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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Balancing Redox Equations02:58

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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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Redox Reactions01:24

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Redox Titration: Overview01:21

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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Cellular Redox Profiling Using High-content Microscopy
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Nanostructured Bifunctional Redox Electrocatalysts.

Min Kuang1, Gengfeng Zheng2

  • 1Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 8, 2016
PubMed
Summary
This summary is machine-generated.

This review explores bifunctional electrocatalysts for renewable energy, focusing on oxygen reduction/evolution (ORR/OER) and hydrogen evolution/oxygen evolution (HER/OER) reactions. It highlights recent advancements, mechanisms, and design principles for improved performance.

Keywords:
bifunctionalelectrocatalystshydrogen evolution reactionoxygen evolution reactionoxygen reduction reaction

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Area of Science:

  • Advanced materials science and electrochemistry.
  • Focus on catalysts for renewable energy applications.

Background:

  • Electrocatalysts are crucial for renewable energy devices.
  • Individual catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) have a history of development.
  • Bifunctional electrocatalysts for ORR/OER or HER/OER are emerging as a research hotspot.

Purpose of the Study:

  • To review recent developments in bifunctional electrocatalysts for ORR/OER and HER/OER reactions.
  • To provide insights into theoretical understanding through analysis and comparison of various bifunctional electrocatalysts.
  • To present reaction mechanisms and activity descriptors for these reactions.

Main Methods:

  • Literature review and analysis of recent advancements in bifunctional electrocatalyst research.
  • Comparison of different bifunctional electrocatalyst series and their performance.
  • Discussion of design principles and theoretical underpinnings.

Main Results:

  • Detailed discussion of various bifunctional electrocatalysts with significantly improved performance.
  • Outline of design principles leading to enhanced catalytic activity.
  • Presentation of insights into reaction mechanisms and activity descriptors.

Conclusions:

  • Bifunctional electrocatalysts show great promise for efficient renewable energy conversion.
  • Understanding reaction mechanisms and activity descriptors is key to designing better catalysts.
  • Future research should focus on overcoming existing challenges to further enhance catalyst performance.