Fig. 4
From: A sodium-ion sulfide solid electrolyte with unprecedented conductivity at room temperature

Monitoring H2S gas generated from Na2.88Sb0.88W0.12S4 as a function of exposure time to humid air (relative humidity (R.H.) = 70%). The H2S content is normalized by the weight of sulfur in the samples. For comparison, the same measurement was carried out for Na3PS4 under a less-humid condition of R.H. = 50%