Strong‐Base‐Assisted Synthesis of a Crystalline Covalent Triazine Framework with High Hydrophilicity via Benzylamine Monomer for Photocatalytic Water Splitting

Abstract

Methods to synthesize crystalline covalent triazine frameworks (CTFs) are limited and little attention has been paid to development of hydrophilic CTFs and photocatalytic overall water splitting. A route to synthesize crystalline and hydrophilic CTF‐HUST‐A1 with a benzylamine‐functionalized monomer is presented. The base reagent used plays an important role in the enhancement of crystallinity and hydrophilicity. CTF‐HUST‐A1 exhibits good crystallinity, excellent hydrophilicity, and excellent photocatalytic activity in sacrificial photocatalytic hydrogen evolution (hydrogen evolution rate up to 9200 μmol g−1 h−1). Photocatalytic overall water splitting is achieved by depositing dual co‐catalysts in CTF‐HUST‐A1, with H2 evolution and O2 evolution rates of 25.4 μmol g−1 h−1 and 12.9 μmol g−1 h−1 in pure water without using sacrificial agent.

Modulating Benzothiadiazole‐Based Covalent Organic Frameworks via Halogenation for Enhanced Photocatalytic Water Splitting

“…Covalent organic frameworks (COFs) with high crystallinity have emerged as promising alternatives to inorganic semiconductors for photocatalytic water splitting . Recently, to achieve highly photoactive COFs toward efficient sunlight‐driven H 2 conversion, many strategies on improving photon capture and facilitating charge carrier separation have been developed through integrating various novel π‐conjugated building blocks, utilizing proper donor–acceptor (D‐A) combinations and depositing new co‐catalysts .…”

Conjugated Polymer Nanomaterials for Solar Water Splitting

“…reported that the presence of dual cocatalysts on the crystalline covalent triazine framework nanosheets could dramatically promote H 2 and O 2 evolution. [ 26 ] With 4.5 wt% NiPx and 3.0 wt% Pt as cocatalysts, the polymer nanosheets achieved HER and OER of 25.4 and 12.9 µmol h −1 g −1 , respectively, in pure water. This is a relatively new field but very attractive because it focuses on pure water splitting without using any sacrificial agent, so that photoinduced electrons and holes could be fully utilized to produce value‐added products.…”

Theoretical advances in two-dimensional materials for photocatalytic water splitting

“…尽管在 理论上已经证实单层Zr 2 CO 2 和Hf 2 CO 2 可用于全光解 水 [42] , 但是在实验上合成单层的MXene仍然是一个艰 [66,67] . 人们已经 探索了由三嗪和苯环搭建的共价三嗪框架(covalent triazine framework, CTF)在光解水中的应用 [68,69] . 尤其, CTF-1已经在实验上证实是全光解水的催化剂 [68] .…”