Lin Xiaoyu, Liang Yuanying, Hu Zhicheng, Zhang Xi, Liang Youcai, Hu Zhengwei, Huang Fei, Cao Yong
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2022 May 2;12(9):1535. doi: 10.3390/nano12091535.
We prepared a series of one-dimensional conjugated-material-based nanofibers with different morphologies and donor/acceptor (D/A) compositions by electrospinning for efficient photocatalytic hydrogen evolution. It was found that homogeneous D/A heterojunction nanofibers can be obtained by electrospinning, and the donor/acceptor ratio can be easily controlled. Compared with the single-component-based nanofibers, the D/A-based nanofibers showed a 34-fold increase in photocatalytic efficiency, attributed to the enhanced exciton dissociation in the nanofibrillar body. In addition, the photocatalytic activity of these nanofibers can be easily optimized by modulating the diameter. The results show that the diameter of the nanofibers can be conveniently controlled by the electrospinning feed rate, and the photocatalytic effect increases with decreasing fiber diameter. Consequently, the nanofibers with the smallest diameter exhibit the most efficient photocatalytic hydrogen evolution, with the highest release rate of 24.38 mmol/(gh). This work provides preliminary evidence of the advantages of the electrospinning strategy in the construction of D/A nanofibers with controlled morphology and donor/acceptor composition, enabling efficient hydrogen evolution.
我们通过静电纺丝制备了一系列具有不同形态和供体/受体（D/A）组成的一维共轭材料基纳米纤维，用于高效光催化析氢。研究发现，通过静电纺丝可以获得均匀的D/A异质结纳米纤维，并且供体/受体比例可以很容易地控制。与单组分基纳米纤维相比，基于D/A的纳米纤维的光催化效率提高了34倍，这归因于纳米纤维体内激子解离的增强。此外，通过调节直径可以很容易地优化这些纳米纤维的光催化活性。结果表明，纳米纤维的直径可以通过静电纺丝进料速率方便地控制，并且光催化效果随着纤维直径的减小而增加。因此，直径最小的纳米纤维表现出最有效的光催化析氢，最高释放速率为24.38 mmol/(gh)。这项工作为静电纺丝策略在构建具有可控形态和供体/受体组成的D/A纳米纤维以实现高效析氢方面的优势提供了初步证据。
