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Electrolysis03:00

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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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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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 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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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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Computational chemistry for water-splitting electrocatalysis.

Licheng Miao1, Wenqi Jia1, Xuejie Cao1

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Computational chemistry aids in developing efficient electrocatalysts for high-purity hydrogen production via water splitting. This review explores theoretical studies, methods, and challenges in advancing electrocatalytic water electrolysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Electrocatalytic water splitting using renewable electricity is key for pure hydrogen production.
  • Practical use is hindered by the need for active, affordable, and durable electrocatalysts.

Purpose of the Study:

  • To review theoretical studies on electrocatalytic water splitting.
  • To discuss advancements in computational methods and models for electrocatalyst design.

Main Methods:

  • Literature review of theoretical studies on water splitting.
  • Analysis of computational chemistry approaches for electrocatalyst prediction.
  • Overview of benchmark descriptors for catalytic performance.

Main Results:

  • Computational chemistry offers fundamental insights into electron behavior for electrocatalyst design.
  • Established descriptors help evaluate intrinsic catalytic activity for water splitting.
  • Current computational models enable performance predictions for novel electrocatalysts.

Conclusions:

  • Theoretical studies are crucial for advancing electrocatalyst development.
  • Further research is needed to address remaining challenges in computational electrocatalysis.
  • Optimizing electrocatalysts is essential for the widespread adoption of water splitting technology.