Solar electricity via an Air Brayton cycle with an integrated two-step thermochemical cycle for heat storage based on Fe2O3/Fe3O4 redox reactions: Thermodynamic and kinetic analyses

Bush, H. Evan; Loutzenhiser, Peter G.

doi:10.1016/j.solener.2018.09.043

Cited by 24 publications

(15 citation statements)

References 48 publications

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“…Conformation of Fe2O3 powder into foams or pellets was also investigated for TCS purposes in each of these shapes, materials showed rigid structures and redox reversibility over few cycles176 . However, detail observation of the porous architecture through SEM revealed micro-cracking, probably caused by the high temperatures attained, that could be seriously detrimental for the materials stability considering prolonged charge/discharge operation176 .More recently, Bush and Loutzenhiser evaluated the iron redox pair thermodynamics, kinetics and cycle stability 177. They found that reduction follows an Avrami-Erofeev reaction mechanism, while for oxidation a precise model could not be experimentally inferred due the most likely existence of two kinetic regimes depending on the oxidation extent.…”

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confidence: 99%

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

et al. 2019

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Among renewable energies, wind and solar are inherently intermittent and therefore both require efficient energy storage systems to facilitate a round-the-clock electricity production at global scale. In this context, concentrated solar power (CSP) stands out among other sustainable technologies because it offers the interesting possibility of storing energy collected from the sun as heat, by sensible, latent or thermochemical means. Accordingly, continuous electricity generation in the power block is possible even during off-sun periods, providing CSP plants with a remarkable dispatchability. Sensible heat storage has been already incorporated to commercial CSP plants. However, due to its potentially higher energy storage density, thermochemical heat storage (TCS) systems emerge as an attractive alternative for the design of next generation power plants, which are expected to operate at higher temperatures. Through these systems, thermal energy is used to drive endothermic chemical reactions, which can subsequently release the stored energy when needed through a reversible exothermic step. This review analyzes the status 2 of this prominent energy storage technology, its major challenges and future perspectives, covering in detail the numerous strategies proposed for the improvement of materials and thermochemical reactors. Thermodynamic calculations allow selecting high energy density systems, but experimental findings indicate that sufficiently rapid kinetics and long-term stability trough continuous cycles of chemical transformation are also necessary for practical implementation. In addition, selecting easy to handle materials with reduced cost and limited toxicity is crucial for large-scale deployment of this technology. In this work, the possible utilization of materials as diverse as metal hydrides, hydroxides or carbonates for thermochemical storage is discussed. Furthermore, especial attention is paid to the development of redox metal oxides, such as Co3O4/CoO, Mn2O3/Mn3O4 and perovskites of different compositions, as an auspicious new class of TCS materials due to the advantage of working with atmospheric air as reactant, avoiding the need of gas storage tanks. Current knowledge about the structural, morphological and chemical modifications of these solids, either caused during redox transformations, or induced wittingly as a way to improve their properties, is revised in detail. In addition, the design of new reactors concepts proposed for the most efficient use of TCS in concentrated solar facilities is also critically considered. Finally, strategies for the harmonic integration of these units in functioning solar power plants, as well as the economic aspects are also briefly assessed.

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confidence: 99%

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

et al. 2019

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“…CO 2 13,14. Therefore, iron oxide is expected to be a suitable candidate catalyst for the CO 2 reduction process.…”

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High Photothermally Active Fe₂O₃ Film for CO₂ Photoreduction with H₂O Driven by Solar Light

Zhang

Gao

Liu

et al. 2019

ACS Appl. Energy Mater.

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“…These processes are used to store both low-grade heat (<100°C) and medium-grade heat (100-400 °C) [144][145][146]. High kinetics at low temperatures make the sorption processes particularly attractive for low-temperature applications such as space heating, domestic hot water preparation or Some authors, e.g., Yu et al [126], use the definition sorption storage to indicate both reversible chemical reactions and sorption processes.…”

Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

“…These processes are used to store both low-grade heat (<100 • C) and medium-grade heat (100-400 • C) [143][144][145]. High kinetics at low temperatures make the sorption processes particularly attractive for low-temperature applications such as space heating, domestic hot water preparation or other low-grade and medium-grade heat uses [7,[146][147][148][149][150][151][152]. Usually sorption materials are liquid, solid and composite sorbents [35,153] Zeolite 13X [175][176][177][178][179][180][181][182], Zeolite 4A [183][184][185][186][187][188][189], Zeolite 5A [190,191]; • Aluminophosphates (ALPOs) [192] and Silico-aluminophosphates (SAPOs) [193][194][195]; • Composite materials made up by the combination of a salt hydrate and an additive with a porous structure and high thermal conductivity (expanded graphite [196,197], metal foam [198], carbon fiber [199] and activated carbon [199]).…”

Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

A Review of Thermochemical Energy Storage Systems for Power Grid Support

et al. 2020

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Power systems in the future are expected to be characterized by an increasing penetration of renewable energy sources systems. To achieve the ambitious goals of the “clean energy transition”, energy storage is a key factor, needed in power system design and operation as well as power-to-heat, allowing more flexibility linking the power networks and the heating/cooling demands. Thermochemical systems coupled to power-to-heat are receiving an increasing attention due to their better performance in comparison with sensible and latent heat storage technologies, in particular, in terms of storage time dynamics and energy density. In this work, a comprehensive review of the state of art of theoretical, experimental and numerical studies available in literature on thermochemical thermal energy storage systems and their use in power-to-heat applications is presented with a focus on applications with renewable energy sources. The paper shows that a series of advantages such as additional flexibility, load management, power quality, continuous power supply and a better use of variable renewable energy sources could be crucial elements to increase the commercial profitability of these storage systems. Moreover, specific challenges, i.e., life span and stability of storage material and high cost of power-to-heat/thermochemical systems must be taken in consideration to increase the technology readiness level of this emerging concept of energy systems integration.

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Solar electricity via an Air Brayton cycle with an integrated two-step thermochemical cycle for heat storage based on Fe2O3/Fe3O4 redox reactions: Thermodynamic and kinetic analyses

Cited by 24 publications

References 48 publications

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

High Photothermally Active Fe₂O₃ Film for CO₂ Photoreduction with H₂O Driven by Solar Light

A Review of Thermochemical Energy Storage Systems for Power Grid Support

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Solar electricity via an Air Brayton cycle with an integrated two-step thermochemical cycle for heat storage based on Fe2O3/Fe3O4 redox reactions: Thermodynamic and kinetic analyses

Cited by 24 publications

References 48 publications

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

High Photothermally Active Fe2O3 Film for CO2 Photoreduction with H2O Driven by Solar Light

A Review of Thermochemical Energy Storage Systems for Power Grid Support

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High Photothermally Active Fe₂O₃ Film for CO₂ Photoreduction with H₂O Driven by Solar Light