Josimar Ribeiro

Universidade Federal do Espírito Santo | UFES · Departamento de Química

PtSn/C-type catalysts modified with Ta and Ru were prepared by the thermal decomposition of polymeric precursors with the following nominal compositions: Pt70Sn10Ta20/C, Pt70Sn10Ta15Ru5/C, Pt70Sn10Ta10Ru10/C and Pt70Sn10Ta5Ru15/C. The physicochemical characterization was performed by X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The el...

The corrosive behavior of the UNS S32205 duplex stainless steel (DSS), as base metal and welded by the welding of inert gas of tungsten (IGT) process with pulsed current, was investigated using different heat inputs. The corrosion evaluation was performed by means of electrochemical tests such as Potentiodynamic Polarization and Electrochemical Imp...

Electrocatalysts of type PtSnNiTi/C were prepared by thermal decomposition of polymeric precursors. The physico-chemical and electrochemical characterization of the electrocatalysts was performed by different techniques: X-ray diffraction, transmission electron microscopy, cyclic voltammetry and chronoamperometry. The XRD results showed that the el...

Binary PtIr, PtSn and ternary PtSnIr electrocatalysts were prepared by the Pechini–Adams modified method on carbon Vulcan XC-72, and these materials were characterized by TEM and XRD. The XRD results showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of solid solutions between the metals Pt/Ir and Pt/Sn....

Preparation methods can profoundly affect the structural and electrochemical properties of electrocatalytic coatings. In this investigation, RuO2–Ta2O5 thin films containing between 10 and 90 at.% Ru were prepared by the Pechini–Adams method. These coatings were electrochemically and physically characterized by cyclic voltammetry, scanning electron...

The Jucu River is one of the main rivers of the state of Espírito Santo/Brazil. The conditions of the waters of the river were studied by physical-chemical parameters, such as temperature, electrical conductivity, dissolved oxygen, turbidity, total solids, dissolved and suspended solids, biochemical oxygen demand, chemical oxygen demand, total nitr...

Electrochemical CO2 reduction (CO2RE) using pure metal oxide electrocatalysts such as SnO2, Co3O4, and CuO supported on Vulcan XC72 carbon could be an alternative to overcome the problems caused by high CO2 emission rates. Electrochemically, CO2 can be converted into high-value-added organic compounds such as hydrocarbons and multicarbons. Thus, am...

Given the environmental problems caused by burning fossil fuels, it is believed that converting carbon dioxide (CO2) into chemical inputs is a great ally to generating clean energy. In this way, investigative studies related to electrochemical CO2 reduction (CO2RE) concerning the behavior of metal catalysts have received attention about the process...

Ribeiro, Josimar R484q Química analítica teórica [recurso eletrônico] : Uma visão qualitativa e quantitativa / Josimar Ribeiro, Rafael de Queiroz Ferreira. - Dados eletrônicos. - Vitória, ES : EDUFES, 2023. 220 p. : il. ; 21 cm. - (Coleção Pesquisa Ufes ; 55) http://repositorio.ufes.br/handle/10/774

Ferreira, Rafael de Queiroz. F368q Química analítica experimental [recurso eletrônico] : Uma visão qualitativa e quantitativa / Rafael de Queiroz Ferreira, Josimar Ribeiro. - Dados eletrônicos. – Vitória, ES : EDUFES, 2023. 196 p. : il. ; 21 cm. - (Coleção Pesquisa Ufes ; 54) Inclui bibliografia. ISBN: 978-85-7772-533-5 Modo de acesso: http://repos...

Lithium‑sulfur (Lisingle bondS) batteries are promising battery systems that provide high capacity and energy density using abundant materials, but they have a significant drawback known as the shuttle effect, which restricts their capacity, increases their internal resistance, and results in poor cyclability. Therefore, several efforts are being f...

