Scholarlink

<p>Covalent organic frameworks with tunable optical bandgaps and notable piezoelectricity enable sustainable piezo-photocatalytic production of H<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> via pure water splitting. Strong dipole moments can significantly boost piezoelectric properties, necessitating a systematic exploration of their structure-property relationships. Here, we synthesize a series of β-ketoenamine/imine-linked covalent organic frameworks, such as TP-BT-0F/1F/2F-COF, BTA-BT-0F-COF, and TP-SB-COF, through molecular design engineering. The combination of symmetry-breaking benzothiadiazole units and in-plane polarized β-ketoenamine linkages creates a robust dipole moment in TP-BT-0F-COF. This material demonstrates a high piezoelectric coefficient and bandgap narrowing, achieving H<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> production rates of 1501.4 and 1435.8 μmol g<sup>−1</sup> h<sup>−1</sup> under co-exposure to ultrasound (60 W, 40 kHz) and visible light. Density functional theory identifies N<sup>8</sup> and C<sup>6</sup> sites on benzothiadiazole units as potential catalytic sites for H<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> evolution, respectively. Molecular design of covalent organic frameworks with prominent dipole moments advances mechano-optical energy conversion technologies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhanced piezo-photocatalytic water splitting activity via engineering robust dipole moments in covalent organic frameworks

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月12日

查看全文
  • Zi-Zhan Liang,
  • Yixuan Wang,
  • Xin-Ao Li,
  • Xin-Bang Peng,
  • Li Gong,
  • Li-Min Xiao,
  • Xinyi Yang,
  • Bo Zou,
  • Yecheng Zhou,
  • Jun-Min Liu

摘要

Covalent organic frameworks with tunable optical bandgaps and notable piezoelectricity enable sustainable piezo-photocatalytic production of H2 and H2O2 via pure water splitting. Strong dipole moments can significantly boost piezoelectric properties, necessitating a systematic exploration of their structure-property relationships. Here, we synthesize a series of β-ketoenamine/imine-linked covalent organic frameworks, such as TP-BT-0F/1F/2F-COF, BTA-BT-0F-COF, and TP-SB-COF, through molecular design engineering. The combination of symmetry-breaking benzothiadiazole units and in-plane polarized β-ketoenamine linkages creates a robust dipole moment in TP-BT-0F-COF. This material demonstrates a high piezoelectric coefficient and bandgap narrowing, achieving H2 and H2O2 production rates of 1501.4 and 1435.8 μmol g−1 h−1 under co-exposure to ultrasound (60 W, 40 kHz) and visible light. Density functional theory identifies N8 and C6 sites on benzothiadiazole units as potential catalytic sites for H2 and H2O2 evolution, respectively. Molecular design of covalent organic frameworks with prominent dipole moments advances mechano-optical energy conversion technologies.