Toward a Low-Cost Artificial Leaf: Driving Carbon-Based and Bifunctional Catalyst Electrodes with Solution-Processed Perovskite Photovoltaics
2016 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 6, no 20, 1-10 p., 1600738Article in journal (Refereed) Published
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
artificial-leaf devices, bifunctional electrocatalyst, carbon paper, nitrogen-doped carbon nanotubes, perovskite photovoltaics
IdentifiersURN: urn:nbn:se:umu:diva-128457DOI: 10.1002/aenm.201600738ISI: 000387136300001OAI: oai:DiVA.org:umu-128457DiVA: diva2:1063970