“…18 The reduction of free-carbon from SiOC has been conducted using (poly)siloxane precursors with less-carbon or carbon-free groups (Si-CH 3 , Si-H or Si-Si), 9,10,13,14,20 introducing active metal fillers or compounds (such as Ti, Al and MoSi) into polysiloxanes to react with the carbon precipitated in the precursor during pyrolysis, 21,22 and using active gases (such as ammonia) during pyrolysis of polysiloxanes or through postannealing of SiOC ceramics. 9,15 These processes show some effects on the adjusting of the amount of carbon in SiOC, but the effect appears limited since the obtained SiOC ceramics are exclusively black. 9,18 In this work, we report a highly efficient and simple way to reduce carbon from SiOC, that is, to pyrolyze a polysiloxane in water vapor.…”