High-Performance H2S Sensors to Detect SF6 Leakage

Detecting H₂S in oxygen-deficient conditions is vital for identifying leaks in SF₆-insulated electrical equipment. Current infrared-based detection methods are expensive and sensitive to environmental conditions, highlighting the necessity for cost-effective and stable gas sensors. Existing gas sensors based on semiconducting metal oxides (SMOXs) are limited by redox reactions with oxygen and require high operating temperatures. Here, we introduce a room-temperature (RT) H₂S sensor for oxygen-deficient environments using the intrinsic conducting two-dimensional (2D) metal-organic framework (MOF), Co_1.8Ni_1.2(hexaiminotriphenylene)₂ [Co_1.8Ni_1.2(HITP)₂], overcoming the limitations of SMOX gas sensors. Remarkably, Co_1.8Ni_1.2(HITP)₂ sensors exhibit exceptional selectivity for H₂S with negligible cross-responses and a sensitivity drift of less than 4.13% in an SF₆ atmosphere over 60 days. The Co_1.8Ni_1.2(HITP)₂ gas sensor shows significant promise for real-time and stable monitoring of H₂S gas in oxygen-deficient environments.