Fe-air Battery Research Articles

Proton Exchange Membrane for Iron Air/Flow Battery Application

Iron air/redox flow battery is the next promising battery system that can bridge the drawbacks of a static battery, at least in medium to high storage systems, due to the distinguishing difference from its static counterpart. It comes with the main advantages: the high current discharge and a flowing electrolyte, which can significantly suppress the formation of dendrite and passivation without imposing permanent damage to the cell structure. Iron, the fourth most abundant metal on the earth's crust, comes at a lower cost and requires less corrosion protection.This technology has received less attention than others due to overpotential/overvoltage and high Hydrogen evolution reaction on the anode. Different promising approach has been explored to improve the cycling stability of iron air batteries; by adding different electrolyte additives to suppress passivation and hydrogen evolution during discharge, improving the air cathode design by including dual or bifunctional electrocatalyst, and recent modification of the anode has helped realize a better iron air battery by facilitating a high surface area iron electrode using nanosized iron particle, and these create more electrode available to electrolyte and further adding a suitable additive to the electrode and electrolyte and increase charge capacity.Nonetheless, the battery working components begin to degrade as they interact; these cannot be stopped as batteries are consumable objects, but they can be delayed by improving the membrane separator's physical-chemical properties like conductivity, swelling ratio, selectivity, and membrane stability. Membrane's critical role aid in the improvement of the battery performance by separating the air cathode and metal anode electrode compartments to prevent short-circuiting, facilitate proton transfer, act as an electron insulator, and prevent fuel crossover, therefore improving the battery cycle life. The presentation will cover the basic working principle of the iron-air/redox flow battery and its prospective future in grid application and a brief report on the role of composite proton exchange membrane and their influence on cycle stability. ReferencesSakai, T., Inoishi, A., Ogushi, M., Ida, S., & Ishihara, T. (2016). Characteristics of fe-air battery using Y2O3-stabilized-ZrO2 electrolyte with Ni–Fe electrode and Ba0.6La0.4CoO3-δ electrode operated at intermediate temperature. Journal of Energy Storage, 7, 115-120.Abbasi, A., Hosseini, S., Somwangthanaroj, n., Cheacharoen, R., Olaru, S., & Kheawhom, S. (2020). Discharge profile of a zinc-air flow battery at various electrolyte flow rates and discharge currents. Scientific Data, 7(1), 196.Leung, P., Li, X., De León, C. P., Berlouis, L., Low, C. J., & Walsh, F. C. (2012). Progress in redox flow batteries, remaining challenges and their applications in energy storage. Rsc Advances, 2(27), 10125-10156.Karomah, A. (2021). Iron-air batteries: A breakthrough in green energy. . Retrieved 17 march, 2022, from https://www.azom.com/article.aspx?ArticleID=20872.McKerracher, R., Ponce de León, C., Wills, R. G. A., Shah, A., & Walsh, F. (2014). A review of the Iron–Air secondary

A Dual Photoelectrode Photoassisted Fe-Air Battery: The Photo-Electrocatalysis Mechanism Accounting for the Improved Oxygen Evolution Reaction and Oxygen Reduction Reaction of Air Electrodes.

Effective utilization of solar energy in battery systems is a promising solution to achieve sustainable and green development. In this work, a photoassisted Fe-air battery (PFAB) with two photoelectrodes of ZnO-TiO2 heterostructure and polyterthiophene (pTTh)-coated CuO (pTTh-CuO) grown on fluorine-doped tin oxide (FTO) is proposed. The band structure of semiconductors and the charge-transfer mechanism of heterostructure are studied. The electrochemical results show that the photogenerated electrons and holes play key roles in reducing the oxygen evolution reaction (OER)/oxygen reduction reaction (ORR) overpotential in the discharging and charging processes, respectively. The short-circuit current density, the open-circuit voltage, and the maximum power output of the PFAB can reach 34.28mA cm-2 , 1.15V, and 5.69mW cm-2 upon illumination, respectively. The photoassisted Fe-air battery exhibits a low charge voltage of 0.64V for ZnO-TiO2 as photoelectrode and a discharge voltage of 1.38V for pTTh-CuO as a photoelectrode at 0.1mA cm-2 .

Electrochemical characters of α-Fe2O3 hexagonal platelets synthesized by a facile hydrothermal route

Fe2O3 materials with various morphologies were synthesized from iron (III) chloride (FeCl3.6H2O) by a facile hydrothermal route for Fe-air battery anodes. The crystal structure and morphology of the obtained Fe2O3 powder were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The morphologies, shapes and sizes of Fe2O3 particles synthesized via the hydrothermal method were controllable by the concentration of precursors. The composite electrodes were fabricated by mixing the synthesized Fe2O3 powders with nanocarbon and were then subjected to electrochemical measurements. The results indicated that the shape and size of iron oxide affected the electrochemical properties of Fe2O3/carbon composite electrodes. The concentration of electrode components also significantly influenced the cyclability of Fe2O3/carbon composite electrodes

Improved battery capacity and cycle life in iron-air batteries with ionic liquid

Hydrogen releasing and electrode passivation are the major factors resulting in low cycling stability of Fe-air batteries with battery capacity deterioration. Here we introduce a new approach to restrain these drawbacks by adding ionic liquid (1-ethyl-3-methylimidazolium L-(+)-lactate, abbrev. EML) as an electrolyte additive to suppress both hydrogen releasing and passivation formation on the electrode surface during battery discharge. By utilizing hydrogen volume, electrochemical, and battery capacity measurements, the impact of ionic liquid EML on the performance of the Fe-air battery has been clearly demonstrated. The introduction of EML as an electrolyte additive allows for the inhibition of hydrogen releasing with an efficiency of over 97%. The nature of ionic liquid EML enables to prevent the passive layer formation on the Fe electrode surface by forming iron (II) lactate instead of iron oxides. As a result, a Fe-air battery with ionic liquid EML achieves capacity retention after 1000 cycles higher than 94% with a nominal capacity of 0.416 Ah g−1 at C/5. This approach provides a promising direction for the future development of ionic liquids as electrolyte additives that can be used to improve the cycling life of Fe-air batteries.

Fe3O4-embedded rGO composites as anode for rechargeable FeOx-air batteries

A simple formation of iron oxide (Fe3O4)-embedded reduced graphene oxide (rGO) composite was demonstrated using the chemical precipitation method proposed in this study. The rGO consisted of exfoliated nanosheets serves as a good framework for penetration and adsorption of the Fe precursor, allowing homogeneous formation of Fe3O4 crystals within the rGO nanosheet structure. The Fe3O4/rGO composite electrode, containing 60 wt.% Fe3O4, demonstrated promising electrochemical behavior at different scan rates. In a three-electrode charge-discharge measurement, a prolonged cyclic performance with good capacity retention for 100 cycles was obtained. In the battery performance evaluation for alkaline aqueous rechargeable Fe-air batteries, a maximum and stable discharge capacity of approximately 420 mA h g−1 was achieved. This simple fabrication method of Fe3O4/rGO composites is very promising not only for large-scale active materials fabrication for Fe-air batteries with enhanced performance, but also serves as a good platform for the development of complex-oxide-rGO hybrids in high performance energy storage materials.

Hierarchical Structural Changes During Redox Cycling of Fe-Based Lamellar Foams Containing YSZ, CeO2, or ZrO2.

Several high-temperature energy conversion and storage technologies rely on redox cycling of Fe-based materials, including storage materials in solid-oxide Fe-air batteries and oxygen carriers in chemical-looping combustion. The materials' macroporosity necessary for gas flow is, however, irreversibly diminished during redox cycling due to (i) large volume changes during the redox transformations, (ii) foam sintering at elevated operating temperature (550-900 °C), and (iii) formation and growth of Kirkendall microporosity. To address these challenges, we use directional freeze-casting to create highly porous, lamellar, Fe-composite foams containing uniformly distributed sintering inhibitor (SI) particles-either Y2O3-stabilized ZrO2 (YSZ), CeO2, or ZrO2-at 0, 5, 10, or 15% of the solid volume. We characterize these foams before, during, and after redox cycling (Fe/FeO/Fe3O4, via H2O and H2) at 800 °C using operando synchrotron X-ray microtomography, metallography, and scanning electron microscopy. Shrinkage of the foam volume and formation of a gas-blocking shell surrounding the foam are reduced as the SI fraction increases. Volumetric shrinkage after the first five redox cycles is decreased from 66% (for pure-Fe foams) to 45% (for all Fe-composites containing 5 vol % SI). Foams containing 15 vol % YSZ show no volumetric shrinkage after five cycles, although, after 20 cycles, they have shrunk 53%. Post-cycling analysis reveals segregation of the SI particles to the cores of individual lamellae, surrounded by thick layers of sintered Fe on the lamellae surfaces. This segregation occurs due to Fe diffusion through FeO to the lamellae surfaces during oxidation, leaving behind the SI particles, which are then pushed into clusters by FeO/Fe3O4 contraction during reduction. The SI is thus rendered ineffective, which explains why foam densification is delayed (compared with pure-Fe foams), rather than fully prevented, after repeated cycling.

