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Related Concept Videos

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...
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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.
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...
Catalysis01:27

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...
Catalysis02:50

Catalysis

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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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Efficient light-driven carbon-free cobalt-based molecular catalyst for water oxidation.

Zhuangqun Huang1, Zhen Luo, Yurii V Geletii

  • 1Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States.

Journal of the American Chemical Society
|January 28, 2011
PubMed
Summary

A new cobalt-based polyoxometalate complex efficiently catalyzes water oxidation using visible light. This abundant-metal catalyst shows high performance, surpassing precious-metal alternatives in photocatalytic water splitting.

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Area of Science:

  • Inorganic Chemistry
  • Photocatalysis
  • Sustainable Energy

Background:

  • Water oxidation is crucial for artificial photosynthesis and renewable energy.
  • Developing efficient, stable, and cost-effective catalysts is essential.
  • Polyoxometalates offer tunable structures for catalytic applications.

Purpose of the Study:

  • To synthesize and characterize a novel abundant-metal-based polyoxometalate catalyst.
  • To evaluate its efficiency and stability for visible-light-driven water oxidation.
  • To compare its performance against existing precious-metal catalysts.

Main Methods:

  • Synthesis of the cobalt-based polyoxometalate complex [Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-).
  • Photocatalytic water oxidation experiments using a photosensitizer and sacrificial electron acceptor.
  • Spectroscopic and electrochemical characterization of the catalyst.
  • Performance evaluation at pH 8 under visible light irradiation.

Main Results:

  • The cobalt-based polyoxometalate complex demonstrated high hydrolytic and oxidative stability.
  • The catalyst achieved a 30% photon-to-O(2) yield and a turnover number >220.
  • Performance was superior to a previously reported ruthenium-based polyoxometalate catalyst.

Conclusions:

  • Abundant-metal polyoxometalates are promising catalysts for efficient water oxidation.
  • Visible-light-driven water splitting using this cobalt complex offers a sustainable alternative.
  • This catalyst represents a significant advancement over precious-metal-based systems.