Li Yin , Tengbiao Yu , Wenpei Shi , Kang Zhao , Jinrui Liu , Qi Qin , Bin Zhao , Bingbing Fan , Deliang Chen , Rui Zhang
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引用次数: 0
Abstract
Hydrogen(H2), a clean and sustainable energy carrier of high energy density, is key to the low-carbon energy transition. Due to its colorless, odorless and highly flammable properties, safe and efficient H2 leakage detection is imperative to prevent explosions. Porous α-Fe2O3 nanosheets (NSs) were synthesized via microwave-assisted co-precipitation followed by sintering, using graphene oxide as the template. The resulting α-Fe2O3 NSs exhibited a hierarchical structure assembled from sub-level α-Fe2O3 nanoparticles at 12–43 nm with a mean diameter of 26 nm. Numerous oxygen vacancy defects were formed on the particle surfaces, endowing the α-Fe2O3 NSs with outstanding H2-sensing performance. At 150 °C, the α-Fe2O3 sensor showed ultrahigh sensitivity toward H2, with response values of 63.7 and 17.9 for 50 ppm and 10 ppm H2, respectively. Furthermore, the porous α-Fe2O3 sensor presented excellent selectivity, maintaining responses below 3 for other tested gases at 100 ppm. Compared with other α-Fe2O3-based sensors, the porous α-Fe2O3 NSs sensor demonstrates enhanced sensitivity, a lower detection limit, and a reduced optimal working temperature. The ultra-sensitive H2-sensing property of the α-Fe2O3 NSs is attributed to the porous architecture, fine-grained substructures and massive oxygen vacancies. These findings highlight the potential of porous α-Fe2O3 NSs for high-performance hydrogen detection applications.
期刊介绍:
The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc.
The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.