Solar water splitting under natural concentrated sunlight using a 200 cm2 photoelectrochemical-photovoltaic device
| Autor: | João Lúcio de Azevedo, Paula Dias, Tânia Lopes, Adélio Mendes, Michael Wullenkord, António Vilanova, Carsten Spenke |
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| Přispěvatelé: | Faculdade de Engenharia |
| Rok vydání: | 2020 |
| Předmět: |
Engenharia química
Engenharia química Materials science Continuous operation Chemical engineering [Engineering and technology] Energy Engineering and Power Technology Solar concentrator 02 engineering and technology Solar water splitting 010402 general chemistry 7. Clean energy 01 natural sciences Engenharia química [Ciências da engenharia e tecnologias] Electrical and Electronic Engineering Physical and Theoretical Chemistry Photoelectrochemical cell Hydrogen production Photocurrent Electrolysis of water Renewable Energy Sustainability and the Environment business.industry Photovoltaic system 021001 nanoscience & nanotechnology Chemical engineering Chemical engineering 0104 chemical sciences Large-area device Hematite photoelectrode Optoelectronics 0210 nano-technology business Current density Dark current |
| Zdroj: | Journal of Power Sources. 454:227890 |
| ISSN: | 0378-7753 |
| Popis: | This work reports a 200 cm2 PEC-PV device that comprises four 50 cm2 PEC cells coupled in a modular array and optimized for continuous operation under concentrated sunlight. The developed module is the second largest PEC-PV device ever reported and the first tested under natural concentrated sunlight (up to 12.8 kW m−2). Demonstration tests were conducted outdoor in a continuous operation mode, over four days and using highly stable hematite photoelectrodes. When assembled with four multi-PE windows, each comprising eight small nanostructured photoelectrodes connected in parallel, the module generated a stable current density of ca. 2.0 mA cm−2 at 1.45 V, resulting in an average hydrogen production rate of 5.6 × 10−5 gH2 h−1 cm−2 (based on the net active area). A maximum current density of ca. 4.0 mA cm−2 was reached during J-V measurements (before the dark current onset potential). It was observed that when hematite photoelectrodes are subjected to gradually higher solar irradiances the generated photocurrent follows a logarithmic saturation behaviour. This work provides important insights for demonstrating the viability of solar-driven water electrolysis by presenting a PEC-PV device that answers to the main challenges of large-scale photoelectrochemical hydrogen production. |
| Databáze: | OpenAIRE |
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