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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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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.
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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Related Experiment Video

Updated: Jun 13, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Electronic Structure Regulated Carbon-Based Single-Atom Catalysts for Highly Efficient and Stable Electrocatalysis.

Xiaohui Sun1, Peng Zhang1, Bangyan Zhang1

  • 1State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing, 102249, China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 10, 2024
PubMed
Summary

Regulating the electronic structure of single-atom catalysts (SACs) enhances their performance in electrocatalysis. This review details strategies and their impact on reactions like water splitting and CO2 reduction.

Keywords:
carbon substratescatalytic performanceelectrocatalysiselectronic structuresingle atom catalyst

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Single-atom catalysts (SACs) offer high atomic utilization and catalytic performance on carbon substrates.
  • Precisely controlling the electronic structure of single-atom sites is key to optimizing electrocatalytic activity.
  • Understanding the fundamental principles linking electronic structure to SACs' intrinsic activity remains a challenge.

Purpose of the Study:

  • To summarize strategies for regulating the electronic structure of carbon-based SACs.
  • To discuss the impact of electronic structure on reactive intermediate activation and key electrocatalytic reactions.
  • To elucidate the electronic structure-performance relationships in SACs for electrochemical applications.

Main Methods:

  • Summarizing strategies: nonmetal heteroatom doping, coordination number regulation, defect engineering, strain design, and dual-metal-site design.
  • Discussing impacts on water splitting, oxygen reduction reaction, and CO2/N2 electroreduction reactions.
  • Combining characterization techniques with density functional theory (DFT) calculations to understand structure-performance relationships.

Main Results:

  • Various strategies effectively regulate the electronic structure of carbon-based SACs.
  • Electronic structure significantly influences the activation of reactive intermediates and overall electrocatalytic activity.
  • Clear electronic structure-performance relationships were established for key electrochemical reactions.

Conclusions:

  • A comprehensive understanding of electronic structure-correlated electrocatalytic activity in SACs has been achieved.
  • This review provides insights into challenges and future prospects for advancing SACs in electrochemistry.
  • Optimizing electronic structure is a crucial pathway for developing high-performance SACs.