α-Fe2O3 Urchins Synthesized by a Facile Hydrothermal Route as an Anode for an Fe-Air Battery

High-performance anode materials for Fe-air batteries were synthesized using α-Fe2O3 microparticles with a high porosity and a large actual surface area via a hydrothermal method. Fe2O3/AB composite electrodes were fabricated by mixing the synthesized α-Fe2O3 microparticles with acetylene black (AB) carbon and subjected to electrochemical measurements. The α-Fe2O3/AB electrode cycleability of the synthesized α-Fe2O3 microparticles with two structures, namely porous sphere-like (urchin) and porous plate-like, was better than that of commercially available Fe2O3. The morphological characteristics and porosity of Fe2O3 influenced the electrochemical properties of the Fe2O3/AB composite electrodes, viz. the capacity provided by urchin-shaped structures was larger than that given by porous plates. The high porosity of α-Fe2O3 particles caused a large internal resistance and resulted in a decreased capacity of electrodes. Thus, urchin-shaped α-Fe2O3 microparticles could be used as an active electrode material for Fe-air battery anodes.

Electrochemical properties of Fe2O3/AB based composite electrodes in alkaline solution

To find a suitable material for Fe-air battery anode, Fe2O3 nanoparticles (nm) and microparticles (µm) were used as active materials and Acetylene Black carbon (AB) as additive to prepare Fe2O3/AB composites. The effect of grain size of iron oxide particles and additives on the electrochemical behavior of Fe2O3/AB composite electrodes in alkaline solution have been investigated using cyclic voltammetry (CV), galvanostatic cycling and electrochemical impedance spectroscopy (EIS) measurements. Iron oxide nanoparticles provided better cyclability than iron oxide microparticles. Impedance of electrode increased during cycling but the nm-Fe2O3/AB electrode gave smaller resistance than µm-Fe2O3/AB one. The additives showed strongly effects on the electrochemical behaviors of iron oxide electrodes. The AB additive enhanced the electric conductivity of Fe2O3/AB electrode and thus increased the redox reaction rate of iron oxide while K2S interacted and broke down the passive layer leading to improved cyclability and giving higher capacity for Fe2O3/AB electrodes.

Hydrothermal Preparation of Fe2O3 Nanoparticles for Fe-Air Battery Anodes

Fe2O3 nanoparticles were synthesized from iron nitrate [Fe(NO3)3·9H2O] by hydrothermal method for Fe-air battery anodes. The crystal structure and morphology of the obtained Fe2O3 powder were studied by x-ray diffraction and scanning electron microscopy. Fe2O3/acetylene black (AB) composite electrodes were fabricated by mixing the synthesized Fe2O3 nanoparticles with AB carbon and were then subjected to electrochemical measurements. Results indicated that the duration of hydrothermal treatment significantly influences the morphology and size of synthesized Fe2O3. The morphology and particle size of Fe2O3 also affect the electrochemical properties of Fe2O3/AB composite electrodes, viz., smaller particles provide greater capacity than larger ones. The resistance of electrodes gradually increases during cycling, thereby causing a decrease in the capacity of Fe2O3/AB electrodes.

Performance and degradation behavior of carbonyl Fe – MoS2 composite as anode material in Fe-air batteries

