Development of Low-Cost Teaching Electrogravimetry Experiments Using the Principles of Green Chemistry

Finazzi, Guilherme Antonio; Martins, Carlos Ney; Capelato, Milton Duffles; Ferreira, Luiz Henrique

doi:10.5935/0100-4042.20150149

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…32 Em um outro estudo realizado, envolveu a elucidação dos mecanismos de troca iônica em supercapacitores utilizando eletrodos de nanofolhas de grafeno, 33 entretanto a técnica apresenta interferências devido ao aumento da resistividade da solução, proveniente dos altos potencias de deposição das espécies eletroativas, do mecanismo de reação e de outros compostos presentes na solução que inviabilizaram a análise. 27,34 As técnicas voltamétricas investigam o processo de redução e oxidação das espécies eletroativas e suas concentrações no sistema. A quantificação é diretamente proporcional a quantidade transferida para o eletrodo e pela variação sistemática da corrente no sistema eletroquímica.…”

Section: Métodos Eletroquímicosunclassified

Electrochemistry: Modified Electrodes and their Potentialities

Monteiro¹,

Júnior²,

Sussuchi³

2020

Rev. Virtual Quim.

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Electrochemical sensors are analytical tools that offer great portability, ease automation, miniaturization capability, and low cost compared to other analytical techniques and methods. For those reasons, there is a growing search for these electrodes to obtain better analysis conditions. This advance is reflected in new patents and articles, which were intensified mainly with the arising of chemically modified electrodes and self-sufficient equipment. Besides, this study brings together and discusses the main aspects of electrochemical methods, the development of electrodes and their modifiers, as well as the perspectives for these electroanalytical tools. Os sensores eletroquímicos são ferramentas de análise que oferecem maior portabilidade, facilidade de automação, capacidade de miniaturização e baixo custo em relação a outras técnicas e métodos analíticos. Por essas razões, existe uma crescente busca pelo desenvolvimento desses eletrodos a fim de se obter melhores condições de análise. Esse avanço reflete em novas patentes e artigos que se intensificaram, principalmente com o surgimento dos eletrodos quimicamente modificados e equipamentos autossuficientes. Em suma, esse estudo reúne e discute aspectos fundamentais concernentes aos métodos eletroquímicos, o avanço no desenvolvimento dos eletrodos e seus modificantes, além das perspectivas para essas ferramentas eletroanalíticas.

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Section: Métodos Eletroquímicosunclassified

Electrochemistry: Modified Electrodes and their Potentialities

Monteiro¹,

Júnior²,

Sussuchi³

2020

Rev. Virtual Quim.

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“…The simplest level of such experiments is the electroplating of a single metal and the observation of its colour, for which the description of tested solution compositions is available [12,13]. The exhaustive electrolysis of a metal salt solution (Ni or Cu) is applicable in an electrogravimetric configuration [14,15] provided that one single metal is to be plated. Electroplating of cobalt appeared in a radiochemical student lab experiment for the demonstration of the isotope dilution-based analysis [16].…”

Section: Introductionmentioning

confidence: 99%

A simple electrodeposition problem and the abundant knowledge it subserves to teach

Péter¹

2023

J Solid State Electrochem

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This paper presents a handful of electrochemical experiments related to one single system that opens up the way to teach a bunch of topics related to physical and inorganic chemistry, hence serving experience-oriented education of otherwise hard-to-understand fields. The key idea is the electrodeposition of metals from the same bath containing Cu2+ and Ni2+ ions onto electrodes that differ from each other either in size or position within the electrochemical cell. With the proper optimization of the current densities, pure Cu and a Ni-rich coating with shiny silver colour can be obtained on electrodes of large and small surface area, respectively. It will be explained in detail how to drive the discussion on the experiment so that the audience learns which processes can be treated as parallel ones (i.e. the deposition of two metals, Cu and Ni), the mass transport taking place in serial with the electrochemical reaction, and the occurrence of the mass transport limitation in an electrode process. Didactic aspects of the experiment are presented for both high school and undergraduate levels, and control experiments are also suggested to verify the conclusions achieved. Collateral topics of chemistry and materials science that can be brought up in connection with the experiment are also enumerated.

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“…Além de facilitar a implementação destes experimentos em Universidades brasileiras, o uso de materiais alternativos torna os experimentos ainda mais atrativos para os discentes, enquanto o respeito à Química Verde contribui para a formação de futuros profissionais com maior consciência ambiental e engajados com o desenvolvimento sustentável. Dentre os conceitos e/ou técnicas abordados nestes trabalhos, pode-se citar: amperometria, 20 corrosão, [21][22][23][24] reatividade de metais, 25 eletrofloculação, 26 eletrólise, 27 voltametria cíclica, [28][29][30] eletrogravimetria, 31 além de métodos de baixo custo para a produção de eletrodos impressos. 32 Os pesquisadores brasileiros têm ainda aproveitado a popularização dos dispositivos eletrônicos para desenvolver potenciostatos de baixo custo.…”

Section: Introductionunclassified

Miniaturizing an Electrochemical Cell on a Cyclic Voltammetry Didactic Experiment: Saving Chemicals and Minimizing Waste Generation

Paiola¹,

Faria²,

Araújo³

et al. 2017

Rev. Virtual Quim.

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The development of a miniaturized electrochemical cell to be applied to didactical experiments involving cyclic voltammetry is presented. The main objective is proposing an experiment for undergraduate courses within the concepts of Green Analytical Chemistry and involves the learning of electrochemistry and analytical chemistry concepts. The electroanalytical techniques are examples of "green" practices analysis once they usually employ small solution volumes, presenting at the same time high sensitivity and are easily miniaturized and automated. Thus, the understanding of electrochemical concepts is of great importance to students offering them, environmentally friendly didactical experiments using alternative and low cost materials, which is extremely welcome. In this context, this work demonstrates that a miniaturized electrochemical cell constructed with micropipette tips can be successfully used to study reversible electron transfer processes by cyclic voltammetry. The proposed electrochemical cell not only has the same performance of a conventional-size electrochemical cell but also brings a remarkable decreasing on chemicals consumption and residue generation.

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Development of Low-Cost Teaching Electrogravimetry Experiments Using the Principles of Green Chemistry

Cited by 5 publications

References 1 publication

Electrochemistry: Modified Electrodes and their Potentialities

Electrochemistry: Modified Electrodes and their Potentialities

A simple electrodeposition problem and the abundant knowledge it subserves to teach

Miniaturizing an Electrochemical Cell on a Cyclic Voltammetry Didactic Experiment: Saving Chemicals and Minimizing Waste Generation

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