.)…”

Section: Resultsmentioning

confidence: 99%

“…The purpose of this work is to assess the use of supercritical fluids in the synthesis of TiO 2 in order to improve catalyst characteristics such as surface, structure, and other physico‐chemical properties, together with its photocatalytic activity in the CO 2 photoreduction process. In this sense, it should be noticed that numerous researchers have synthesized, in supercritical media, catalysts with enhanced properties for several catalytic processes …”

Section: Introductionmentioning

confidence: 99%

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Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Camarillo

Tostón

Martínez

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Titanium dioxide is the photocatalyst par excellence in environmental applications. Nevertheless, over the years various methods aiming to improve its efficiency have been presented. Herein, we report that TiO2 synthesis in supercritical medium can result in a significant enhancement in the rate of CO2 photocatalytic conversion. RESULTS Specifically, catalysts obtained from two titanium precursors (titanium tetraisopropoxide and diisopropoxititanium bis(acetylacetonate)) and two alcohols (ethanol and isopropyl alcohol) by hydrothermal synthesis in supercritical CO2 are shown to exhibit improved properties in comparison with the standard reference catalyst (Degussa P‐25, Evonik). CONCLUSION In particular, upgraded characteristics are related to reactants adsorption (higher specific surface areas, presence of surface hydroxyl groups), light absorption and excitation (better absorbance in visible range, lower band gap energy), and charge separation (appropriate morphology and crystallinity). Furthermore, when these catalysts are tested in the photocatalytic reduction of CO2, CO and CH4 production rates 3‐ and 15.7‐fold higher than those corresponding to the commercial catalyst have been found. © 2016 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Camarillo

Tostón

Martínez

et al. 2017

J. Chem. Technol. Biotechnol

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“…Furthermore, CNTs have high SSA, high electrical conductivity, and excellent stability. CNTs are more stable than CBs in many cases . CNT has been used as a support material for PEMFCs due to these superior features.…”

Section: Introductionmentioning

confidence: 99%

“…These features have led researchers to believe that G may be a suitable catalyst support . It was observed in some studies that the performance of the G‐supported catalysts changes according to the synthesis method . For instance, Daş and his colleagues synthesized (GNP)‐supported Pt using two methods: microwave irradiation (Pt/GNP 1 ) and scCO 2 (supercritical carbon dioxide) deposition (Pt/GNP 2 ).…”

Section: Introductionmentioning

confidence: 99%

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Performance of an HT‐PEMFC having a catalyst with graphene and multiwalled carbon nanotube support

2019

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Summary In this study, the effect of multiwalled carbon nanotube and graphene nanoplatelet‐based catalyst supports on the performance of reformate gas‐fed polybenzimidazole (PBI)‐based high‐temperature proton exchange membrane fuel cell (HT‐PEMFC) was investigated. In addition, the effect of several microwave conditions on the performance of the Pt‐Ru/multiwalled carbon nanotube (MWCNT)–graphene nanoplatelet (GNP) catalyst was assessed. Through X‐ray diffraction, thermal gravimetric analysis, transmission electron microscopy, scanning electron microscopy, and energy dispersive spectroscopy, the catalysts' chemical structure and morphology were characterized. Cyclic voltammetry analysis was used for the electrochemical characterization of catalysts through an electrochemical cell with three electrodes connected to a potentiostat. The results showed that the best performing catalyst is the catalyst produced using 800‐W power for 40 seconds. The electrochemically active surface area values of this catalyst ranged from 54 to 45 m2/g. Single‐cell performance tests of the HT‐PEMFC were then carried out. In these tests, reformate gas mixture, consisting of H2, CO2, and CO, was fed to the anode side at 160°C without humidification. These tests for the best performing catalyst yielded peak power density of 0.280 W/cm2 and current density (at 0.6 V) of 0.180 A/cm2 in the H2/air environment and peak power density of 0.266 W/cm2 and current density (at 0.6 V) of 0.171 A/cm2 in the reformate gas/air environment. As a result of the experiments, it was found that Pt‐Ru/MWCNT‐GNP hybrid material is a suitable catalyst for HT‐PEMFC.

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Electrocatalytical Application of Platinum Nanoparticles Supported on Reduced Graphene Oxide in PEM Fuel Cell: Effect of Reducing Agents of Dimethlyformamide or Hydrazine Hydrate on the Properties

2021

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Two kinds of reduced graphene oxide (rGO) were synthesized with the reducing agents of either dimethylformamide (DMF) or hydrazine hydrate (HYD). The decoration of platinum nanoparticles (Pt NPs) over these materials was provided by microwave irradiation (MWI) method. Detailed physical and electrochemical measurements were carried out. Based on the electrochemical results of both catalysts, it is not surprising the achievement of higher electrochemical active surface area (ECSA), higher oxygen reduction reaction (ORR) activity, higher electron transfer number, lower charge transfer resistance and higher fuel cell performance with the Pt/rGO (DMF) catalyst which surpasses Pt/rGO (HYD) in many ways.

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Comparison of two different catalyst preparation methods for graphene nanoplatelets supported platinum catalysts

Cited by 42 publications

References 35 publications

Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Performance of an HT‐PEMFC having a catalyst with graphene and multiwalled carbon nanotube support

Electrocatalytical Application of Platinum Nanoparticles Supported on Reduced Graphene Oxide in PEM Fuel Cell: Effect of Reducing Agents of Dimethlyformamide or Hydrazine Hydrate on the Properties

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Comparison of two different catalyst preparation methods for graphene nanoplatelets supported platinum catalysts

Cited by 42 publications

References 35 publications

Preparation of TiO2-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO2reduction

Preparation of TiO2-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO2reduction

Performance of an HT‐PEMFC having a catalyst with graphene and multiwalled carbon nanotube support

Electrocatalytical Application of Platinum Nanoparticles Supported on Reduced Graphene Oxide in PEM Fuel Cell: Effect of Reducing Agents of Dimethlyformamide or Hydrazine Hydrate on the Properties

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Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction