Facile fabrication of CdSe/CuInS2 microflowers with efficient photocatalytic hydrogen production activity

Wang, Ying; Peng, Jiaru; Xu, Yangfan; Zhao, Ruiyang; Han, Jishu; Wang, Lei

doi:10.1016/j.ijhydene.2021.12.182

Cited by 59 publications

(27 citation statements)

References 74 publications

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“…The abundance of active sites predominantly controls the rate of the surface redox reactions; therefore, a high surface area of the catalyst is very beneficial for the photocatalytic process [38]. As displayed in Figure 6a, ZnO, the ZnO 0.7 /TiC 0.3 and ZnO 0.6 /TiC 0.4 composites exhibited type IV N 2 adsorption-desorption isotherms.…”

Section: The Mechanism Of Improved H 2 Evolution Activitymentioning

confidence: 99%

“…Under the Moreover, the band structures and charge transfer directions of the as-prepared ZnO and ZnO 0.7 /TiC 0.3 samples were evaluated by Mott-Schottky (MS) analysis as shown in Figure 6b. The positive slopes of the MS analysis identified both candidates as n-type semiconductors with flat band potentials (E FB ) of −1.07 and −0.74 V vs. Ag/AgCl for bare ZnO and ZnO 0.7 /TiC 0.3 composites, respectively [36][37][38][39][40]. These values were correspondent to −0.87 and −0.54 V vs. NHE using the transformation formula: E NHE = E Ag/AgCl + 0.197) [38].…”

Section: The Mechanism Of Improved H2 Evolution Activitymentioning

confidence: 99%

“…The positive slopes of the MS analysis identified both candidates as n-type semiconductors with flat band potentials (E FB ) of −1.07 and −0.74 V vs. Ag/AgCl for bare ZnO and ZnO 0.7 /TiC 0.3 composites, respectively [36][37][38][39][40]. These values were correspondent to −0.87 and −0.54 V vs. NHE using the transformation formula: E NHE = E Ag/AgCl + 0.197) [38]. Therefore, owing to the equivalency of the Fermi level (E f ) with E FB , the E f of ZnO and ZnO 0.7 /TiC 0.3 were found to be −0.87 and −0.54 V vs. NHE, respectively.…”

Section: The Mechanism Of Improved H2 Evolution Activitymentioning

confidence: 99%

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Construction of 0D/2D Schottky Heterojunctions of ZnO and Ti3C2 Nanosheets with the Enriched Transfer of Interfacial Charges for Photocatalytic Hydrogen Evolution

et al. 2022

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The development of cost-effective co-catalysts of high photocatalytic activity and recyclability is still a challenge in the energy transformation domain. In this study, 0D/2D Schottky heterojunctions, consisting of 0D ZnO and 2D Ti3C2, were successfully synthesized by the electrostatic self-assembling of ZnO nanoparticles on Ti3C2 nanosheets. In constructing these heterojunctions, Ti3C2 nanosheets acted as a co-catalyst for enhancing the transfer of excitons and their separation to support the photocatalytic response of ZnO. The as-prepared ZnO/Ti3C2 composites demonstrate an abbreviated charge transit channel, a huge interfacial contact area and the interfacial electrons’ transport potential. The extended optical response and large reactive area of the ZnO/Ti3C2 composite promoted the formation of excitons and reactive sites on the photocatalyst’s surface. The ZnO/Ti3C2 Schottky heterojunction showed significantly high photocatalytic activity for hydrogen production from a water–ethanol solution under the light illumination in the visible region. The hydrogen evolution overoptimized the ZnO/Ti3C2 composition with 30 wt.% of Ti3C2, which was eight times higher than the pristine ZnO. These findings can be helpful in developing 0D/2D heterojunction systems for photocatalytic applications by utilizing Ti3C2 as a low-cost co-catalyst.

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Section: The Mechanism Of Improved H 2 Evolution Activitymentioning

confidence: 99%

Section: The Mechanism Of Improved H2 Evolution Activitymentioning

confidence: 99%

Section: The Mechanism Of Improved H2 Evolution Activitymentioning

confidence: 99%

See 1 more Smart Citation

Construction of 0D/2D Schottky Heterojunctions of ZnO and Ti3C2 Nanosheets with the Enriched Transfer of Interfacial Charges for Photocatalytic Hydrogen Evolution

et al. 2022

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“…The electrochemical impedance spectrum (Figure S4b) shows that the resistance will be reduced after the introduction of Ag compared with CdSe nanosheets, and the carrier transport will become smoother. Meanwhile, the steady-state fluorescence results also indicate (Figure S4c) that the Ag doping gradually reduces the fluorescence intensity of CdSe nanosheets and limits the complexation of photoelectron–hole pairs in CdSe nanosheets . The above results further confirm that the Ag-doped CdSe nanosheets have higher charge separation efficiency and effective utilization of photogenerated charges.…”

Section: Resultsmentioning

confidence: 52%

Ag-Doped CdSe Nanosheets as Photocatalysts for Uranium Reduction

Dong

Sun

et al. 2022

ACS Appl. Nano Mater.

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Doping is a simple method to modulate the electronic configuration of semiconductor photocatalysts. This study regulated the energy band structure of CdSe nanosheets by Ag doping, which reduced the energy bandwidth of CdSe nanosheets by increasing the carrier density, thereby improving the efficiency of the photocatalytic reduction of uranium by CdSe nanosheets. A 96% removal of U(VI) was achieved by 3% Ag-CdSe nanosheets, which was 1.9 and 1.2 times higher than that of pristine CdSe nanosheets (50%), and 1% Ag-CdSe nanosheets (81%), respectively. Additionally, at pH = 4.0 and a solid−liquid ratio of 0.25, the reduction of uranium by 3% Ag-CdSe nanosheets (765 mg/g) was 2.2 times higher than that of pristine CdSe nanosheets (345.6 mg/g). This study provides a new idea for other efficient photocatalysts designed for uranium reduction.

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“…Owing to its durability, low toxicity, appropriate band gap, and good solar energy conversion efficiency, I-III-VI ternary metal sulfide semiconductors have received a lot of research attention thus far (Li et al, 2018;Zhang et al, 2021). Copper indium sulfide (CuInS 2 ) is a promising I-III-VI 2 ternary chalcopyrite material with a wide range of advantages for photocatalytic and photovoltaic applications (Yang et al, 2021b;Spera et al, 2022;Wang et al, 2022). Its conduction band is made up of In 5s orbitals, and its valence band is made up of S 3p orbitals, resulting in a small band-gap (1.53 eV for the bulk CuInS 2 ) (Chumha et al, 2020;Guo et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Synergistic Cr(VI) Reduction and Chloramphenicol Degradation by the Visible-Light-Induced Photocatalysis of CuInS2: Performance and Reaction Mechanism

Zhu

Chai

et al. 2022

Front. Chem.

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Despite significant scientific efforts in the field of water treatment, pollution of drinking water by toxic metal ions and synthetic organic compounds is becoming an increasing problem. The photocatalytic capabilities of CuInS2 nanoparticles were examined in this study for both the degradation of chloramphenicol (CAP) and the reduction of Cr(VI). CuInS2 nanoparticles were produced using a straightforward solvothermal approach and subsequently characterized by many analysis techniques. Simultaneous photocatalytic Cr(VI) reduction and CAP oxidation by the CuInS2 nanoparticles under visible-light demonstrated that lower pH and sufficient dissolved oxygen favored both Cr(VI) reduction and CAP oxidation. On the basis of active species quenching experiments, the possible photocatalytic mechanisms for Cr(VI) conversion with synchronous CAP degradation were proposed. Additionally, the CuInS2 retains a high rate of mixed pollutant removal after five runs. This work shows that organic contaminants and heavy metal ions can be treated concurrently by the visible-light-induced photocatalysis of CuInS2.

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Facile fabrication of CdSe/CuInS2 microflowers with efficient photocatalytic hydrogen production activity

Cited by 59 publications

References 74 publications

Construction of 0D/2D Schottky Heterojunctions of ZnO and Ti3C2 Nanosheets with the Enriched Transfer of Interfacial Charges for Photocatalytic Hydrogen Evolution

Construction of 0D/2D Schottky Heterojunctions of ZnO and Ti3C2 Nanosheets with the Enriched Transfer of Interfacial Charges for Photocatalytic Hydrogen Evolution

Ag-Doped CdSe Nanosheets as Photocatalysts for Uranium Reduction

Synergistic Cr(VI) Reduction and Chloramphenicol Degradation by the Visible-Light-Induced Photocatalysis of CuInS2: Performance and Reaction Mechanism

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