Why the Daniell cell works!

Martins, George

doi:10.1021/ed067p482

Cited by 9 publications

(8 citation statements)

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“…The ability to energize liquids or solids (foods) proves that directing the flow of electric current provides the acidification and alkalinization of the means (Ahmed, 2016;Anpilov et al, 2001;Chen et al, 2016;Griffiths et al, 2016;Duvoisin et al, 2017a, b;Duvoisin & Baggio, 2016;Foster et al, 2012;Garotti, 2018;Hazmi et al, 2013;Julák et al, 2012;Kebriaei et al, 2015;Martins, 1990;Matsumoto et al, 2015). Accordingly, through the scientific evidence exposed in this study, is possible to prove the hypothesis proposed thereby supporting the innovation system of electro-neutralization of agrochemicals.…”

Section: Discussionmentioning

confidence: 99%

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System electro-neutralizer of agrochemicals contained in food and water samples through electrons trap

et al. 2020

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This study presents a system to electro-neutralize agrochemicals in food and water samples based on the properties of a controlled electron trap, the related apparatus is protected under patent application (WD/2018/090110; ONPO: BR 10 2016 0268486) / (PCT / BR 2017/050115). The efficacy of the system was verified as to the type, quantity, surface tension charge, temperature, pH and static energy loading of the electrolyte for both solid and liquid samples. Ot also took into consideration the retention and accumulation measurement of electric charges, verification of electrical potential differences and also accumulation by applying pulsed high voltage in according to the Daniell Cell method. The proposed technology is able to provide the electron-neutralization of acidic and alkaline chemicals and their toxic byproducts by modifying the pH of the liquid or solid medium. This is justified by the action of the electron trap using different polarities and electrodes in the range of 8 to 100 kV.

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Section: Discussionmentioning

confidence: 99%

“…The assay methodology used was based on the principles of the Daniell Cell (Martins, 1990) with variation between the materials of the electrodes inserted in the limes.…”

Section: Verification Of Potential Difference Change and Retention Anmentioning

confidence: 99%

System electro-neutralizer of agrochemicals contained in food and water samples through electrons trap

et al. 2020

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“…The standard potential (E°) values are tabulated (WOLYNEC, 2003;MOORE, 1976) for the electrodes as follows: copper (couple (Cu 2+ /Cu)) reduction = 0.34 V and zinc (couple (Zn 2+ /Zn)) = 0.76 V, both relative to hydrogen potential at 25 °C and 1 atm pressure. A historical analysis of the Daniell cell teaching was reported by Boulabiar et al (2004), and a detailed discussion on the reason why it works was conducted by George F. Martins (1990). Buckbee et al(1969) investigated the dependence of standard cell potential, E o , of the Daniel cell on the temperature; they observed E o decreased when the temperature increased, and designed a quadratic equation that showed E varied in function of temperature.…”

Section: Anodic Semi-reactionmentioning

confidence: 99%

“…Anode and cathode are composed of two metallic plates, respectively, i.e., zinc in a zinc sulfate solution (1.0 mol L -1 ) and copper in a copper sulfate solution (1.0 mol L -1 ). Such two compartments are interconnected by an ionic conductor, called salt bridge (FATIBELLO-FILHO, 2019;MARTINS, 1990;MCSWINEY, 1982). A schematic representation of the Daniell galvanic cell is provided in Figure 1 and follows are the halves and overall reactions that occur in the cell.…”

Section: Introductionmentioning

confidence: 99%

Nernst equation applied to electrochemical systems and centenary of his Nobel Prize in chemistry

Ciribelli

Colmati

Souza

2020

Int J Innov Educ Res

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Walther Hermann Nernst received the Nobel Prize in Chemistry in 1920 for the formulation of the third law of thermodynamics, thus celebrating a century in this 2020 year. His work helped the establishment of modern physical chemistry, since he researched into fields, such as thermodynamics and electrochemistry, in which the Nernst equation is included. This paper reports on several experiments that used a Daniell galvanic cell working in different electrolyte concentrations for comparing results with the theoretical values calculated by the Nernst equation. The concentration and activity coefficients values employed for zinc sulfate and copper electrolytes showed activity can replaces concentrations in thermodynamic functions, and the results are entirely consistent with experimental data. The experimental electromotive force from standard Daniell cell, for ZnSO4 and CuSO4, with unitary activity and in different concentrations at room temperature is in agreement with those from theoretical calculations. Cu2+ ion concentrations and temperature were simultaneously varied; however, the cell potential cannot be included in calculations of Nernst equation for different temperatures than 25 °C because the standard potential value was set at 25 °C. The cell potential decreases drastically when the Cu2+ concentration was reduced and the temperature was above 80 oC.

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“…Daniell cell, invented by the British chemist John Frederic Daniell in 1836, is popularly known as a kind of zinc-copper battery which takes advantage of a porous barrier between the two metals 1 2 . Once used widely in the European telegraph industry, it was supplanted in the late 19th century by more modern battery designs.…”

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confidence: 99%

Re-building Daniell Cell with a Li-ion exchange Film

Dong

Wang

Xia

2014

Sci Rep

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Daniell cell (i.e. Zn-Cu battery) is widely used in chemistry curricula to illustrate how batteries work, although it has been supplanted in the late 19th century by more modern battery designs because of Cu2+-crossover-induced self-discharge and un-rechargeable characteristic. Herein, it is re-built by using a ceramic Li-ion exchange film to separate Cu and Zn electrodes for preventing Cu2+-crossover between two electrodes. The re-built Zn-Cu battery can be cycled for 150 times without capacity attenuation and self-discharge, and displays a theoretical energy density of 68.3 Wh kg−1. It is more important that both electrodes of the battery are renewable, reusable, low toxicity and environmentally friendly. Owing to these advantages mentioned above, the re-built Daniell cell can be considered as a promising and green stationary power source for large-scale energy storage.

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Why the Daniell cell works!

Abstract: The strength of bonds between atoms in metals, the relative ease of removing electrons from atoms, and the energy lowering of the attraction of water molecules for positive ions in solution all aid beginning student's understanding of why reactions occur.

Cited by 9 publications

References 0 publications

System electro-neutralizer of agrochemicals contained in food and water samples through electrons trap

System electro-neutralizer of agrochemicals contained in food and water samples through electrons trap

Nernst equation applied to electrochemical systems and centenary of his Nobel Prize in chemistry

Re-building Daniell Cell with a Li-ion exchange Film

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