Initiating highly efficient (Bi,Ce)₂(O,S)_3−xoxysulfide catalysts with rich oxygen vacancies for hydrogen evolutionviaadjusting valence band configuration

Abstract

The role of oxygen vacancies (Vo) in determining semiconductors' photocatalytic hydrogen evolution reaction (PHER) activities remains a significant challenge. BiCeOS with different abundant Vo and n(Ce3+/Ce4+) amounts prepared by adjusting...

Oxygen-doped Sn17Sb6S29 bimetal oxysulfide catalysts for efficient reduction of organic pollutants and hexavalent chromium in the dark

“…1c, the peaks positioned at 529.21 eV and 538.7 eV belong to Sb2d3/2 and Sb2d5/2 of Sb( iii ), respectively, 36 whereas the peaks at 530.2 eV and 531.2 eV are attributed to lattice oxygen and hydroxyl oxygen. 37–39 As observed from Fig. 1d, the S2p peaks at 162.2 eV and 161.3 eV correspond to S2p 1/2 and S2p 3/2 of the S 2− state, respectively.…”

Sulfur Substitution and Defect Engineering in an Unfavored MnMoO4 Catalyst for Efficient Hydrogen Evolution under Visible Light

“…Compared with MnMoO 4 , MnMoOS has a unique performance to produce hydrogen efficiently. The surface distortion and V O lead to localized electrons on the exposed surface and promote surface reduction reactions. , V O can lower the energy barrier of water decomposition. The generation of intermediate defect levels reduces the energy potential required to excite photogenerated charge carriers.…”

Material design for converting an oxidative-type BiVO4 catalyst into a reductive BiV(S,O)4−x sulfo-oxide catalyst for nitrogen photoreduction to ammonia

“…89 The Vo defects also act as an electron capture center and an N 2 adsorption site for trapping N 2 and H 2 O molecules via the electron transfer from the catalyst to elongate the bond length, facilitating the N^N bond weakening. [24][25][26][27][28]90,91 The kinetic mechanism for photocatalytic N 2 xation over BiVOS involves ve steps: 91,92 (I) the BiVOS catalyst is excited to generate electrons in the CB under visible light irradiation. (II) The active Vo traps H 2 O molecules and weakens the O-H bonds of absorbed H 2 O for producing protons.…”

“…86,93 At the same time, the Vo serves as an active site for N 2 adsorption and activation. 94,95 (III) The defective BiVOS structural linkage with Vo and V 4+ assists electron hopping transport between V 4+ 4 V 5+ sites to prolong the electron lifetime, 26,27,96,97 activate adsorbed H 2 O molecules and N 2 molecules, and facilitate the electron ux for N 2 xation. 98 (IV) The adsorbed N 2 molecules on the surface of BiVOS simultaneously accept photo-excited electrons and protons to generate NH 3 , followed by NH 3 release and Vo formation.…”

“…25 A nanorod bimetal-chalcogen BiCeOS oxysulfide catalyst with higher n (Ce 3+ /Ce 4+ ) and abundant Vo defects was prepared by adjusting the hydrazine amount and exhibited excellent visible light PHER activity. 26 Abdeta et al designed a non-stoichiometric and defect-attired Bi 2 Mo 3 (S,O) 12 sulfo-oxide photocatalyst for enhancing the PHER and pollutant reduction. 27 Wu et al created a Z-scheme Mo(S,O)/Co(O,S) catalyst for an efficient PHER and pollutant reduction with these two phases simultaneously adjustable by S-/O-doping to build an appropriate energy band structure.…”