Thermodynamic evaluation of water splitting by a cation-excessive (Ni, Mn) ferrite

Tamaura, Yutaka; Kojima, M.; Sano, Taizo; Ueda, Y.; Hasegawa, Noriko; Tsuji, Masamichi

doi:10.1016/s0360-3199(98)00007-x

Cited by 73 publications

(31 citation statements)

References 9 publications

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“…Hydrogen production via the water oxidation of metal oxides with a spinel structure in the presence of sodium carbonate was pioneered by Tamaura et al (20,21). However, their cycle was not closed due to the use of sacrificial Fe 2 O 3 to extract Na þ from sodium manganese iron oxide produced in the hydrogen evolution step (22).…”

Section: Resultsmentioning

confidence: 99%

Low-temperature, manganese oxide-based, thermochemical water splitting cycle

Bhawe

Davis

2012

Proc. Natl. Acad. Sci. U.S.A.

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Thermochemical cycles that split water into stoichiometric amounts of hydrogen and oxygen below 1,000°C, and do not involve toxic or corrosive intermediates, are highly desirable because they can convert heat into chemical energy in the form of hydrogen. We report a manganese-based thermochemical cycle with a highest operating temperature of 850°C that is completely recyclable and does not involve toxic or corrosive components. The thermochemical cycle utilizes redox reactions of Mn(II)/Mn(III) oxides. The shuttling of Na þ into and out of the manganese oxides in the hydrogen and oxygen evolution steps, respectively, provides the key thermodynamic driving forces and allows for the cycle to be closed at temperatures below 1,000°C. The production of hydrogen and oxygen is fully reproducible for at least five cycles.hydrogen production | Na + extraction | multistep cycle T hermochemical production of hydrogen and oxygen from water involves a series of chemical reactions that convert water into stoichiometric amounts of hydrogen and oxygen using heat as the only energy source. Thermochemical water splitting is of interest because it directly converts thermal energy into stored chemical energy (hydrogen and oxygen). Research on thermochemical water splitting cycles largely began in the 1960s and 1970s and involved nuclear reactors (1, 2) and solar collectors (3) as the energy sources. Numerous reviews of the thermochemical cycles proposed and experimentally investigated are available, e.g., (4). A large number of thermochemical cycles for splitting water has been proposed, and generally can be grouped into two broad categories: high-temperature two-step processes (5, 6) and lowtemperature multistep processes (7,8). One of us (M.E.D.) has conducted previous research on low-temperature multistep processes in the 1970s (9).Low-temperature multistep processes, typically with the a highest operating temperature below 1,000°C, allow for the use of a broader spectrum of heat sources, such as heat from nuclear power plants, and hence have attracted considerable attention. The majority of existing low-temperature processes produces intermediates that can be complex, corrosive halide mixtures. One of these processes, the sulfur-iodine cycle, has been studied extensively, and even piloted for implementation (8). This process produces strongly acidic mixtures of sulfuric and iodic acids that create significant corrosion issues, but requires only one high-temperature step at ca. 850°C. Two-step processes typically involve simpler reactions and intermediates, e.g., solid metal oxides, than the low-temperature multistep cycles. However, the temperatures required to close these types of cycles are well above 1,000°C. Because of the requirement of high-temperature heat sources, these types of cycles have been investigated for use with solar concentrators (10, 11). These cycles typically consist of one step that involves the oxidation of a metal [such as zinc (12)] or a metal oxide [such as iron (II) oxide (6, 13)] by water to produce...

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Section: Resultsmentioning

confidence: 99%

Low-temperature, manganese oxide-based, thermochemical water splitting cycle

Bhawe

Davis

2012

Proc. Natl. Acad. Sci. U.S.A.

