Carbazole-Based Donor-Acceptor Conjugated Microporous Polymers for Efficient Visible-Light-Driven Photocatalytic H_(2) Evolution  

作　　者：Linchu Xu Chen Yang Zhonghua Cheng Qihang Huang Shizhe Zhang Cheng Qian Yaozu Liao 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai,201620 China

出　　处：《Chinese Journal of Chemistry》2023年第19期2518-2524,共7页中国化学（英文版）

基　　金：support from the National Natu-ral Science Foundation of China(52073046,52203006);the Na-tional Key Research and Development Program of China(2022YFB3807100,2022YFB3807102,2022YFB3807103);the Pro-gram of Shanghai Academic Research Leader(21XD1420200);the Chang Jiang Scholar Program(Q2019152);the Natural Science Foundation of Shanghai(23ZR1401100);the Shanghai Pujiang Program(21PJ1400300);the Fundamental Research Funds for the Central Universities(2232022D-06).

摘　　要：Conjugated microporous polymers (CMPs) featuring extended π-structures, large specific surface area and tailor-made functionalities are a class of promising organic photocatalysts for hydrogen evolution reaction (HER) from water. However, the photocatalytic activities of most CMPs are severely hindered by slow charge transfer rate and fast charge recombination process. Herein, we develop a strategy for the synthesis of donor-acceptor CMPs through nickel(0)-catalyzed Yamamoto cross-coupling of 3,6-dibromo-9-(4-bromophenyl)carbazole (CZ) with 5,5'-dibromo-2,2'-bipyridine (DBPy) for efficient HER from water. The PCZN-4 prepared with a 2 : 3 stoichiometric ratio of CZ to DBPy exhibited the highest photocatalytic hydrogen evolution rate of 7160 μmol·g^(–1)·h^(–1), which was nearly equal to 179 times and 143 times that of PCZN-1 (40 μmol·g^(–1)·h^(–1)) and PCZN-6 (50 μmol·g^(–1)·h^(–1)) obtained by Yamamoto homocoupling of CZ and DBPy, respectively. Compared to the homocoupling counterparts, the enhanced photocatalytic activity of PCZN-4 results from improved separation efficiency of charge carriers. Interestingly, the photocatalytic H2 evolution performance of PCZN-4 could be further improved up to 17080 μmol·g^(–1)·h^(–1) by adjusting pH of the aqueous solution. This work offers a novel approach for improving photocatalytic efficiency by tuning the chemical structures and surrounding microenvironment of the polymer backbone.

关 键 词：CARBAZOLE BIPYRIDINE DONOR-ACCEPTOR MICROENVIRONMENT Conjugated polymers Photocatalytic hydrogen evolution 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]