Physics and Chemistry of Two-Dimensional Triangulene-Based Lattices DOI Creative Commons
Hongde Yu, Yu Jing, Thomas Heine

et al.

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 58(1), P. 61 - 72

Published: Dec. 10, 2024

ConspectusTriangulene (TRI) and its heterotriangulene (HT) derivatives are planar, triangle-shaped molecules that, via suitable coupling reactions, can form extended organic two-dimensional (2D) crystal (O2DC) structures. While TRI is a diradical, HTs either closed-shell or monoradicals which be stabilized in their cationic form.Triangulene-based O2DCs have characteristic honeycomb-kagome lattice. This structure gives rise to four electronic bands: two of them Dirac points, while the other flat sandwich bands. Functionalization heteroatoms means engineer this band structure. Heteroatoms like boron nitrogen shift Fermi level upward downward, respectively, bridging groups functionalized triangulene edges introduce dispersion bands.The stable backbone architecture makes 2D HT-polymers ideal for photoelectrochemical applications: (i) bridge functionalization tune gap maximize absorption, (ii) choice center atom (B N) controls occupation shifts with respect vacuum, allowing some cases overpotential-free photon-driven surface (iii) large area allows high flux educts products.The spin polarization open-shell maintained when linking dimers frameworks direct more elaborate (acetylene, diacetylene, phenyl). The spin-polarization energy strongly magnetically coupled, resulting high-spin broken-symmetry (BS) low-spin systems. As O2DCs, systems become antiferromagnetic Mott insulators gaps, others show Stoner ferromagnetism, maintaining bands but shifting opposite spin-polarized different energies. For based on aza- boratriangulene (monoradicals as building blocks), shifted point, Curie temperature about 250 K. half-filled (all-carbon) systems, Ovchinnikov rule or, equivalently, Lieb's theorem, sufficient predict magnetic ordering non-half-filled (i.e., those heteroatoms) obey involved Goodenough-Kanamori interpret magnetism grounds fundamental interactions.There remain challenges experiment theory advance field triangulene-based O2DCs: Coupling reactions beyond chemistry developed allow highly ordered, crystals. Multilayer structures, unexplored date, will inevitable alternative synthesis approaches. predictive power density-functional (DFT) within state-of-the-art functionals limited description couplings these due apparent multireference character spatial extension centers.

Language: Английский

Enhancing the Performance of Fluorinated Graphdiyne Moisture Cells via Hard Acid‐Base Coordination of Aluminum Ions DOI Open Access
Xiaoyan Wei, Danyang He, Yanan Yang

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Moisture‐enabled electric generators (MEGs) are emerging as a transformative energy technology, capable of directly converting ambient moisture into electrical without producing pollutants or harmful emissions. However, the widespread application MEGs is hindered by challenges such intermittent output and low current densities, which limit power density prevent large‐scale integration. Here, novel cell based on Al ion‐F coordination—specifically, fluorinated graphdiyne (FGDY) Al‐ion (FGDY AlMC) introduced. This new achieves an exceptionally high mass‐specific 371.36 µW g − ¹, stable (0.65 V for 15 h), broad applicability across varying humid environments. Density functional theory (DFT) calculations reveal that large‐pore molecular structure FGDY significantly reduces diffusion barriers ions compared to other 2D carbon materials. Furthermore, F atoms “hard base” effectively coordinate with acid” ions, enhancing ionic conductivity, accelerating ion migration, promoting generation higher number mobile cations. These combined advantages lead marked improvement in performance AlMC. findings position coordinated highly promising candidate development high‐performance MEG active

Language: Английский

Citations

0
Review on properties, physics, and fabrication of two-dimensional material-based metal-matrix composites (2DMMCs) for heat transfer systems DOI Creative Commons
Hyun-Jong Lee, Amir Ardeshiri Lordejani,

Leonore van Goor

et al.

Renewable and Sustainable Energy Reviews, Journal Year: 2025, Volume and Issue: 217, P. 115700 - 115700

Published: April 23, 2025

Language: Английский

Citations

0
Surfactant‐Assisted Construction of Covalent Organic Frameworks DOI Creative Commons
Yuan Li,

Qingqing Zhang,

Zhendong Dai

et al.

