Molybdenum disulfide quantum dots directing zinc indium sulfide heterostructures for enhanced visible light hydrogen production

An Efficient ZnIn2S4@CuInS2 Core–Shell p–n Heterojunction to Boost Visible-Light Photocatalytic Hydrogen Evolution

“…To measure the chemical composition of as-prepared photocatalysts, XPS measurement was used to determine the exact surface state. As shown in Figure a, the binding energy Cu 2p 1/2 peak at 951.3 eV and Cu 2p 3/2 peak at 931.3 eV were detected, which demonstrated that Cu existed in the form of Cu 1+ . , For the Zn 2p spectrum (Figure b), two peaks at 1045.1 and 1022.1 eV were assigned to Zn 2p 1/2 and Zn 2p 3/2 of hexagonal ZnIn 2 S 4 , respectively, corresponding to the divalent Zn . The peaks at 452.8 and 445.2 eV were attributed to In 3d 3/2 and In 3d 5/2 for trivalent indium (In 3+ ), respectively .…”

“…43,44 For the Zn 2p spectrum (Figure 4b), two peaks at 1045.1 and 1022.1 eV were assigned to Zn 2p 1/2 and Zn 2p 3/2 of hexagonal ZnIn 2 S 4 , respectively, corresponding to the divalent Zn. 45 The peaks at 452.8 and 445.2 eV were attributed to In 3d 3/2 and In 3d 5/2 for trivalent indium (In 3+ ), respectively. 46 The S peaks were split into two peaks at 162.7 and 161.8 eV, assigned to S 2p 1/2 and S 2p 3/2 , respectively, which were certified as peaks typically characteristic of S 2− in metal sulfides.…”

Engineering of Ni(OH)2 Modified Two-Dimensional ZnIn2S4 Heterostructure for Boosting Hydrogen Evolution under Visible Light Illumination

“…Figure 3 a represents the XPS survey spectra of ZnIn 2 S 4 and 0.37 wt% Ni(OH) 2 /ZnIn 2 S 4 composite, which confirms the existence of the designated elements only except for Ni. Furthermore, as shown in Figure 3 b, Zn 2p XPS spectra of ZnIn 2 S 4 and Ni(OH) 2 /ZnIn 2 S 4 composite exhibit two peaks at 1044.2 and 1021.1 eV, which correspond to Zn 2p 1/2 and Zn 2p 3/2 of ZnIn 2 S 4 , respectively, evidencing the existence of Zn 2+ in the sample [ 30 , 31 ]. Peaks ( Figure 3 c) at 452.2 and 444.5 eV can be indexed to In 3d 3/2 and In 3d 5/2 , confirming that element In in the sample is in the form of a trivalent cation [ 32 ].…”

Recent advances in photodegradation of antibiotic residues in water

“…The addition of photosensitizers is another simple method of enhancing the photoactivity of wide bandgap semiconductors in visible light. In recent years, a variety of QDs (e.g., ZnSe QDs [47] , carbon QDs (CQDs) [64] , [65] , [66] , [68] , [69] , [249] , [250] , [251] , [252] , [253] , graphene [254] , CdS [255] , [256] , Fe 3 O 4 [257] , g-C 3 N 4 [258] , CsPbBr 3 [259] and MoS 2 [260] ) have been combined into semiconductors to enhance light absorption. Among them, CQDs have become the most widely used QDs to upgrade wide-bandgap semiconductors owing to their low cost, non-toxicity, and high stability [250] , [261] .…”