Band Gap Tuning of Covalent Triazine‐Based Frameworks through Iron Doping for Visible‐Light‐Driven Photocatalytic Hydrogen Evolution
Shengjie Gao, Peng Zhang, Guocheng Huang, Qiaoshan Chen, Jinhong Bi, Ling Wu
Abstract
Abstract Photocatalytic hydrogen energy production through water splitting paves a promising pathway for alleviating the increasingly severe energy crisis. Seeking affordable, highly active, and stable photocatalysts is crucial to access the technology in a sustainable manner. Herein, a trivalent iron‐doped covalent triazine‐based framework (CTF‐1) was elaborately designed in this study to finely tune the band structure and photocatalytic activity of CTF‐1 for H 2 production. With optimal doping amount, Fe 10 /CTF‐1 exhibited a satisfying H 2 production activity of 1460 μmol h −1 g −1 , corresponding to 28‐fold enhancement compared with pure CTF‐1. The Fe 3+ doping is responsible for a remarkedly broadened visible‐light adsorption range, improved reduction ability and inhibited electron–hole recombination of CTF‐1. Specifically, the doped Fe 3+ could serve as photocatalytically active center and “electron relay” to accelerate charge separation and transformation. This study offers a feasible strategy to validly design and synthesize CTF‐based photocatalytic materials to efficiently utilize solar energy.