Electrochemical Driving Force
Electrochemical Driving Force - Related Videos
09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Cited by 31 •
2015
We demonstrate the extraction of ammonium from an ammonium-rich stream using an electrochemical and a bioelectrochemical system. The reactor setup, operation and data analysis are discussed.
07:39
Electrochemical Biosensing
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2023
Electrochemical biosensors detect the binding of a target molecule by sensing an oxidation-reduction event. These sensors paved the way for modern biosensing after the invention of the glucose biosensor. This video will introduce electrochemical biosensing, show the workings of the glucose biosensor, and discuss how electrochemical biosensors are used in cancer detection.
14:03
Micro-drive Array for Chronic in vivo Recording: Drive Fabrication
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Cited by 110 •
2009
In this protocol we demonstrate how to fabricate a micro-drive array for chronic electrophysiological recordings in rats.
10:38
Electrochemical Measurements of Supported Catalysts Using a Potentiostat/Galvanostat
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2023
Source: Laboratory of Dr. Yuriy Román — Massachusetts Institute of Technology A potentiostat/galvanostat (often referred to as simply a potentiostat) is an instrument that measures current at an applied potential (potentiostatic operation) or measures potential at an applied current (galvanostatic operation) (Figure 1). It is the most commonly used instrument in the electrochemical characterization of anode and cathode materials for fuel cells, electrolyzers, batteries, and supercapacitors.
08:59
Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
FAQs
Chemical potential differences favor changes in species composition, while electrical potential differences influence the movement of charged particles and electrons. Their combined effect determines whether an electrochemical reaction is thermodynamically favorable. Considering both contributions is essential because a reaction may be driven by chemical differences, electrical differences, or a combination of the two.
The equation ΔG = −nFE connects measurable cell potential with Gibbs free energy. Here, n represents the amount of electrons transferred and F is the Faraday constant. A positive cell potential corresponds to negative ΔG and therefore favorable reaction conditions, whereas a negative potential indicates that the reaction is not favorable in that direction.
In a galvanic cell, oxidation at the anode releases electrons, which travel through the external circuit toward the cathode. The cathode is the site where the corresponding reduction occurs. This separation allows electron movement to generate an electrical current, while the chemical changes at both electrodes remain linked through the complete cell reaction.
Electron transfer through the external circuit alone would produce charge imbalance within the cell. Ion movement helps maintain charge balance as oxidation and reduction proceed at separate electrodes. This internal ionic adjustment supports continued operation of the cell and allows the measured electrical response to reflect the overall electrochemical reaction rather than rapid charge accumulation.
A chemist can evaluate the cell potential for the proposed oxidation and reduction processes, then relate that value to Gibbs free energy using ΔG = −nFE. The sign of ΔG indicates whether the reaction is thermodynamically favorable in the selected direction. This approach helps compare possible redox arrangements and identify conditions associated with equilibrium.
The same thermodynamic framework helps explain energy-producing and energy-consuming electrochemical systems. Batteries and fuel cells rely on favorable redox processes to produce electrical output, whereas electrolysis requires control of an imposed electrical process. Corrosion analysis uses the driving force to examine unwanted redox reactions and to understand why metallic materials deteriorate under particular conditions.