Construction of Z-scheme Photocatalyst Containing ZnIn2S4, Co3O4-Photodeposited BiVO4 (110) Facets and rGO Electron Mediator for Overall Water Splitting into H2 and O2

Carbon Nanotube/ZnIn2S4 Nanocomposites with Efficient Spatial Charge Separation and Migration for Solar H2 Generation

“…Some studies have indicated that the positive shift of element bond energy means lower charge density. 32 The decrease in binding energy of CNT/ZIS proves a strong electronic interaction between CNTs and ZIS, and the presence of CNTs enhances the electron cloud density around Zn and In. The peaks at 164.0 and 165.1 eV are fitted into S 2p3/2 and S 2p1/2 on ZIS.…”

“…The peaks of In 3d and Zn 2p in CNT/ZIS composite materials are shifted to low values by 0.4 and 0.7 eV compared to these binding energies of bare ZIS. Some studies have indicated that the positive shift of element bond energy means lower charge density . The decrease in binding energy of CNT/ZIS proves a strong electronic interaction between CNTs and ZIS, and the presence of CNTs enhances the electron cloud density around Zn and In.…”

Latest Progress on Photocatalytic H2 Production by Water Splitting and H2 Production Coupled with Selective Oxidation of Organics over ZnIn2S4-Based Photocatalysts

“…90 As depicted in Figure 10, Z-scheme photocatalysts are generally considered to be more effective to simultaneously produce H 2 and O 2 separately from two photocatalysts, making 110) crystal plane of BiVO 4 played an important role in optimizing its OER activity. 153 Precious metal Au nanoparticles were also used as electron mediators in the ZnIn 2 S 4 −Au−TiO 2 all-solid-state indirect Z-scheme heterojunction for overall water splitting. 154 Ding et al 155 fabricated the PtS−ZnIn 2 S 4 /WO 3 −MnO 2 direct Z-scheme heterojunction through self-assembly of ZnIn 2 S 4 nanosheets on the surface of the hexagonal WO 3 nanorod.…”

“…Although the activity is relatively low (30.8 μmol g –1 h –1 for H 2 and 15.7 μmol g –1 h –1 for O 2 ) and cocatalysts are needed, their work provides a new idea to fabricate an overall water splitting system by choosing the appropriate HER and OER photocatalysts. Ou et al constructed the Pt-ZnIn 2 S 4 /RGO/BiVO 4 (110)-Co 3 O 4 indirect Z-scheme heterojunction, which evolved 294.3 and 143.4 μmol g –1 of H 2 and O 2 , respectively, after visible light illumination for 12 h. They indicated that the exposed (110) crystal plane of BiVO 4 played an important role in optimizing its OER activity . Precious metal Au nanoparticles were also used as electron mediators in the ZnIn 2 S 4 –Au–TiO 2 all-solid-state indirect Z-scheme heterojunction for overall water splitting …”

“…As reviewed above, ZnIn 2 S 4 possesses a suitable band structure for the water redox reaction, yet it generally needs to add hole scavengers for H 2 evolution from H 2 O due to slow OER kinetics 151 and fast recombination of photoexcited charge carriers, 70 9c). 90 As depicted in Figure 10, Z-scheme photocatalysts are generally considered to be more effective to simultaneously produce H 2 and O 2 separately from two photocatalysts, making 153 Precious metal Au nanoparticles were also used as electron mediators in the ZnIn 2 S 4 −Au−TiO 2 all-solid-state indirect Z-scheme heterojunction for overall water splitting. 154 Ding et al 155 fabricated the PtS−ZnIn 2 S 4 /WO 3 −MnO 2 direct Z-scheme heterojunction through self-assembly of ZnIn 2 S 4 nanosheets on the surface of the hexagonal WO 3 nanorod.…”