Special Issue "Advanced Materials for Artificial Photosynthesis and Photoredox Catalysis"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (31 August 2021).

Special Issue Editor

Prof. Dr. Jacinto Sá
E-Mail Website
Guest Editor
Department of Chemistry-Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden
Interests: plasmonic hybrid systems; artificial photosynthesis; solar cells; ultrafast spectroscopy
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Proficient conversion of light into storable energy and chemicals is vital for sustainable human development. Nature has mastered this in its photosynthesis process, which has been subsequently used as inspiration for manmade processes to convert solar light into chemical bonds, which guarantees storable energy deprived of greenhouse gas emission. Manmade developments or also called artificial photosynthesis include processes, such as water splitting and CO2 reduction. The concept was recently expanded to photoredox catalysis, where light is used to create complex molecules.

Advanced materials have been central to artificial photosynthesis and photoredox catalysis processes developments, either as light absorbers, charge particles relays and/or storage, catalysts, or as combination of them. Significant advances have been made when achieved when materials are combined with molecular structures, namely improvement of light harvesting, prolonging charge separation state lifetime, and increase in catalytic activity and selectivity. Additionally, they provide perfect platforms for fundamental studies of light interaction with matter and photocatalysis.

This Special Issue aims to capture the most recent developments on artificial photosynthesis and photoredox catalysis with advanced materials. These reports can cover aspects from photocatalysis to photophysics and photochemistry studies.

Prof. Dr. Jacinto Sá
Guest Editor

Manuscript Submission Information

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Keywords

  • light to chemicals
  • photocatalysis
  • spectroscopic studies
  • reactor engineering
  • advanced materials

Published Papers (1 paper)

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Research

Article
Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting
Nanomaterials 2021, 11(9), 2338; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11092338 - 08 Sep 2021
Viewed by 453
Abstract
To improve photoelectrochemical (PEC) water splitting, various ZnO nanostructures (nanorods (NRs), nanodiscs (NDs), NRs/NDs, and ZnO NRs decorated with gold nanoparticles) have been manufactured. The pure ZnO nanostructures have been synthesized using the successive ionic-layer adsorption and reaction (SILAR) combined with the chemical [...] Read more.
To improve photoelectrochemical (PEC) water splitting, various ZnO nanostructures (nanorods (NRs), nanodiscs (NDs), NRs/NDs, and ZnO NRs decorated with gold nanoparticles) have been manufactured. The pure ZnO nanostructures have been synthesized using the successive ionic-layer adsorption and reaction (SILAR) combined with the chemical bath deposition (CBD) process at various deposition times. The structural, chemical composition, nanomorphological, and optical characteristics have been examined by various techniques. The SEM analysis shows that by varying the deposition time of CBD from 2 to 12 h, the morphology of ZnO nanostructures changed from NRs to NDs. All samples exhibit hexagonal phase wurtzite ZnO with polycrystalline nature and preferred orientation alongside (002). The crystallite size along (002) decreased from approximately 79 to 77 nm as deposition time increased from 2 to 12 h. The bandgap of ZnO NRs was tuned from 3.19 to 2.07 eV after optimizing the DC sputtering time of gold to 4 min. Via regulated time-dependent ZnO growth and Au sputtering time, the PEC performance of the nanostructures was optimized. Among the studied ZnO nanostructures, the highest photocurrent density (Jph) was obtained for the 2 h ZnO NRs. As compared with ZnO NRs, the Jph (7.7 mA/cm2) of 4 min Au/ZnO NRs is around 50 times greater. The maximum values of both IPCE and ABPE are 14.2% and 2.05% at 490 nm, which is closed to surface plasmon absorption for Au NPs. There are several essential approaches to improve PEC efficiency by including Au NPs into ZnO NRs, including increasing visible light absorption and minority carrier absorption, boosting photochemical stability, and accelerating electron transport from ZnO NRs to electrolyte carriers. Full article
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