A metal–organic framework-derived Zn_1−xCd_xS/CdS heterojunction for efficient visible light-driven photocatalytic hydrogen production

Abstract

The ZCS-C (ZnCdS/CdS) QDs are synthesized via low-temperature vulcanization with zeolitic imidazolate framework-8 (ZIF-8) nanoparticles as a precursor, cation exchange, and heterojunction construction. Without any precious metal as a cocatalyst,...

Band-Gap Modulation for Enhancing NO Photocatalytic Oxidation over Hollow ZnCdS: A Combined Experimental and Theoretical Investigation

“…To further investigate the separation efficiency of the electron–hole of the sample, the prepared sample electrode was subjected to four cycles of switching experiments under visible light to monitor the instantaneous current density. More significant density indicated a better electron–hole separation efficiency . As shown in Figure a, current signals were detected for all samples, with the strongest signal for Zn 0.5 Cd 0.5 S. Notably, Zn 0.25 Cd 0.75 S exhibited a stronger signal than Zn 0.75 Cd 0.25 S, probably because Zn 0.25 Cd 0.75 S has smaller band-gap energy and produces more photogenerated electrons under the same light conditions.…”

“…The SEM and TEM images of Zn 0.5 Cd 0.5 S in Figure b show that Zn 0.5 Cd 0.5 S still exhibited a rhombic dodecahedral morphology and formed a hollow structure inside. It indicated that ZIF-8 still retained an excellent framework structure after being sulfurized by TAA and that the ion exchange with Cd 2+ did not destroy its structural integrity . In addition, the results of the Zn 0.5 Cd 0.5 S elemental analysis are shown in Figure c, indicating that Zn, Cd, and S elements were homogeneously distributed in the hollow Zn 0.5 Cd 0.5 S material.…”

“…Zhang 28 et al doped hollow ZnCdS cages containing S vacancies with interstitial P, significantly increasing the electronic lifetime of the material. Bu et al 29 synthesized ZnCdS/CdS QDs by lowtemperature sulfidation, which effectively promoted the photogeneration of electrons and holes.…”

Recent Advances in the Hydrogen Evolution Reaction of ZnxCd1−xS‐Based Photocatalysts

“…Based on the mechanism analysis of the heterojunction photocatalysts, researchers have also widely studied Zn x Cd 1− x S‐based heterojunction photocatalysts to achieve higher PHE rates. The representative type‐II heterojunction photocatalysts are Zn x Cd 1− x S/CdS, [ 56 ] Zn x Cd 1− x S/Co 3 O 4 , [ 57 ] and Zn 0.5 Cd 0.5 S/NiSe 2 , [ 58 ] and Z‐scheme heterojunction photocatalysts include Zn x Cd 1− x S/Co 9 S 8 , [ 59 ] Zn 0.3 Cd 0.7 S/Fe 2 O 3 , [ 60 ] and Zn 0.4 Cd 0.6 S/α‐Fe 2 O 3 . [ 61 ] Excluding the type‐II and Z‐scheme catalysts, Zn x Cd 1‐ x S‐based heterojunctions with other types have also been developed, including 2D/0D Zn 0.5 Cd 0.5 S/Ni(OH) 2 , [ 62 ] hybrid ZnCdS–rGO/MoS 2 , [ 63 ] and type‐I CdS@ZnCdS/WS 2 .…”

Synthesis of a Zr4(embonate)6–cobalt based superstructure for photocatalytic hydrogen production

“…[15][16][17][18][19][20] After the pioneering work by Mori et al on a Ru-MOF that was used for water reduction to hydrogen, 21 an increasing number of MOFs as photocatalysts for hydrogen production were reported. [22][23][24][25][26][27][28][29][30][31] In order to improve the catalytic effect, it is often desirable to have exposed and rich metal active sites in the open frameworks. However, it is challenging to obtain these target materials because of uncontrollable factors in the synthesis process.…”