Colorimetric Sensor Based on Pd–MoO3 Nanowires for Hydrogen Gas Leak Detection
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The early detection of hydrogen gas leaks is crucial because of their high explosion risk. Current oxide–semiconductor-based hydrogen sensors are reliant on electrical circuits that may fail during accidents and require high temperatures, thereby raising safety concerns. Thus, there is an urgent need for the development of simpler and more intuitive sensors that can operate at room temperature. This study proposed a hydrogen sensor based on Pd–MoO3 nanowires. The sensor exhibited a visible color change upon exposure to hydrogen at room temperature. The Pd–MoO3 nanowires were synthesized by decorating the surface of hydrothermally produced MoO3 nanowires with 1–5 wt.% Pd. Upon exposure to 5% hydrogen gas at room temperature, all Pd–MoO3 nanowires exhibited distinct color changes (∆E). In particular, the MoO3 nanowires with 3 wt.% Pd (3Pd–MoO3) yielded an exceptionally high ∆E value of over 15 within 10 min. Further, the 3Pd–MoO3 nanowires exhibited a noticeable color change (∆E > 1.6) within 2 min, demonstrating their potential for highly sensitive and rapid hydrogen detection. The out standing color change of the 3Pd–MoO3 nanowires was attributed to valence changes in both Mo (Mo6+ and Mo5+) and Pd (Pd2+ and Pd0) upon exposure to hydrogen.
Abstract
The early detection of hydrogen gas leaks is crucial because of their high explosion risk. Current oxide–semiconductor-based hydrogen sensors are reliant on electrical circuits that may fail during accidents and require high temperatures, thereby raising safety concerns. Thus, there is an urgent need for the development of simpler and more intuitive sensors that can operate at room temperature. This study proposed a hydrogen sensor based on Pd–MoO3 nanowires. The sensor exhibited a visible color change upon exposure to hydrogen at room temperature. The Pd–MoO3 nanowires were synthesized by decorating the surface of hydrothermally produced MoO3 nanowires with 1–5 wt.% Pd. Upon exposure to 5% hydrogen gas at room temperature, all Pd–MoO3 nanowires exhibited distinct color changes (∆E). In particular, the MoO3 nanowires with 3 wt.% Pd (3Pd–MoO3) yielded an exceptionally high ∆E value of over 15 within 10 min. Further, the 3Pd–MoO3 nanowires exhibited a noticeable color change (∆E > 1.6) within 2 min, demonstrating their potential for highly sensitive and rapid hydrogen detection. The out standing color change of the 3Pd–MoO3 nanowires was attributed to valence changes in both Mo (Mo6+ and Mo5+) and Pd (Pd2+ and Pd0) upon exposure to hydrogen.
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