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 27, 2025

Abstract Covalent organic frameworks (COFs), characterized by their unique ordered pore structures, chemical diversity, and high degree of designability, have demonstrated immense application potential across multiple fields. However, traditional synthesis methods often encounter challenges such as low crystallinity uneven morphology. The introduction surfactants has opened up new pathways for the COFs. Leveraging intermolecular interactions self‐assembly properties, can effectively regulate nucleation, growth processes, ultimate structure properties This paper systematically reviews latest research achievements future trends in surfactant‐assisted COF synthesis, emphasizing crucial role key additives preparation Surfactants not only facilitate uniform nucleation COFs, enhancing structural order products but also enable precise diverse regulation dimensionality, morphology, Furthermore, influencing dispersion processability enhance practicality workability. Finally, presents some prospects opportunities this emerging area.

Language: Английский

Citations

0
Enhancing Selective Ion Transport by Stacking Covalent Organic Framework Monolayers DOI

Shixian Xin,

Ying Yue, Han Xie

et al.

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

Abstract Nanopore‐based power generation represents an efficient way for harvesting salinity gradient energy. Due to its ultrahigh ion conductivity and moderate selectivity, the crystalline covalent organic framework (COF) monolayer demonstrates record‐high output density by mixing river water seawater. To further improve energy conversion performance, it is necessary enhance selectivity while achieving high membrane permeability. Here, a layer‐by‐layer stacking approach developed notably selective transport of ultra‐thin COF layers, offering advantageous in both efficiency scalability. Under standard NaCl (0.5 M/0.1 M), ratio ionic mobility between Cl − Na + increases from 1.4 2.9 with anion‐selective one ten leading more than seven‐fold enhancement osmotic efficiency. By maximizing permeability, can reach 411 pW three layers single device. This strategy provides effective integration atomically thin membranes mass applications.

Language: Английский

Citations

0
Physics and Chemistry of Two-Dimensional Triangulene-Based Lattices DOI Creative Commons
Hongde Yu, Yu Jing, Thomas Heine

et al.

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 58(1), P. 61 - 72

Published: Dec. 10, 2024

ConspectusTriangulene (TRI) and its heterotriangulene (HT) derivatives are planar, triangle-shaped molecules that, via suitable coupling reactions, can form extended organic two-dimensional (2D) crystal (O2DC) structures. While TRI is a diradical, HTs either closed-shell or monoradicals which be stabilized in their cationic form.Triangulene-based O2DCs have characteristic honeycomb-kagome lattice. This structure gives rise to four electronic bands: two of them Dirac points, while the other flat sandwich bands. Functionalization heteroatoms means engineer this band structure. Heteroatoms like boron nitrogen shift Fermi level upward downward, respectively, bridging groups functionalized triangulene edges introduce dispersion bands.The stable backbone architecture makes 2D HT-polymers ideal for photoelectrochemical applications: (i) bridge functionalization tune gap maximize absorption, (ii) choice center atom (B N) controls occupation shifts with respect vacuum, allowing some cases overpotential-free photon-driven surface (iii) large area allows high flux educts products.The spin polarization open-shell maintained when linking dimers frameworks direct more elaborate (acetylene, diacetylene, phenyl). The spin-polarization energy strongly magnetically coupled, resulting high-spin broken-symmetry (BS) low-spin systems. As O2DCs, systems become antiferromagnetic Mott insulators gaps, others show Stoner ferromagnetism, maintaining bands but shifting opposite spin-polarized different energies. For based on aza- boratriangulene (monoradicals as building blocks), shifted point, Curie temperature about 250 K. half-filled (all-carbon) systems, Ovchinnikov rule or, equivalently, Lieb's theorem, sufficient predict magnetic ordering non-half-filled (i.e., those heteroatoms) obey involved Goodenough-Kanamori interpret magnetism grounds fundamental interactions.There remain challenges experiment theory advance field triangulene-based O2DCs: Coupling reactions beyond chemistry developed allow highly ordered, crystals. Multilayer structures, unexplored date, will inevitable alternative synthesis approaches. predictive power density-functional (DFT) within state-of-the-art functionals limited description couplings these due apparent multireference character spatial extension centers.

Language: Английский

Citations

1