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Toward a Low-Cost Artificial Leaf: Driving Carbon-Based and Bifunctional Catalyst Electrodes with Solution-Processed Perovskite Photovoltaics
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2016 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 6, no 20, 1-10 p., 1600738Article in journal (Refereed) Published
Abstract [en]

Molecular hydrogen can be generated renewably by water splitting with an artificial-leaf device, which essentially comprises two electrocatalyst electrodes immersed in water and powered by photovoltaics. Ideally, this device should operate efficiently and be fabricated with cost-efficient means using earth-abundant materials. Here, a lightweight electrocatalyst electrode, comprising large surface-area NiCo2O4 nanorods that are firmly anchored onto a carbon-paper current collector via a dense network of nitrogen-doped carbon nanotubes is presented. This electrocatalyst electrode is bifunctional in that it can efficiently operate as both anode and cathode in the same alkaline solution, as quantified by a delivered current density of 10 mA cm(-2) at an overpotential of 400 mV for each of the oxygen and hydrogen evolution reactions. By driving two such identical electrodes with a solution-processed thin-film perovskite photovoltaic assembly, a wired artificial-leaf device is obtained that features a Faradaic H-2 evolution efficiency of 100%, and a solar-to-hydrogen conversion efficiency of 6.2%. A detailed cost analysis is presented, which implies that the material-payback time of this device is of the order of 100 days.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016. Vol. 6, no 20, 1-10 p., 1600738
Keyword [en]
artificial-leaf devices, bifunctional electrocatalyst, carbon paper, nitrogen-doped carbon nanotubes, perovskite photovoltaics
National Category
Physical Chemistry
URN: urn:nbn:se:umu:diva-128457DOI: 10.1002/aenm.201600738ISI: 000387136300001OAI: diva2:1063970
Available from: 2017-01-11 Created: 2016-12-05 Last updated: 2017-01-11Bibliographically approved

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Sharifi, TivaLarsen, ChristianWang, JiaKwong, Wai LingGracia-Espino, EduardoMercier, GuillaumeMessinger, JohannesWågberg, ThomasEdman, Ludvig
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Department of PhysicsDepartment of Chemistry
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