Molly Ayala
Electrochemistry is a branch of physical chemistry that deals with the relationship between electricity and chemical changes. It involves the study of chemical processes that cause electrons to move, resulting in the production of electricity. Electrochemical reactions are distinct from conventional chemical reactions in that they involve the transfer of electrons between two substances, typically a solid and a liquid, and are driven by an electrical potential difference. These reactions can be used to produce electricity and are an important area of study for the development of batteries and fuel cells.
| Characteristics | Values |
|---|---|
| Definition | Relating to the production of chemical changes using electricity, and the electricity produced by chemical changes |
| Study | Electrochemistry is the study of electricity and how it relates to chemical reactions |
| History | Electrochemistry was established in the 18th century by Italian physician and anatomist Luigi Galvani |
| Examples | Electrochemical cells, electrochemical oxidation, electrochemical signals, electrochemical membrane potential, electrochemical tests, electrochemical devices, electrochemical processes |
| Applications | Electrochemistry is used in batteries, fuel cells, and instrumentation |
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What You'll Learn
Electrochemical processes and electricity production
Electrochemical processes are integral to the production of electricity. Electrochemistry is a science that deals with the relationship between electricity and chemical changes. It also involves the interconversion of chemical and electrical energy.
Electrochemical cells transform chemical energy into electrical energy. This process can be expressed mathematically as the product of the cell's emf Ecell (measured in volts) and the electric charge Qele,trans transferred through the external circuit. The electric charge can be determined by multiplying the total number of electrons transferred (measured in moles) by Faraday's constant.
Electrochemical processes are used in the production of electricity in fuel cells. Fuel cells can turn the chemical energy in hydrocarbon gases or hydrogen and oxygen directly into electrical energy. This process is much more efficient than any combustion process. Fuel cells have been used to power spacecraft and are being applied to grid energy storage for the public power system.
Another example of an electrochemical process is the generation of chemical energy through photosynthesis. The coating of objects with metals or metal oxides through electrodeposition is another important electrochemical process. Electrodeposition is also used in the detection of alcohol in drunk drivers through the redox reaction of ethanol.
Electrochemical processes are also used in the production of metals like aluminium and titanium from their ores. The production of electricity through electrochemical processes is an important area of research for the development of the next generation of batteries, fuel cells, and supercapacitors. These technologies are expected to play a key role in the transition to a sustainable energy future and a carbon-free economy.
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Electrochemical cells and batteries
Electrochemistry is a branch of science that deals with the relationship between electricity and chemical changes, and the interconversion of chemical and electrical energy. Electrochemical cells are devices that generate electrical energy from chemical reactions. This process can also be reversed, with electrical energy being applied to these cells to cause chemical reactions to occur.
Electrochemical Cells
An electrochemical cell is made up of three components: a solution where redox reactions can occur, a conductor for electrons to be transferred, and a wire for electrons to move from one site to another. These cells can be galvanic (voltaic) or electrolytic. Galvanic cells are those that generate an electric current, and electrolytic cells are those that generate chemical reactions.
A battery is an electrochemical cell or a series of cells that produces an electric current. A battery consists of electrochemical cells that convert stored chemical energy into electrical energy. When two dissimilar metals are immersed in an electrolyte (a conductive liquid), the breakdown of chemicals into charged particles (ions) results in a flow of electricity when the battery is connected to an external circuit. This is called a redox reaction, which stands for the transfer of electrons.
Batteries
The number of voltaic cells (pairs of half-cells) contained in a battery may vary depending on the usage and desired voltage. Primary batteries are single-use batteries, while secondary batteries are rechargeable. Batteries are used to power a wide range of things, from flashlights to calculators and automobiles.
Examples of Electrochemical Cells and Batteries
- Fuel cells are electrochemical cells that react hydrogen fuel with oxygen or another oxidizing agent to convert chemical energy into electricity.
- Lead-acid batteries are used in automobiles to start an engine and operate electrical accessories when the engine is not running.
- Molten Carbonate Fuel Cell combines chemistry, electrochemistry, and mechanical principles.
- Alessandro Volta developed the first "voltaic cell" in 1800, consisting of alternating disks of zinc and silver with cardboard soaked in brine separating the disks.
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Electrochemical oxidation
Electrochemistry is a field of science that deals with the relationship between electricity and chemical changes, as well as the interconversion of chemical and electrical energy.
The choice of electrode material is crucial in the process. Different materials, such as titanium-platinum, graphite, boron-doped diamond (BDD), and mixed-metal oxides, exhibit varying electrical conductivity, chemical resistance, and cost. BDD electrodes offer high chemical and electrochemical stability, good conductivity, and excellent corrosion resistance. The manufacturing process for BDD electrodes, however, tends to be costly. On the other hand, mixed-metal oxides, also known as dimensionally stable anodes, are widely used in the electrochemical process industry due to their effectiveness in promoting chlorine and oxygen evolution.
