Search results for: Ermete Antolini

Items from 1 to 20 out of 58 results

article

Photo-assisted methanol oxidation on Pt-TiO2 catalysts for direct methanol fuel cells: A short review

Ermete Antolini

Applied Catalysis B: Environmental > 2018 > 237 > C > 491-503

Platinum and platinum-based electrocatalysts for the methanol oxidation reaction (MOR) are commonly used as the anode material in direct methanol fuel cells (DMFCs). Photo-oxidation promoted by ultraviolet and visible light is a promising method to increase the catalytic activity of DMFC anode electrocatalysts. Photocatalytic and electrocatalytic methanol oxidation can be coupled by addition of TiO...

article

The oxygen reduction on Pt‐Ni and Pt‐Ni‐M catalysts for low‐temperature acidic fuel cells: A review

Ermete Antolini

International Journal of Energy Research > 42 > 12 > 3747 - 3769

For its wide availability and low cost, nickel is a promising candidate to be used as a cocatalyst in Pt‐based catalysts for proton exchange membrane fuel cells. Among Pt‐M (M = transition metal) catalysts for oxygen reduction, Pt‐Ni is the one which can be used in various forms, that is, as disordered Pt_1‐xNi_x solid solutions, ordered intermetallic phases, octahedral‐shaped structures (with a preferential...

article

Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium

Vanessa M. F. Araujo, Ermete Antolini, Leandro A. Pocrifka, Raimundo R. Passos

Electrocatalysis > 2018 > 9 > 6 > 673-681

Binary and ternary Pt₇₅Co_xNi_25-x/C (x = 0, 0.9, 12.5, 24.1, and 25) electrocatalysts were prepared by a polyol method, and their activity for carbon monoxide and glycerol oxidation in alkaline media was compared to that of a conventional Pt/C catalyst. Formation of partially alloyed catalysts was detected by XRD analysis, with the most part of the non-precious metals in a non-alloyed form. The onset...

article

Alloy vs. intermetallic compounds: Effect of the ordering on the electrocatalytic activity for oxygen reduction and the stability of low temperature fuel cell catalysts

Ermete Antolini

Applied Catalysis B: Environmental > 2017 > 217 > C > 201-213

The application of intermetallic compounds in heterogeneous catalysis had a significant boost during the last decade. Notwithstanding the advantages related to the use of intermetallics in catalysis, random alloys, more easy to prepare, are commonly used as catalysts in low temperature polymer electrolyte membrane fuel cells (LT-PEMFC). In various papers, however, the use of Pt- and Pd-based intermetallics...

article

Nitrogen-doped carbons by sustainable N- and C-containing natural resources as nonprecious catalysts and catalyst supports for low temperature fuel cells

Ermete Antolini

Renewable and Sustainable Energy Reviews > 2016 > 58 > C > 34-51

Nitrogen-doped carbon materials represent a significant part in the field of energy conversion and storage technologies such as proton exchange membrane fuel cells and supercapacitors. The achievement of these materials by sustainable N- and C-containing natural resources using various methods, such as pyrolysis, hydrothermal and ionothermal carbonization is presented. The application of these novel...

article

Structural parameters of supported fuel cell catalysts: The effect of particle size, inter-particle distance and metal loading on catalytic activity and fuel cell performance

Ermete Antolini

Applied Catalysis B: Environmental > 2016 > 181 > C > 298-313

Carbon supported platinum is commonly used as anode and cathode catalyst in low-temperature fuel cells. The need of modify the chemical characteristics of the supported catalyst has emerged due to several factors, such as reducing the price of the active catalyst and increasing its activity, selectivity, and long-term stability. Thus, pure Pt is now rapidly being replaced by oxide promoted Pt and...

chapter

Graphene as a Support for ORR Electrocatalysts

Ermete Antolini

Nanocarbons for Advanced Energy Conversion > 149 - 176

On the basis of their high surface area, high conductivity, unique graphitized basal plane structure, and potential low manufacturing cost, graphene nanosheets have been investigated as a support for low‐temperature fuel cell catalysts. This chapter presents an overview of graphene nanosheets used as supports for oxygen reduction catalysts. The catalytic activity and durability of graphene‐supported...

article

Composite materials for polymer electrolyte membrane microbial fuel cells

Ermete Antolini

Biosensors and Bioelectronics > 2015 > 69 > Complete > 54-70

Recently, the feasibility of using composite metal–carbon, metal–polymer, polymer–carbon, polymer–polymer and carbon–carbon materials in microbial fuel cells (MFCs) has been investigated. These materials have been tested as MFC anode catalyst (microorganism) supports, cathode catalysts and membranes. These hybrid materials, possessing the properties of each component, or even with a synergistic effect,...

