3.17 Galvanic Cell | ScienceGate

Boron oxide in the Na2O.P2O5-x B2O3 system behaves as a Lux base. Its addition to Na2O.P2O5 brings about transformation of a Co(II) indicator from octahedral to tetrahedral configuration, increase in the optical basicity ΛPb(II), increase in the relative basicity of the melt as determined by means of a galvanic cell, and depolymerization reactions releasing PO43- ions. In the Na2O-B2O3 system free of P2O5, boron oxide behaves as a Lux acid. The amphoretic nature of B2O3 is explained in terms of Lux's acid-base theory extended in analogy with the protolysis theory. The theoretical optical basicity values do not indicate the amphoretic behaviour of B2O3 because in this approach boron oxide is a priori regarded as more acidic than Na2O.P2O5.

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Electrodegradation of Acid Mixture Dye through the Employment of Cu/Fe Macro-Corrosion Galvanic Cell in Na2SO4 Synthetic Wastewater

Molecules ◽

10.3390/molecules26154580 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4580

Author(s):

Mateusz Kuczyński ◽

Mateusz Łuba ◽

Tomasz Mikołajczyk ◽

Bogusław Pierożyński ◽

Agnieszka Jasiecka-Mikołajczyk ◽

...

Keyword(s):

Electrochemical Techniques ◽

Electrical Energy ◽

Galvanic Cell ◽

Synthetic Wastewater ◽

Acid Mixture ◽

Ac Impedance Spectroscopy ◽

Wastewater Purification ◽

Physical Chemical ◽

Iron Anode ◽

Biological Methods

Traditional wastewater purification processes are based on a combination of physical, chemical, and biological methods; however, typical electrochemical techniques for removing pollutants require large amounts of electrical energy. In this study, we report on a process of wastewater purification, through continuous anodic dissolution of iron anode for aerated Cu/Fe galvanic cell in synthetic Na2SO4 wastewater solution. Electrochemical experiments were conducted by means of a laboratory size electrolyzer, where electrocoagulation along with electrooxidation phenomena were examined for wastewater containing Acid Mixture dye. The above was visualized through the employment of electrochemical (cyclic voltammetry and ac impedance spectroscopy techniques) along with instrumental spectroscopy analyses.

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Self-Powered Point-of-Care Device for Galvanic Cell-Based Sample Concentration Measurement

Sensors ◽

10.3390/s21082665 ◽

2021 ◽

Vol 21 (8) ◽

pp. 2665

Author(s):

Albert Álvarez-Carulla ◽

Yaiza Montes-Cebrián ◽

Jordi Colomer-Farrarons ◽

Pere Lluís Miribel-Català

Keyword(s):

Low Power ◽

Point Of Care ◽

Linear Sweep Voltammetry ◽

Electronic System ◽

Concentration Measurement ◽

Galvanic Cell ◽

Sample Concentration ◽

Maximum Coefficient ◽

Self Powered ◽

Transfer Function Gain

A novel self-powered point-of-care low-power electronics approach for galvanic cell-based sample concentration measurement is presented. The electronic system harvests and senses at the same time from the single cell. The system implements a solution that is suitable in those scenarios where extreme low power is generated from the fuel cell. The proposed approach implements a capacitive-based method to perform a non-linear sweep voltammetry to the cell, but without the need to implement a potentiostat amplifier for that purpose. It provides a digital-user readable result without the need for external non-self-powered devices or instruments compared with other solutions. The system conception was validated for a particular case. The scenario consisted of the measurement of a NaCl solution as the electrolyte, which was related to the conductivity of the sample. The electronic reader continuously measured the current with a transfer function gain of 1.012 V mA−1. The overall system exhibited a maximum coefficient of variation of 6.1%, which was an improvement compared with the state-of-the-art. The proof of concept of this electronics system was validated with a maximum power consumption of 5.8 μW using commercial-off-the-self parts.

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