Synthesis of hierarchical Cd-Ni-MOF micro/nanostructures and derived Cd-Ni-MOF/CdS/NiS hybrid photocatalysts for efficient photocatalytic hydrogen evolution

Abstract

Hierarchical micro/nanostructures assembled from nanorods and nanosheets have become a promising candidate for photocatalysis. In this work, a series of hierarchical Cd-Ni-MOF micro/nanostructures, assembled from nanosheets and nanorods, were fabricated...

Synthesis of Hierarchical CdS/NiS Photocatalysts Using Ni−MOF‐74 as Template for Efficient Ethanol Conversion and Hydrogen Production under Visible Light

“…On the other hand, when analyzing the individual NiS samples using XRD, only a straight line without characteristic peaks was obtained, indicating that the prepared NiS exists in an amorphous structure. [16] The characteristic peaks of CdS in the composite material remain obvious and their intensity does not decrease, which suggests that the introduction of NiÀ MOF-74 during the hydrothermal process does not have a significant impact on the crystal structure of CdS in the composite material. The characteristic peak of NiÀ MOF-74 in Figure 3b is also consistent with previous reports, and there is no characteristic peak of NiÀ MOF-74 in CdS/ NiSÀ N(100) and CdS/NiSÀ N(150), indicating the successful removal of the organic framework during the hydrothermal and washing processes.…”

“…This confirms the presence of CdS in the composite material. On the other hand, when analyzing the individual NiS samples using XRD, only a straight line without characteristic peaks was obtained, indicating that the prepared NiS exists in an amorphous structure [16] . The characteristic peaks of CdS in the composite material remain obvious and their intensity does not decrease, which suggests that the introduction of Ni−MOF‐74 during the hydrothermal process does not have a significant impact on the crystal structure of CdS in the composite material.…”

“…[15] Similarly, Wang et al sulfurized CdÀ NiÀ MOF to form CdÀ NiÀ MOFÀ T/CdS/NiS hierarchical micro/nanostructures with multiple heterojunctions for improving photocatalytic performance. [16] Therefore, loading NiS on CdS by using MOFs as template has significantly enhanced the photocatalytic performance of the composites, but there is limited research on the utilization of CdS/NiS as a photocatalyst for ethanol conversion.…”

The synthesis of CdS hierarchical micro-nanostructures with different pore structure and their influence on the photocatalytic ethanol transformation

“…CdS-N/0 showed the highest photocurrent response, resulting in excellent light-induced electrical performance. Figure 7d shows that the arc radii of the CdS-N/0 sample is the smallest, indicating the bene ts of the Photocatalytic performance [43]. Therefore, the onedimensional net-like morphology of CdS-N/0 catalysts can promote the separation and transfer of photogenerated charges, which can effectively improve photocatalytic performance.…”

“…7a, the evident and narrow absorption edges show good visible light absorption [32]. Figure 7b shows the converted plots based on the Kubelka-Munk function vs. photon energy, from which the bandgap (Eg) energy of CdS-F/0, CdS-PF/0.2, and CdS-N/0 can be roughly estimated to be 2.33, 2.31, and 2.36 eV, respectively [43]. The band gaps of the sample CdS are all slightly redshifted compared to the bulk CdS (2.42 eV) [44].…”