Composite planar electrode for sensing electrochemical oxygen demand

Orozco, Jahir; Fernández‐Sánchez, César; Mendoza, Ernest; Baeza, Mireia; Céspedes, Francisco; Jiménez-Jorquera, Cecilia

doi:10.1016/j.aca.2007.11.037

Cited by 36 publications

(27 citation statements)

References 31 publications

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“…Two different amperometic microsensors were employed: a conventional Au microelectrode fabricated according to standard photolithographic techniques and a composite planar electrode (CPE) for sensing electrochemical oxygen demand developed by our group [25]. In both cases, the amperometric cell contained the working electrode, a Pt commercial electrode as counter electrode (Radiometer, Lyon, France) and a Ag/AgCl/10% (w/v) KNO3 reference electrode (Metrohm 0726 100, Herisau, Switzerland).…”

Section: Methodsmentioning

confidence: 99%

Application of an E-Tongue to the Analysis of Monovarietal and Blends of White Wines

Gutiérrez

Llobera

Ipatov

et al. 2011

Sensors

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This work presents a multiparametric system capable of characterizing and classifying white wines according to the grape variety and geographical origin. Besides, it quantifies specific parameters of interest for quality control in wine. The system, known as a hybrid electronic tongue, consists of an array of electrochemical microsensors—six ISFET based sensors, a conductivity sensor, a redox potential sensor and two amperometric electrodes, a gold microelectrode and a microelectrode for sensing electrochemical oxygen demand—and a miniaturized optofluidic system. The test sample set comprised eighteen Catalan monovarietal white wines from four different grape varieties, two Croatian monovarietal white wines and seven bi- and trivarietal mixtures prepared from the Catalan varieties. Different chemometric tools were used to characterize (i.e., Principal Component Analysis), classify (i.e., Soft Independent Modeling Class Analogy) and quantify (i.e., Partial-Least Squares) some parameters of interest. The results demonstrate the usefulness of the multisensor system for analysis of wine.

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Section: Methodsmentioning

confidence: 99%

Application of an E-Tongue to the Analysis of Monovarietal and Blends of White Wines

Gutiérrez

Llobera

Ipatov

et al. 2011

Sensors

Self Cite

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“…The standard COD determination method is dichromate titration [3], which involves toxic (Cr 6+ , Hg 2+ ) and expensive (Ag 2 SO 4 ) chemicals [1][2][3] and is difficult to realize in situ monitoring. Among the alternative methods, such as electrochemical oxidation method [1,[3][4][5], photocatalytic oxidation method [6][7][8][9] and photoelectrocatalytic oxidation method [10][11][12], electrochemical oxidation method has been proposed as the most potential manner for COD in situ detection.…”

Section: Introductionmentioning

confidence: 99%

“…For electrochemical detection of COD, the adsorbed hydroxyl radicals (·OH) which are electro-generated on the anode at an appropriate potential react with the organic compounds in electrolyte [13,14], and the current response to electrochemical regeneration of ·OH radicals is proportional to the concentration of the organic compounds in electrolyte [1,[3][4][5][13][14][15][16][17][18]. Several kinds of electrochemical sensors for the determination of COD, such as AgO/CuO [15], PbO 2 [13,16], Rh 2 O 3 /Ti [17], Cu/CuO [18] and boron-doped diamond (BDD) [3] electrodes, have been developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Development of a Three-Dimensional Structured Carbon Fiber Felt/β-PbO2 Electrode and Its Application in Chemical Oxygen Demand Determination

Tang

Wang

et al. 2015

Electrochimica Acta

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“…Recently, it has been developed different composite materials based on different types of polymeric matrices, obtaining interesting electrochemical applications by using graphite powder as conductive phase [1,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of raw carbon nanotubes diameter for the optimization of the load composition ratio in epoxy amperometric composite sensors

et al. 2014

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In this work, it is reported the necessity to characterize the raw carbon materials before their application in composite electrodes based on multiwall carbon nanotubes (MWCNTs) dispersed in epoxy resin for the development of improved amperometric sensors. These sensors must contain an optimum MWCNT/epoxy ratio for their best electroanalytical response. The main drawback in MWCNTs composite materials resides in the lack of homogeneity of the different commercial nanotubes largely due to different impurities content, as well as dispersion in their diameter/length ratio and state of aggregation. The optimal composite electrode composition takes into account the high electrode sensitivity, low limit of detection, fast response, and electroanalytical reproducibility. These features depend on carbon nanotube physical properties as the diameter. Three different commercial carbon nanotubes with different diameters were characterized by transmission electron microscopy and the results were significantly different from the ones provided by the manufacturers. Then, the three MWCNTs were used for the MWCNT/epoxy sensors construction. After an accurate electrochemical characterization by cyclic voltammetry and electrochemical impedance spectroscopy, they were employed as working electrodes using ascorbic acid as a reference analyte. Percolation theory was applied in order to verify the electrochemical results. It is demonstrated that the optimum interval load of raw carbon material in the optimized-composite electrodes closely depends on the MWCNTs diameter, needing 5 % in carbon content for the narrowest MWCNTs containing composite electrodes versus 12 % for the widest MWCNTs.

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Composite planar electrode for sensing electrochemical oxygen demand

Cited by 36 publications

References 31 publications

Application of an E-Tongue to the Analysis of Monovarietal and Blends of White Wines

Application of an E-Tongue to the Analysis of Monovarietal and Blends of White Wines

Development of a Three-Dimensional Structured Carbon Fiber Felt/β-PbO2 Electrode and Its Application in Chemical Oxygen Demand Determination

Influence of raw carbon nanotubes diameter for the optimization of the load composition ratio in epoxy amperometric composite sensors

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