Revised theory of entropy and reversible energy flow in galvanic cells

Mertin, Gerrit Karl; Oldenburger, Marc; Richter, Ernst; Hofmann, Markus H.; Birke, Kai Peter

doi:10.1016/j.jpowsour.2020.228813

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Measurement of the cell voltage provides access to the Gibbs energy of the cell reaction, measurement of the cell voltage as a function of cell temperature provides a way to the reaction entropy. For a revised theory of entropy changes in running galvanic cells see [6]. Both values properly combined yield the reaction enthalpy.…”

Section: The Galvanic Cellmentioning

confidence: 99%

“…The many experiments possible in a Physical Chemistry lab course [4] are frequently associated with a dubious or even infamous image; frequent failures and imprecise results are only some of the popular complaints. Thus, descriptions of fail-safe procedures and experiments are welcome [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Calorimetric experiments suitable for the determination of enthalpies, more precisely changes of enthalpy ΔH, during phase transitions and many chemical reactions are well-established, practically helpful descriptions are available [4][5][6]. Corresponding procedures for determinations of Gibbs energies and entropies of reactions are hard to find, they are seldom found in popular textbooks.…”

Section: Introductionmentioning

confidence: 99%

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How to Estimate Thermodynamic Data and Verify Relationships Using Simple Electrochemistry

Holze

2023

Univers. J. Electrochem.

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Experimental determination of thermodynamic quantities can be very simple, but some suggested procedures can be complicated and cumbersome. They can be almost impossible in the student’s laboratory in chemistry education. Electrochemistry provides easy and simple access to those data for chemical reactions which can be executed in an electrochemical cell. Two examples are presented and discussed, their results are critically examined.

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Section: The Galvanic Cellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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How to Estimate Thermodynamic Data and Verify Relationships Using Simple Electrochemistry

Holze

2023

Univers. J. Electrochem.

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“…There are two methods used fruit acid properties become the alternative energy such as bio-batteries (Khairiah, 2017;Pulungan et al, 2017;Sumanzaya et al, 2019) volta cells or galvanic cells (Mertin et al, 2021;Suciyati et al, 2019;Suryaningsih, 2016;Vassel et al, 2021;Vassel & Vassel, 2017, 2020. Bio-Battery is a battery with paste derived from natural that are environmentally friendly and do not contain harmful chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…Spontaneous redox reactions can result in the electrical energy. A galvanic cell consists of two different metals used as anode and cathode and an acidic electrolyte solution as a source of ions that produce an electric current (Lacina et al, 2018;Mertin et al, 2021;Shevtsof et al, 2021;Sulaiman et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Characteristic of Ceremai Fruit Electrical Properties as Electrolyte Solution in Galvanic Cells

Meiliyadi¹,

Damayanti²,

Syuzita³

2023

jppipa, pendidikan ipa, fisika, biologi, kimia

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It has been conducted a research to analyze ceremai fruit (Phyllanthus acidus) as an electrolyte solution for galvanic cells. The materials used consisted of copper (Cu), zinc (Zn) electrodes and an electrolyte solution from ceremai fruit. Electrolyte solution with a concentration variation of 60 to 100% was obtained from pure ceremai fruit electrolyte solution mixed with aquades. In addition, the electrolyte solution is fermented in a period of 1 to 5 days. The variables measured were pH, voltage, electric current and electric power. Based on the data analysis, it was found that the value of the acidity level was proportional to the concentration where at 100% solution concentration the pH value was 4.8 and at 60% the pH value was 5.4. The greatest voltage is 1 volt that obtained when the solution is in the most acidic state or highest concentration. It is found that the greater the concentration of the solution, the smaller the pH value (the acidity level increases) the value of the voltage, current and power will increase. However, when the electrolyte solution is fermented, it appears that the pH value is inversely proportional to the voltage generated. The longer of fermentation time, the pH value will increase but the voltage value will decrease. When the electrolyte solution is fresh, the pH value is 4.8 with a voltage of 1 volt, but on the 5th day of fermentation the acidity level increases with pH value of 2.15 but the voltage decreases to 0.65 volts. This is caused by oxygen exposure at the time of measurement so that the oxygen in the solution will increase. An increase of oxygen will reduce the density of electrically charged ions so that the current will decreases and the voltage will also decrease.

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Research on thermo-electrochemical behaviors and energy conversion in discharge process of vanadium-manganese flow battery associated with MnO2 precipitation

Wang

Chen

2022

Applied Thermal Engineering

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Revised theory of entropy and reversible energy flow in galvanic cells

Cited by 10 publications

References 22 publications

How to Estimate Thermodynamic Data and Verify Relationships Using Simple Electrochemistry

How to Estimate Thermodynamic Data and Verify Relationships Using Simple Electrochemistry

Characteristic of Ceremai Fruit Electrical Properties as Electrolyte Solution in Galvanic Cells

Research on thermo-electrochemical behaviors and energy conversion in discharge process of vanadium-manganese flow battery associated with MnO2 precipitation

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