The process of electrochemical oxidation involves submerging a pair of conductive electrode elements into a process stream and applying a low electrical current. The electrons leaving the anode initiate a series of oxidation reactions, breaking down contaminants through successive direct and indirect reactions. The process is carefully controlled to ensure no harmful by-products are produced and to comply with strict regulations.
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Electrochemical signals in the human body
Electrochemistry is a science that deals with the relationship between electricity and chemical changes, and the interconversion of chemical and electrical energy. Electrochemical signals in the human body are generated by the movement of ions across nerve cell membranes, which creates a membrane potential. This potential can be measured by recording the voltage between the inside and outside of nerve cells.
The human body can be considered an ionic solution, containing atoms such as sodium, chlorine, and potassium, which can easily lose or gain electrons. When these atoms are in a liquid medium, such as the human body, they can function as charge carriers, carrying electrical currents and creating electrical or bio-potential potentials. The nervous system is responsible for exchanging information between different parts of the body using these two types of potentials.
Nerve cells, or neurons, generate electrical signals that transmit information. Although they are not intrinsically good conductors of electricity, they have evolved mechanisms for generating electrical signals based on the flow of ions. Neurons typically generate a negative potential, called the resting membrane potential, which can be abolished by the action potential, creating a transiently positive transmembrane potential. Action potentials are the fundamental signals that carry information in the nervous system, and they are propagated along the length of axons.
The human body is full of devices that generate fixed electrical potentials or produce electrical signals with special characteristics. These signals can be measured, captured, and used in external devices, or they can be interfered with by generating external control signals. For example, external signals can stimulate the nerves, causing sensations ranging from a simple tingling sensation to pain or even organ paralysis. In the brain, these signals can induce diverse sounds, images, and behaviors. This knowledge has led to the development of technologies such as cardiac pacemakers, implantation of chips to correct Parkinson's disease, and Transcutaneous Electrical Nerve Stimulation (TENS) for pain inhibition.
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Electrochemical reactions and corrosion resistance
Electrochemistry is a field of science that deals with the relationship between electricity and chemical changes, as well as the interconversion of chemical and electrical energy. Electrochemical reactions involve the transfer of electrons and can be used to produce electricity.
Electrochemical corrosion is the degradation of a material due to its reaction with the surrounding environment. This type of corrosion occurs when there is a transfer of electrons between a metal surface and a liquid electrolyte solution, resulting in the deterioration of the substrate. Corrosion is an ongoing electrochemical process driven by the high tendency of metals to react electrochemically with oxygen, water, and other substances in the atmosphere. The majority of corrosion processes observed in rotating equipment are metal corrosion in an aqueous environment, which is an electrochemical corrosion process requiring the flow of electricity between anodic and cathodic areas.
The first condition necessary for electrochemical corrosion to occur is that both the metal and the aqueous media show little electrical resistivity. Metals with higher positions in the electromotive series, such as those at the top of the series, are more corrosion-resistant. Noble gold alloy wires, for example, are no longer used in orthodontics due to their corrosion resistance. Metals with lower positions in the series, such as iron, are more active and less resistant to corrosion.
The formation of a passivating film, or cover film, on a metal surface can help prevent electrochemical corrosion. Metal aluminum oxide and titanium oxide are commonly used industrial products that can resist both electron and ion streams, providing good protection against corrosion. Iron carbonate film also has high stability and adhesion to metal, making it resistant to electrochemical corrosion. However, the presence of hydrogen sulfide can reduce the stability of iron carbonate film, and fluid perturbation can decrease the ionic concentration at the metal surface, accelerating the electrochemical reaction and aggravating corrosion.
Understanding the nature of electrochemical reactions is crucial for inhibiting corrosion and reducing its impact. Corrosion has significant economic, health, safety, technological, and cultural consequences, with an estimated annual cost of $276 billion in the U.S. alone, according to a 2001 report.
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Frequently asked questions
Electrochemistry is a branch of physical chemistry that deals with the relationship between electrical potential difference and identifiable chemical change.
An electrochemical reaction is a process caused or accompanied by the passage of an electric current, involving the transfer of electrons between two substances, one solid and the other a liquid.
Electrochemical reactions include the oxidation of various fuels, the corrosion of materials, and the transmission of information via neurons in our body.
Electrochemistry studies the production of chemical changes using electricity and the electricity produced by chemical changes. This movement of electrons is what we refer to as electricity.
Electrochemistry has a wide range of applications, including batteries, fuel cells, and radiation detection. It also plays a crucial role in understanding biological processes, such as nerve and muscle function.