The two technical limitations of iron-air batteries are: (1) Hydrogen evolution reaction (HER) and (2) Passivation. HER account for low charging efficiency while passivation in Fe-air batteries account for its inability to fully discharge at a high rate due to the formation of iron hydroxide. As a result of this, many studies has been dedicated to inhibit these problems. Just like in recent literature, the enhancement of Fe-air anode for commercialization is not trivial. With high purity carbonyl Fe–MoS2 composites electrode and the influence of 2 mM Na2S additives in 6 M KOH electrolyte solution and 1.88 wt % polyacrylic acid as the gelling agent, we have demonstrated a high performance carbonyl Fe anodes comprising of 3 wt % MoS2 (F3M), 5 wt % MoS2 (F5M), and 10 wt % MoS2 (F10 M) additives in Fe anodes. The result of the various electrodes characterized via field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) reveals a distinct surface morphology that correspond to fundamental crystallographic growth patterns. Additionally, Energy dispersive spectroscopy (EDS) and SEM mapping affirms that both the Fe and additive (weight (Wt. %) and atomic percent (At. %)) were well dispersed in the electrode. According to Tafel test, F3M, F5M, and F10 M exhibits corrosion inhibition efficiency of 51.2%, 21.1% and 5.6% respectively. Thus, the corrosion rate decreased in the order of bare Fe > F10 M > F5M > F3M. While drastic capacity retention drops occur in the bare Fe electrode around 300th cycle, we were able to regenerate the battery back to full capacity via our choice of additives (F3M). During regeneration at 800th cycles, the capacity retention of F3M, F5M and F10 M electrodes were 97%, 93%, and 76% respectively. Therefore, in conjunction with the unique structure and synergistic effect that characterizes two excellent anode materials, F3M is best choice for a high-performance Fe-air battery due to its excellent performance, low side effects (corrosion and passivation), low float current, superior capacity retention and efficiency during cycling compare to F5M and F10 M.

Facile formation of Fe3O4-particles decorated carbon paper and its application for all-solid-state rechargeable Fe-air battery

A facile and feasible method for decoration of iron oxide (Fe3O4) submicron-sized particles on carbon paper at room temperature in a short time of 10 min is demonstrated in this work. The Fe3O4-particles decorated carbon papers were used as the negative electrode for an Fe-air rechargeable battery in both an alkaline aqueous solution system and an all-solid-state system. As for the all-solid-state Fe-air rechargeable battery, KOH-ZrO2 electrolyte powder developed by our group was used in the battery fabrication. In the alkaline aqueous solution based Fe-air rechargeable battery, a high initial discharge capacity of 460 mAh g−1(Fe) was achieved. Meanwhile, in the novel all-solid-state Fe-air rechargeable battery system, an initial discharge capacity of 70 mAh g−1(Fe) was obtained demonstrating the feasibility of this system that could be further developed towards a practical Fe-air rechargeable battery for portable and lightweight device application.

New Opportunities for Air Cathode Batteries; in-Situ Neutron Diffraction Measurements

Batteries with air electrodes are gaining interest as Energy Storage Systems (ESSs) for Electrical Vehicles (EVs) because of their high specific energy density. The electrochemical performance of these batteries is limited by the metallic electrode, which suffers structural transformations and corrosion during cycling that reduces the cycle life of the battery. In this context, relevant information on the discharge products may be obtained by in-situ neutron diffraction, a suitable technique to study electrodes that contain light elements or near neighbor elements in the periodic table. Case studies of MH-air and Fe-air batteries are highlighted.

The effect of Na2S additive in alkaline electrolyte on improved performances of Fe-based air batteries

Fe-based air alkaline batteries are promising candidates for large scale energy storage due to their low cost, eco-friendliness and high energy density. In this work, pure iron was studied as negative electrode of Fe-air batteries with and without Na2S added to the KOH alkaline electrolyte in order to bring new insight on the mechanisms of inhibition of the hydrogen evolution reaction (HER) and improvement of the electrochemical performances of the Fe electrode. Electrochemical (CV, galvanostatic discharge), spectroscopic (XPS, ToF-SIMS) and microscopic (SEM) analysis were applied to characterize the effect of the sulfide additive (Na2S) on the electrochemical behavior of Fe electrodes and their chemical and morphological modifications. Surface analysis performed by XPS and ToF-SIMS revealed the formation of a markedly thicker oxide/hydroxide layer. The mechanism of formation of this thick oxide/hydroxide layer is initiated by the adsorption of sulfur (Sads) at the oxide/metal interface that inhibits the HER during the first stages of electrochemical process and promotes subsequent anodic oxidation. With the Na2S electrolyte additive, Fe(0)/Fe(II) conversion/deconversion is suppressed and charge/discharge proceeds mostly by Fe(II)/Fe(III) conversion/deconversion with improved capacity owing to the porous morphology of the oxide/hydroxide layer.

