Samanta Soumadri, Kumar Sunil, Battula V R, Jaryal Arpna, Sardana Neha, Kailasam Kamalakannan
Advanced Functional Nanomaterials, Energy and Environment Unit, Institute of Nano Science and Technology (INST) Phase X, SAS Nagar Mohali 160062 Punjab India
RSC Adv. 2020 Aug 11;10(50):29633-29641. doi: 10.1039/d0ra03773g. eCollection 2020 Aug 10.
Metal-free organic polymer photocatalysts have attracted dramatic attention in the field of visible light-induced hydrogen evolution reaction (HER). Herein, we showed a polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to generate hydrogen upon quantum dot sensitization. Both of these heptazine-based systems show effective photosensitization with strong π-π interactions and enhanced photocatalytic H generation (24 times) as metal-free systems. Electrochemical impedance and optical measurements show effective charge transfer kinetics with decreased charge recombination, which is responsible for the enhanced photocatalytic activity. As a result, a significant high apparent quantum yield (AQY) with highest value of 10.2% was obtained for our photocatalyst OLHP/S,N-GQD10.
无金属有机聚合物光催化剂在可见光诱导析氢反应（HER）领域引起了极大关注。在此，我们展示了一种用硫、氮共掺杂石墨烯量子点（S，N-GQDs）修饰的聚合O-连接七嗪聚合物（OLHP）作为光敏剂，通过量子点敏化来产氢。这两种基于七嗪的体系作为无金属体系，均通过强π-π相互作用表现出有效的光敏化，并增强了光催化产氢能力（提高了24倍）。电化学阻抗和光学测量表明电荷转移动力学有效，电荷复合减少，这是光催化活性增强的原因。结果，我们的光催化剂OLHP/S，N-GQD10获得了显著的高表观量子产率（AQY），最高值为10.2%。