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“…Although the feasibility of the iron oxide based cycle has been demonstrated [73,75], the thermodynamic requirements (operating temperature for the thermal reduction >1800 • C) in combination with the material properties (melting temperatures of FeO around 1400 • C [76]) prohibit the development of possible processing schemes. The use of mixed metal ferrites (with Mn, Ni, Zn) lowers the temperature of the activation step and avoids phase transformations [77][78][79][80]. In combination with a high-temperature stable zirconia support, a material is gained that can be re-used for several cycles without elaborate processing [53,81].…”

Section: Thermochemical Cycles Under Considerationmentioning

confidence: 99%

Functioning devices for solar to fuel conversion

Mul¹,

Schacht²,

Swaaij³

et al. 2012

Chemical Engineering and Processing: Process Intensification

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a b s t r a c tThis paper provides a perspective on the technologies capable of converting solar energy, CO 2 and H 2 O into an easy to use fuel. The paper addresses bio-based approaches, but mainly focuses on (i) the combination of photovoltaic (PV) devices and electrocatalysis, (ii) single unit operation by photocatalytic conversion, and (iii) solar thermal conversion. Each option is described in a general manner, including a brief evaluation of the advantages and disadvantages. Also suggestions for future research endeavours are given. Based on the used literature data, for electrocatalytic and photocatalytic technologies, dramatic improvements should be made in material optimization, as well as reactor design and operation. Large efficiency gains are necessary to enable use of these technologies in practice. Solar thermal conversion is more mature, and requires specific optimization in processing, as will be discussed.

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“…These calculations can provide great insight into mechanisms of the reaction pathway and the material properties that can limit or enhance active material performance. Recent works using DFT calculations to elucidate design principles for improved solar thermochemical cycle active materials have suggested that the thermodynamics of forming oxygen vacancies in a metal oxide lattice and the kinetics of conducting those vacancies (Kodama et al, 2008;Gokon et al, 2011;Kodama et al, 2005;Rydén et al, 2011;Alvani et al, 2005;Tamaura et al, 1998;Hwang et al, 2004;Miller et al, 2008;Fresno et al, 2009;Fresno et al, 2010;Arifin et al, 2012;Gokon et al, 2008b;Agrafiotis et al, 2015;Agrafiotis et al, 2012;Goikoetxea et al, 2016;Lorentzou et al, 2014;Cha et al, 2007;Kodama et al, 2002) to and from the surface are important in assessing material activity (Michalsky et al, 2015a,b;Ezbiri et al, 2015). Indeed, a study data mining first principles data from doped ceria studies identified surface oxygen vacancy formation energy as the primary descriptor that correlates with enhanced water splitting ability (Botu et al, 2016).…”

Section: Materials Chemistry-ab Initio Methodsmentioning

confidence: 99%

“…The studies on ferrite-based systems have shown that required reduction temperatures can be lowered by substituting metals such as manganese or nickel into ferrite based mixed metal oxides of the type M x Fe 3-x O 4 (Steinfeld, 2005). Co, Ni, Zn, Cu, and Mn substitutions into ferrite spinel structures have recently been used in successful hightemperature H 2 O/CO 2 splitting, suggesting that the M x Fe 3-x O 4 form of these mixed oxides is particularly active (Kodama et al, 2008;Gokon et al, 2011;Kodama et al, 2005;Rydén et al, 2011;Alvani et al, 2005;Tamaura et al, 1998;Hwang et al, 2004;Miller et al, 2008;Fresno et al, 2009;Fresno et al, 2010;Arifin et al, 2012;Gokon et al, 2008b;Agrafiotis et al, 2015;Goikoetxea et al, 2016;Lorentzou et al, 2014;Cha et al, 2007;Kodama et al, 2002). Other spinel structures are also of interest, such as the ''hercynite cycle" (Muhich et al, 2013 (Haussener et al, 2010c).…”

Section: Reaction Kineticsmentioning

confidence: 99%

Modelling of solar thermochemical reaction systems

et al. 2017

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a b s t r a c tThis article reviews the progress, challenges and opportunities in numerical modelling of thermal transport, thermochemical reactions and thermomechanics in high-temperature solar thermochemical systems. Continuum-scale models are presented in mathematical detail while highlighting the literature that uses them. The discussion is enhanced by selected examples of numerical studies of solar thermochemical systems for solar fuels and commodity material production. Property predictions necessary for the modelling of solar thermochemical reaction systems are covered.

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Thermodynamic evaluation of water splitting by a cation-excessive (Ni, Mn) ferrite

Cited by 73 publications

References 9 publications

Low-temperature, manganese oxide-based, thermochemical water splitting cycle

Low-temperature, manganese oxide-based, thermochemical water splitting cycle

Functioning devices for solar to fuel conversion

Modelling of solar thermochemical reaction systems

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