A água é essencial para todos os seres vivos do planeta e, devido à poluição dos corpos hídricos relacionada a causas antrópicas e naturais, a qualidade da água é afetada, interferindo nas propriedades naturais do meio ambiente inerentes a manutenção da vida de animais e o consumo pelos seres humanos. [1] O Rio Santa Maria da Vitória e a Baía de Vi...

The production, commercialization and use of dyes by industries has increased signifcantly over the last few decades. The frequent release of liquid efuents into water bodies, which contain high loads of toxic contaminants, such as dyes and pigments, represents a substantial risk to aquatic biota, and negative infuence on wildlife as a whole. Among...

This study aims to compare multivariate calibration methods developed from data obtained by square wave anodic stripping voltammetry using a hanging mercury drop electrode for simultaneous determination of metals in cachaça, the following metals were studied: copper, zinc and cadmium. Multivariate calibration, partial least squares (PLS) and artifi...

Indigo Blue (IB) is a dye widely used by the textile sector for dyeing cellulose cotton fibers and jeans, being considered a recalcitrant substance, and therefore resistant to traditional treatments. Several methodologies are reported in the literature for the removal or degradation of dyes from the aqueous medium, among which photoelectrocatalysis...

This work studies the influence of the addition of tantalum to the ternary PtSnRu/C electrocatalysts on the oxidation of different alcohols: methanol, ethanol, ethylene glycol, and glycerol. The physical-chemical characterizations showed an increase in the lattice parameter of the fcc (face-centered cubic) structure of Pt due to the incorporation o...

An efficient ethanol oxidation reaction (EOR) is required to enhance energy production in alcohol-based fuel cells. The use of bimetallic catalysts promises decreasing reliance on platinum group metal (PGM) electrocatalysts by minimizing the use of these expensive materials in the overall electrocatalyst composition. In this article, an alternative...

An efficient ethanol oxidation reaction (EOR) is required to enhance energy production in alcohol-based fuel cells. The use of bimetallic catalysts promises decreasing reliance on platinum group metal (PGM) electrocatalysts by minimizing the use of these expensive materials in the overall electrocatalyst composition. In this article, an alternative...

An efficient ethanol oxidation reaction (EOR) is required to enhance energy production in alcohol-based fuel cells. The use of bimetallic catalysts promises decreasing reliance on platinum group metal (PGM) electrocatalysts by minimizing the use of these expensive materials in the overall electrocatalyst composition. In this article, an alternative...

Urea is an added value chemical with wide applications in the industry and agriculture. The release of urea waste to the environment affects ecosystem health despite its low toxicity. Online monitoring of urea for industrial applications and environmental health is an unaddressed challenge. Electroanalytical techniques can be a smart integrated sol...

Physical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd 1.3 Ru 1.0 , Pd 3.2 Ru 1.3 Mo 1.0 and Pd 1.5 Ru 0.8 Mo 1.0 were synthesized on Carbon Vulcan XC72 support by the method of thermal decomposition of polymeric precursors and then physically and electrochemically ch...

Ce/carbonaceous matrices-based composites with potential application in electrochemical processes were successfully produced. Ce-based MOF-76 (Metal Organic-Framework-76 family, formed by lanthanide ions coordinated to 1,3,5-benzenetricarboxylic acid ligand-H 3 BTC or simply BTC) was prepared with different percentages of graphene oxide (GO) in sit...

Three molecules containing morpholine, 1,4-naphthoquinone, 7-chloroquinoline and 1,3,5-triazine cores, scaffolds with recognized anti-corrosive activity, were synthesized and had their anticorrosive activity evaluated through potenti-odynamic polarization and electrochemical impedance studies. Both studies were conducted in a simulated production w...

The novelty of this paper is the analysis in a medium containing sulfide ion due to the generation of this ion in petroleum industries, in the refining stage (the sulfide ion is also present on the produced water). The performance of 1-hydroxyethylidene-1,1-diphosphonic acid inhibitor (HEDP) was investigated by potentiodynamic polarization, electro...

