Synthesis, Experimental, and Theoretical Study of Co 3- x Ni x O 4 Mixed Oxides: Potential Candidates for Hydrogen Production via Solar Redox Cycles.

Autor: Nassereddine Y; Laboratory of Inorganic Materials for Sustainable Energy Technology (LIMSET), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, 43150, Benguerir, Morocco., Ait Ousaleh H; Laboratory of Inorganic Materials for Sustainable Energy Technology (LIMSET), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, 43150, Benguerir, Morocco., Filali Baba Y; Laboratory of Inorganic Materials for Sustainable Energy Technology (LIMSET), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, 43150, Benguerir, Morocco., Elharrak A; Laboratory of Inorganic Materials for Sustainable Energy Technology (LIMSET), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, 43150, Benguerir, Morocco., Rachidi S; Research Institute for Solar Energy and New Energies (IRESEN), Green Energy Park (GEP), R206Ben Guerir, Morocco., Faik A; Laboratory of Inorganic Materials for Sustainable Energy Technology (LIMSET), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, 43150, Benguerir, Morocco.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2022 Dec 27; Vol. 8 (1), pp. 324-332. Date of Electronic Publication: 2022 Dec 27 (Print Publication: 2023).
DOI: 10.1021/acsomega.2c04527
Abstrakt: Recently, green hydrogen production via solar thermochemical water splitting (STWS) as a clean and sustainable method is becoming a subject of interest to many researchers. Great efforts are being made to develop materials for STWS with suitable operating conditions, low cost, and good cycling stability. In this context, the study of mixed cobalt and nickel oxides with the general formula Co 3- x Ni x O 4 (0 ≤ x ≤ 1) was carried out, where four mixed metal oxides Co 2.75 Ni 0.25 O 4 , Co 2.5 Ni 0.5 O 4 , Co 2.25 Ni 0.75 O 4 , and Co 2 NiO 4 have been successfully synthesized through the sol-gel method modified Pechini route. The structural investigation demonstrated that pure spinel structures were obtained for 0 ≤ x ≤ 0.75. A deep study was carried out with the main goal of finding the best phase that provides low redox temperature. Interesting reduction temperatures for all the compositions have been found, and the lowest values of 675 and 710 °C have been reported for Co 2.25 Ni 0.75 O 4 and Co 2.5 Ni 0.5 O 4 , respectively. The thermal cycling results of this latest material using TGA measurement have proven attractive cycling stability of which the complete reoxidation of the samples was achieved. In addition, thermodynamic analysis of a reduction step was performed and good agreement of the theoretical reduction temperature of Co 2.25 Ni 0.75 O 4 with the experimental one has been found.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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