Abstract
The generation of solar H2O2 through the reaction of O2 and H2O is a cost-effective and environmental-friendly procedure. Nevertheless, most photocatalysts are only active when sacrificial donors are present, thereby limiting their practicality. Herein, the S-scheme fiber heterojunction Nb2O5@NiS (NONS) was fabricated as a catalyst for photocatalytic hydrogen peroxide evolution through an electro-spinning-assisted ion exchange strategy. In situ X-ray photoelectron spectroscopy analysis was then used to investigate the excellent performance (0.48 mmol g−1) of the optimized photocatalyst NONS-30 obtained directly from pure water and air through the S-scheme charge transfer path. Following scavenger capture experiments and electron spin resonance spectroscopy, an overlooked pathway was discovered that implicated 1O2 in the formation of H2O2. This work also revealed an alternative reaction pathway to produce H2O2 by fabricating fiber heterojunction photocatalysts.
摘要
太阳能驱动在纯水中生成过氧化氢(H2O2)被认为是一种具有成 本效益且环保的方法. 然而, 大多数光催化剂只有在存在牺牲供体的情 况下才会表现出性能, 从而限制了其实用性. 本文通过静电纺丝辅助离 子交换策略, 制备出了S型纤维异质结Nb2O5@NiS (NONS), 作为光催化 产过氧化氢的催化剂. 通过原位X射线光电子能谱分析研究了S型电荷 转移路径. 通过捕获实验和电子自旋共振光谱, 证实了单线态氧(1O2) 与H2O2的形成有关. 这项工作还揭示了通过制造纤维异质结光催化剂 产生H2O2的另一种反应途径.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52104254 and 22378104), the Natural Science Foundation of Hubei Province (2022CFB504) and the Open Subject of Engineering Research Center for Clean Production of Textile Printing and Dyeing, Ministry of Education (2023GCZX008).
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Author contributions Li K and Wang K designed and engineered the samples; Li K, Mei J, Liu Y, Hu D, and Yan S performed the experiments; Li K wrote the paper with support from Wang K and Wang G. All authors contributed to the general discussion.
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Supplementary information Supporting data are available in the online version of the paper.
Ke Li is currently an MSc candidate in physical chemistry under the supervision of Associate Prof. Kai Wang and Prof. Guohong Wang at Hubei Normal University. Her research focuses on novel photocatalytic materials.
Guohong Wang received his PhD degree from Wuhan University of Technology. He then returned to Hubei Normal University and was promoted to be a full professor in 2013. His current research directions mainly focus on photocatalytic materials for energy conversion.
Kai Wang received his PhD degree in 2020 from Wuhan University of Technology. In 2021, he became an Associate Professor at Hubei Normal University. He was a postdoctoral fellow at Nanyang Technological University (NTU) from 2022 to 2024. His interests focus on nanomaterials for solar energy conversion and photocatalysis.
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Supplementary Information: Boosting photosynthesis of hydrogen peroxide directly from pure water and air over S-scheme fiber heterojunction
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Li, K., Mei, J., Li, J. et al. Boosting the photosynthesis of hydrogen peroxide directly from pure water and air over S-scheme fiber heterojunction. Sci. China Mater. 67, 484–492 (2024). https://doi.org/10.1007/s40843-023-2717-0
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DOI: https://doi.org/10.1007/s40843-023-2717-0