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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Bonding in Metals02:32

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.

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Updated: May 31, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Splitting water with cobalt.

Vincent Artero1, Murielle Chavarot-Kerlidou, Marc Fontecave

  • 1Laboratoire de Chimie et Biologie des Métaux, Université Joseph Fourier, Grenoble, CNRS, UMR 5249, CEA, DSV/iRTSV/LCBM, CEA-Grenoble, Grenoble, France. vincent.artero@cea.fr.

Angewandte Chemie (International Ed. in English)
|July 13, 2011
PubMed
Summary

Cobalt catalysts offer a sustainable solution for producing hydrogen fuel from water using sunlight. These catalysts, when paired with photosensitizers, create efficient photocatalytic systems for renewable energy generation.

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Area of Science:

  • Renewable Energy
  • Catalysis
  • Photochemistry

Background:

  • Sustainable energy solutions are crucial for future energy supply.
  • Hydrogen production via water splitting is a promising renewable energy strategy.
  • Cobalt has emerged as a versatile non-noble metal for catalytic applications.

Purpose of the Study:

  • To explore the use of cobalt-based catalysts for efficient hydrogen production.
  • To develop photocatalytic systems for light-driven water splitting.
  • To advance sustainable energy conversion and storage technologies.

Main Methods:

  • Development of synthetic cobalt catalysts for hydrogen and oxygen evolution.
  • Coupling of catalysts with photosensitizers to create photocatalytic systems.
  • Investigation of light-induced hydrogen evolution from water.

Main Results:

  • Cobalt catalysts demonstrate versatility in H(2)- and O(2)-evolving reactions.
  • Photocatalytic systems effectively utilize light for hydrogen evolution.
  • Progress in designing efficient systems for renewable energy conversion.

Conclusions:

  • Cobalt-based catalysts are key to developing efficient artificial photosynthesis systems.
  • Photocatalytic water splitting offers a sustainable route to hydrogen fuel production.
  • Further research into catalyst design can optimize renewable energy systems.