article

Electro-oxidation of ethanol on ternary Pt–Sn–Ce/C catalysts

Juliana M. Jacob, Patricia G. Corradini, Ermete Antolini, Nathalia Abe Santos, more

Applied Catalysis B: Environmental > 2015 > 165 > C > 176-184

Ternary Pt–Sn–Ce/C catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared to that of Pt–Sn/C, Pt–Ce/C and Pt/C catalysts. No bulk alloy formation was detected by XRD analysis. XPS measurements indicated no segregation on the catalyst surface and the presence of Sn(0) and SnO_x, Ce₂O₃ and CeO₂ oxides. The onset potential for...

article

Electro-oxidation of ethanol on ternary non-alloyed Pt–Sn–Pr/C catalysts

Patricia G. Corradini, Ermete Antolini, Joelma Perez

Journal of Power Sources > 2015 > 275 > C > 377-383

Ternary Pt–Sn–Pr/C (70:10:20), (70:15:15) and (45:45:10) electro-catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared with that of Pt–Pr/C catalysts prepared by the same methods and that of commercial Pt–Sn/C (75:25) and Pt/C catalysts. Among all the catalysts, the Pt–Sn–Pr/C (45:45:10) catalyst presented both the highest...

article

Ethanol electro-oxidation on partially alloyed Pt-Sn-Rh/C catalysts

Elson A. de Souza, M.Janete Giz, Giuseppe A. Camara, Ermete Antolini, more

Electrochimica Acta > 2014 > 147 > C > 483-489

Ternary Pt-Sn-Rh/C catalysts of Pt:Sn:Rh=1:0.8:0.2 and 1:1:0.33 atomic ratios were synthesized using the formic acid method and their electrochemical activities were compared for ethanol oxidation with that of binary Pt-Sn/C (1:1) and Pt-Rh/C (1:0.11) catalysts. XRD analysis indicated the presence of Sn in both alloyed and oxide form and suggested the formation of a ternary Pt-Sn-Rh alloy in both...

article

Influence of operational parameters on the performance of PEMFCs with serpentine flow field channels having different (rectangular and trapezoidal) cross-section shape

Luciana S. Freire, Ermete Antolini, Marcelo Linardi, Elisabete I. Santiago, more

International Journal of Hydrogen Energy > 2014 > 39 > 23 > 12052- 12060

The effect of operational parameters on the performance of PEMFCs by using serpentine flow field channels with different (rectangular and trapezoidal) cross-section shape has been investigated. More than cell temperature and pressure, reactant humidification temperature (T _ha,c ) has a significant influence on the effect of serpentine channels with trapezoidal cross-section on cell performance...

article

Activity, short-term stability (poisoning tolerance) and durability of carbon supported Pt–Pr catalysts for ethanol oxidation

Patricia G. Corradini, Ermete Antolini, Joelma Perez

Journal of Power Sources > 2014 > 251 > C > 402-410

Pt–Pr/C electrocatalysts were prepared by a modified formic acid method, and their activity for carbon monoxide and ethanol oxidation, their short term stability and durability were compared to that of commercial Pt/C and Pt–Sn/C (3:1) catalysts. By derivative voltammetry (DV) it was found that ethanol electro-oxidation takes place by two main pathways at different potentials. It was observed that,...

article

The stability of LiAlO2 powders and electrolyte matrices in molten carbonate fuel cell environment

Ermete Antolini

Ceramics International > 2013 > 39 > 4 > 3463-3478

The stability of LiAlO ₂ electrolyte matrix is a key issue for the development of molten carbonate fuel cells (MCFCs). The phase transformation and particle growth of LiAlO ₂ particles, observed after a long period of cell operation, is a serious problem and must be overcome in order to attain more than 40,000h of MCFC life. This process is accompanied by pore size increase of the...

article

Effect of the degree of alloying of PtRu/C (1:1) catalysts on ethanol oxidation

Felipe I. Pires, Patricia G. Corradini, Valdecir A. Paganin, Ermete Antolini, more

Ionics > 2013 > 19 > 7 > 1037-1045

The effect of alloying degree on the ethanol oxidation activity of a PtRu/C catalyst with a Pt/Ru atomic ratio of 1:1 was investigated by measurements in a half-cell and in a single direct ethanol fuel cell. The increase of the amount of Ru alloyed from one third to two thirds of the total Ru content in the catalyst clearly resulted in a decrease of the ethanol oxidation activity. As the amount of...

article

Graphene as a new carbon support for low-temperature fuel cell catalysts

Ermete Antolini

Applied Catalysis B: Environmental > 2012 > 123-124 > Complete > 52-68

Highly dispersed catalysts on a conductive support, commonly platinum and platinum-based catalysts, are used as electrode materials in low-temperature fuel cells. Carbon blacks are commonly used as fuel cell catalysts supports, but their properties are not completely satisfactory. Thus, in the last years carbon black alternative materials such as nanostructured carbons, ceramic and polymer materials...

