Searched for: author%3A%22Smith%2C+W.A.%22
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Trze?niewski, B.J. (author), Smith, W.A. (author)
Bismuth vanadate (BiVO4) is a promising semiconductor material for the production of solar fuels via photoelectrochemical water splitting, however, it suffers from substantial recombination losses that limit its performance to well below its theoretical maximum. Here we demonstrate for the first time that the photoelectrochemical (PEC)...
journal article 2015
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Vermaas, D.A. (author), Sassenburg, M. (author), Smith, W.A. (author)
Different pH requirements for a cathode and an anode result in a non-optimal performance for practical solar fuel systems. We present for the first time a photo-assisted water splitting device using a bipolar membrane, which allows a cathode to operate in an acidic electrolyte while the photoanode is in alkaline conditions. The bipolar membrane...
journal article 2015
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Kumar, N. (author), Abdi, F.F. (author), Trzesniewski, B. (author), Smith, W.A. (author), Planken, P.C.M. (author), Adam, A.J.L. (author)
We demonstrate emission of terahertz pulses from a BiVO4/Au thin film interface, illuminated with femtosecond laser pulses. Based on the experimental observations, we propose that the most likely cause of the THz emission is the Photo-Dember effect caused by the standing wave intensity distribution formed at the BiVO4/Au interfaces.
journal article 2015
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Trzesniewski, B.J. (author), Smith, W.A. (author)
Bismuth vanadate (BiVO4) is a promising semiconductor material for the production of solar fuels via photoelectrochemical water splitting, however, it suffers from substantial recombination losses that limit its performance to well below its theoretical maximum. Here we demonstrate for the first time that the photoelectrochemical (PEC)...
journal article 2016
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Vasudevan, R.A. (author), Thanawala, Zaid (author), Han, L. (author), Tan, H. (author), Buijs, Thom (author), Deligiannis, D. (author), Perez Rodriguez, P. (author), Digdaya, I.A. (author), Smith, W.A. (author), Zeman, M. (author), Smets, A.H.M. (author)
A hybrid tandem solar cell consisting of a thin-film, nanocrystalline silicon top junction and a siliconheterojunction bottom junction is proposed as a supporting solar cell for photoelectrochemical applications.Tunneling recombination junction engineering is shown to be an important consideration indesigning this type of solar cell. The best...
journal article 2016
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Valenti, M. (author), Jonsson, M.P. (author), Biskos, G. (author), Schmidt-Ott, A. (author), Smith, W.A. (author)
Photoelectrochemical (PEC) water splitting is a promising technology that uses light absorbing semiconductors to convert solar energy directly into a chemical fuel (i.e., hydrogen). PEC water splitting has the potential to become a key technology in achieving a sustainable society, if high solar to fuel energy conversion efficiencies are...
journal article 2016
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Perez Rodriguez, P. (author), Digdaya, I.A. (author), Mangel Raventos, A. (author), Falkenberg, M. (author), Vasudevan, R.A. (author), Zeman, M. (author), Smith, W.A. (author), Smets, A.H.M. (author)
One of the main problems of renewable energies is storage of the energy carrier. For long-term storage, solar fuels seem to be a good option. Direct solar water splitting could play an important role in the production of these solar fuels. One of the main challenges of this process is the charge separation and collection at the interfaces. The...
conference paper 2016
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Ma, M. (author), Hansen, Heine A. (author), Valenti, M. (author), Wang, Zegao (author), Cao, A. (author), Dong, Mingdong (author), Smith, W.A. (author)
The electrocatalytic reduction of CO<sub>2</sub> on Au-Pt bimetallic catalysts with different compositions was evaluated, offering a platform for uncovering the correlation between the catalytic activity and the surface composition of bimetallic electrocatalysts. The Au-Pt alloy films were synthesized by a magnetron sputtering co-deposition...
journal article 2017
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Valenti, M. (author), Venugopal, A. (author), Tordera, Daniel (author), Jonsson, P.M. (author), Biskos, G. (author), Schmidt-Ott, A. (author), Smith, W.A. (author)
The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices...
journal article 2017
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Trzesniewski, B.J. (author), Digdaya, I.A. (author), Nagaki, T. (author), Ravishankar, Sandheep (author), Herraiz-Cardona, Isaac (author), Vermaas, D.A. (author), Longo, Alessandro (author), Gimenez, Sixto (author), Smith, W.A. (author)
Bismuth vanadate (BiVO<sub>4</sub>) is one of the most efficient light absorbing metal oxides for solar water splitting. BiVO<sub>4</sub> photoanodes immersed in an electrolyte in an open circuit configuration and exposed to simulated solar illumination for prolonged time achieve superior photoelectrochemical (PEC) activity. This...
journal article 2017
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Digdaya, I.A. (author), Adhyaksa, Gede W.P. (author), Trzesniewski, B.J. (author), Garnett, Erik C. (author), Smith, W.A. (author)
Solar-assisted water splitting can potentially provide an efficient route for large-scale renewable energy conversion and storage. It is essential for such a system to provide a sufficiently high photocurrent and photovoltage to drive the water oxidation reaction. Here we demonstrate a photoanode that is capable of achieving a high...
journal article 2017
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Wedege, Kristina (author), Bae, D. (author), Smith, W.A. (author), Mendes, Adélio (author), Bentien, Anders (author)
In recent years, research in solar energy storage with photoelectrochemical cells (i.e., solar redox flow batteries: SRFBs) has resurged. This development is emerging in parallel with the growing field of research into organic redox couples intended for aqueous redox flow batteries (RFBs) in a range of different pH environments. In a solar...
journal article 2018
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Perez Rodriguez, P. (author), Cardenas-Morcoso, Drialys (author), Digdaya, I.A. (author), Mangel Raventos, A. (author), Procel Moya, P.A. (author), Isabella, O. (author), Gimenez, Sixto (author), Zeman, M. (author), Smith, W.A. (author), Smets, A.H.M. (author)
Amorphous silicon carbide (a-SiC:H) is a promising material for photoelectrochemical water splitting owing to its relatively small band-gap energy and high chemical and optoelectrical stability. This work studies the interplay between charge-carrier separation and collection, and their injection into the electrolyte, when modifying the...
journal article 2018
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Digdaya, I.A. (author), Trzesniewski, B.J. (author), Adhyaksa, Gede W.P. (author), Garnett, E.C. (author), Smith, W.A. (author)
Metal-insulator-semiconductor (MIS) photoelectrodes offer a simple alternative to the traditional semiconductor-liquid junction and the conventional p-n junction electrode. Highly efficient MIS photoanodes require interfacial surface passivating oxides and high workfunction metals to produce a high photovoltage. Herein, we investigate and...
journal article 2018
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Ma, M. (author), Liu, K. (author), Shen, J. (author), Kas, R. (author), Smith, W.A. (author)
In this work, the highly selective and stable electrocatalytic reduction of CO<sub>2</sub> to CO on nanostructured Ag electrocatalysts is presented. The Ag electrocatalysts are synthesized by the electroreduction of Ag<sub>2</sub>CO<sub>3</sub> formed by in situ anodic-etching of Ag foil in a KHCO<sub>3</sub> electrolyte. After 3 min of this...
journal article 2018
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Kas, R. (author), Ayemoba, Onagie (author), Firet, N.J. (author), Middelkoop, J. (author), Smith, W.A. (author), Cuesta, Angel (author)
The field of electrochemical CO<sub>2</sub> conversion is undergoing significant growth in terms of the number of publications and worldwide research groups involved. Despite improvements of the catalytic performance, the complex reaction mechanisms and solution chemistry of CO<sub>2</sub> have resulted in a considerable amount of...
review 2019
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Bae, D. (author), Faasse, Richard (author), Kanellos, Gerasimos (author), Smith, W.A. (author)
In recent years, solar redox flow batteries have attracted attention as a possible integrated technology for simultaneous conversion and storage of solar energy. Unlike solar water splitting technologies which require at least 1.8V for meaningful performance, a lesson learned from previous solar redox flow battery (SRFB) studies is that even...
journal article 2019
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Liu, K. (author), Smith, W.A. (author), Burdyny, Thomas (author)
review 2019
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Bohra, D. (author), Chaudhry, Jehanzeb H. (author), Burdyny, T.E. (author), Pidko, E.A. (author), Smith, W.A. (author)
The environment of a CO2 electroreduction (CO2ER) catalyst is intimately coupled with the surface reaction energetics and is therefore a critical aspect of the overall system performance. The immediate reaction environment of the electrocatalyst constitutes the electrical double layer (EDL) which extends a few nanometers into the electrolyte and...
journal article 2019
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Yang, K. (author), Kas, R. (author), Smith, W.A. (author)
Over the past decade, electrochemical carbon dioxide reduction has become a thriving area of research with the aim of converting electricity to renewable chemicals and fuels. Recent advances through catalyst development have significantly improved selectivity and activity. However, drawing potential dependent structure-activity relationships...
journal article 2019
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