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High performance cork-templated ceria for solar thermochemical hydrogen production via two-step water-splitting cycles

2020Journal article Open access
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dc.contributor.authorOliveira, Fernando Almeida Costa
dc.contributor.authorBarreiros, M. Alexandra
dc.contributor.authorHaeussler, Anita
dc.contributor.authorCaetano, Ana P. F.
dc.contributor.authorMouquinho, Ana
dc.contributor.authorSilva, P. Oliveira e
dc.contributor.authorNovais, Rui M.
dc.contributor.authorPullar, Robert C.
dc.contributor.authorAbanades, Stéphane
dc.date.accessioned2020-09-24T09:34:30Z
dc.date.available2024-12-01T01:30:43Z
dc.date.issued2020
dc.description.abstractABSTRACT: 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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationOliveira, Fernando A. Costa... [et.al.] - High performance cork-templated ceria for solar thermochemical hydrogen production via two-step water-splitting cycles. In: Sustainable Energy & Fuels, 2020, Vol. 4 (6), p. 3077-3089pt_PT
dc.identifier.doi10.1039/d0se00318bpt_PT
dc.identifier.issn2398-4902
dc.identifier.urihttp://hdl.handle.net/10400.9/3317
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherRoyal Society of Chemistrypt_PT
dc.relationFCT - PTDC/CTM ENE/6762/2014pt_PT
dc.relationFCT - POCI-01-0145-FEDER 016862pt_PT
dc.relationFCT - CEECIND/00335/2017pt_PT
dc.relationFCT - IF/00681/2015pt_PT
dc.relationFCT - UIDB/50011/2020pt_PT
dc.relationFCT - UIDP/50011/2020pt_PT
dc.relationALT20-03-0145-FEDER-022113pt_PT
dc.relation.publisherversionhttps://doi.org/10.1039/d0se00318bpt_PT
dc.subjectHydrogen productionpt_PT
dc.subjectSolar fuelspt_PT
dc.subjectThermochemical cyclept_PT
dc.subjectConcentrated solar powerpt_PT
dc.subjectCorkpt_PT
dc.titleHigh performance cork-templated ceria for solar thermochemical hydrogen production via two-step water-splitting cyclespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage3089pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage3077pt_PT
oaire.citation.titleSustainable Energy and Fuelspt_PT
oaire.citation.volume4pt_PT
person.familyNameOliveira
person.familyNameBarreiros
person.familyNameMouquinho
person.givenNameFernando
person.givenNameMaria Alexandra
person.givenNameAna
person.identifier647144
person.identifierL-4674-2014
person.identifier.ciencia-id561B-597F-9D55
person.identifier.ciencia-id271D-7B29-E46C
person.identifier.ciencia-id6614-5797-6DF1
person.identifier.orcid0000-0002-1503-0152
person.identifier.orcid0000-0002-0132-4969
person.identifier.orcid0000-0002-2723-9973
person.identifier.ridA-2312-2011
person.identifier.scopus-author-id23019925500
person.identifier.scopus-author-id6603680496
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication2c841cae-13ca-44f6-8cb1-b5ce93608bae
relation.isAuthorOfPublication3b1e7d6a-3232-443e-a747-f442427dc57a
relation.isAuthorOfPublication73e67d2e-fa32-4b3b-8044-619a4af57a30
relation.isAuthorOfPublication.latestForDiscovery2c841cae-13ca-44f6-8cb1-b5ce93608bae

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