Search results for: Ernesto R. Gonzalez

Items from 1 to 20 out of 51 results

article

Oxygen Reduction on Methanol-Tolerant Carbon-Supported Pt_xS_y Nanoparticles Prepared by a Single-Step Low-Temperature Method

Emilia A. Carbonio, Ubirajara P. Rodrigues-Filho, Alexandre Mesquita, Richard Landers, more

Electrocatalysis > 2019 > 10 > 5 > 516-523

In direct methanol fuel cells (DMFCs), the methanol crossover from the anode to the cathode is a major cause of power density loss because of the overpotential arising due to the parasitic reaction of methanol oxidation at the cathode. Catalysts modified with S have shown better methanol tolerance; however, the preparation routes often require high temperatures or pressures and very long times, making...

article

Stationary and Damped Oscillations in a Direct Formic Acid Fuel Cell (DFAFC) using Pt/C

Andressa Mota-Lima, Djalma R. Silva, Luiz H.S. Gasparotto, Ernesto R. Gonzalez

Electrochimica Acta > 2017 > 235 > C > 135-142

Herein, we report damped and stationary oscillations during Formic Acid oxidation (FAO) under galvanostatic control in a Direct Formic Acid fuel cell (DFAFC). Using Pt/C catalyst in a practical DFAFC, the anodic electrode are allowed to rise its potential up to 600mV, at the most, which, in turn leads to solely presence of damped oscillations during FAO. When employing dynamic hydrogen electrode (DHE)...

article

Energy recovery from winery wastewater using a dual chamber microbial fuel cell

Eduardo D Penteado, Carmen M Fernandez‐Marchante, Marcelo Zaiat, Pablo Cañizares, more

Journal of Chemical Technology & Biotechnology > 91 > 6 > 1802 - 1808

BACKGROUNDMicrobial fuel cells (MFCs) can treat agro‐industrial wastewater, but only a few studies have reported the treatment of winery waste and much work is needed in order to develop this interesting application of MFC technology, in particular in evaluating how the unfavorable COD/N and COD/P ratios may affect the MFC performance. In this work, a dual chamber MFC was used to treat real effluents...

article

Investigation of PtNi/C as methanol tolerant electrocatalyst for the oxygen reduction reaction

Sabrina C. Zignani, Vincenzo Baglio, David Sebastián, Thairo A. Rocha, more

Journal of Electroanalytical Chemistry > 2016 > 763 > C > 10-17

Platinum–nickel electrocatalysts prepared by a simple and cost-effective procedure have been investigated for the oxygen reduction reaction (ORR) in direct methanol fuel cells (DMFCs). The formic acid method was used to deposit well-dispersed Pt_xNi_y nanoparticles (x:y=3:2) on the surface of a carbon black support (Ketjenblack). Carbothermal reduction of the as-prepared catalyst in an inert gas (Ar)...

article

In situ FTIR spectroscopic study of ethanol oxidation on Pt(111)/Rh/Sn surface. The anion effect

Marcia E. Paulino, Luiza M.S. Nunes, Ernesto R. Gonzalez, Germano Tremiliosi-Filho

Electrochemistry Communications > 2015 > 52 > C > 85-88

In situ Fourier Transform Infrared (FTIR) spectroscopy was used to study the anion effect in ethanol oxidation on Pt (111) surface modified by rhodium and tin, Pt(111)/Rh/Sn. The in situ FTIR spectra showed that ethanol oxidation reaction pathway is strongly influenced by the nature of the electrolyte anion. In perchloric and sulfuric acid electrolytes were observed the formation of acetaldehyde,...

article

Different anode catalyst for high temperature polybenzimidazole-based direct ethanol fuel cells

José J. Linares, Thairo A. Rocha, Sabrina Zignani, Valdecir A. Paganin, more

International Journal of Hydrogen Energy > 2013 > 38 > 1 > 620-630

Five different bimetallic catalyst formulations (PtRu/C, PtSn/C, PtW/C, PtRh/C and PtOs/C) were prepared by reduction with sodium borohydride, and physico-chemically characterized by X-Ray Diffraction, Transmission Electron Microscopy, Temperature Programmed Reduction and X-Ray Photoelectron Spectroscopy. It was observed that in the case of the PtRu/C and PtRh/C a large fraction of the second metal...

article

The electro-oxidation of carbon monoxide and ethanol on supported Pt nanoparticles: the influence of the support and catalyst microstructure

Eduardo G. Ciapina, Sydney F. Santos, Ernesto R. Gonzalez

Journal of Solid State Electrochemistry > 2013 > 17 > 7 > 1831-1842

The sluggish kinetics of ethanol oxidation on Pt-based electrodes is one of the major drawbacks to its use as a liquid fuel in direct ethanol fuel cells, and considerable efforts have been made to improve the reaction kinetics. Herein, we report an investigation on the effect of the Pt microstructure (well-dispersed versus agglomerated nanoparticles) and the catalyst support (carbon Vulcan, SnO₂,...

article

Ethanol oxidation on a high temperature PBI-based DEFC using Pt/C, PtRu/C and Pt₃Sn/C as catalysts

