Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 12, Pages 19728-19736Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.03.090
Keywords
H 2 sensor; Ag catalyst activity; Molecular sieve strategy
Categories
Ask authors/readers for more resources
In this study, ZnO@ZIF-71@Ag nanorod arrays were synthesized to provide effective adsorption response to H2. The nanorod arrays showed increased selectivity towards H2, and the response to 50 ppm H2 was significantly higher compared to ZnO@ZIF-71 alone. The presence of Ag nanoparticles in the pores of ZIF-71 contributed to the catalytic effect, breaking H2 molecules into highly active atoms.
Hydrogen (H2) is widely used in industrial and medical, however its flammable and explosive nature requires economical and effective monitoring to ensure safety. In this work, ZnO@ZIF-71@Ag nanorod arrays were synthesized to provide an effective adsorption response to H2 through size effect and high catalytic activity by immobilizing Ag nanoparticles (NPs) into the pores of ZIF-71. The results of the gas sensitivity tests showed that the nanorod arrays were significantly more selective towards H2. Moreover, the response of ZnO@ZIF-71@Ag to 50 ppm H2 was 11 times higher than that of ZnO@ZIF-71 at a lower operating temperature (150 degrees C). The size of the Ag NPs was demonstrated to be below 10 nm by TEM characterization, suggesting that Ag in the form of quantum dots (QDs) to bring an unignorable catalytic effect for breaking hydrogen molecule (H2) into highly active atoms ([H]). In addition, the result of Density Function Theory (DFT) calculation revealed that the adsorption energy of Ag-catalyzed [H] (-8.255 eV) was much higher than that of H2 (-4.222 eV) on ZnO (100), which results in elevated charge transfer to promote hydrogen sensing performance of ZnO@ZIF-71@Ag. In this study, a novel hydrogen sensor based on pore sieving and catalytic sensing mechanisms was obtained, which provides a new reference for the development of hydrogen sensors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available