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Donor–acceptor covalent organic framework hollow submicrospheres with a hierarchical pore structure for visible-light-driven H~2~ evolution by Haiping Yu; Jianze Zhang; Xiaorong Yan; Chuanguang Wu; Xiaoran Zhu; Bowen Li; Tengfei Li; Qiuquan Guo; Jiefeng Gao; Mingjun Hu; Jun Yang is a Engineering article available to read on EtoBox.
What is Donor–acceptor covalent organic framework hollow submicrospheres with a hierarchical pore structure for visible-light-driven H~2~ evolution about?
Two-dimensional (2D) covalent organic frameworks (COFs) have received much attention due to their tunable electronic structures and superior surface area in visible-light-driven water splitting. Compared to traditional photocatalysts, 2D COFs for photocatalytic water splitting show the advantages of controllable light absorption and easy carrier separation. Here, we fabricate a highly crystalline 2D COF with hierarchical pore structures and donor-acceptor (D-A) moieties consisting of electron donor tetraphenylethylene (4PE) and electron acceptor thiazolo [5,4-d]thiazole (TZ), the PETZ-COF. Owing to the specific molecular configuration and microstructures, the PETZ-COF demonstrates remarkable properties in visible-light-driven H 2 evolution and a suitable energy band structure for O 2 generation. The PETZ-COF shows an excellent hydrogen evolution rate of 7324.3 mmol g À1 h À1 in the presence of a Pt co-catalyst and using ascorbic acid as the hole sacrificial reagent. Density functional theory (DFT) calculations show that the site with the lowest hydrogen-binding free energy (DG H\* ) is the N atom in the -N]C-(À0.0418 eV) group, which suggests that the electron withdrawing-pushing i
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- Author
- Haiping Yu; Jianze Zhang; Xiaorong Yan; Chuanguang Wu; Xiaoran Zhu; Bowen Li; Tengfei Li; Qiuquan Guo; Jiefeng Gao; Mingjun Hu; Jun Yang
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2022
- Language
- EN
- Field
- Engineering (Physical Sciences)