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Catalysis

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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Updated: Jan 7, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

Site Defects and Structural Alignment Enhance Interfacial Charge Mobility in Heterostructured Carbon Nitride

Teodor Jianu¹, Horaţiu Szalad¹, Vladimir Roddatis²

¹Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Potsdam 14476, Germany.

|January 5, 2026

Summary

Researchers developed a new workflow to analyze organic semiconductor interfaces. This method reveals how specific crystallographic alignment enhances charge transfer in carbon nitride catalysts for improved oxygen reduction reactions.

Keywords:

ab initio simulations carbon nitrides electron diffraction organic interfaces oxygen reduction reaction valence EELS

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Published on: December 6, 2021

Area of Science:

Materials Science
Catalysis
Organic Electronics

Background:

Engineering interfaces in organic semiconductors is key for device performance.
Analyzing organic interfaces is challenging due to electron beam sensitivity and material properties.

Purpose of the Study:

To develop a workflow correlating charge behavior with chemistry and structure at organic interfaces.
To elucidate the nanoscale mechanism of enhanced charge transfer in a 2D carbon nitride heterojunction.

Main Methods:

Developed a novel workflow for analyzing nanoscale organic interfaces.
Utilized scanning transmission electron microscopy and electron energy loss spectroscopy.
Investigated heterojunctions between poly-heptazine imide (PHI) and poly-triazine imide (PTI).

Main Results:

PHI crystallites grow on PTI layers with specific [001]_PTI/[001]_K-PHI orientation.
This alignment promotes charge transfer from PTI to PHI, creating an electron-rich interface.
Identified quaternary N atoms and specific N bonding aiding O2 adsorption and H2O2 production.

Conclusions:

The developed workflow enables detailed analysis of complex organic interfaces.
Crystallographic orientation at the PHI/PTI heterojunction is crucial for efficient charge transfer.
The interface chemistry facilitates oxygen reduction reaction, producing H2O2.