Thermodynamic study of CuO/Cu2O and Co3O4/CoO redox pairs for solar energy thermochemical storage

Alonso, Elisa; Gallo, A.; Pérez-Rábago, Carlos; Fuentealba, Edward

doi:10.1063/1.4949102

Cited by 16 publications

(6 citation statements)

References 23 publications

(34 reference statements)

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“…Ni x Co y Mn z O 4 calcined at 500 °C show less surface Co 3+ species compared to Ni x Co y Mn z O 4 -300, making Co 2+ species predominant. Increasing the temperature up to 700 °C might lead to the self-reduction of Co 3+ to Co 2+ species on the surface of the oxide. , O 1s spectra (Figure c) consist of two peaks centered around 529.6–529.8 and 531.2–531.4 eV for each sample that are attributed to M–O–M (M = Ni, Co, or Mn) and OH groups, respectively . The oxidation state of Mn can be distinguished using the Mn 3s peak.…”

Section: Resultsmentioning

confidence: 99%

Nanocast Mixed Ni–Co–Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction

Priamushko

Guillet‐Nicolas

et al. 2020

ACS Appl. Energy Mater.

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Nanocasting or hard-templating is a versatile method to produce ordered mesoporous mixed transition metal oxides (MTMOs) with promising potential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, a comprehensive investigation was conducted on various Ni x Co y Mn z O4 replicated from large pore KIT-6 silica. The materials were calcined at different temperatures to study the influence of the oxide formation and the resulting pore structure ordering, as well as surface properties, on the electrochemical activity and stability of the catalysts. After a comprehensive characterization, electrocatalytic performances of the materials were investigated in detail for OER to find a structure–activity relationship. In OER, a correlation was established between calcination temperature, pore and surface properties, and the overall efficiency and stability. The best sample, Ni x Co y Mn z O4 calcined at 300 °C, provided a reasonable current density (25 mA/cm2 at 1.7 V vs RHE) and an overpotential of 400 mV at 10 mA/cm2, and demonstrated increased current density (above 200 mA/cm2 at 1.7 V vs RHE) once loaded into a Ni foam compared to the bare foam. This sample also remained stable over 15 h. Our results indicate that the calcination temperature greatly affects the porosity, crystalline structure, phase composition, and the activity of the catalysts toward OER.

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Section: Resultsmentioning

confidence: 99%

Nanocast Mixed Ni–Co–Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction

Priamushko

Guillet‐Nicolas

et al. 2020

ACS Appl. Energy Mater.

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“…During the past years, BaO 2 /BaO, , CuO/Cu 2 O, Co 3 O 4 /CoO, − Mn 2 O 3 /Mn 3 O 4 , − perovskite-based, − and Li–Mn spinels-based systems have been suggested as promising redox couples for TCS. Research efforts have been focused on developing more efficient materials, ,,, novel TCS reactor concepts, − or addressing the integration of such systems in a CSP plant. , Two of the main problems associated with several of the aforementioned redox materials are the slow kinetics of the oxidation step and the degradation that many of these oxides suffered due to the high temperatures attained in the charge/discharge cycling process. Both chemical ,− and morphological ,,, modifications have been explored as pathways for improving the kinetics and the chemical stability of such redox couples.…”

Section: Introductionmentioning

confidence: 99%

Understanding Redox Kinetics of Iron-Doped Manganese Oxides for High Temperature Thermochemical Energy Storage

et al. 2016

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Thermochemical heat storage based on redox oxides has been proposed as suitable alternative for future concentrating solar plants working at high temperatures. In particular, the (Mn0.8Fe0.2)2O3/(Mn0.8Fe0.2)3O4 redox couple is a promising system owing to its reduced cost, adequate thermodynamic characteristics, and high stability over prolonged cycling. As demonstrated in this work, such redox materials can withstand over 75 reduction/oxidation (charge/discharge) chemical loops. The outstanding durability that this system exhibits has prompted a more comprehensive assessment of the kinetics of both charging and discharging reactions. The goal of this work has been twofold. First, on the basis of data extracted from thermogravimetric analysis, we propose a rate law model for both reduction and oxidation reactions that could help to the future reactor design. Second, aided by in situ XRD and Raman spectroscopy, we have gained further insight into the crystallographic transformations that take place during such redox processes and about the role of Fe incorporation on the oxidation improvement. Kinetic modeling results indicated that both reactions might be well described by a nucleation and growth mechanism. In situ XRD confirmed the presence of two spinel phases (cubic and tetragonal) in the reduced form. Finally, Raman spectroscopy analyses suggested that Fe incorporation alter the metal oxide bond lengths; namely, Fe doping induced an enlargement of Mn–O bonds. This structural modification can facilitate the rearrangement of the coordination polyhedra, and it correlates well with a rise in oxidation rate with increasing the amount of Fe incorporated into the Mn oxide.

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“…2M + 2H 2 O → 2MOH + H 2 (8) Many thermochemical cycles with metal oxide redox couple have been proposed [82], including Fe 3 O 4 /FeO [83][84][85][86], TiO 2 /TiO x [87], Mn 3 O 4 /MnO [88], Co 3 O 4 /CoO [89,90], ZnO/Zn [86,91,92], SnO 2 /SnO [93][94][95], CeO 2 /Ce 2 O 3 [96,97], CdO/Cd [98,99] and W/WO 3 [100]. The most investigated materials are zinc, iron and ceria metal oxides.…”

Section: Of 96mentioning

confidence: 99%

Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses

et al. 2020

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Innovative renewable routes are potentially able to sustain the transition to a decarbonized energy economy. Green synthetic fuels, including hydrogen and natural gas, are considered viable alternatives to fossil fuels. Indeed, they play a fundamental role in those sectors that are difficult to electrify (e.g., road mobility or high-heat industrial processes), are capable of mitigating problems related to flexibility and instantaneous balance of the electric grid, are suitable for large-size and long-term storage and can be transported through the gas network. This article is an overview of the overall supply chain, including production, transport, storage and end uses. Available fuel conversion technologies use renewable energy for the catalytic conversion of non-fossil feedstocks into hydrogen and syngas. We will show how relevant technologies involve thermochemical, electrochemical and photochemical processes. The syngas quality can be improved by catalytic CO and CO2 methanation reactions for the generation of synthetic natural gas. Finally, the produced gaseous fuels could follow several pathways for transport and lead to different final uses. Therefore, storage alternatives and gas interchangeability requirements for the safe injection of green fuels in the natural gas network and fuel cells are outlined. Nevertheless, the effects of gas quality on combustion emissions and safety are considered.

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Thermodynamic study of CuO/Cu2O and Co3O4/CoO redox pairs for solar energy thermochemical storage

Cited by 16 publications

References 23 publications

Nanocast Mixed Ni–Co–Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction

Nanocast Mixed Ni–Co–Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction

Understanding Redox Kinetics of Iron-Doped Manganese Oxides for High Temperature Thermochemical Energy Storage

Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses

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