Extremely stable bare hematite photoanode for solar water splitting
| Autor: | António Vilanova, Luísa Andrade, Adélio Mendes, Paula Dias, Tânia Lopes |
|---|---|
| Přispěvatelé: | Faculdade de Engenharia |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Thin films Nanotechnology 02 engineering and technology Substrate (electronics) 010402 general chemistry Ciências Tecnológicas 01 natural sciences 7. Clean energy Technological sciences General Materials Science Long-term stability Electrical and Electronic Engineering Thin film Deposition (law) Photocurrent Dopant Renewable Energy Sustainability and the Environment Hematite photoanodes Spray pyrolysis Hematite 021001 nanoscience & nanotechnology Solar fuel 0104 chemical sciences Chemical engineering visual_art visual_art.visual_art_medium 0210 nano-technology Current density Photoelectrochemical water splitting Design of experiments |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2016.03.008 |
| Popis: | Photoelectrodes that are efficient, highly stable, made from low cost materials and easily prepared using inexpensive techniques are required for commercially viable solar photoelectrochemical (PEC) water-splitting technology. Hematite is one of few materials that is being considered for this application. In this work, bare hematite thin films prepared by spray pyrolysis were systematically optimized following a design of experiments approach. A response surface methodology was applied to factors: (i) sprayed volume of solution; (ii) temperature of the glass substrate during the deposition; and (iii) time gap between sprays and the optimized operating conditions obtained were v =42 mL, T =425 °C and t =35 s. The optimized hematite photoelectrode showed a photocurrent density of ca . 0.94 mA cm −2 at 1.45 V RHE , without dopants or co-catalysts, which is remarkable for a thin film of ca . 19 nm. The stability of this photoelectrode was assessed over 1000 h of PEC operation under 1-sun of simulated sunlight. A record-breaking result was obtained with no evidences of hematite film degradation neither of current density loss. These results open the door to turn PEC cells into a competitive technology in the solar fuel economy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect