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Related Concept Videos

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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A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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WhereWulff: A Semiautonomous Workflow for Systematic Catalyst Surface Reactivity under Reaction Conditions.

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WhereWulff, a new workflow, streamlines catalyst surface modeling by prioritizing stable surfaces, significantly reducing computational costs for oxygen evolution reaction (OER) studies.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Catalysis

Background:

  • Modeling catalyst surface reactivity is crucial for developing efficient energy conversion technologies.
  • Traditional methods often involve extensive computational resources and manual prioritization.

Purpose of the Study:

  • To introduce WhereWulff, a semiautonomous workflow for modeling catalyst surface reactivity.
  • To reduce the computational burden of materials discovery for catalytic applications.

Main Methods:

  • The workflow integrates bulk optimization and surface chemistry tasks.
  • It enumerates surfaces, computes relaxed surface energies, and prioritizes them based on Wulff construction.
  • Automated job submission, analysis, and resource constraint management are included.

Main Results:

  • WhereWulff reduced Density Functional Theory (DFT) calculations by nearly half (from ~240 to ~132) for oxygen evolution reaction (OER) intermediates.
  • The workflow successfully managed over 180 resubmission jobs for large systems under cluster constraints.
  • Prioritization based on surface stability and Wulff construction significantly improved efficiency.

Conclusions:

  • WhereWulff offers a computationally efficient approach to modeling catalyst surfaces.
  • It serves as a valuable tool for materials discovery, data generation, and education in catalysis.
  • The workflow can be extended for various reactions beyond OER.