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Kevin Sivula - One of the best experts on this subject based on the ideXlab platform.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm–2 is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with th...
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A Bismuth Vanadate–Cuprous Oxide Tandem Cell for Overall Solar Water Splitting
The Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, B Dam, Roel Van De Krol, Michael Graetzel, S. David Tilley, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
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Solar-to-Chemical Energy Conversion with Photoelectrochemical Tandem Cells.
Chimia, 2013Co-Authors: Kevin SivulaAbstract:Efficiently and inexpensively converting solar energy into chemical fuels is an important goal towards a sustainable energy economy. An integrated Tandem Cell approach could reasonably convert over 20% of the sun's energy directly into chemical fuels like H2 via water splitting. Many different systems have been investigated using various combinations of photovoltaic Cells and photoelectrodes, but in order to be economically competitive with the production of H2 from fossil fuels, a practical water splitting Tandem Cell must optimize cost, longevity and performance. In this short review, the practical aspects of solar fuel production are considered from the perspective of a semiconductor-based Tandem Cell and the latest advances with a very promising technology - metal oxide photoelectrochemical Tandem Cells - are presented.
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highly efficient water splitting by a dual absorber Tandem Cell
Nature Photonics, 2012Co-Authors: Jeremie Brillet, Michael Graetzel, Junho Yum, Maurin Cornuz, Takashi Hisatomi, Renata Solarska, Jan Augustynski, Kevin SivulaAbstract:A photoelectrochemical Cell made from combining a dye sensitized solar Cell with a semiconductor-oxide photoanode is demonstrated to perform water splitting with an efficiency of up to 3.1%. As the scheme uses relatively inexpensive materials and fabrication techniques it could provide a cost effective approach to hydrogen production.
Pauline Bornoz - One of the best experts on this subject based on the ideXlab platform.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm–2 is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with th...
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A Bismuth Vanadate–Cuprous Oxide Tandem Cell for Overall Solar Water Splitting
The Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, B Dam, Roel Van De Krol, Michael Graetzel, S. David Tilley, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
Jong Hyeok Park - One of the best experts on this subject based on the ideXlab platform.
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unassisted photoelectrochemical water splitting exceeding 7 solar to hydrogen conversion efficiency using photon recycling
Nature Communications, 2016Co-Authors: Xinjian Shi, Hokyeong Jeong, Kan Zhang, Jeong Kwon, In Taek Choi, Il Yong Choi, Hwan Kyu Kim, Jong Kyu Kim, Jong Hyeok ParkAbstract:Various Tandem Cell configurations have been reported for highly efficient and spontaneous hydrogen production from photoelectrochemical solar water splitting. However, there is a contradiction between two main requirements of a front photoelectrode in a Tandem Cell configuration, namely, high transparency and high photocurrent density. Here we demonstrate a simple yet highly effective method to overcome this contradiction by incorporating a hybrid conductive distributed Bragg reflector on the back side of the transparent conducting substrate for the front photoelectrochemical electrode, which functions as both an optical filter and a conductive counter-electrode of the rear dye-sensitized solar Cell. The hybrid conductive distributed Bragg reflectors were designed to be transparent to the long-wavelength part of the incident solar spectrum (λ>500 nm) for the rear solar Cell, while reflecting the short-wavelength photons (λ<500 nm) which can then be absorbed by the front photoelectrochemical electrode for enhanced photocurrent generation.
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synthesis of transparent mesoporous tungsten trioxide films with enhanced photoelectrochemical response application to unassisted solar water splitting
Energy and Environmental Science, 2011Co-Authors: Jung Kyu Kim, Kahee Shin, Sung Min Cho, Taewoo Lee, Jong Hyeok ParkAbstract:Tungsten trioxide (WO3) films with a mesoporous morphology, high transparency, and monoclinic phase crystallinity were prepared using polyethyleneglycol (PEG) as a surfactant and their photoelectrochemical properties were measured. By controlling the weight ratio of the tungsten precursor to PEG, a sphere-like WO3 nanoparticle film with high transparency can be synthesized. The photocurrent responses of the films under 1 sun solar light illumination were measured. Due to the high transparency of the WO3 photoanode, it is possible to fabricate a Tandem Cell composed of a WO3/Pt bipolar electrode connected with a dye-sensitized solar Cell. Unassisted water splitting from the Tandem Cell was demonstrated but the maximum current density was exhibited at around +0.4 V (vs.Pt).
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Photoelectrochemical Tandem Cell with Bipolar Dye-Sensitized Electrodes for Vectorial Electron Transfer for Water Splitting
Electrochemical and Solid-State Letters, 2006Co-Authors: Jong Hyeok Park, Allen J. BardAbstract:Direct water electrolysis was achieved with a novel monolithic photoelectrochemical Cell. Bipolar WO 3 /Pt and dye-sensitized TiO 2 /Pt semiconductor panels, capable of vectorial electron transfer, have been used for water splitting to yield hydrogen and oxygen; light is the only energy input. The hydrogen production efficiency of this Tandem Cell, based on the short-circuit current, was ∼1.9% and the maximum hydrogen production efficiency was ∼2.5% when 0.2 V positive bias was applied. When a concentrated LiCI aqueous solution was used as an electrolyte, valuable chlorine was obtained instead of oxygen. The maximum yielding efficiency of hydrogen and chlorine was ∼1.8%.
Michael Graetzel - One of the best experts on this subject based on the ideXlab platform.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm–2 is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with th...
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A Bismuth Vanadate–Cuprous Oxide Tandem Cell for Overall Solar Water Splitting
The Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, B Dam, Roel Van De Krol, Michael Graetzel, S. David Tilley, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
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highly efficient water splitting by a dual absorber Tandem Cell
Nature Photonics, 2012Co-Authors: Jeremie Brillet, Michael Graetzel, Junho Yum, Maurin Cornuz, Takashi Hisatomi, Renata Solarska, Jan Augustynski, Kevin SivulaAbstract:A photoelectrochemical Cell made from combining a dye sensitized solar Cell with a semiconductor-oxide photoanode is demonstrated to perform water splitting with an efficiency of up to 3.1%. As the scheme uses relatively inexpensive materials and fabrication techniques it could provide a cost effective approach to hydrogen production.
David S Tilley - One of the best experts on this subject based on the ideXlab platform.
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transparent cuprous oxide photocathode enabling a stacked Tandem Cell for unbiased water splitting
Advanced Energy Materials, 2015Co-Authors: Paula Dias, Michael Gratzel, David S Tilley, Anders Hagfeldt, Marcel Schreier, Jingshan Luo, Joao Lucio De Azevedo, Luisa Andrade, Adelio Mendes, Matthew T MayerAbstract:Photoelectrochemical water splitting represents an attractive method of capturing and storing the immense energy of sunlight in the form of hydrogen, a clean chemical fuel. Given the large energetic demand of water electrolysis, and the defined spectrum of photons available from incident sunlight, a two absorber Tandem device is required to achieve high efficiencies. The two absorbers should be of different and complementary bandgaps, connected in series to achieve the necessary voltage, and arranged in an optical stack configuration to maximize the utilization of sunlight. This latter requirement demands a top device that is responsive to high-energy photons but also transparent to lower-energy photons, which pass through to illuminate the bottom absorber. Here, cuprous oxide (Cu2O) is employed as a top absorber component, and the factors influencing the balance between transparency and efficiency toward operation in a Tandem configuration are studied. Photocathodes based on Cu2O electrodeposited onto conducting glass substrates treated with thin, discontinuous layers of gold achieve reasonable sub-bandgap transmittance while retaining performances comparable to their opaque counterparts. This new high-performance transparent photocathode is demonstrated in Tandem with a hybrid perovskite photovoltaic Cell, resulting in a full device capable of standalone sunlight-driven water splitting.
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm–2 is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with th...
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a bismuth vanadate cuprous oxide Tandem Cell for overall solar water splitting
Journal of Physical Chemistry C, 2014Co-Authors: Pauline Bornoz, Fatwa F Abdi, David S Tilley, B Dam, Roel Van De Krol, Michael Graetzel, Kevin SivulaAbstract:Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode Tandem Cell for overall unassisted solar water splitting. Using state-of-the-art photoelectrodes we identify current-matching conditions by altering the photoanode active layer thickness. By further employing water oxidation and reduction catalysts (Co-Pi and RuOx, respectively) together with an operating point analysis, we show that an unassisted solar photocurrent density on the order of 1 mA cm(-2) is possible in a Tandem Cell and moreover gain insight into routes for improvement. Finally, we demonstrate the unassisted 2-electrode operation of the Tandem Cell. Photocurrents corresponding to ca. 0.5% solar-to-hydrogen conversion efficiency were found to decay over the course of minutes because of the detachment of the Co-Pi catalyst. This aspect provides a fundamental challenge to the stable operation of the Tandem Cell with the currently employed catalysts.