article

Effect of the relationship between particle size, inter-particle distance, and metal loading of carbon supported fuel cell catalysts on their catalytic activity

Patricia Gon Corradini, Felipe I. Pires, Valdecir A. Paganin, Joelma Perez, more

Journal of Nanoparticle Research > 2012 > 14 > 9 > 1-9

The effect of the relationship between particle size (d), inter-particle distance (x _i), and metal loading (y) of carbon supported fuel cell Pt or PtRu catalysts on their catalytic activity, based on the optimum d (2.5–3 nm) and x _i/d (>5) values, was evaluated. It was found that for y < 30 wt%, the optimum values of both d and x _i/d can be always obtained. For y ≥ 30 wt%, instead, the...

article

The stability of molten carbonate fuel cell electrodes: A review of recent improvements

Ermete Antolini

Applied Energy > 2011 > 88 > 12 > 4274-4293

The electrode stability is a key issue for the development of conventional hydrogen fuelled and direct internal reforming (DIR) molten carbonate fuel cells (MCFCs). While for conventional MCFC anodes the stability problem has been addressed by the addition of Al or Cr to Ni, the problems of the dissolution of the NiO cathode and of the deactivation of DIR-MCFC anodes have not been fully resolved too...

article

The use of rare earth-based materials in low-temperature fuel cells

Ermete Antolini, Joelma Perez

International Journal of Hydrogen Energy > 2011 > 36 > 24 > 15752- 15765

Rare earth-based materials can play different roles in fuel cell systems. These compounds can be used as catalysts, co-catalysts and electrolytes additives in different types of fuels cells. In particular, a promising acid direct methanol fuel cell can be obtained using rare earth-based materials as both anode and cathode co-catalysts and proton exchange membrane additive. In this work an overview...

article

An empirical model to evaluate the contribution of alloyed and non-alloyed tin to the ethanol oxidation reaction on Pt-Sn/C catalysts based on the presence of SnO2 and a Pt(1−x)Snx solid solution: Application to DEFC performance

Ermete Antolini

International Journal of Hydrogen Energy > 2011 > 36 > 17 > 11043- 11047

An empirical model is proposed to evaluate the contribution of alloyed and non-alloyed tin in Pt _z -Sn/C catalysts to the performance of direct ethanol fuel cells (DEFCs). The model is based on the presence of SnO ₂ and a Pt _(1−x) S _x solid solution in the bimetallic catalysts. The model predicts the dependence of the performance of a single DEFC on the total Sn content...

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Search results for: Ermete Antolini

Photo-assisted methanol oxidation on Pt-TiO2 catalysts for direct methanol fuel cells: A short review

The oxygen reduction on Pt‐Ni and Pt‐Ni‐M catalysts for low‐temperature acidic fuel cells: A review

Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium

Alloy vs. intermetallic compounds: Effect of the ordering on the electrocatalytic activity for oxygen reduction and the stability of low temperature fuel cell catalysts

Nitrogen-doped carbons by sustainable N- and C-containing natural resources as nonprecious catalysts and catalyst supports for low temperature fuel cells

Structural parameters of supported fuel cell catalysts: The effect of particle size, inter-particle distance and metal loading on catalytic activity and fuel cell performance

Graphene as a Support for ORR Electrocatalysts

Composite materials for polymer electrolyte membrane microbial fuel cells

Electro-oxidation of ethanol on ternary Pt–Sn–Ce/C catalysts

Electro-oxidation of ethanol on ternary non-alloyed Pt–Sn–Pr/C catalysts

Ethanol electro-oxidation on partially alloyed Pt-Sn-Rh/C catalysts

Influence of operational parameters on the performance of PEMFCs with serpentine flow field channels having different (rectangular and trapezoidal) cross-section shape

Activity, short-term stability (poisoning tolerance) and durability of carbon supported Pt–Pr catalysts for ethanol oxidation

The stability of LiAlO2 powders and electrolyte matrices in molten carbonate fuel cell environment

Effect of the degree of alloying of PtRu/C (1:1) catalysts on ethanol oxidation

Graphene as a new carbon support for low-temperature fuel cell catalysts

Effect of the relationship between particle size, inter-particle distance, and metal loading of carbon supported fuel cell catalysts on their catalytic activity

The stability of molten carbonate fuel cell electrodes: A review of recent improvements

The use of rare earth-based materials in low-temperature fuel cells

An empirical model to evaluate the contribution of alloyed and non-alloyed tin to the ethanol oxidation reaction on Pt-Sn/C catalysts based on the presence of SnO2 and a Pt(1−x)Snx solid solution: Application to DEFC performance

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