Rapid and Selective Detection of Trace Hydrogen by Mesoporous SnO<sub>2</sub> Anchored with Au-Pd Dual-Atom Sensitizers.
basic_science · Level V
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- Record sourced from PubMed, PMID 40327744.
- Also identified by DOI 10.1021/acs.nanolett.5c01309.
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Abstract
Due to weak interactions between hydrogen molecules and sensing materials as well as slow H<sub>2</sub> oxidation kinetics, traditional semiconductor metal oxides (SMOs) have limited capability for selective and rapid hydrogen sensing. We propose an innovative strategy to enhance gas-sensing performance by modifying SMOs with atomically dispersed dual noble-metal sensitizers, differing from conventional single-atom or nanoparticle sensitizers. This sensor shows fast response time (1 s), strong resistance to CO, NO, H<sub>2</sub>S, and SO<sub>2</sub> interference, and an ultralow detection limit (70 ppb) toward hydrogen, surpassing single noble-metal modified hydrogen sensors. The excellent sensing performance can be attributed to the synergistic sensitization of atomically dispersed Au/Pd dual catalysts with complementary gas activation properties. The hand-held hydrogen detector, featuring a fast response (<1 s), demonstrates robust early warning capability for H<sub>2</sub> leakage. This work introduces an atomically dispersed dual noble-metal sensitization strategy for superior hydrogen sensing, paving the way for hydrogen safety.