Special Issue "Photocatalytic Water Splitting"

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Metal Catalysis".

Deadline for manuscript submissions: 31 August 2018

Special Issue Editors

Guest Editor
Prof. Marcelino Maneiro

Department of Inorganic Chemistry, Faculty of Sciences, University of Santiago de Compostela, Lugo 27002, Spain
Website | E-Mail
Interests: biomimetic catalysts; water splitting; manganese; bioinorganic; artificial photosynthesis; peroxidase; catalase
Guest Editor
Dr. Pau Farràs Costa

School of Chemistry, National University of Ireland Galway, University Road, H91 CF50 Galway, Ireland
Website | E-Mail
Interests: water splitting; artificial photosynthesis; photochemistry; photoactive materials; nanomaterials

Special Issue Information

Dear Colleagues,

Photocatalytic water splitting constitutes one major goal that addresses both the fundamental science and practical applications of renewable energy production. The Oxygen Evolving Complex (OEC) is the native enzyme that catalyzes the oxidation of water in natural photosynthesis to release oxygen. The creation of biomimetic systems to reproduce the basic chemistry of this process gives us more insight into better understanding this crucial natural reaction which is responsible of the atmospheric oxygen that we breathe. On the other hand, the growing world energy demand, along with the need for control of gas emissions, explains the current relevance of the conversion of solar energy to hydrogen by means of water splitting process. Decomposing water is the more direct way to produce hydrogen, which can be stored and utilized as a transportable fuel or converted into energy-rich organic molecules, to cope with the intermittent character of the solar radiation.

This Special Issue aims to cover recent progress and developments in fabricating stable and highly active catalysts for photochemical water oxidation. Moreover, the research for understanding the fine details of natural photosynthesis, as well as the advances in the area of solar-powered fuel generation, should be important subjects for this Special Issue.

Prof. Dr. Marcelino Maneiro
Dr. Pau Farràs Costa
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1300 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Water splitting
  • artificial photosynthesis
  • photocatalysts
  • hydrogen generation
  • oxygen evolution
  • carbon dioxide
  • renewable energy
  • energy storage

Published Papers (2 papers)

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Research

Open AccessArticle High Performance of Manganese Porphyrin Sensitized p-Type CuFe2O4 Photocathode for Solar Water Splitting to Produce Hydrogen in a Tandem Photoelectrochemical Cell
Catalysts 2018, 8(3), 108; https://doi.org/10.3390/catal8030108
Received: 22 January 2018 / Revised: 3 March 2018 / Accepted: 6 March 2018 / Published: 9 March 2018
Cited by 1 | PDF Full-text (1976 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A novel composite composed of (5, 10, 15, 20-tetraphenyl) porphinato manganese sensitized p-type CuFe2O4 was developed for constructing the photocathode of a tandem photoelectrochemical (PEC) cell. The prepared material was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray
[...] Read more.
A novel composite composed of (5, 10, 15, 20-tetraphenyl) porphinato manganese sensitized p-type CuFe2O4 was developed for constructing the photocathode of a tandem photoelectrochemical (PEC) cell. The prepared material was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (DRS). Light-driven water splitting to produce hydrogen can be achieved through the PEC cell, and the results show that H2 and O2 can be collected separately at low applied bias. This work demonstrates that manganese porphyrin sensitized CuFe2O4 is an effective hybrid material for building the photocathode of a PEC cell for solar water splitting to produce H2. Full article
(This article belongs to the Special Issue Photocatalytic Water Splitting)
Figures

Figure 1

Open AccessArticle Hydrogen Production via Water Dissociation Using Pt–TiO2 Photocatalysts: An Oxidation–Reduction Network
Catalysts 2017, 7(11), 324; https://doi.org/10.3390/catal7110324
Received: 18 September 2017 / Revised: 18 October 2017 / Accepted: 18 October 2017 / Published: 30 October 2017
Cited by 1 | PDF Full-text (4035 KB) | HTML Full-text | XML Full-text
Abstract
Several TiO2 based semiconductors with different Pt loadings are prepared using incipient impregnation, wet impregnation and the sol-gel method. These photocatalysts are evaluated in the Photo-CREC-Water II Photoreactor for hydrogen production via water dissociation, using an organic renewable scavenger (ethanol). Results obtained
[...] Read more.
Several TiO2 based semiconductors with different Pt loadings are prepared using incipient impregnation, wet impregnation and the sol-gel method. These photocatalysts are evaluated in the Photo-CREC-Water II Photoreactor for hydrogen production via water dissociation, using an organic renewable scavenger (ethanol). Results obtained show the influence of the photocatalyst preparation in the production of hydrogen and in the observed quantum yields. Furthermore, it is established that the reaction networks leading to hydrogen production, using various photocatalysts, share common features. This analysis is developed by both identifying and quantifying different chemical species and their changes with irradiation time. Key species in this oxidation–reduction network are hydrogen, hydrogen peroxide, ethanol, methane, ethane, acetaldehyde and carbon dioxide. On this basis, it is shown that under an inert gas atmosphere, ethanol consumption is sub-stoichiometric. This points towards simultaneous ethanol consumption and the formation of the ethanol scavenger. Full article
(This article belongs to the Special Issue Photocatalytic Water Splitting)
Figures

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Modeling the OEC with two new biomimetic models: Preparations, structural characterization and water photolysis studies of a Ba-Mn box type complex and a Mn4N6 planar-diamond cluster
Author: Marcelino Maneiro
Affiliation: Department of Inorganic Chemistry, Faculty of Sciences, University of Santiago de Compostela, Lugo 27002, Spain; Abstract: The Oxygen Evolving Complex (OEC) is the native enzyme that catalyzes the oxidation of water in natural photosynthesis. Two new class of manganese cluster complexes (1-2) of formula Ba2Mn2L12(H3L1)2(CH3OH)2 1 and Mn4L26Cl2 2 have been prepared [H4L1 = N,N’-(ethane-1,2-diyl)bis(2-hydroxybenzamide); L2 = methyl picolinimidate) and characterized by standard techniques including microanalysis, IR and UV spectroscopy, paramagnetic 1H NMR spectroscopy, ESI spectrometry and magnetic susceptibility measurements. X-ray diffraction studies of these complexes revealed: (i) a box-type structure for 1, formed by the two redox-active manganese(III) ions and the two barium(II) ions, and connected by two bridging bisamido-bisphenoxy ligand molecules; (ii) a planar-diamond array for the Mn4N6 cluster 2 where the picolinimidates act as chelating ligands through the two nitrogen atoms. The ability of 1-2 to split water has been studied by water photolysis experiments, with the oxygen evolution measured in aqueous media in the presence of p-benzoquinone (acting as hydrogen acceptor), the reduction of which was followed by UV-spectroscopy. The relevant photolytic activity found for 1 contrasts with the inactivity of 2 in the photolytic experiments, and this different behavior is discussed on basis of the structure of the biomimetic models and the proposed reaction mechanism for this process.

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