Shen Peng, Li Nan, Nasser ALabdulsalam Mohammed, Zhu Bin, Xi Xi, She Lijia, Liu Yafei, Ma Jiangquan
Jiangsu Province Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu Province 213164, China.
Refining and Petrochemical Technologies Institute (RPTI), Energy and industry sector (EIS), King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia.
Langmuir. 2024 Sep 12. doi: 10.1021/acs.langmuir.4c02578.
Photocatalytic hydrogen production with low environmental and economic costs is expected to be a powerful means to alleviate energy and environmental problems. However, how to inhibit the rapid recombination of photogenerated carriers is a challenge that photocatalytic hydrogen production has to face. In this study, the coupling of the piezoelectric effect and vacancy engineering into the photocatalytic reaction process synergistically promoted carrier separation, thereby promoting the improvement of hydrogen production performance. Specifically, the novel dual piezoelectric BiS/BiNaTiO (BS-12/BNT) piezo-photocatalyst rich in S vacancies was synthesized by an impregnation method. The hydrogen generation rate of 5% BS-12/BNT under the combined impact of light and ultrasound was up to 1019.39 μmol/g/h, which is 9.5 times higher than that of pure BNT. Various characterization analyses have confirmed that the piezoelectric-photocatalytic activity of BS/BNT composite materials is significantly improved, mainly due to the introduction of S vacancies and piezoelectric fields, which enhance the absorption of sunlight, reduce interface resistance, and so raise the photogenerated carriers' separation efficiency. In addition, the stability of BS/BNT is significantly better than that of the previously synthesized catalysts. Finally, according to the results of XPS, UV-vis, and ESR, the active groups and possible electron transfer paths generated during the piezoelectric-photocatalytic hydrogen production process were studied. This work presents a new approach to promote hydrogen production performance through the synergistic effect of the piezoelectric effect and S vacancies.
具有低环境和经济成本的光催化产氢有望成为缓解能源和环境问题的有力手段。然而，如何抑制光生载流子的快速复合是光催化产氢必须面对的挑战。在本研究中，将压电效应和空位工程耦合到光催化反应过程中，协同促进了载流子分离，从而促进了产氢性能的提高。具体而言，通过浸渍法合成了富含S空位的新型双压电BiS/BiNaTiO（BS-12/BNT）压电光催化剂。5% BS-12/BNT在光和超声的联合作用下产氢速率高达1019.39 μmol/g/h，是纯BNT的9.5倍。各种表征分析证实，BS/BNT复合材料的压电光催化活性显著提高，主要是由于引入了S空位和压电场，增强了对太阳光的吸收，降低了界面电阻，从而提高了光生载流子的分离效率。此外，BS/BNT的稳定性明显优于先前合成的催化剂。最后，根据XPS、UV-vis和ESR的结果，研究了压电光催化产氢过程中产生的活性基团和可能的电子转移路径。这项工作提出了一种通过压电效应和S空位的协同作用来提高产氢性能的新方法。
