High performance cork-templated ceria for solar thermochemical hydrogen productionviatwo-step water-splitting cycles
| Autor: | Anita Haeussler, Pedro M. Oliveira e Silva, Ana I. Mouquinho, M. Alexandra Barreiros, Ana P.F. Caetano, Stéphane Abanades, Robert C. Pullar, Fernando A. Costa Oliveira, Rui M. Novais |
|---|---|
| Přispěvatelé: | Procédés, Matériaux et Energie Solaire (PROMES), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen Settore ING-IND/22 - Scienza e Tecnologia dei Materiali Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology [CHIM.INOR]Chemical Sciences/Inorganic chemistry 010402 general chemistry 01 natural sciences 7. Clean energy Redox Solar fuels Reaction rate chemistry.chemical_compound Ceria [CHIM.GENI]Chemical Sciences/Chemical engineering Acetone [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering H 2 O splitting Concentrating solar power Hydrogen production Settore CHIM/03 - Chimica Generale e Inorganica Thermochemical cycle Renewable Energy Sustainability and the Environment Settore CHIM/07 - Fondamenti Chimici delle Tecnologie [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology Solar reactor 0104 chemical sciences Solvent Fuel Technology chemistry Chemical engineering 13. Climate action Water splitting 0210 nano-technology Cork |
| Zdroj: | Sustainable Energy & Fuels Sustainable Energy & Fuels, Royal Society of Chemistry, 2020, 4, pp.3077-3089. ⟨10.1039/D0SE00318B⟩ Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 2398-4902 |
| Popis: | Water splitting by solar energy-driven two-step thermochemical cycles is a promising approach for large-scale production of renewable fuels (e.g. hydrogen). The key challenge is developing materials capable of withstanding the harsh environmental conditions and to ensure high reliability in use, particularly in terms of redox kinetics and better activity at low operation temperatures. In this work, we demonstrate that cork-templated ceria can significantly enhance the hydrogen production performance under solar irradiation heating. Three types of ceria morphologies were synthesised and investigated in two-step thermochemical redox cycles, namely ceria granules (ecoceramics) prepared from cork templates based on either a green water-based or an acetone solvent-based approach, as well as ceria foams replicated from polyurethane templates. These materials were cycled in a high-temperature indirectly-irradiated solar tubular reactor, heated via concentrated solar light, using a temperature-swing process. Samples were typically thermally reduced at 1400-1450 degrees C and subsequently re-oxidised with H2O between 950-1150 degrees C. The green synthesis ceria granules had up to 25% and 32% higher average H-2 production yields than the acetone-based ecoceramics and replicated ceria foams, respectively. On average, H-2 production rates for cork-templated ceria granules (1.3 +/- 0.2 mL min(-1) g(-1)) were up to similar to 60% higher than for ceria foams (0.8 +/- 0.3 mL min(-1) g(-1)), indicating that the morphology of this three-dimensionally ordered macroporous (3-DOM) CeO2 improves the reaction kinetics. This is attributed to the smaller mean cell size of the cork-derived ecoceramic (25 mu m) compared to that of the replicated ceria foam (575 mu m), suggesting that their semi-closed wall cells enhanced reaction rates. The increase in reduction temperature from 1400 to 1450 degrees C resulted in the highest H-2 production rate (1.6 mL min(-1) g(-1)) reported so far for 3-DOM ceria. Neither loss in redox performance nor change in grain morphology was observed from the first to the last cycle. These findings show that cork-like structural features are key to engineering efficient materials for enhanced solar thermochemical fuel production. info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|