José J. Linares, Sabrina C. Zignani, Thairo A. Rocha, Ernesto R. Gonzalez

Journal of Applied Electrochemistry > 2013 > 43 > 2 > 147-158

A high temperature ethanol-fed polymer electrolyte membrane fuel cell has been implemented by using H₃PO₄-doped m-polybenzimidazole as polymeric electrolyte. Commercial Pt/C, PtRu/C and Pt₃Sn/C catalysts are used in the anode. The performance was assessed in terms of polarization curves at different temperatures, feeding the cell with a high concentration ethanol solution (water/ethanol mass ratio...

article

Nb as an influential element for increasing the CO tolerance of PEMFC catalysts

Thairo A. Rocha, Felipe Ibanhi, Flávio Colmati, José J. Linares, more

Journal of Applied Electrochemistry > 2013 > 43 > 8 > 817-827

Platinum–niobium catalysts were prepared as candidates for CO tolerant anode catalysts for low and high temperature PEM fuel cells (PEMFCs). Three different compositions were prepared by the formic acid method, from platinum (hexachloroplatinic acid) and niobium (niobium chloride) precursors on Vulcan XC-72R carbon black. Deposition of the niobium was found to be quite difficult, and only a fraction...

article

Development of paper based electrodes: From air-breathing to paintable enzymatic cathodes

Gustavo P.M.K. Ciniciato, Carolin Lau, Andrew Cochrane, Scott S. Sibbett, more

Electrochimica Acta > 2012 > 82 > Complete > 208-213

This work presents the results from the development of bio-cathodes for the application on paper-based biofuel cells. Our main goal here is to demonstrate the possibility of using different designs of air-breathing bio-cathodes and ink-based bio-cathodes for this new type of paper based electrochemical cell. The electrochemical performance for the bio-electrocatalytic oxygen reduction reaction was...

article

Performance and selectivity of PtxSn/C electro-catalysts for ethanol oxidation prepared by reduction with different formic acid concentrations

Sabrina C. Zignani, Vincenzo Baglio, José J. Linares, Giuseppe Monforte, more

Electrochimica Acta > 2012 > 70 > Complete > 255-265

Carbon supported Pt–Sn catalysts were prepared by reduction of Pt and Sn precursors with formic acid and characterized in terms of structure, morphology and surface properties. The electrocatalytic activity for ethanol oxidation was studied in a direct ethanol fuel cell (DEFC) at 70°C and 90°C. Electrochemical and physico-chemical data indicated that a proper balance of Pt and Sn species in the near...

article

Performance of a poly(2,5-benzimidazole)-based polymer electrolyte membrane fuel cell

José J. Linares, Cassandra Sanches, Valdecir A. Paganin, Ernesto R. Gonzalez

International Journal of Hydrogen Energy > 2012 > 37 > 8 > 7212-7220

The performance of an ABPBI-based High Temperature H ₂ /O ₂ PEMFC system was studied under different experimental conditions. Increasing the temperature from 130 to 170 °C improved the cell performance, even though further increase was not beneficial for the system. Humidification of the H ₂ stream ameliorated this behaviour, even though operating above 170 °C is not advisable...

article

Kinetic Insights over a PEMFC Operating on Stationary and Oscillatory States

Andressa Mota, Ernesto R. Gonzalez, Markus Eiswirth

The Journal of Physical Chemistry A > 2011 > 115 > 47 > 13773 - 13782

article

Hydrogen sulfide tolerance of palladium–copper catalysts for PEM fuel cell anode applications

Thiago Lopes, Valdecir A. Paganin, Ernesto R. Gonzalez

International Journal of Hydrogen Energy > 2011 > 36 > 21 > 13703- 13707

The H ₂ S-tolerance of Palladium–Copper nanoparticle catalysts supported on carbon black employed on PEMFC anodes operating on H ₂ S-contaminated anode feeding streams is described. The anode feeding consists of 80% H ₂ , ∼20% N ₂ (in vol.), and 8 ppm H ₂ S. Catalyst performances were evaluated by estimating the cell potential reduction due to H ₂ S...

article

The effects of hydrogen sulfide on the polymer electrolyte membrane fuel cell anode catalyst: H2S–Pt/C interaction products

Thiago Lopes, Valdecir A. Paganin, Ernesto R. Gonzalez

Journal of Power Sources > 2011 > 196 > 15 > 6256-6263

The performance of a polymer electrolyte membrane fuel cell (PEMFC) operating on a simulated hydrocarbon reformate is described. The anode feed stream consisted of 80% H ₂ , ∼20% N ₂ , and 8ppm hydrogen sulfide (H ₂ S). Cell performance losses are calculated by evaluating cell potential reduction due to H ₂ S contamination through lifetime tests. It is found that potential,...

article

Triphenylmethane dyes, an alternative for mediated electronic transfer systems in glucose oxidase biofuel cells

