Construction of dual Z-scheme NiO/NiFe2O4/Fe2O3 photocatalyst via incomplete solid state chemical combustion reactions for organic pollutant degradation with simultaneous hydrogen production

Multifunctional Na-enriched Ni–Fe/Ni–P plates for highly efficient photo- and electrocatalytic water splitting reactions

“…63 The results of XRD analysis revealed that the catalyst system contains sodium-enriched NiO, Fe 2 O 3 and NiFe 2 O 4 , thus the band gap exhibited is the collective band gap of sodium-enriched Ni–Fe mixed oxides, responsible for absorbing entire UV-Vis spectra of the natural sunlight. 64…”

“…Among these oxides on this heterostructure, NiO (+2.81 V) has a higher valence band energy (positive potential), while NiFe 2 O 4 (À0.86 V) has a higher conduction band energy (negative potential). 64,84 The conduction band position of nickel oxide (À0.31 V), iron oxide (0.26 V) and NaNiO 2 merely lies on the valence band position of NiFe 2 O 4 (+0.84). 64 During photolysis, photoinduced electrons of metal oxides are transferred to the valence band of NiFe 2 O 4 and these electrons are excited to its conduction band, where water get reduced to hydrogen gas.…”

“…64,84 The conduction band position of nickel oxide (À0.31 V), iron oxide (0.26 V) and NaNiO 2 merely lies on the valence band position of NiFe 2 O 4 (+0.84). 64 During photolysis, photoinduced electrons of metal oxides are transferred to the valence band of NiFe 2 O 4 and these electrons are excited to its conduction band, where water get reduced to hydrogen gas. This rich flow of electrons to the CB of NiFe 2 O 4 stimulates hydrogen production.…”

“…72 During the dye degradation process, photo-induced holes of NiO, NaNiO 2 and Fe 2 O 3 can directly oxidize the dye to carbon dioxide and water. 64…”

Visible light‐driven Z‐scheme NiO/BiO2−x heterojunction for efficient degradation of organic pollutants in water

“…NiO is a wide-band gap p-scheme semiconductor with unique electronic structure and widely used in photoelectric catalysis, sensors, UV detectors, and other fields. [18][19][20] Moreover, the low-cost NiO compounded with band gap-matched semiconductor materials, such as NiO/Ag 3 PO 4 , NiO/Bi 2 WO 6 and NiO/g-C 3 N 4 , which can effectively improve the photocatalytic performance of heterojunction. [7,21,22] We found that NiO (E CB = À0.09 eV, E VB = 2.61 eV) has a suitable band structure and matches well with BiO 2Àx (E CB = À0.…”