Since 2000 the number of publications related to Electrochemical Impedance Spectroscopy - EIS has been gradually increasing, going from just over 81 publications in 2000 to over 1800 publications in 2019. In 2020, more than 1028 publications are seen in just 4 months, that is, more than 18,000 publications in the last 20 years. EIS is a very powerf...

Green synthesis of metallic nanoparticles has become incredibly popular, mainly by minimizing problems of environmental contamination and by being able to reduce, stabilize and potentially functionalize nanomaterials. Such compounds have possible applications in various areas, e.g., pharmaceuticals (drug delivery systems, cosmetics), textile indust...

The efficiency of the electrocoagulation method to remove boron from synthetic and mining effluents was investigated in this study. Different parameters were tested using boric acid solution and effluent collected from a mining company located in the city of Vitória-ES. The results showed a percentage of boron removal of over 60% for the synthetic...

Ni and Ga elements are inexpensive compared to the Pt. Ni and NiOx have been recognized to have potential applications in ethanol electrooxidation. For these reasons and based on previous results obtained with Ga addition on Pt-based electrocatalysts we have investigated the PtSn/C electrocatalysts modified with Ni and Ga. The PtSnNiGa/C electrocat...

The objective of this paper was to determine the physico-chemical and biological parameters of the water of the Santa Maria da Vitória-ES River and the Vitória bay-ES from May to November 2016 and March to June 2017, and six collection points were monitored. The values of concentration of Cd and Pb metals are below the limits of quantification the...

The corrosive behavior of the UNS S32205 duplex stainless steel (DSS), as base metal and welded by the welding of inert gas of tungsten (IGT) process with pulsed current, was investigated using different heat inputs. The corrosion evaluation was performed by means of electrochemical tests such as Potentiodynamic Polarization and Electrochemical Imp...

Ethanol is a promising alternative source for fuel cells due to its low toxicity and high power density. However, the cleavage of the C-C bond, CO poisoning, and low electrocatalyst stability are still considered crucial issues. To overcome this limitation, binary, ternary and quaternary electrocatalysts have been investigated along with new carbon...

This paper is consisted in the synthesis of platinum-based electrocatalysts supported on carbon (Vulcan XC-72) and investigation of the addition of gallium in their physicochemical and electrochemical properties toward ethanol oxidation reaction (EOR). PtGa/C electrocatalysts were prepared through thermal decomposition of polymeric precursor method...

This paper aimed to prepare electrodes DSA ®-type (dimensionally stable anode) consisting of transition metal oxides such as ruthenium, titanium and tantalum with the following nominal compositions: TiO 2 (100 %); RuO 2-TiO 2-Ru:Ti = 30:70 % atomic; RuO 2-TiO 2-Ta 2 O 5-Ru:Ti:Ta = 30:40:30 % atomic; Ta 2 O 5 (100 %); RuO 2-Ta 2 O 5-Ru:Ta = 30:70 %...

RESUMO Esse trabalho trata da possibilidade de reutilizar a água do rejeito e a sobra da água permeada proveniente de um sistema de Osmose Reversa, OR, da unidade de hemodiálise do Hospital das Clínicas de Ribeirão Preto (HCRP-USP). O estudo foi feito por meio de levantamento estrutural com plantas físicas e 'layout' do local, fazendo visitas a ess...

This paper describes the effect of the composition of the oxide films on the properties of electrodes Ti/M x Ti y Sn z O 2 (M = Ir or Ru) prepared by the polymeric precursor method. XRD studies showed that the anodes are formed by solid solutions. The electrodes containing IrO 2 exhibit lower activity for the oxygen evolution reaction. The doping o...

Esse trabalho trata da possibilidade de reutilizar a água do rejeito e a sobra da água permeada proveniente de um sistemade Osmose Reversa, OR, da unidade de hemodiálise do Hospital das Clínicas de Ribeirão Preto (HCRP-USP). O estudo foi feito por meio de levantamento estrutural com plantas físicas e ‘layout’do local, fazendo visitas a esse local p...

