Zhang Zijian, Chen Xianjie, Zhang Hanjie, Liu Weixu, Zhu Wei, Zhu Yongfa
Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, P. R. China.
Adv Mater. 2020 Aug;32(32):e1907746. doi: 10.1002/adma.201907746. Epub 2020 Jun 28.
A highly crystalline perylene imide polymer (Urea-PDI) photocatalyst is successfully constructed. The Urea-PDI presents a wide spectrum response owing to its large conjugated system. The Urea-PDI performs so far highest oxygen evolution rate (3223.9 µmol g h ) without cocatalysts under visible light. The performance is over 107.5 times higher than that of the conventional PDI supramolecular photocatalysts. The strong oxidizing ability comes from the deep valence band (+1.52 eV) which is contributed by the covalent-bonded conjugated molecules. Besides, the high crystallinity and the large molecular dipoles of the Urea-PDI contribute to a robust built-in electric field promoting the separation and transportation of photogenerated carriers. Moreover, the Urea-PDI is very stable and has no performance attenuation after 100 h continuous irradiation. The Urea-PDI polymer photocatalyst provides with a new platform for the use of photocatalytic water oxidation, which is expected to contribute to clean energy production.
成功构建了一种高度结晶的苝酰亚胺聚合物（尿素 - PDI）光催化剂。由于其大的共轭体系，尿素 - PDI呈现出宽光谱响应。在可见光下，尿素 - PDI在没有助催化剂的情况下表现出迄今为止最高的析氧速率（3223.9 μmol g⁻¹ h⁻¹）。该性能比传统的PDI超分子光催化剂高出107.5倍以上。强氧化能力来自于由共价键合的共轭分子贡献的深价带（+1.52 eV）。此外，尿素 - PDI的高结晶度和大分子偶极矩有助于形成强大的内建电场，促进光生载流子的分离和传输。此外，尿素 - PDI非常稳定，连续照射100小时后没有性能衰减。尿素 - PDI聚合物光催化剂为光催化水氧化的应用提供了一个新平台，有望为清洁能源生产做出贡献。
