Noble-metal-free MnS/In2S3 composite as highly efficient visible light driven photocatalyst for H2 production from H2S

Energy‐Band‐Controlling Strategy to Construct Novel CdxIn1‐xS Solid Solution for Durable Visible Light Photocatalytic Hydrogen Sulfide Splitting

“…In previous work, the phototstability can be inhibited by the sulfur deposition on the catalysts surface in the reaction process . Because the fast H 2 S splitting rate leads to the sulfur or polysulfide cannot be transferred from catalyst surface to bulk solution on time, resulting in the occupation of active sites and the reduction of sunlight harvesting ability . Therefore, this result also confirms the formation of Cd x In 1‐x S solid solutions can hinder the deposition of S on catalytic surface.…”

“…Therefore, the long‐term stability of CI75 solid solution was also tested, as shown in Figure d. The photocatalytic H 2 production rate over CI75 remained relatively constant for least 15 h. The activity slightly decreased when the irradiation time exceeds 10 h. This phenomenon could be ascribed to the consumption of Na 2 SO 3 . All in all, the CI75 solid solution exhibits an outstanding photostability as compared to other reported catalysts (cf.…”

“…Another important factor which influences the efficiency of H 2 S splitting is the S deposition on the catalyst surface. It has been confirmed to be unfavorable for photocatalytic reactions in many previous studies . Because the S can be adsorbed on the catalyst surface to occupy the active sites and shield the light absorption.…”

“…Interestingly, the phenomenon of sulfur deposition on the catalyst surface is not observed. In previous work, the phototstability can be inhibited by the sulfur deposition on the catalysts surface in the reaction process . Because the fast H 2 S splitting rate leads to the sulfur or polysulfide cannot be transferred from catalyst surface to bulk solution on time, resulting in the occupation of active sites and the reduction of sunlight harvesting ability .…”

Green Transforming Metallurgical Residue into Alkali-Activated Silicomanganese Slag-Based Cementitious Material as Photocatalyst

“…When the 4.5EASSC sample is irradiated by UV light, the electron in the valence band of α-MnS semiconductor absorbs the energy of photon which is bigger than band gap energy of 2.53 eV, and the electron jumps from the valence band to conduction band to generate both photo-induced electron (e − ) and hole (h + ). The positions of conduction and valence bands of α-MnS are located at −1.34 V and 1.19 V vs. NHE [20]. It is more negative than the potential of O 2 /•O 2 − (−0.33 V), which indicated that the photo-excited electrons on the conduction band could reduce the adsorbed oxygen molecules to produce superoxide radical (•O 2 − ).…”