Annealing effect of amorphous Fe-Si-B-P-Cu precursors on microstructural evolution and redox behavior of nanoporous counterparts

Annealing effect of amorphous Fe83.3Si3B10P3Cu0.7 precursor alloys on the formation of the nanoporous structure and their Redox behavior in alkaline conditions has been investigated. Annealing of amorphous Fe83.3Si3B10P3Cu0.7 alloy causes the formation of nanocrystalline hetero-amorphous microstructure coexisting α-Fe grains and residual amorphous phase. Preferential dissolution of α-Fe grains in H2SO4 solution leads to the formation of nanoporous structure. The nanoporous electrodes due to the larger specific surface area show the better Redox performance than the nonporous counterpart electrodes. The nanoporous electrodes with almost one-order higher peak current densities than nonporous ones can be good candidates of the negative electrodes of Fe-air battery.

A Voltage-Enhanced, Low-Cost Aqueous Iron–Air Battery Enabled with a Mediator-Ion Solid Electrolyte

A new type of aqueous iron–air (Fe–air) battery is demonstrated with an alkaline anode electrolyte (anolyte) and an acidic cathode electrolyte (catholyte). The anolyte and catholyte are separated by an alkali-metal-ion (Li+-ion or Na+-ion) solid-electrolyte separator in which the alkali metal ion serves as an ionic mediator to sustain the redox reactions at the anode and cathode. Coupling the acidic air cathode with the alkaline iron anode demonstrates a voltage-enhanced Fe–air battery. To reduce the cell overpotential, the Fe–air battery is operated with decoupled bifunctional air cathodes comprising an IrO2/Ti (iridium oxide on titanium mesh) electrode for the oxygen evolution reaction and a Pt/C (carbon-supported platinum) electrode for the oxygen reduction reaction.

Solid-Oxide Rechargeable Fe-Air Battery Using Fe Modified with Cr-Ni-PrBaMm2O5 for Low Temperature Operation

Recently, rechargeable battery with large capacity is strongly required for storage electric energy from wind or solar cell power generator. For this purpose, Sodium-surfer (Na-S) battery and redox flow battery are now considered because of the high capacity and efficiency. However, Na-S battery has disadvantage of safety issues because molten Na and S are used. On the other hand, redox flow battery is low energy density. On the other hand, iron is non-toxic, highly safety, and rich in natural resource and compatible for environment. So, solid oxide Fe- air battery is also highly interesting for large scale battery for energy storage. Fe-air solid state rechargeable battery was studied by several groups and this battery is consisted of reversible solid oxide fuel cell and redox media consisting of Fe. By using H2/H2O as a redox mediator, high cycle life is expected. However, up to now, operating temperature of the cell is as high as 1073 K because Y2O3 stabilized ZrO2 is widely used. In our previous study, we investigated the solid state Fe-air battery using LaGaO3electrolyte and reasonable charge and discharge property was demonstrated at 873K. In this study, in order to operate the cell at lower temperature than 773 K from efficiency, catalyst used for Fe oxidation and reduction was investigated and it was found that Fe oxidation can be occurred at much lower temperature by mixing Ce0.6Mn0.3Fe0.1O2 (CMF) and the capacity of 600 Ah kgFe -1, was achieved at 673 K by using CMF mixed Fe powder. However, the capacity is 50% of theoretical capacity and also decreased with cycle number of charge and discharge. Detail analysis of internal resistance suggests that overpotential of fuel electrode became larger with increasing cycle number. In particular, diffusion resistance of the fuel electrode is much increased suggesting that the aggregation of Ni-Fe particle is occurred. Since aggregation of Fe in Ni-Fe fuel electrode seems to be main reason for decreased discharge capacity, Ni mixed with Sm doped CeO2 was applied for fuel electrode. It was found that the cycle stability of charge and discharge was much increased when Ni-SDC was used for anode and discharge capacity of 600 Ah kgFe -1 was stably sustained over 30 cycles. In spite of small degradation of the cell when H2 is used for fuel, discharge potential was still slightly decreased with cycle number and this may suggest that H2 formation rate by oxidation of Fe decreases with cycle number. So, in this study, optimization of catalyst mixed with Fe as energy storage media was further investigated for increased cycle stability of solid state Fe-air battery using LaGaO3based oxide electrolyte. Among the catalysts investigated, stable cyclic redox property of Fe powder was achieved by mixing Cr, Ni, and PrBaMn2O5(PBMO). Fe powder with Cr and Ni and PBMO has high redox rate, stability and high oxidation degree and stable redox property was sustained over 50 cycles at 673 K. By applying Fe powder modified with Cr, Ni, and PBMO, the cell shows reasonably large discharge capacity and stable cyclability. This study reveals that combination of reversible SOFC with Fe modified with 5 wt% Cr-1.5 wt% Ni-1.5 wt% PBMO as an energy storage media is a new type of battery with large capacity.

