Novel Low‐Temperature Operating Catalytic Combustion‐Type Methane Gas Sensor Based on Gadolinium Silicate‐Supported Palladium Oxide

In this study, a novel catalytic combustion‐type methane gas sensor was developed using an 11.3 wt.% PdO/20 wt.% Gd 10 Si 6 O 27 /γ‐Al 2 O 3 (PdO/GdSiO/AlO) catalyst. The incorporation of GdSiO as a promoter efficiently supplied active oxygen species to the PdO, thereby enabling methane combustion at low temperatures. The sensor employing the PdO/GdSiO/AlO catalyst exhibited a quantitative response to methane at temperatures as low as 320 °C, with a 50% response time of approximately 13 s. © 2025 The Author(s). IEEJ Transactions on Electrical and Electronic Engineering published by Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.