Hydrogen storage and production by redox of iron oxide for polymer electrolyte fuel cell vehicles

Otsuka, Kiyoshi; Yamada, Chisa; Kaburagi, Tomohiro; Tanaka, Sakae

doi:10.1016/s0360-3199(02)00070-8

Cited by 135 publications

(93 citation statements)

References 4 publications

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“…1. The SEM images for the iron oxide samples with Al, Sc, Ti, Ga or Zr cations also showed that the iron species in these samples were not aggregated significantly after the repeated redox cycles 5), 6) . In contrast to Cr _ FeOx and Mo _ FeOx, particles of iron species with diameters larger than 200 nm were observed in the SEM image of Ni _ FeOx after three redox cycles 5),6) .…”

Section: Role Of Additives In the The Redox Reactions Of Iron Oxidementioning

confidence: 86%

“…These results indicate that the precipitation method of Fe(OH)3 provided iron oxide particles with smaller diameters and larger surface areas. Figure 2 shows the results for the redox of pure iron oxides prepared with the precipitation method 6) . Iron species in the fresh iron oxide samples were present as Fe2O3.…”

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

“…Iron oxide samples without and with metal cations (M) are denoted as FeOx and M _ FeOx, respectively. Figure 3 shows the results of the reduction with H2 at 603 K and the subsequent oxidation with H2O at 653 K for FeOx, Cr _ FeOx, Ga _ FeOx and Zr _ FeOx 6) . The change in the reduction degree of iron oxides is plotted as a function of reaction time in Fig.…”

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

“…The effects of additives other than Cr, Ga and Zr cations on the repeated redox of the iron oxide samples were also investigated. Figure 4 shows the consumption rates of H2 during reduction and the formation rates of H2 during oxidation of each iron oxide sample 6) . The consumption rate and the formation rate of H2 were evaluated from the average rate estimated in the changes of the reduction degree between 35 and 50%, and between 70 and 55%, respectively.…”

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

“…Thus, additives such as Al, Sc, Ti, Cr, Ga, Zr and Mo cations mitigate the sintering of iron metals and/or iron oxides during repeated redox cycles. Figure 9 shows the specific surface areas of FeOx, Al _ FeOx, Cr _ FeOx, and Mo _ FeOx before and after three redox cycles of reduction with H2 at 823 K and subsequent oxidation with H2O at 873 K 6) . The specific surface areas of the fresh Al _ FeOx, Cr _ FeOx and Mo _ FeOx were larger than that of fresh FeOx.…”

Section: Role Of Additives In the The Redox Reactions Of Iron Oxidementioning

confidence: 99%

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Storage and Supply of Pure Hydrogen Mediated by the Redox of Iron Oxides

Otsuka

Tanaka

2004

J. Jpn. Petrol. Inst.

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Methods for the storage and supply of pure H2 are proposed based on the reduction of iron oxide with H2 (Fe3O4 + 4H2 3Fe + 4H2O) followed by the oxidation of the iron metal with H2O (3Fe + 4H2O Fe3O4 + 4H2). In addition, production of pure H2 from CH4 is proposed based on the reduction of iron oxides with CH4 (Fe3O4 + CH4 3Fe + CO2 + 2H2O) and the subsequent oxidation of iron metal with H2O (3Fe + 4H2O Fe3O4 + 4H2). Iron oxides without other metal elements were deactivated quickly during these redox cycles due to sintering irrespective of the reductant (H2 or CH4). The addition of metal cations such as Al, Sc, Ti, V, Cr, Ga, Zr or Mo cations mitigated the sintering of iron oxides and/or iron metals during repeated redox cycles. The addition of metal species such as Cu, Ni, Pt and Rh promoted the reactivity of iron oxides in the redox reaction at lower temperatures. The favorable effects of the addition of these metal species on the redox of iron oxides were observed for both reduction with H2 or with CH4. Therefore, iron oxide modified with these cations and metals can supply pure H2 continuously throughout these redox cycles. The favorable effects of the metal species added to iron oxides were investigated based on the local structures.

