Three-dimensional covalent organic framework with tty topology for enhanced photocatalytic hydrogen peroxide production

Recent Progress on Phase Engineering of Nanomaterials

“…In the phases of the 6-connected stereo node extension, the trigonal node ( D 3 h ) produces the acs , stp , ceq , and hea phases, while the anti-hexagonal ( D 3 d ) node produces the pcu phase, and the titanium-based C 3 -symmetric node constructs the rare soc and spn phases. Recently, a series of high-valency 8-connected tetragonal D 4 h -symmetryic steric nodes has been developed using the steric hindrance effect to force the rotation of the side chain, ,− and imine-linked bcu and scu phases were obtained, providing a new avenue for the development of high-valency 3D COFs. Importantly, the use of precise dihedral angle adjustment between planar building blocks also allows for a variety of 3D extension structures including ffc , fjh , and tbo generated via the [4+3] strategy, lvt generated by the [4+4] strategy, and she generated by the [6+4] strategy.…”

Reticular chemistry within three-dimensional covalent organic frameworks for multiple applications

“…51 Under the guidance of reticular chemistry, thousands of possible topological structures in 3D COFs can be theoretically predicted according to the Reticular Chemistry Structure Resource (RCSR) database. 52 However, only 29 topologies ( ctn , 30 bor , 30 dia , 53 pts , 54 rra , 55 ffc , 33 lon , 31 srs , 56 acs , 35 bcu , 36 fjh , 57 stp , 47 tbo , 34 ceq , 58 hea , 59 ljh , 32 nbo , 60 pcu , 48 soc , 61 flu , 62 pcb , 50 scu , 63 she , 64 spn , 65 sql-c , 66 lvt , 67 mhq-z , 68 pto , 68 and tty 69 ) have been reported in 3D COFs to date (Fig. 2), with numerous 3-periodic topologies to be further explored.…”

Anthraquinone-Based Conjugated Organic Polymers Containing Dual Oxidation Centers for Photocatalytic H2O2 Production from H2O and O2 under Visible-Light Irradiation

“…Conjugated organic polymer (COP) semiconductors with high specific surface area, visible light response, and good tunability have emerged as promising complements to their inorganic-based counterparts. − The molecularly controllable structures provide plentiful options for photocatalytic applications to fine-tune porosity, electron/band structure, active sites, and interface properties. , Since COP-based photocatalysts were reported for photocatalytic H 2 O 2 production in 2020, COP-based materials have attracted increasing attention in photocatalytic H 2 O 2 generation. − Nonetheless, photocatalytic H 2 O 2 synthesis in pure water remains a great challenge due to ineffective hole scavenging via H 2 O oxidation and the resulting charge recombination . To overcome this problem, several strategies for promoting H 2 O oxidation and suppressing charge recombination have been reported. − For example, creating π-conjugated frameworks with electron donor–acceptor moieties, incorporating H 2 O-philic groups, doping heteroatoms, and so forth, but the unsatisfactory water oxidation efficiencies are still the major factor for low photocatalytic H 2 O 2 efficiency from H 2 O and O 2 in net water with no additives.…”