fig4

Figure 4. Hydrogen sensing performance of atomically dispersed Au and Pd co-sensitized SnO₂ and its practical application in portable detection. (A) Dynamic response-recovery profiles of Au/Pd-SnO₂ sensor toward various H₂ concentrations; (B) Dependence of response time on hydrogen concentration; (C) Selectivity of the sensor against different interfering gases (10 ppm); (D) Comparative response ratios of four sensors to H₂ versus interfering gases; (E) Proposed sensing mechanism involving atomically dispersed Au and Pd species, surface oxygen species (O*), and reactive hydrogen (H*); (F) Real-time response of the Au/Pd-SnO₂-based handheld detector to low-level H₂; (G) Performance of a commercial H₂ detector (TGS2616-C00) under identical conditions. Reproduced with permission from Ref.^[42]. Copyright 2025, American Chemical Society. EDL: Electron depletion layer.