The behavior of corrosion and corrosion inhibition of UNS S31803 duplex stainless steel (DSS) were studied in sodium chloride solution (3.0 wt. %), in the absence and presence of benzimidazole and imidazole corrosion inhibitors. The chemical and morphological characterization of steels were performed using the techniques such as optical emission sp...

Physicochemical and electrochemical characterisations of Pt-based electrocatalysts supported on carbon (Vulcan carbon, C1, and carbon produced by plasma pyrolysis of natural gas, C2) toward ethanol electrooxidation were investigated. The Pt 20 /C1 80 and Pt 20 /C2 80 electrocatalysts were prepared by thermal decomposition of polymeric precursors at...

The behavior of corrosion and corrosion inhibition of AISI 1010 carbon steel, AISI 316 stainless steel and UNS S31803 duplex steel was studied in sodium chloride solution (3.0 wt. %), in the absence and presence of benzimidazole and imidazole corrosion inhibitors. The chemical and morphological characterization of steels were performed using the te...

Physicochemical and electrochemical characterisations of Pt-based electrocatalysts supported on carbon (Vulcan® XC72, C1 and carbon produced using a plasma torch from natural gas vehicles, C2) toward ethanol electrooxidation were investigated. The Pt/C1 and Pt/C2 electrocatalysts were prepared by thermal decomposition of polymeric precursors at 350...

The corrosion behavior of AISI 304 and AISI 430 stainless steels was investigated in 3.0 wt. % NaCl solutions in the presence and absence of benzimidazole inhibitor. The inhibition efficiency was evaluated at six different inhibitor concentrations, and for all concentrations, an increase in corrosion potential were observed. The AFM measurements sh...

O presente trabalho trata da preparação e caracterização de eletrodos do tipo Anodos Dimensionalmente Estáveis, ADE®, para degradação de compostos orgânicos. Os eletrodos foram preparados pela decomposição térmica de precursores poliméricos a 450 ºC, com as seguintes composições nominais: Ti/Pt(30%)RuO2(10%)SnO2(60%), Ti/Pt(30%)RuO2(30%)SnO2(40%) e...

An electrochemical investigation of the corrosion on AISI 316 austenitic stainless steel and AISI 1010 carbon steel in sodium chloride solution (3.0 wt.%) was performed in the absence and presence of imidazole and benzimidazole corrosion inhibitors. The results showed that at any in-hibitor concentration (25 ppm to 1000 ppm), there was an increase...

This paper investigated the corrosion behavior of AISI 304 and AISI 430 stainless steels in 3.0 wt. % NaCl solutions in both the presence and absence of pyridine or benzimidazole as inhibitor. The electrochemical study was performed using the polarization technique. Electrode surface morphology was characterized by Atomic Force Microscopy (AFM) and...

The corrosion behavior of stainless steel AISI 304 and AISI 430 was investigated in NaCl 3.0% in the presence and absence of the pyridine and benzimidazole inhibitors. The electrochemical study was performed using the technique of polarization, the surface morphology of the electrodes was characterized by using the techniques of X-rays Diffraction,...

The inappropriate treatment and disposal of municipal solid waste (MSW) have, in recent decades, exacerbated the worsening environmental problems, causing severe damage to the environment and thus reducing the quality of life. Hence the importance of educating the public and raising awareness of the need to be environmentally friendly. Thus, this p...

A systematic investigation of alcohol adsorption and oxidation on binary and ternary electrocatalysts in acid medium was performed. Binary (PtRh) and ternary (PtRhSn) were prepared by the Pechini modified method on carbon Vulcan XC-72, and different nominal compositions were characterized by energy dispersive X-ray and X-ray diffraction (XRD) techn...

This work consisted in the preparation of platinum-based catalysts supported on carbon (Vulcan XC-72) and investigation of their physicochemical and electrochemical properties. Catalysts of the C/Pt-Ni-Sn-Me (Me = Ru or Ir) type were prepared by the Pechini method at temperature of 350°C. Four different compositions were homemade: C/Pt(60)Sn(10)Ni(...

