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Electrochemistry: Overview01:04

Electrochemistry: Overview

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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Electrocatalysis: A Core Technique for a Sustainable Future.

Zhichuan J Xu1, Xun Wang2

  • 1School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 14, 2020
PubMed
Summary
This summary is machine-generated.

Electrocatalysis is crucial for a sustainable future, enabling fossil fuel-free energy systems. It powers hydrogen production via water electrolysis and closed carbon cycles through CO2 electrolysis for zero-emission goals.

Keywords:
electrocatalysiselectrochemistrygreen chemistrysustainabilityzero-carbon emission

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Area of Science:

  • Sustainable Energy Technologies
  • Electrocatalysis and Electrochemistry

Background:

  • The transition to a sustainable energy infrastructure necessitates the phasing out of fossil fuels.
  • Electrocatalysis offers a viable pathway towards achieving zero-carbon emissions.

Discussion:

  • Electrocatalysis is central to proposed sustainable energy systems.
  • These systems include hydrogen-based energy (solar water electrolysis, fuel cells) and closed carbon cycles (CO2 electrolysis).

Key Insights:

  • Electrocatalysis is indispensable for developing fossil fuel-free energy infrastructures.
  • It enables key processes like hydrogen generation and carbon dioxide utilization.

Outlook:

  • Further advancements in electrocatalysis are essential for realizing a sustainable, zero-emission energy future.
  • Research in electrocatalytic processes will drive innovation in renewable energy.