2,4,6-Triphenyl-1,3,5-Triazine Based Covalent Organic Frameworks for Photoelectrochemical H2 Evolution

Chunhui Dai, Ting He, Lixiang Zhong, Xingang Liu, Wenlong Zhen, Can Xue, Shuzhou Li, Donglin Jiang*, Bin Liu*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

49 Citations (Scopus)

Abstract

Photoelectrochemical water splitting over semiconductors offers a sustainable solar light conversion technique capable of alleviating worldwide energy crisis. Conjugated polymers have recently received increasing attention as a class of promising photoelectrode materials due to their advantages of earth-abundance, non-toxicity, light weight, and molecularly tunable functionalities, etc. However, the development of highly efficient organic photoelectrodes remains a big challenge. In this study, two covalent organic frameworks (COFs) incorporated 2,4,6-triphenyl-1,3,5-triazine are demonstrated as excellent photocathodes for H2 production. By introducing 2,4,6-triphenylbenene to properly create donor/acceptor pairs within COF, a significantly enhanced visible-light photocurrent of TAPB-TTB COF (110 µA cm−2) compared to TTA-TTB COF (35 µA cm−2) at 0 V versus reversible hydrogen electrode (RHE) is obtained without adding organic sacrificial agent and metal cocatalysts (>420 nm). The enhanced photocurrent density is attributed to the narrowed bandgap and improved charge transfer by intramolecular donor–acceptor combination. This work highlights the great promising applications of crystalline donor–acceptor COFs as high-efficiency organic photoelectrode for water splitting.

Original languageEnglish
Article number2002191
JournalAdvanced Materials Interfaces
Volume8
Issue number7
DOIs
Publication statusPublished - 9 Apr 2021
Externally publishedYes

Keywords

  • 2,4,6-triphenyl-1,3,5-triazine
  • H evolution
  • covalent organic frameworks
  • photoelectrochemical

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