High-Performance\nH<sub>2</sub>S Sensors to Detect\nSF<sub>6</sub> Leakage

Detecting H<sub>2</sub>S in oxygen-deficient conditions\nis vital\nfor identifying leaks in SF<sub>6</sub>-insulated electrical equipment.\nCurrent infrared-based detection methods are expensive and sensitive\nto environmental conditions, highlighting the necessity for cost-effective\nand stable gas sensors. Existing gas sensors based on semiconducting\nmetal oxides (SMOXs) are limited by redox reactions with oxygen and\nrequire high operating temperatures. Here, we introduce a room-temperature\n(RT) H<sub>2</sub>S sensor for oxygen-deficient environments using\nthe intrinsic conducting two-dimensional (2D) metal–organic\nframework (MOF), Co<sub>1.8</sub>Ni<sub>1.2</sub>(hexaiminotriphenylene)<sub>2</sub> [Co<sub>1.8</sub>Ni<sub>1.2</sub>(HITP)<sub>2</sub>], overcoming\nthe limitations of SMOX gas sensors. Remarkably, Co<sub>1.8</sub>Ni<sub>1.2</sub>(HITP)<sub>2</sub> sensors exhibit exceptional selectivity\nfor H<sub>2</sub>S with negligible cross-responses and a sensitivity\ndrift of less than 4.13% in an SF<sub>6</sub> atmosphere over 60 days.\nThe Co<sub>1.8</sub>Ni<sub>1.2</sub>(HITP)<sub>2</sub> gas sensor\nshows significant promise for real-time and stable monitoring of H<sub>2</sub>S gas in oxygen-deficient environments.