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      Photochemical CO 2 reduction using structurally controlled g-C 3N 4

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          Abstract

          Urea derived g-C 3N 4 is a highly active CO 2 reduction photocatalyst due to the location and driving force of photogenerated charges.

          Abstract

          Graphitic carbon nitride (g-C 3N 4) synthesised from a urea precursor is an excellent CO 2 reduction photocatalyst using [Co(bpy) n] 2+ as a co-catalyst. A five-fold increase in activity for the highly polymerised urea derived g-C 3N 4 is achieved compared to alternative precursors. Transient absorption, time-resolved and steady-state emission studies indicate that the enhanced activity is related to both an increased driving force for photoelectron transfer and a greater availability of photogenerated charges.

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          A metal-free polymeric photocatalyst for hydrogen production from water under visible light.

          Xinchen Wang, Kazuhiko Maeda, Arne Thomas … (2009)
          The production of hydrogen from water using a catalyst and solar energy is an ideal future energy source, independent of fossil reserves. For an economical use of water and solar energy, catalysts that are sufficiently efficient, stable, inexpensive and capable of harvesting light are required. Here, we show that an abundant material, polymeric carbon nitride, can produce hydrogen from water under visible-light irradiation in the presence of a sacrificial donor. Contrary to other conducting polymer semiconductors, carbon nitride is chemically and thermally stable and does not rely on complicated device manufacturing. The results represent an important first step towards photosynthesis in general where artificial conjugated polymer semiconductors can be used as energy transducers.
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            Principles of Fluorescence Spectroscopy

            Joseph R. Lakowicz (2006)
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              Water splitting. Metal-free efficient photocatalyst for stable visible water splitting via a two-electron pathway.

              Juan Liu, Yang Liu, Naiyun Liu … (2015)
              The use of solar energy to produce molecular hydrogen and oxygen (H2 and O2) from overall water splitting is a promising means of renewable energy storage. In the past 40 years, various inorganic and organic systems have been developed as photocatalysts for water splitting driven by visible light. These photocatalysts, however, still suffer from low quantum efficiency and/or poor stability. We report the design and fabrication of a metal-free carbon nanodot-carbon nitride (C3N4) nanocomposite and demonstrate its impressive performance for photocatalytic solar water splitting. We measured quantum efficiencies of 16% for wavelength λ = 420 ± 20 nanometers, 6.29% for λ = 580 ± 15 nanometers, and 4.42% for λ = 600 ± 10 nanometers, and determined an overall solar energy conversion efficiency of 2.0%. The catalyst comprises low-cost, Earth-abundant, environmentally friendly materials and shows excellent stability.
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                Author and article information

                Journal
                Journal ID (publisher-id): PPCPFQ
                Title: Physical Chemistry Chemical Physics
                Abbreviated Title: Phys. Chem. Chem. Phys.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1463-9076
                ISSN (Electronic): 1463-9084
                Publication date Created: 2016
                Publication date (Electronic): 2016
                Volume: 18
                Issue: 36
                Pages: 24825-24829
                Affiliations
                [1 ]Stephenson Institute for Renewable Energy
                [2 ]University of Liverpool
                [3 ]Liverpool
                [4 ]UK
                [5 ]Solar Energy Group
                [6 ]Department of Chemical Engineering
                [7 ]University College London
                [8 ]London
                Article
                DOI: 10.1039/C6CP04525A
                PubMed ID: 27711464
                SO-VID: 14549522-c977-4c15-9a45-4bf40e89b42e
                Copyright © © 2016
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