*2.3. Further Refinement and Modification*

2.3.1. IF-WS2 Synthesis Using a Continuous Feeding System—Experiments Based on Both New Feeding System and Baffled Tubes are Named FB*<sup>n</sup>*

The XRD patterns of samples collected from Sample FB1 (Figure S10) demonstrate a completely conversion of WO*x* into WS2. No WO*x* peaks for the hot zone samples and extremely minor peaks of WO*x* for the outlet zone samples.

**Figure S10.** XRD profiles of samples collected from different reaction zones in experiment FB1.

The SEM images in Figure S11 have revealed the morphology of particles collected from the hot zone in FB1. The particles were quite uniform, with sizes no more than 100 nm. The very bright pieces at the right bottom corner of Figure S11b could be residue S, owing to the excessive amount of H2S gas used.

**Figure S11.** SEM images for particles collected from hot zone of experiment FB1.
