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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Electrolysis03:00

Electrolysis

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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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Limiting Reactant02:27

Limiting Reactant

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The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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Efficient H2O2 Synthesis Through a Two-Electron Oxygen Reduction Reaction by Electrocatalysts.

Huatian Chen1, Runxuan Chen1, Sha Liu1

  • 1Center for Advanced Materials Research & College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, China.

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|July 16, 2024
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Summary

Efficient electrocatalysts are key for sustainable hydrogen peroxide (H2O2) production via the two-electron oxygen reduction reaction (2e-ORR). This review covers recent advancements in 2e-ORR catalysts for H2O2 electrosynthesis.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • The two-electron oxygen reduction reaction (2e-ORR) offers a sustainable route for hydrogen peroxide (H2O2) production, presenting an alternative to the energy-intensive anthraquinone process.
  • Developing efficient electrocatalysts is crucial for advancing localized H2O2 synthesis, emphasizing the need for high activity, selectivity, and stability.

Purpose of the Study:

  • This review comprehensively summarizes recent progress in electrocatalyst development for in-situ H2O2 production via the 2e-ORR pathway.
  • It aims to provide a detailed overview of catalyst design, fabrication, and the investigation of active sites influencing H2O2 selectivity.

Main Methods:

  • The review analyzes various classes of electrocatalysts, including pure metals/alloys, transition metal compounds, single-atom catalysts, and carbon-based materials.
  • It discusses the design principles and fabrication strategies for these catalysts tailored for the 2e-ORR.

Main Results:

  • Recent advancements have shown significant potential in various electrocatalyst types for efficient H2O2 electrosynthesis.
  • Understanding catalytic mechanisms and active sites is vital for optimizing selectivity and stability in the 2e-ORR.

Conclusions:

  • Significant challenges and opportunities exist in H2O2 electrosynthesis, requiring further research into catalyst design and reaction mechanisms.
  • Future research should focus on enhancing electrocatalyst performance and exploring novel materials for efficient and sustainable H2O2 production.