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Showing 1 to 20 of 27 for “"Photoanode"”.
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Iron-oxide catalyzed silicon photoanode for water splitting
… presents an integrated study of high efficiency photoanodes for water splitting using silicon and iron-oxide. The fundamental limitations of silicon to water splitting applications were overcome by an ultrathin iron-oxide film stack and a pH-adjusted electrochemical environment. It was …
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Photoanode and counter electrode modification for more efficient dye sensitized solar cells
… shells on VACNF arrays as potential photoanodes in the DSSC system in order to improve the electron transfer. Fabrication processes were demonstrated and preliminary materials were characterized with scanning electron microscopy and transmission electron microscopy. MOCVD at 300 mTorr …
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Atomic layer deposition and electrochemical characterization of TiO2 as a potential candidate for a photoanode protective layer
… evolution catalyst. The longevity of these photoanodes was the main focus of this work employing the techniques of cyclic voltammetry and chronoamperometry to evaluate electrochemical performance. Electron microscopy SEM was carried out, before and after the anodes underwent electrochemical …
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Investigation of dye-sensitized solar cell performance with single chirality semiconducting carbon nanotubes
… nanotubes (SWNTs) of a single chirality in the photoanode were investigated. Single-chirality carbon nanotubes (CNTs) allow a selection of band-gap and electron mobility. Separating a specific chirality from a mixture of carbon nanotubes remains challenging task. Among separation techniques, one …
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Immobilising and Interfacing Poly(Heptazine Imide) Ionic Carbon Nitride for Photo(electro)catalytic Fuel and Chemical Production
… to synthesise highly performant carbon nitride photoanodes, which can be interfaced with metal- and enzyme-based catalysts for CO2-reduction and hydrogen production with record photocurrents and stabilities. State-of-the-art cyanamide-functionalised poly(heptazine imide) (PHI) ionic carbon …
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H-BN integration in III-nitride devices for green hydrogen applications
… first, a study of InGaN multiple quantum well photoanodes grown on hBN/sapphire to generate hydrogen via PEC water splitting, revealing the effect of h-BN on surface morphology and charge transfer kinetics. Second, the efficiency of a nanostructured InGaN photoanode in terms of hydrogen …
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Photoelectrochemical fuel synthesis using organic semiconductors with (bio)molecular catalysts
… by assembling the photobiocathode with a BiVO4 photoanode in an artificial leaf device for unassisted CO2 reduction coupled to O2 evolution, attaining a faradaic yield (FY) of 87% over 24 h of operation. Extending beyond the O2 evolution reaction, an organic–inorganic PEC tandem device was …
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Advanced photoanodes for photoassisted water electrolysis
… [alpha]-Fe₂O₃ has emerged as a highly promising photoanode candidate for photoelectrochemical cells. While significant improvements in its performance have recently been achieved, it remains unclear why the maximum photocurrents still remain well below their theoretical predictions. This study …
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Solar Water Oxidation by Composite Cobalt-Based Catalyst/Oxide Semiconductor Photoanodes
… rise to slow water oxidation kinetics at the photoanode surfaces relative to competitive loss processes. Inspired by nature's photosynthesis, where the tasks of photon absorption, charge separation, and water-oxidation catalysis are performed by separate protein components, division-of-labor …
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Investigating the Electron Transport and Light Scattering Enhancement in Radial Core-Shell Metal-Metal Oxide Novel 3D Nanoarchitectures for Dye Sensitized Solar Cells
… (D<sub>n</sub>) in this mesoporous film photoanode. This work focuses on the influence of the advanced core-shell nanoarchitecture geometry on electron transport and also on the influence of electron-ion interactions. In order to achieve the proposed goals, DSSCs based on ordered, highly …
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The Role of Charge Transfer Induced Spin Crossover Complexes on Charge-Separated State Lifetime in Photoelectrochemical Devices
… lifetimes in the dye-sensitized photoanode constructs. Mn(pzb)2 undergoes a spin transition from a high-spin, sextet state for Mn(II), to a low-spin, triplet state for Mn(III). The spin change is induced upon a pseudo-octahedral-to-octahedral structural change that modifies the …
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Development of Reactor Technology for the Photoelectrolysis of Seawater
… manner.<br/><br/>TiO2 materials such as sol-gel photoanodes and titania nanotubes have been shown as immobilised photocatalysts capable of chloride oxidation with the latter exhibiting higher faradaic efficiencies of ~ 60 % under UV illumination. A propeller reactor system has been developed for …
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Photoelectrochemical tandem cells with enzymes wired to hierarchically-structured electrodes for solar fuel synthesis
… diketopyrrolopyrrole dye-sensitised TiO2 photoanode enabling complementary panchromatic solar light absorption. Effective electronic communication at the enzyme−material interface was engineered using an Os complex-modified polymer on a hierarchically-structured IO-TiO2. Finally, a …
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Nanostructured nitrogen and carbon codoped TiO2 thin films: synthesis, structural characterization and optoelectronic properties
… of nitrogen and carbon (N-C) codoped TiO 2 photoanode material that could potentially be used in photoelectrochemical cells for hydrogen generation. The solar spectrum peaks around 500 nm (2.48 eV) which is in the visible part of the spectrum. The photoanode material to be used for solar …
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Enhancing the photoelectrochemical water splitting characteristics of titanium and tungsten oxide based materials via doping and sensitization
… by the properties of the materials employed as photoanodes. Improving the power-conversion efficiency of PEC water splitting requires the design of inexpensive and efficient photoanodes that have strong visible light absorption, fast charge separation, and lower charge recombination rate. In the …
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Investigation of layer-by-layer assembly and M13 bacteriophage nanowires for dye-sensitized solar cells
… a template for the construction of the titania photoanode of dye sensitized solar cells (DSSCs) with a novel nanowire architecture to enhance electron transport. The biotemplated nanowires are shown to significantly increase device electron diffusion length and increase device efficiency as …
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Photocatalytic Degradation of Perfluorooctanoic Acid in Water by Free and Immobilised ZnO, g-C3N4 and Their Composite under UV and Visible Light Irradiation
… The optimal ZnO coating was also used as the photoanode for the degradation of PFOA using photoelectrocatalysis (at V = 0) where the apparent rate constant of 0.331 h⁻¹ was obtained under UV irradiation and ~53 mg/L PFOA concentration. Citric acid was effectively used to modify g-C₃N₄ with …
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Studies of interaction of dye molecules with TiO2 Brookite clusters for application in dye sensitized solar cells
… to conventional silicon based solar cells. The photoanode of DSSCs comprises of dye molecules anchored to the surface of semiconductors such as TiO2. However, the major drawback of Titanium dioxide (TiO2) is its wide band gap (3.0 eV to 3.2 eV) which limits its photocatalytic activities to the …
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Integrating photosystem II and electroactive bacteria with three-dimensional electrodes for semi-artificial photosynthesis
… external circuit or ultimately outsourced to a photoanode. Chapter 7 summarises the key findings in this thesis and blueprints future directions of research in this field. The research represents an interdisciplinary approach that takes advantages of biocatalysis featuring high selectivity and …
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Tailored diketopyrrolopyrrole-based organic dyes in photoelectrochemical cells for solar fuel synthesis
… systems for the assembly of water-oxidising photoanodes. As an alternative to O₂ evolution, DPP chromophores with different anchoring groups were synthesised and co-immobilised with an organic nitroxyl radical catalyst on a mesoporous TiO₂ scaffold for light-driven alcohol oxidation. The …
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