CdS Reinforced with CoS_X/NiCo‐LDH Core‐shell Co‐catalyst Demonstrate High Photocatalytic Hydrogen Evolution and Durability in Anhydrous Ethanol

Abstract

At present, inefficient charge separation of single photocatalyst impedes the development of photocatalytic hydrogen evolution. In this work, the CoS X /NiCo-LDH coreshell co-catalyst was cleverly designed, which exhibit high activity and high stability of hydrogen evolution in anhydrous ethanol system when coupled with CdS. Under visible light (λ � 420 nm) irradiation, the 3 %Co/NiCo/CdS composite photocatalyst exhibits a surprisingly high photocatalytic hydrogen evolution rate of 20.67 mmol g À 1 h À 1 , which is 59 times than that of the original CdS. Continuous light for 20 h still showed good cycle stability. In addition, the 3 %Co/NiCo/CdS composite catalyst also shows good hydrogen evolution performance under the Na 2 S/Na 2 SO 3 and lactic acid system. The fluorescence (PL), ultraviolet-visible diffuse reflectance (UV-vis) and photoelectrochemical tests show that the coupling of CdS and CoS X /NiCo-LDH not only accelerates the effective transfer of charges, but also greatly increases the absorption range of CdS to visible light. Therefore, the hydrogen evolution activity of the composite photocatalyst has been significantly improved. This work will provide new insights for the construction of new co-catalysts and the development of composite catalysts for hydrogen evolution in multiple systems.

Co-catalyst and heterojunction dual strategies to induce photogenerated charge separation for efficient hydrogen evolution of CdS

“…4(c), the binding energies at 162.5 eV and 161.3 eV are correlated with S 2p 1/2 and S 2p 3/2 , which implies that the S element is present in the S 2− state. 40 The characteristic peaks at 873.3 eV and 871.3 eV in Fig. 4(d) belong to Ni 2p 1/2 and 855.8 eV and 853.6 eV belong to Ni 2p 3/2 .…”

“…1(b), the crystal structure of CdS is consistent with our previously reported work. 40 The diffraction peaks at 24.8°, 26.6°, 28.2°, 36.7°, 43.7°, 48.0°, and 51.9° correspond to the (100), (002), (001), (102), (110), (103) and (112) crystal planes of CdS (JCPDS: 65-3414), respectively. Similarly, the diffraction peaks at 37.2°, 43.2° and 62.8° correspond to the (111), (200) and (220) crystal planes of NiO (JCPDS: 71-1179).…”

“…CdS and Cu 3 P were synthesized with reference to the previously reported works. 40,41 NiMOF was synthesized by the hydrothermal method. Typical: 440 mg of Ni(NO 3 ) 2 •6H 2 O, 120 mg of terephthalic acid (PTA), and 0.6 g of polyvinylpyrrolidone (PVP) were dispersed in 30 mL of mixed solution (deionized water : ethanol : DMF = 1 : 1 : 1).…”

The methodologically obtained derivative of ZIF-67 metal–organic frameworks present impressive supercapacitor performance

“…The preparation of ZIF-67 was based on the reported work. 38 Typically, 0.725 g of cobaltous nitrate hexahydrate (Co(NO 3 ) 2 Á 6H 2 O) and 1.6 g 2-methylimidazole were dissolved in 50 mL methanol, which were recorded as solution A and solution B, respectively. Then, the two solutions were placed on a magnetic stirrer and stirred for 30 minutes.…”

P-Induced In Situ Construction of ZnCoMOF@CoP-5 S-Scheme Heterojunctions for Enhanced Photocatalytic H2 Evolution

“…Photocatalytic hydrogen production utilizes solar energy to decompose water to generate hydrogen under the action of semiconductor catalysis, which is considered to be a potential feasible strategy. − In theory, photocatalysts can use the most abundant and clean solar energy in nature to realize energy conversion. For a long time, researchers have reported many types of photocatalysts, for example, oxides, sulfides, and nitrides. − In previous studies, it is not difficult to find that a single semiconductor is often affected by the low utilization of light energy the serious recombination of e – –h + pairs, and it is almost impossible to achieve the unity of high-efficiency performance and stability. − For this reason, the above problems are often solved by introducing precious metals or constructing special heterojunctions. However, the high price of precious metals (Pt, Rh, and Pd) limits practical applications from an economical point of view.…”