Effect of Fe2O3 Morphology on the Electrochemical Properties of Fe2O3/C Composite Electrode as Fe-Air Battery Anode

Effect of Fe₂O₃ Morphology on the Electrochemical Properties of Fe₂O₃/C Composite Electrode as Fe-Air Battery Anode

Characteristics of Fe-air battery using Y2O3-stabilized-ZrO2 electrolyte with Ni–Fe electrode and Ba0.6La0.4CoO3-δ electrode operated at intermediate temperature

The charge-discharge operation of a Fe-air battery using YSZ electrolyte at lower temperature was investigated using the NiFe-91 (Ni:Fe=90:10wt%) bimetal electrode as the fuel electrode and the Ba0.6La0.4CoO3-δ (BLC) oxide electrode as the air electrode in this work. It was found that the total resistance of the cell using the NiFe-91 and BLC electrode was about 100 times smaller than that of the cell using the conventional Pt electrode, owing to its significantly small electrode resistance. It was also found that the 10 cycle charge-discharges were achieved at 600°C by using these electrodes, and the capacity of about 700mAh/g-Fe and energy density of 600mWh/g-Fe were also retained during 8 cycles. These results showed a significant potential; the low temperature operation of the battery using YSZ electrolyte is sufficiently possible by choosing an appropriate electrode. However, the low stability of the NiFe-91 electrode, which is due to the agglomeration, was also found in this work.

Fe nanoparticle entrained in tubular carbon nanofiber as an effective electrode material for metal–air batteries: A fundamental reason

Fe nanoparticle entrained in tubular carbon nanofiber (TCNF) as an effective electrode material for metal–air batteries was successfully prepared. TEM and STM investigations revealed that during impregnation Fe precursor ions penetrated into TCNF tubes through factures between the structural units of TCNF, which were absent in commercial carbon nanotube (CCNT). Thus the location of Fe nanoparticles depended on carbon materials: they were in the TCNF tubes and on the surfaces of CCNT. During repeated voltammetric cycles, the Fe nanoparticles in the TCNF tubes evolved to elongated oxygen-lean Fe nanoparticles, while those on CCNT did to oxygen-rich Fe oxide dendrites. Voltammograms of the modified Fe nanoparticles revealed that a higher overpotential was needed for dendrite formation. On the other hand, impedance spectroscopy also disclosed that the mass transfer of soluble Fe species was much faster in the one-dimensional TCNF tubes than in the three-dimensional open spaces between individual CCNTs. Thus, a low overpotential of the redox process of the elongated Fe nanoparticles and the fast mass transfer of soluble Fe species in the TCNF tubes resulted in an increased amount of Fe involved in charging/discharging process, which accounted for the higher efficiency of Fe nanoparticles on TCNF in Fe-air battery system.

Controlled synthesis and characterization of iron oxide micro-particles for Fe-air battery electrode material

In this research, novel homogeneous iron (Fe) oxide particles with the pure α-Fe2O3 structure are successfully synthesized with controlling and shaping via a modified polyol method with NaBH4 as an efficient reducing agent according to drying and heat treatment processes. In the critical synthetic and experimental conditions, large α-Fe2O3 particles exhibited homogeneously large sizes in the certain ranges of 1-5 μm and 1-10 μm, which are regarded as a discovery of controlled and shaped synthesis. The electrochemical measurements indicated that oxide powders containing as-prepared pure α-Fe2O3 microparticles were successfully used in the electrodes. Accordingly, the cyclic voltammetry (CV) and galvanostatic cycling measurements indicated their potential applications for next-generation Fe-air battery technology in comparison with commercial oxide products of Fe2O3 particles. Finally, we suggest that the sharp polyhedral shape and morphology of the engineered micro-particles, such as metal, alloy, and oxide micro-particles, are of importance because they have very high stability and durability with respect to their applied properties.