Binary, ternary and quaternary electrocatalysts of type C/Pt-based were prepared by the Pechini method. The physical-chemical characterization and electrochemical investigation of the electrocatalysts were performed by different techniques: X-ray diffraction, cyclic voltammetry and chronoamperometry. The XRD results show that the electrocatalysts a...

This work consisted in the preparation of platinum-based catalysts supported on carbon (Vulcan XC-72) and investigation of their physicochemical and electrochemical properties. Catalysts of the C/Pt-Ni-Sn-Me (Me = Ru or Ir) type were prepared by the Pechini method at temperature of 3 5 0 ∘ C . Four different compositions were homemade: C/Pt60Sn10N...

Remediation of water polluted by toxic organic compounds has been the subject of many investigations. Many researchers are currently seeking alternatives for the degradation of these toxic organic compounds. On the basis of the data obtained by our research group, we will focus on recent results regarding the preparation of ruthenium-based electrod...

This work aimed to develop a method for the preparation of carbon-supported platinum nanocatalysts modified with Ruthenium and Tin, which were then evaluated for ethanol eletrooxidation in direct fuel cells. The Pechini method was employed to obtain these catalysts. This method consists in the decomposition of a polymeric precursor of metal salts....

The influence of the preparation method on the structural properties of the RuO2–Ta2O5 system was investigated. Both thin films on Ti substrates and powder samples of nominal composition Ti/RuO2–Ta2O5 (Ru:Ta = 100:0, 90:10, 80:20, 30:70, and 0:100 at.%) were prepared through thermal decomposition of polymeric precursors (DPP). The thin films and po...

Pt-Ru catalysts supported on Vulcan XC-72 carbon powder were synthesized by the polymeric precursor decomposition method. The catalysts were prepared at different temperatures in order to investigate the influence of the calcination temperature on catalyst performance. Structural and morphological characterization was accomplished by X-ray diffract...

This paper describes the electrochemical characterization of DSA®-type electrodes using niobium substrate, and the results were compared with traditional DSA®-type oxide electrodes, i.e., using titanium substrate. The surface morphology, electrocatalytic activity, and stability of the coating were investigated by scanning electron microscopy, energ...

The influence of the preparation method on the performance of RuO2–Ta2O5 electrodes was evaluated toward the ethanol oxidation reaction (EOR). Freshly prepared RuO2–Ta2O5 thin films containing between 30 and 80 at.% Ru were prepared by two different methods: the modified Pechini–Adams method (DPP) and standard thermal decomposition (STD). Electroch...

Binary and ternary Pt-based catalysts were prepared by the Pechini–Adams modified method on carbon Vulcan XC-72, and different nominal compositions were characterized by TEM and XRD. XRD showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of a solid solution between the metals Pt/W and Pt/Sn. Electrochemic...

The aim of this work was to prepare electrodes based on the Ti/Ir x Sn(1−x)O2 composition, as well as test their stability toward the chlorine evolution reaction (ClER). To this end, two different preparation routes were investigated: thermal decomposition of polymeric precursors (DPP) and standard decomposition using isopropanol as solvent (SD/ISO...

Anodes containing ruthenium, titanium, and tin oxides supported on metallic Ti were prepared by thermal decomposition of precursor salts in order to investigate the effect that changing the solvent (from HCl/H2O to isopropanol) would have on the real composition of the mixed oxide electrodes. The precursor solutions and their mixtures were analyzed...

Freshly prepared RuO2–Ta2O5 thin films containing between 10 and 80 atom% Ru have been examined and characterized by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and morphological analysis (SEM – scanning electron microscopy/EDS – energy dispersive X-ray spectroscopy). Investigation of the electrical properties, charging p...

A systematic investigation of the structural, morphological, and electrochemical properties of anodes with a nominal composition of Ti/RuO2-Ta2O5 (Ru:Ta = 10: 90; 30:70; 50:50 and 80:20 atom %) was performed. The oxide layer surface morphology, microstructure, and composition were investigated prior to and after accelerated life test through energy...