Electrocatalytic Materials
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Perovskite-Type Oxides La0.6M0.4Ni0.6Cu0.4O3 (M = Ag, Ba, Ce) towards the Oxygen Reduction Reaction (ORR) in Alkaline Medium: Structural Aspects and Electrocatalytic Activity
In this work, La0.6M0.4Ni0.6Cu0.4O3 (M = Ag, Ba, and Ce, denoted as LANC, LBNC, and LCNC, respectively) electrocatalysts were synthesized by the Pechini method at 1023 K for two hours in air. Rietveld refinement allowed the identification of the crystallographic phases present in all oxides. The electrocatalytic performance of these oxides towards the oxygen
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. BDD-Electrolysis of Oxalic Acid in Diluted Acidic Solutions
Boron doped diamond films (BDD) are the most studied electrocatalytic materials and their efficiency for removing organic compounds is attributed to their ability to produce a large amount of hydroxyl radicals by the electrolysis of water. However, some organic compounds are easy to degrade than others, as well as they also interact with BDD surface. Thus, i
J. Braz. Chem. Soc.. Publicado em: 04/07/2019
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3. Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography
The carbon dioxide electrocatalytic reduction is central for the development of regenerative cycles of electrochemical energy conversion and storage. Herein, the gaseous products of the CO2 electroreduction were monitored by using an electrochemical cell on line coupled to a differential electrochemical mass spectrometer (DEMS), aiming at searching for elect
J. Braz. Chem. Soc.. Publicado em: 2017-09
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4. CuO Nanofibers Immobilized on Paraffin-Impregnated Graphite Electrode and its Application in the Amperometric Detection of Glucose
1-D nanostructures are promising materials for development of electrochemical devices offering benefits such as fast electron transfer rates and large surface areas. Copper oxide nanofibers (CuO-NFs) synthesized by electrospinning technique and subsequent thermal treatment, were used to modify paraffin-impregnated graphite electrode (PIGE) for a sensitive
J. Braz. Chem. Soc.. Publicado em: 2015-08
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5. Síntese e estudo da atividade eletrocatalítica de óxidos de metais de transição e de nanopartículas de prata e ouro para a reação de redução de oxigênio / Synthesis and study of the electrocatalytic activity of transition metal oxides, and silver and gold nanoparticles for the oxygen reduction reaction
The oxygen reduction reaction (ORR) was studied on electrocatalysts composed by pure and mixed transition metal oxides of Mn, Co, and Ni, including spinel-like structures, and by Ag, Au, and Ag3M/C (M= Au, Pt, Pd e Cu) bimetallic nanoparticles, in alkaline electrolyte. The transition metal oxides were synthesized by thermal decomposition of their nitrates, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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6. Aplicação da tecnologia eletroquímica como alternativa para a remoção de corante têxteis em efluentes sintéticos e reais utilizando anodos de platina e diamante
Neste trabalho, a tecnologia eletroquímica foi utilizada no tratamento de efluentes sintéticos, contendo Vermelho de Metila (VM) e Azul de Novacron (AN), através da oxidação anódica utilizando ânodos de Ti recoberto com platina (Ti/Pt). Após isso, a fim de verificar a aplicabilidade do tratamento eletroquímico, amostras reais de efluentes têxteis u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/07/2011
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7. Tecnologia eletroquímica como tratamento alternativo de efluentes têxteis sintéticos utilizando ânodos de platina e diamante
Neste trabalho, o tratamento de efluentes sintéticos, contendo Vermelho de Remazol BR (RRB) e Azul de Novacron CD (NB) por oxidação anódica com ânodos de Diamante Dopado com Boro (BDD) e Amarelo de Novacron (YN) com ânodo de Platina (Pt) e DDB foram investigados. A eletrólise galvanostática dos efluentes sintéticos RRB, NB e YN têm levado à remoç
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/01/2011
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8. Redução do Oxigênio Molecular por [Fe(Bipy)3]/C: influência do suporte e do tratamento térmico na atividade catalítica. / Reduction of the Molecular Oxygen for [Faith (Bipy) 3] /C: influence of the support and the thermal treatment in the catalytic activity.
This work consisted in the preparation and study of catalytic activity for reduction of molecular oxygen (ROM) based on head-treated coordination compounds with nitrogenated ligands, impregnated on carbon nanosupports (nanotube - NTC, and nanoparticles - Vulcan). The following ions complexes [Fe(bipy)3]2+ and [Fe(TPTZ)2]2+ (2,2 -bipyridine and 2 ,4,6-tris (2
Publicado em: 2011
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9. Materiais nanoestruturados baseados em Pt e Sn para células a combustível de etanol direto / Nanostructured materials based on Pt and Sn for Direct Ethanol Fuel Cells
This work presents the synthesis, characterization and performance of different electrocatalysts for Direct Ethanol Fuel Cells (DEFC). As cathode applications in DEFC it was synthesized a Pt3Sn/C alloy (20% metal w/w on carbon) by the polymeric precursor method (PPM) with 90% of alloy degree and particle sizes lower than 10%. Its performance using Pt3Sn/C as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/09/2010
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10. Estudos da reação de oxidação de hidrogênio na presença de CO no sistema eletrocatalítico Pt-Ru/C / Studies of the hydrogen oxidation reaction on the presence of CO for the Pt-Ru/C electrocatalytic system
This work shows results of studies regarding the effects of pH and atmosphere of the synthesis on the electrocatalytic properties of Pt/C, Ru/C and PtRu/C materials for the hydrogen oxidation reaction (HOR) in the presence of CO. The performance of these materials were compared for distinct eletrodic configurations of Pt/C + Ru/C physical mixtures, to charac
Publicado em: 2009
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11. Study of oxygen reduction reaction in acidic media on platinum and palladium electrocatalysts supported on carbon / Estudo da reação de redução de oxigênio em meio ácido em eletrocatalisadores de platina e paládio dispersos em carbono
Oxygen reduction reaction (ORR) on platinum-palladium electrocatalysts supported on carbon was studied in H2SO4 electrolyte. The structure of the catalysts was characterized by XRD (X-ray diffractometry) and the composition was determined by EDX (Energy dispersive X-ray spectroscopy). The electronic properties were investigated by in situ XAS (X-ray absorpti
Publicado em: 2009
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12. Aplicação da teoria ac de eletrodos porosos na investigação da cinética de dispositivos eletrocatalíticos / Application of ac theory for porous electrode in the investigation in the kinetics of electrocatalytic devises
This work consists in using Electrochemical Impedance Spectroscopy (EIS) in the research of various electrocatalytic materials. The porous electrode model is a very promising approach to treat the frequency responses of Dimensionally Stable Anodes (DSA®). Once the application of the model is established, it is possible to obtain important kinetic informatio
Publicado em: 2008