Camilo E. La Rotta H., Gustavo P.M.K. Ciniciato, Ernesto R. González

Enzyme and Microbial Technology > 2011 > 48 > 6-7 > 487-497

The bioelectrochemical behavior of three triphenylmethane (TPM) dyes commonly used as pH indicators, and their application in mediated electron transfer systems for glucose oxidase bioanodes in biofuel cells was investigated. Bromophenol Blue, Bromothymol Blue, Bromocresol Green were compared bioelectrochemically against two widely used mediators, benzoquinone and ferrocene carboxy aldehyde. Biochemical...

article

Palladium-based electrodes: A way to reduce platinum content in polymer electrolyte membrane fuel cells

Ermete Antolini, Sabrina C. Zignani, Sydney F. Santos, Ernesto R. Gonzalez

Electrochimica Acta > 2011 > 56 > 5 > 2299-2305

To decrease the Pt content, a polymer electrolyte membrane fuel cell (PEMFC) was formed using a carbon supported Pd ₉₆ Pt ₄ catalyst as the anode material, and a carbon supported Pd ₄₉ Pt ₄₇ Co ₄ catalyst as the cathode material. The as-obtained Pd-based PEMFC with an overall Pd:Pt:Co atomic composition of electrodes (anode+cathode)=72:26:2 exhibited a performance...

article

A simple model to assess the contribution of alloyed and non-alloyed platinum and tin to the ethanol oxidation reaction on Pt–Sn/C catalysts: Application to direct ethanol fuel cell performance

Ermete Antolini, Ernesto R. Gonzalez

Electrochimica Acta > 2010 > 55 > 22 > 6485-6490

A simple model is proposed to evaluate the contribution of alloyed and non-alloyed platinum and tin to the ethanol oxidation reaction on Pt–Sn/C catalysts for direct ethanol fuel cells. On the basis of the model, the ethanol oxidation on partially alloyed catalysts occurs through a dual pathway mechanism, separately involving the Pt ₃ Sn phase and Pt–SnO _x . The model, validated by...

article

Tungsten-based materials for fuel cell applications

Ermete Antolini, Ernesto R. Gonzalez

Applied Catalysis B: Environmental > 2010 > 96 > 3-4 > 245-266

Tungsten-based materials can play different roles in fuel cell systems. They are the only compounds which can be used as catalysts, co-catalysts, catalyst supports and electrolytes in different types of fuels cells. In particular, tungsten-based materials fulfill the requirements for their use as thermally stable carbon-alternative catalyst supports and Nafion ^® -alternative proton conducting...

article

The electrooxidation of carbon monoxide on unsupported Pt agglomerates

Eduardo G. Ciapina, Sydney F. Santos, Ernesto R. Gonzalez

Journal of Electroanalytical Chemistry > 2010 > 644 > 2 > 132-143

This work presents some insights on the CO electrooxidation on unsupported Pt nanoparticles in terms of the role played by particle size, surface crystallography, and defects, based on the results of structural and electrochemical characterization. The electrochemical properties were probed through potentiodynamic and potentiostatic CO-stripping experiments conducted in two samples of unsupported...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: Ernesto R. Gonzalez

Oxygen Reduction on Methanol-Tolerant Carbon-Supported Pt_xS_y Nanoparticles Prepared by a Single-Step Low-Temperature Method

Stationary and Damped Oscillations in a Direct Formic Acid Fuel Cell (DFAFC) using Pt/C

Energy recovery from winery wastewater using a dual chamber microbial fuel cell

Investigation of PtNi/C as methanol tolerant electrocatalyst for the oxygen reduction reaction

In situ FTIR spectroscopic study of ethanol oxidation on Pt(111)/Rh/Sn surface. The anion effect

Different anode catalyst for high temperature polybenzimidazole-based direct ethanol fuel cells

The electro-oxidation of carbon monoxide and ethanol on supported Pt nanoparticles: the influence of the support and catalyst microstructure

Ethanol oxidation on a high temperature PBI-based DEFC using Pt/C, PtRu/C and Pt₃Sn/C as catalysts

Nb as an influential element for increasing the CO tolerance of PEMFC catalysts

Development of paper based electrodes: From air-breathing to paintable enzymatic cathodes

Performance and selectivity of PtxSn/C electro-catalysts for ethanol oxidation prepared by reduction with different formic acid concentrations

Performance of a poly(2,5-benzimidazole)-based polymer electrolyte membrane fuel cell

Kinetic Insights over a PEMFC Operating on Stationary and Oscillatory States

Hydrogen sulfide tolerance of palladium–copper catalysts for PEM fuel cell anode applications

The effects of hydrogen sulfide on the polymer electrolyte membrane fuel cell anode catalyst: H2S–Pt/C interaction products

Triphenylmethane dyes, an alternative for mediated electronic transfer systems in glucose oxidase biofuel cells

Palladium-based electrodes: A way to reduce platinum content in polymer electrolyte membrane fuel cells

A simple model to assess the contribution of alloyed and non-alloyed platinum and tin to the ethanol oxidation reaction on Pt–Sn/C catalysts: Application to direct ethanol fuel cell performance

Tungsten-based materials for fuel cell applications

The electrooxidation of carbon monoxide on unsupported Pt agglomerates

Filter options

Publication date

Content availability

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Ernesto R. Gonzalez

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options