Partially H-bonded covalent organic frameworks for photocatalytic hydrogen evolution
作者:Wenbo Dong、Yueyuan Xiao、Zhiying Qin、Bo Qiao、Longyu Li
DOI:10.1039/d3ta01944f
日期:——
resulting in the best hydrogenevolution rate (678 μmol g−1 h−1) under visible light irradiation. Moreover, the hydrogen-bonding interactions help to enhance the stability of COFs during photocatalysis. This study demonstrates that partial H-bonding can lead to a better photocatalytic H2 evolution, providing insight into the further design of efficient COF-based photocatalysts for H2 evolution.
光催化被认为是解决全球能源问题最有效的方法之一。因此,阐明高效光催化剂的设计和合成原理至关重要。在本文中,我们报告了一系列具有不同程度的层内氢键相互作用的共价有机框架(表示为COF-960- n )多变量综合策略。尽管所得COF具有相似的化学结构、良好的结晶性和高表面积,但由于羟基与甲氧基的比例不同,整体光催化析氢发生了显着变化。COF-960-5在可见光照射下表现出最佳的电荷转移速率和最低的电子空穴复合速率,从而产生最佳的析氢速率(678 μmol g -1 h -1 )。此外,氢键相互作用有助于增强COF在光催化过程中的稳定性。这项研究表明,部分氢键可以导致更好的光催化H 2析出,为进一步设计基于COF的高效H 2光催化剂提供了见解。进化。
Intermediate Formation of Macrocycles for Efficient Crystallization of 2D Covalent Organic Frameworks with Enhanced Photocatalytic Hydrogen Evolution
作者:Kuixing Wang、Yuelin Zhong、Wenbo Dong、Yueyuan Xiao、Shijie Ren、Longyu Li
DOI:10.1002/anie.202304611
日期:2023.7.24
An efficient crystallization strategy is proposed for 2D covalentorganicframeworks (COFs) involving intermediate formation of hexagonal macrocycles. COF-935 with 3 wt % Pt exhibits a high hydrogen evolution rate of 67.55 mmol g−1 h−1 for water splitting when exposed to visible light. Even at a low loading of only 0.1 wt % Pt, COF-935 exhibits an average hydrogen evolution rate of 19.80 mmol g−1 h−1
针对涉及六方大环中间体形成的二维共价有机骨架(COF)提出了一种有效的结晶策略。当暴露于可见光时,含有 3 wt% Pt 的 COF-935 对于水分解表现出 67.55 mmol g -1 h -1的高析氢速率。即使在仅 0.1 wt% Pt 的低负载量下,COF-935 也表现出 19.80 mmol g -1 h -1的平均析氢速率。