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Section: Role Of Additives In the The Redox Reactions Of Iron Oxidementioning

confidence: 86%

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

Section: Modification Of Iron Oxide Mediatorsmentioning

confidence: 99%

Section: Role Of Additives In the The Redox Reactions Of Iron Oxidementioning

confidence: 99%

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Storage and Supply of Pure Hydrogen Mediated by the Redox of Iron Oxides

Otsuka

Tanaka

2004

J. Jpn. Petrol. Inst.

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Metallic Architectures from 3D‐Printed Powder‐Based Liquid Inks

Jakus

Taylor

Geisendorfer

et al. 2015

Adv Funct Materials

183

109

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A new method for complex metallic architecture fabrication is presented, through synthesis and 3D‐printing of a new class of 3D‐inks into green‐body structures followed by thermochemical transformation into sintered metallic counterparts. Small and large volumes of metal‐oxide, metal, and metal compound 3D‐printable inks are synthesized through simple mixing of solvent, powder, and the biomedical elastomer, polylactic‐co‐glycolic acid (PLGA). These inks can be 3D‐printed under ambient conditions via simple extrusion at speeds upwards of 150 mm s–1 into millimeter‐ and centimeter‐scale thin, thick, high aspect ratio, hollow and enclosed, and multi‐material architectures. The resulting 3D‐printed green‐bodies can be handled immediately, are remarkably robust, and may be further manipulated prior to metallic transformation. Green‐bodies are transformed into metallic counterparts without warping or cracking through reduction and sintering in a H2 atmosphere at elevated temperatures. It is shown that primary metal and binary alloy structures can be created from inks comprised of single and mixed oxide powders, and the versatility of the process is illustrated through its extension to more than two dozen additional metal‐based materials. A potential application of this new system is briefly demonstrated through cyclic reduction and oxidation of 3D‐printed iron oxide constructs, which remain intact through numerous redox cycles.

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A Comprehensive Review on the Development of Solid‐State Metal–Air Batteries Operated on Oxide‐Ion Chemistry

Zhang

Huang

2020

Advanced Energy Materials

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The recently developed solid oxide metal–air redox battery (SOMARB) operating on oxide‐ion chemistry represents an emerging and promising energy storage technology, which is well suited for managing grid stability and efficiently harvesting renewable energy. Compared to widely reported metal–air batteries operating on liquid‐phase alkali‐ion or alkaline chemistries, the SOMARB uniquely features a direct reduction of the high concentration of O2 molecules in the gas phase without invoking the detrimental formation of a diffusion‐blocking oxide phase on the surface of the oxygen electrode. A typical SOMARB is composed of a reversible solid oxide cell (RSOC) and an energy storage unit (ESU), which is capable of storing a high capacity of energy at high power without safety concerns. In this article, the SOMARB concept birth and development are reviewed and discussed with the fundamental differences separating it from other types of metal–air batteries, along with the challenges and opportunities around commercialization. Particular focus is placed on the functional materials tailored for ESU and RSOC applications, including recent experimental and computational efforts to boost the redox activity of Fe‐based ESU materials and the performance of intermediate temperature RSOCs. Finally, candid opinions are offered on the challenges and opportunities facing the future development of SOMARBs toward large‐scale energy storage applications.

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Hydrogen storage and production by redox of iron oxide for polymer electrolyte fuel cell vehicles

Cited by 135 publications

References 4 publications

Storage and Supply of Pure Hydrogen Mediated by the Redox of Iron Oxides

Storage and Supply of Pure Hydrogen Mediated by the Redox of Iron Oxides

Metallic Architectures from 3D‐Printed Powder‐Based Liquid Inks

A Comprehensive Review on the Development of Solid‐State Metal–Air Batteries Operated on Oxide‐Ion Chemistry

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