Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202112379
Keywords
hydrogen indicators; hydrogen sensors; in situ DRIFTS measurements; MD simulations; smart additives; supraparticles
Categories
Funding
- BMBF (NanoMatFutur grant) [03XP0149]
- German Federal Environmental Foundation (DBU)
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [431791331 - SFB 1452]
- DFG [EXC 315]
- Projekt DEAL
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The researchers have developed micron-scaled indicator supraparticles for real-time monitoring and irreversible recording of H-2 gas. These supraparticles have fast response times, can be easily detected with the naked eye, and allow for simultaneous monitoring of H-2 exposure, making them an attractive safety additive for leakage detection and localization in a H-2 economy.
Indicators for H-2 are crucial to ensure safety standards in a green hydrogen economy. Herein, the authors report micron-scaled indicator supraparticles for real-time monitoring and irreversible recording of H-2 gas via a rapid eye-readable two-step color change. They are produced via spray-drying SiO2 nanoparticles, Au-Pd nanoparticles, and indicator-dye resazurin. The resulting gas-accessible mesoporous supraparticle framework absorbs water from humid atmospheres to create a three-phase-system. In the presence of H-2, the color of the supraparticle switches first irreversibly from purple to pink and further reversibly to a colorless state. In situ infrared spectroscopy measurements indicate that this color change originates from the (ir)reversible H-2-induced reduction of resazurin to resorufin and hydroresorufin. Further infrared spectroscopic measurements and molecular dynamics simulations elucidate that key to achieve this functionality is an established three-phase-system within the supraparticles, granting molecular mobility of resazurin. Water acts as transport medium to carry resazurin molecules towards the catalytically active Au-Pd nanoparticles. The advantages of the supraparticles are their small dimensions, affordable and scalable production, fast response times, straightforward bare-eye detection, and the possibility of simultaneously monitoring H-2 exposure in real-time and ex post. Therefore, H-2 indicator supraparticles are an attractive safety additive for leakage detection and localization in a H-2 economy.
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