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Related Concept Videos

Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
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Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Related Experiment Video

Updated: Jun 13, 2026

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
08:15

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Published on: February 7, 2017

Modulation strategies for acidic oxygen evolution catalysts.

Feifei Teng1, Zhenlu Wang1, Jingqi Guan1

  • 1Institute of Physical Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China wzl@jlu.edu.cn guanjq@jlu.edu.cn.

Chemical Science
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Proton exchange membrane water electrolysis (PEMWE) requires efficient catalysts for the oxygen evolution reaction (OER). This study reviews acidic OER catalysts, focusing on enhancing activity and durability for clean hydrogen production.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Proton exchange membrane water electrolysis (PEMWE) is vital for clean hydrogen generation.
  • The oxygen evolution reaction (OER) in acidic media has sluggish kinetics and catalyst instability issues.
  • Catalyst development is critical for PEMWE efficiency and lifespan.

Purpose of the Study:

  • To elucidate the mechanism of acidic OER.
  • To review noble and non-noble metal catalysts for acidic OER.
  • To analyze strategies for enhancing catalyst performance and discuss industrialization challenges.

Main Methods:

  • Systematic elucidation of acidic OER mechanisms.
  • Review of existing noble and non-noble metal catalyst research.
  • Analysis of electronic and geometric structural modification strategies for catalysts.
  • Evaluation of catalyst performance in high current density devices.

Main Results:

  • Identified sluggish kinetics and instability as key challenges in acidic OER.
  • Reviewed progress in noble and non-noble metal catalysts.
  • Highlighted electronic and geometric tuning as effective enhancement strategies.
  • Discussed performance in high current density applications.

Conclusions:

  • Developing highly active and durable acidic OER catalysts is essential for PEMWE.
  • Strategies involving structural and electronic modifications show promise.
  • Addressing industrialization bottlenecks is crucial for large-scale PEMWE application.