CdS Nanorods and ZnCd-PBA Construct a Direct S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Abstract

The design of an S-scheme heterojunction can promote the transfer of photogenerated electrons, which is an effective method to improve the activity of photocatalytic hydrogen production. In this work, CdS/ZnCd-PBA composite catalysts were prepared by a simple physical method, and a CdS/ZnCd-PBA S-scheme heterojunction was designed. The close contact between the interface of the two catalysts is conducive to the rapid transfer of photogenerated carriers, providing a new path for electron transfer. The hydrogen production of a CdS/ZnCd-PBA catalyst with a ZnCd-PBA content of about 15% was 962 μmol under simulated light for 5 h, which was 13 and 916 times higher than those of CdS and ZnCd-PBA, respectively. At the same time, CdS/ZnCd-PBA-15 composites also showed good long-term stability. It shows that the construction of the S-scheme heterojunction promotes the separation of electron–hole pairs, which can effectively improve hydrogen production activity.

Constructing a Z-Scheme Co3O4/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations

“…The HRTEM image (Figure e) displays two sets of lattice fringes with spacings of 0.283 and 0.285 nm, corresponding to the (102) crystal facet of BiOBr and the (220) crystal facet of Co 3 O 4 , respectively. Therefore, these observations can verify the formation of the Co 3 O 4 /BiOBr heterojunction, where the photogenerated carriers can be rapidly migrated through the well-matched interfaces . Moreover, the elemental mapping images (Figure f1–f4) indicate the presence and even distribution of Bi, Br, and Co.…”

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO3/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

“…The HRTEM result confirms the formation of BaTiO 3 /BiOBr heterojunction, in which the interfaces match well to facilitate the rapid transfer of photogenerated carriers. 49 Figure 1f1−f6 provides the element mapping images of BTBB-10. We can see that Bi, Br, and O are evenly distributed over the whole sample, while Ba and Ti are inhomogeneously aggregated in some areas.…”

“…The interplanar spacings of the (102) and (111) crystal planes are determined to be 0.282 and 0.231 nm, respectively. The HRTEM result confirms the formation of BaTiO 3 /BiOBr heterojunction, in which the interfaces match well to facilitate the rapid transfer of photogenerated carriers Figure f1–f6 provides the element mapping images of BTBB-10.…”

Co3O4@SnO2/graphdiyne type-II heterojunction and p–n heterojunction jointly enhance photocatalytic hydrogen production: Co–O–Sn bond as a bridge for electron transfer

“…As a result, the composite catalyst CSG-1.5 demonstrates the highest transient photocurrent intensity. 50 EIS spectra offer valuable information about the conductivity of composite catalysts and individual catalysts. Generally speaking, the radius of curvature of the EIS diagram is directly proportional to the impedance of the working electrode and the resistance of carrier transfer.…”