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Inorganic metal oxide nanocrystal photocatalysts for solar fuel generation from water

Troy Townsend's thesis explores the structure, energetics and activity of three inorganic nanocrystal photocatalysts. The goal of this work is to investigate the potential of metal oxide nanocrystals for application in photocatalytic water splitting, which could one day provide us with clean hydrogen fuel derived from water and solar energy. Specifically, Townsend's work addresses the effects of co-catalyst addition to niobium oxide nanotubes for photocatalytic water reduction to hydrogen, and the first use of iron oxide 'rust' in nanocrystal suspensions for oxygen production. In addition, Townsend studies a nickel/oxide-strontium titanate nanocomposite which can be described as one of only four nanoscale water splitting photocatalysts. He also examines the charge transport for this system. Overall, this collection of studies brings relevance to the design of inorganic nanomaterials for photocatalytic water splitting while introducing new directions for solar energy conversion.

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  • "Troy Townsend's thesis explores the structure, energetics and activity of three inorganic nanocrystal photocatalysts. The goal of this work is to investigate the potential of metal oxide nanocrystals for application in photocatalytic water splitting, which could one day provide us with clean hydrogen fuel derived from water and solar energy. Specifically, Townsend's work addresses the effects of co-catalyst addition to niobium oxide nanotubes for photocatalytic water reduction to hydrogen, and the first use of iron oxide 'rust' in nanocrystal suspensions for oxygen production. In addition, Townsend studies a nickel/oxide-strontium titanate nanocomposite which can be described as one of only four nanoscale water splitting photocatalysts. He also examines the charge transport for this system. Overall, this collection of studies brings relevance to the design of inorganic nanomaterials for photocatalytic water splitting while introducing new directions for solar energy conversion."
  • "Troy Townsend's thesis explores the structure, energetics and activity of three inorganic nanocrystal photocatalysts. The goal of this work is to investigate the potential of metal oxide nanocrystals for application in photocatalytic water splitting, which could one day provide us with clean hydrogen fuel derived from water and solar energy. Specifically, Townsend's work addresses the effects of co-catalyst addition to niobium oxide nanotubes for photocatalytic water reduction to hydrogen, and the first use of iron oxide 'rust' in nanocrystal suspensions for oxygen production. In addition, Townsend studies a nickel/oxide-strontium titanate nanocomposite which can be described as one of only four nanoscale water splitting photocatalysts. He also examines the charge transport for this system. Overall, this collection of studies brings relevance to the design of inorganic nanomaterials for photocatalytic water splitting while introducing new directions for solar energy conversion."@en
  • "Realizing a method for converting sunlight to renewable fuel may be one of the most important challenges of the century. Water splitting to hydrogen and oxygen gaseous fuels can be powered by the sun using light absorbing catalysts. In the pursuit of cheap, active, and stable catalysts, this dissertation focuses on inorganic metal oxide semiconductor nanocrystals for solar water splitting including their synthesis, characterization and reactivity. The results from this collection of investigations have shed light on the properties of nanomaterials and their light-driven water reduction and oxidation reactions. Chapter 2 shows the effect of cocatalyst deposition onto wide band gap UV-absorbing asymmetric nanoscale niobium oxide crystals. With spatial charge separation in mind, platinum (an electron acceptor and water reducer) and iridium dioxide (a hole scavenger and known water oxidizer) were photodeposited onto H₄Nb₆O₁₇ crystals to achieve complete water reduction and incomplete water oxidation. In this case, the water oxidation reaction was shown to be confined to a surface-bound peroxide intermediate. Chapter 3 transitions into narrow band gap visible light absorbing Fe₂O₃ nanocrystal water oxidation catalysts. These materials were synthesized, characterized, visualized with high resolution transmission electron microscopy (HRTEM) and tested for their photocatalytic activity under visible light irradiation while in the presence of aqueous AgNO₃, a sacrificial reagent. Chapter 4 describes efforts to advance toward a complete nanoscale water splitting catalyst without reliance on sacrificial reagents. In this case, both half reactions proceed and hydrogen and oxygen are evolved from the solution. Nanoscale SrTiO₃ (6.5 nm and 30 nm) was loaded with NiOx and properties were compared with bulk SrTiO₃ to elucidate the effects of nanoscaling. Chapter 5 outlines the photogenerated electron/hole pathway in NiOx-STO by specifically loading nickel oxide and/or nickel metal cocatalysts onto bulk SrTiO₃ crystals. These materials were tested for water splitting from pure water, and surface photovoltage / electrochemical measurements showed evidence of electron trapping in nickel and hole trapping in nickel oxide, giving rise to a three-component complete water splitter."@en
  • "Troy Townsend's thesis explores the structure, energetics and activity of three inorganic nanocrystal photocatalysts. The goal of this work is to investigate the potential of metal oxide nanocrystals for application in photocatalytic water splitting, which could one day provide us with clean hydrogen fuel derived from water and solar energy. Specifically, Townsend's work addresses the effects of co-catalyst addition to niobium oxide nanotubes for photocatalytic water reduction to hydrogen, and the first use of iron oxide 'rust' in nanocrystal suspensions for oxygen production. In addition, Tow."@en

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  • "Dissertations, Academic"@en
  • "Electronic books"@en

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  • "Inorganic metal oxide nanocrystal photocatalysts for solar fuel generation from water"@en
  • "Inorganic Metal Oxide Nanocrystal Photocatalysts for Solar Fuel Generation from Water"
  • "Inorganic Metal Oxide Nanocrystal Photocatalysts for Solar Fuel Generation from Water"@en
  • "Inorganic metal oxide nanocrystal photocatalysts for solar fuel generation"@en

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