ZIF-67 derived hierarchical hollow Co₃S₄@Mo₂S₃ dodecahedron with an S-scheme surface heterostructure for efficient photocatalytic hydrogen evolution

Abstract

S-scheme surface heterojunction was constructed in Co3S4@Mo2S3 via the stepwise hydrothermal method. The rhombic dodecahedron cobalt-based metal-organic zeolite imidazole framework (ZIF-67) is used as the cobalt source and template to...

A new synthesis approach of hierarchical MoS2 nanoflakes toward hydrogen evolution in both acidic and alkaline media

“…In addition, diffraction peaks at 2 θ = 29.7° and 35.2° indexed to (110) and (012) planes can be found in u-MoS 2 and m-MoS 2 , indicating the appearance of Mo 2 S 3 phase during the ultrasound and microwave assisted syntheses. 26,27 Furthermore, with the synergistic combination of ultrasound and microwaves, higher diffraction density of Mo 2 S 3 can be detected in s-MoS 2 , located at 2 θ = 10.1° and 16.3°, which correspond to (001) and (−101) planes of monoclinic Mo 2 S 3 (JCPDS card no. 81-2031).…”

“d-electron interactions” induced CoV2O6–Fe–NF for efficient oxygen evolution reaction

“…Specifically, Co 3+ peaks demonstrated ∼0.37 eV shift to lower binding energy at 780.62 and 796.53 eV, while Co 2+ peaks display ∼0.86 eV shifted to 782.26 and 797.69 eV. 32–35 The blue shift suggested a lower valence state of Co species in CoV 2 O 6 –Fe–NF, 25 which was further confirmed by a lower Co 3+ /Co 2+ ratio of (0.66) compared with CoV 2 O 6 –NF (0.88) calculated via corresponding peak area.…”

“…The survey XPS spectra reveal the presence of Co, V, Fe, O in CoV 2 O 6 -Fe-NF (Fig. 3a [32][33][34][35] The blue shi suggested a lower valence state of Co species in CoV 2 O 6 -Fe-NF, 25 which was further conrmed by a lower Co 3+ /Co 2+ ratio of (0.66) compared with CoV 2 O 6 -NF (0.88) calculated via corresponding peak area.…”

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

“…The obtained S-scheme heterojunctions were studied in the photocatalytic degradation of various pollutants, such as methyl orange 187 and sulfamethoxazole, 188 as well as in hydrogen evolution. 189,190 Although the pyrolysis of MOFs has attracted widespread attention in recent years for the synthesis of multifunctional photocatalytic materials, 191 this approach seems to be the least promising due to its complexity and high production cost. 9 The development of Step-scheme heterojunctions with MOFs is a more feasible method and it has proven its worth not only for dye degradation, but also for water splitting 192,193 and CO 2 reduction.…”

“…In several studies, MOFs were utilized as precursors for the preparation of photosensitive materials with their further coupling with other semiconductors. The obtained S‐scheme heterojunctions were studied in the photocatalytic degradation of various pollutants, such as methyl orange 187 and sulfamethoxazole, 188 as well as in hydrogen evolution 189,190 . Although the pyrolysis of MOFs has attracted widespread attention in recent years for the synthesis of multifunctional photocatalytic materials, 191 this approach seems to be the least promising due to its complexity and high production cost 9 .…”