First experimental studies of solar redox reactions of copper oxides for thermochemical energy storage

Alonso, Elisa; Pérez-Rábago, Carlos; Licurgo, Javier; Fuentealba, Edward; Estrada, Claudio A.

doi:10.1016/j.solener.2015.03.005

Cited by 113 publications

(56 citation statements)

References 26 publications

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“…To select the variation ranges of parameters that were analysed, the publication of Alonso 10 was taken into account. Operational conditions were described in the publication and are also summarized above.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

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

Alonso

Gallo

Pérez-Rábago

et al. 2016

AIP Conference Proceedings

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Abstract. Thermochemical storage of solar energy consists in reversible chemical reactions that absorb the solar heat during an endothermic step and release it by means of an exothermic reaction. CuO/Cu 2 O and Co 3 O 4 /CoO redox pairs have a high potential as materials to store solar energy at high temperature. Cobalt oxides have been so far studied by several authors and works while copper oxides suitability has been recently proved. However, in both cases, operation parameters need to be optimized. A theoretical study of the effect of total pressure, gas/solid molar rate and composition of working atmosphere on the systems equilibrium is presented. The equilibrium displacement caused by these parameters is calculated and discussed. Finally, some ideas for tentative implementations of these systems are commented.

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Section: Thermodynamic Analysismentioning

confidence: 99%

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

Alonso

Gallo

Pérez-Rábago

et al. 2016

AIP Conference Proceedings

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“…Some single metal redox pairs such as Co 3 O 4 /CoO, BaO 2 /BaO, Mn 2 O 3 /Mn 3 O 4 , CuO/Cu 2 O, and Fe 2 O 3 /Fe 3 O 4 , and polymetallic oxide such as Fe–Co– and Ca–Mn–, can absorb and release O 2 (g) within a temperature range of 350 to 1100°C. Those reactants are considered to be potential TCES material, since their redox reaction is reversible.…”

Section: Brief Introduction Of Tces Systemmentioning

confidence: 99%

Progress in thermochemical energy storage for concentrated solar power: A review

et al. 2018

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Summary Energy plays an important role in a fast‐paced modern society. With the depletion of fossil energy, effective utilization of solar energy is getting increasingly urgent. Thermal energy storage is an inevitable choice for effective utilization of renewable energy sources. As one of the most promising renewable energy sources, solar energy is inexhaustible. But it has some shortcomings such as instability and intermittency, affected by time, climate, and geographical location. Thermal energy storage technology, which can effectively reduce the cost of concentrated solar power generation, plays a crucial role in bridging the gap between energy supply and demand. In addition, thermal energy storage subsystem can improve performance and reliability of the whole energy system. According to different principles, thermal storage technology is generally classified as sensible heat storage, latent heat storage, and thermochemical energy storage. Most solar thermal power generation systems, currently demonstrated and operated in the world, adopt the method of sensible thermal energy storage. In contrast, thermochemical energy storage is a relatively new concept, which is still in the stage of basic test and verification. Thermochemical energy storage technology stores and releases energy through endothermic and exothermic reversible reactions. A closed system with separated reactants and products, in theory, can store energy indefinitely. The main thermochemical energy storage systems include redox system, metal hydride system, carbonate decomposition system, ammonia decomposition system, methane reforming system, and inorganic hydroxide system.

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“…In these continuous reactors, it is possible to extract thermochemical and sensible thermal energy and, thus, increase the energy density of metal oxide particles. So far, solar receivers for the reduction of metal oxide particles by direct solar radiation apply rotary kiln,, gravity‐driven particle receivers, or packed bed reactors . A fluidized bed reactor and packed bed reactors, were investigated for reactors that are able to oxidize metal oxide particles and extract heat to a working fluid.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing Particles of Manganese‐Iron Oxide with Additives for Thermochemical Energy Storage

Preisner¹,

Block²,

Linder³

et al. 2018

Energy Tech

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Manganese‐iron oxide particles are a promising candidate for both chemical‐looping combustion (CLC) and thermochemical energy storage. In CLC, the ability of metal oxides to oxidize fuels in an oxygen‐free atmosphere and re‐oxidize in air is addressed. Whereas, reaction enthalpy is the main focus of thermochemical energy storage for, e. g. concentrated solar power or an industrial process that requires high temperature levels. Sufficient mechanical strength of the particles while they endure chemical, thermal, or mechanical stress is a crucial factor for both concepts. Particle stability is investigated here by adding 20 wt.% of TiO2, ZrO2, or CeO2 as a supportive material to (Mn0.7Fe0.3)2O3. Thermal cyclization and temperature shock tests are conducted in a packed bed reactor to identify chemical stability as well as the effect of chemical and thermal stress. A subsequent particle size distribution analysis is performed to determine the relevant breakage mechanism. Attrition resistance is tested with a customized attrition jet cup to estimate the mechanical strength of particles. It is found that the high tendency of unsupported manganese‐iron oxide particles towards agglomeration can be improved with any of the chosen additives. The particles with CeO2, and especially with ZrO2, as an additive indicate an increase in resistance towards attrition. However, adding TiO2 has a severe negative impact on the chemical reactivity of the manganese‐iron oxide.

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First experimental studies of solar redox reactions of copper oxides for thermochemical energy storage

Cited by 113 publications

References 26 publications

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

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

Progress in thermochemical energy storage for concentrated solar power: A review

Stabilizing Particles of Manganese‐Iron Oxide with Additives for Thermochemical Energy Storage

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