Site Defects and Structural Alignment Enhance Interfacial Charge Mobility in Heterostructured Carbon Nitride Catalysts
Teodor Jianu, Horaţiu Szalad, Vladimir Roddatis, Markus Antonietti, Nadezda V. Tarakina
TL;DR
Researchers found that aligning carbon nitride layers improves charge transfer at their interface, enhancing catalytic performance for oxygen reduction.
Contribution
A workflow was developed to correlate charge behavior with chemistry and structure at organic interfaces, revealing nanoscale mechanisms in carbon nitride heterojunctions.
Findings
PHI crystallites grow on PTI layers with crystallographic alignment, promoting charge transfer.
Quaternary nitrogen atoms in the heterojunction aid O2 adsorption and 2e– reduction to H2O2.
Terminal and bridging nitrogen atoms promote charge separation during the oxygen reduction reaction.
Abstract
Engineering interfaces between organic semiconductors is an effective way to tailor organic electronic device performance, as charge transport and light interaction efficiency are strongly influenced by electronic coupling at molecular interfaces. Scanning transmission electron microscopy is routinely used to analyze interfaces at the atomic scale; however, its use for organic materials is limited due to the electron beam sensitivity of organic molecules, buried interfaces, and the semicrystalline nature of organics. In this work, we developed a workflow to correlate charge behavior at organic interfaces with their chemistry and structure, even when interface components are chemically and structurally similar and mixed at the nanoscale. We used this workflow to reveal the nanoscale mechanism behind enhanced charge transfer at the heterojunction between two-dimensional carbon nitride…
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Taxonomy
TopicsOrganic Electronics and Photovoltaics · Advanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells