Designing CdS Mesoporous Networks on Co-C@Co 9 S 8 Double-Shelled Nanocages as Redox-Mediator-Free Z-Scheme Photocatalyst

D. Amaranatha Reddy, Hanbit Park, Madhusudana Gopannagari, Eun Hwa Kim, Seunghee Lee, D. Praveen Kumar, Tae Kyu Kim

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Designing porous nanostructures with unprecedented functionalities and an effective ability to harvest the maximum energy region of the solar spectrum and suppress the charge-carrier recombination rate offers promising potential for sustainable energy production. Although several functional porous nanostructures have been developed, high-efficiency materials are still needed. Herein, we report a new, highly active, noble-metal-free, and redox-mediator-free Z-scheme photocatalyst, CdS/Co-C@Co 9 S 8 , for H 2 production through water splitting under solar irradiation. The designed photocatalytic system contains open 3 D CdS mesopores as a light absorber for wider solar-light harvesting. Metal–organicframework-derived cobalt nanocrystal-embedded few-layered carbon@Co 9 S 8 double-shelled nanocages were used as a co-semiconductor to hamper the photo charge-carrier recombination by accelerating the photogenerated electrons and holes from the other semiconductor. The optimized catalyst shows a H 2 evolution rate of 26.69 mmol g −1 h −1 under simulated solar irradiation, which is 46 times higher than that of the as-synthesized CdS mesoporous nanostructures. The apparent quantum yield reached 7.82 % at λ=425 nm in 5 h. The outstanding photocatalytic activity of CdS/Co-C@Co9S8 reflects the favorable suppression of the charge-carrier recombination rate, as determined by photoluminescence, photocurrent, and impedance analyses. We believe that the findings reported here may inspire the design of new noble-metal-free porous nanohybrids for sustainable H 2 production.

Original languageEnglish
Pages (from-to)245-253
Number of pages9
JournalChemSusChem
Volume11
Issue number1
DOIs
Publication statusPublished - 2018 Jan 10

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Photocatalysts
Charge carriers
recombination
Nanostructures
Precious metals
irradiation
Irradiation
Semiconductor materials
metal
Open systems
Quantum yield
Cobalt
Photocurrents
cobalt
Nanocrystals
Photoluminescence
Carbon
catalyst
electron
Hydrogen

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Cite this

Reddy, D. Amaranatha ; Park, Hanbit ; Gopannagari, Madhusudana ; Kim, Eun Hwa ; Lee, Seunghee ; Kumar, D. Praveen ; Kim, Tae Kyu. / Designing CdS Mesoporous Networks on Co-C@Co 9 S 8 Double-Shelled Nanocages as Redox-Mediator-Free Z-Scheme Photocatalyst In: ChemSusChem. 2018 ; Vol. 11, No. 1. pp. 245-253.
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abstract = "Designing porous nanostructures with unprecedented functionalities and an effective ability to harvest the maximum energy region of the solar spectrum and suppress the charge-carrier recombination rate offers promising potential for sustainable energy production. Although several functional porous nanostructures have been developed, high-efficiency materials are still needed. Herein, we report a new, highly active, noble-metal-free, and redox-mediator-free Z-scheme photocatalyst, CdS/Co-C@Co 9 S 8 , for H 2 production through water splitting under solar irradiation. The designed photocatalytic system contains open 3 D CdS mesopores as a light absorber for wider solar-light harvesting. Metal–organicframework-derived cobalt nanocrystal-embedded few-layered carbon@Co 9 S 8 double-shelled nanocages were used as a co-semiconductor to hamper the photo charge-carrier recombination by accelerating the photogenerated electrons and holes from the other semiconductor. The optimized catalyst shows a H 2 evolution rate of 26.69 mmol g −1 h −1 under simulated solar irradiation, which is 46 times higher than that of the as-synthesized CdS mesoporous nanostructures. The apparent quantum yield reached 7.82 {\%} at λ=425 nm in 5 h. The outstanding photocatalytic activity of CdS/Co-C@Co9S8 reflects the favorable suppression of the charge-carrier recombination rate, as determined by photoluminescence, photocurrent, and impedance analyses. We believe that the findings reported here may inspire the design of new noble-metal-free porous nanohybrids for sustainable H 2 production.",
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Designing CdS Mesoporous Networks on Co-C@Co 9 S 8 Double-Shelled Nanocages as Redox-Mediator-Free Z-Scheme Photocatalyst . / Reddy, D. Amaranatha; Park, Hanbit; Gopannagari, Madhusudana; Kim, Eun Hwa; Lee, Seunghee; Kumar, D. Praveen; Kim, Tae Kyu.

In: ChemSusChem, Vol. 11, No. 1, 10.01.2018, p. 245-253.

Research output: Contribution to journalArticle

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