State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute, Wuhan University of Technology, Wuhan 430070, China.
Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China.
Nano Lett. 2023 May 24;23(10):4390-4398. doi: 10.1021/acs.nanolett.3c00661. Epub 2023 May 8.
Photocatalysts for seawater splitting are severely restricted because of the presence of multiple types of ions in seawater that cause corrosion and deactivation. As a result, new materials that promote adsorption of H and hinder competing adsorption of metal cations should enhance utilization of photogenerated electrons on the catalyst surface for efficient H production. One strategy to design advanced photocatalysts involves introduction of hierarchical porous structures that enable fast mass transfer and creation of defect sites that promote selective hydrogen ion adsorption. Herein, we used a facile calcination method to fabricate the macro-mesoporous CN derivative, V-HCN, that contains multiple nitrogen vacancies. We demonstrated that V-HCN has enhanced corrosion resistance and elevated photocatalytic H production performance in seawater. Experimental results and theoretical calculations reveal that enhanced mass and carrier transfer and selective adsorption of hydrogen ions are key features of V-HCN that lead to its high seawater splitting activity.
用于海水分解的光催化剂受到严重限制，因为海水中存在多种类型的离子，这些离子会引起腐蚀和失活。因此，应该促进 H 吸附并阻碍金属阳离子竞争吸附的新材料，可以增强催化剂表面光生电子的利用，从而实现高效的 H 生产。设计先进光催化剂的一种策略涉及引入分级多孔结构，该结构可以促进快速传质并形成促进选择性氢离子吸附的缺陷位。在此，我们使用简便的煅烧方法制备了含有多种氮空位的大介孔 CN 衍生物 V-HCN。我们证明 V-HCN 具有增强的耐腐蚀性和在海水中提高的光催化 H 生产性能。实验结果和理论计算揭示了增强的质量和载流子转移以及氢离子的选择性吸附是导致 V-HCN 具有高海水分解活性的关键特征。
