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苯并二氮咪唑低聚物实现高效光催化析氢和析氧
作者:小柯机器人 发布时间:2022/10/1 9:47:14

清华大学朱永法团队报道了侧基工程具有强电场和短程结晶性的苯并二氮咪唑低聚物实现高效光催化析氢和析氧。相关研究成果于2022年9月20日发表在《德国应用化学》。

电荷分离不足和激子传输迟缓严重限制了聚合物光催化剂的应用。

为了解决上述问题,研究人员在新型苯并二咪唑低聚物中加入大量羧基取代基,并将其组装成晶体半导体。这种光催化剂是极性的、亲水的、短程结晶的,能够放出氢和氧。羧基侧基的引入增加了局部结构的不对称性,并增加了内置电场。此外,通过短范围结晶度实现加速载流子转移。在双功能聚合物光催化剂中,产氢和产氧速率分别达到18.63和2.87 mmol g-1 h-1,是有报道过的最佳性能之一。

该工作开创了高性能低聚物光催化剂的研究,开辟了太阳能燃料生产的新领域。

附:英文原文

Title: Efficient Photocatalytic Hydrogen and Oxygen Evolution by Side-Group Engineered Benzodiimidazole Oligomers with Strong Built-in Electric Fields and Short-Range Crystallinity

Author: Jingyi Xu, Wenlu Li, Weixu Liu, Jianfang Jing, Kunfeng Zhang, Jun Yang, Enwei Zhu, Junshan Li, Yongfa Zhu

Issue&Volume: 2022-09-20

Abstract: The insufficient charge separation and sluggish exciton transport severely limit the utilization of polymeric photocatalysts. To resolve the above issues, we incorporate bountiful carboxyl substituents within a novel benzodiimidazole oligomer and assemble it into a crystalline semiconductor. The photocatalyst is polar, hydrophilic, short-range crystalline, and capable of both hydrogen and oxygen evolution. The introduction of carboxyl side-groups adds asymmetry to the local structure and increases the built-in electric field. Further, accelerated carrier transfer is enabled via the short-range crystallinity. The superior hydrogen and oxygen production rates of 18.63 and 2.87 mmol g1  h1  represent one of the best performances ever reported among dual-functional polymeric photocatalysts. Our work initiates studies on high-performance oligomer photocatalysts, opening a new frontier to produce solar fuel.

DOI: 10.1002/anie.202212243

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202212243

期刊信息

Angewandte Chemie:《德国应用化学》,创刊于1887年。隶属于德国化学会,最新IF:12.959
官方网址:https://onlinelibrary.wiley.com/journal/15213773
投稿链接:https://www.editorialmanager.com/anie/default.aspx