Search results for " OER"

showing 3 items of 3 documents

Nanostructured Ni–Co alloy electrodes for both hydrogen and oxygen evolution reaction in alkaline electrolyzer

2021

Abstract Ni–Co alloy nanostructured electrodes with high surface area were investigated both as a cathode and anode for an alkaline electrolyzer. Electrodes were obtained by template electrosynthesis at room temperature. The electrolyte composition was tuned in order to obtain different NiCo alloys. The chemical and morphological features of nanostructured electrodes were evaluated by EDS, XRD and SEM analyses. Results show that electrodes with different composition of Ni and Co, made of nanowires well anchored to the substrate, were obtained. For both hydrogen and oxygen evolution reactions, electrochemical and electrocatalytic tests, performed in 30% w/w KOH aqueous solution, were carried…

Materials scienceHydrogenEnergy Engineering and Power Technologychemistry.chemical_element02 engineering and technology010402 general chemistryElectrosynthesisElectrochemistry01 natural sciencesSettore ING-INF/01 - Elettronicalaw.inventionlawSettore ING-IND/17 - Impianti Industriali MeccaniciTafel equationElectrolysisRenewable Energy Sustainability and the EnvironmentAlkaline water electrolysisOxygen evolution021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesAnodeFuel TechnologySettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringchemistry0210 nano-technologyAlkaline electrolyzer HER Nanostructured electrodes Ni–Co Alloy OER Template electrosynthesis
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Ni-Fe alloy nanostructured electrodes for water splitting in alkaline electrolyser

2021

Abstract In this work, nickel-iron alloy nanostructured electrodes obtained by template electrosynthesis method are investigated for both hydrogen and oxygen evolution reactions. Electrodes consist of nanowire arrays with high surface area that are able to ensures a high electrolytic activity. To obtain different alloy compositions, the concentration of the elements in the deposition baths is appropriately tuned. Results show that the composition of nanowires does not change linearly with the composition of deposition bath but are richer in Fe. Nanostructured electrodes are tested as both cathodes and anodes in 30 wt% KOH aqueous solution, at room temperature to determine the best alloy com…

Tafel equationMaterials scienceAqueous solutionGeneral Chemical EngineeringAlloyOxygen evolution02 engineering and technologyElectrolyteengineering.material010402 general chemistry021001 nanoscience & nanotechnologyElectrosynthesisElectrochemistry01 natural sciences0104 chemical sciencesSettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringSettore ING-IND/17 - Impianti Industriali MeccaniciElectrochemistryengineeringWater splitting0210 nano-technologyAlkaline electrolyzer HER Nanostructured electrodes Ni-Fe Alloy OER Template electrosynthesis
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DESIGN PRINCIPLES OF COLLABORATIVE LEARNING SPACE CONNECTING TEACHERS AND REFUGEE CHILDREN - A DESIGN SCIENCE RESEARCH STUDY

2020

Learning the German language is one of the most critical challenges for refugee children in Germany. It is a prerequisite to allow communication and integration into the educational system. To solve the underlying problem, we conceptualized a set of principles for the design of language learning systems to support collaboration between teachers and refugee children, using a Design Science Research approach. The proposed design principles offer functional and non-functional requirements of systems, including the integration of open educational resources, different media types to develop visual and audio narratives that can be linked to the cultural and social background. This study also illu…

learning technologyoppimisympäristöoppiminenkotoutuminen (maahanmuuttajat)Refugeestorytelling for kidsDesign elements and principleslapset (ikäryhmät)Collaborative learningoppimisalustatSpace (commercial competition)collaborative OERmaahanmuuttajatavoimet oppimateriaalitintergenerational learningsaksan kieliMathematics educationchildren refugeeopetusteknologiaDesign science researchSociologykielen oppiminenpakolaisetoppimateriaaliEDULEARN Proceedings
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