Pure O2 Atmosphere Research Articles

Monte Carlo Calculation of Electron Energy Degradation in a Pure O2 Atmosphere

Electron degradation serves as a significant energy source in planetary upper atmospheres. In this study, a Monte Carlo model is constructed to investigate the degradation of electrons in a pure O2 atmosphere under the local approximation. Both elastic and inelastic collision processes between electrons and O2 molecules are considered in the model. The yield spectra, characterizing the occurrence of various inelastic collisions for a specified pair of incident and post-collision energies, are obtained from the model. When combined with the information of e-O2 collision cross sections, the yields of each inelastic process are then determined. Furthermore, we derive the mean energy per ion pair and the efficiencies of various inelastic processes, along with the yields of secondary (and higher-order) electrons. The calculations presented here are beneficial for understanding the ionization and heating budgets in planetary atmospheres containing a significant amount of O2 such as Earth and Jovian icy satellites (Europa, Ganymede, and Callisto).

Characterization and antibacterial activity of co-sputtered Cu-doped TiO2 coatings deposited on Ti6Al4V alloy

Copper has gained increased interest because of its important role in metabolism and antimicrobial activity. In this study, composite target material of Ti and Cu was used to deposit TiO2 coatings doped with copper on Ti6Al4V alloy. The aim was to examine the influence of the applied bias during the deposition of Cu-doped TiO2 coating by sputtering in a glow-discharge in a pure O2 atmosphere for a deposition time of 240 min. Different substrate values, selected from 0 to -150 V, were used in the process. The increase in bias voltage from -50 to - 150 V decreased the thickness of the oxide coatings and improved their adhesion to the substrate while increasing the Cu2O phase at the expense of a CuO phase decrease. Simultaneously, the increase in bias voltage decreased Cu content from about 32 wt% for the -50 V biased down to around 11 wt% for the -150 V biased specimens. The antimicrobial efficacy against E. coli estimated by direct contact experiments on the top of the uncoated (control) and coated Ti6Al4V alloy revealed about 94% inhibition for the -50V biased down to around 37% for the -150 V biased coatings as opposed to the control.

Co-sputtered CuO/TiO2 coatings with varying copper content deposited on Ti6Al4V alloy

In this study, mosaic target material of titanium (Ti) and copper (Cu) was used to deposit CuO/TiO2 coatings on Ti6Al4V alloy. The aim was to examine the change in composition, structure and adhesion of the deposited films on titanium alloy when varying the titanium/copper (20:1, 41:1, 179:1, 418:1 and 837:1) ratio of the target material. The coatings were obtained by sputtering in a glow-discharge in a pure O2 atmosphere for a deposition time of 240 min. All coatings showed homogenous Cu distribution and the film thickness decreased with the reduction of Cu content in the composite target. Cu content in the coatings followed a power function of decrease with reduction of Ti-Cu content in the target while the increase of Ti showed logarithmic dependence. In all coatings, anatase and rutile TiO2 phases were detected whereas Cu atoms participated only in the formation of monoclinic CuO. TiO2-rich coatings demonstrated better adhesion to the Ti6Al4V alloy, whereas the critical loads of CuO-rich films were dependent on coating thickness.

(Best Paper Award) Aluminum Josephson Junction Formation on 200mm Wafers Using Different Oxidation Techniques

For superconducting quantum circuits with a large number of Qubits, reproducible components are crucial for reducing entanglement decoherence. Particularly for reliable industrial manufacturing on full-scale 200 mm' wafers, a very high uniformity level is required to ensure sufficient coherence times. In the present work the special focus was put on manufacturing Al/AlOx/Al Josephson junctions (JJ), which are the most important component of many quantum circuit. Fully Al-based CMOS-compatible JJ’s were produced using a double dry etch process. After patterning the first Al metallization several oxidation processes have been investigated.Static oxidation has been performed by first removing the native AlOx in a multi-chamber system with Ar milling. The final tunneling oxide was controlled by applying a specific pressure in the chamber under a pure O2 atmosphere. Afterwards, without breaking the vacuum, the second Al metallization has been deposited by sputtering. Oxide thicknesses between 1 and 2.5 nm were achieved. A full mapping of the process homogeneity will be given.On the other hand, a dynamic recipe controlled plasma oxidation process was performed, where the native AlOx was first removed by a H2 plasma followed by a defined reoxidation with an oxygen plasma. The resulting oxides had thicknesses up to 10 nm. The second Al metallization was again deposited by sputtering.Both oxidation processes were carefully studied to understand the initial oxidation process of the aluminum surface. Special attention was devoted to the non-destructive removal of the native AlOx with respect to the Al interface. Because the oxide thicknesses varied between 1 and 10 nm, the transition between direct and Fowler-Nordheim tunneling could be investigated. The process-stability on full scale 200 mm wafers and on chip size could be determined via test structures as well as the resistance variation of the Josephson junctions. Furthermore, the electrical properties of the different oxides could be measured and analyzed on wafer level. These studies provide insight into the structure and composition of the aluminum oxides and the applicability for Qubits.

Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system

Heterovalent B-site MgO substitution in the Nd2Zr2O7-system (Nd2Zr2−xMgxO7−x) has been explored. The pyrochlores were synthesized by a polymeric sol-gel method and characterized by X-ray diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopy to determine structure, phase composition and microstructure. Impedance Spectroscopy (IS) was employed to study the electrical behavior of the ceramics over the ranges 200–800 °C and under pure N2 and O2. The XRD showed that the solid solution limit was x > 0.02 and all the materials show a cubic Fd3̅m structure. The Raman results confirm the structural disorder created by the introduction of Mg2+ and the subsequent generation of oxygen vacancies. The IS data shows a dramatical increase of the oxide-ion conductivity when doping and that the conductivity depends strongly on the atmosphere, leading to p-type semiconductivity under pure O2 atmosphere. The present study highlights the use of heterovalent dopants to drastically increase the oxide-ion conductivity of pyrochlore-like materials.

Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires

MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. No nanowires were grown in a pure N2 gas atmosphere. Nanowires were formed at oxygen concentrations above 25% in a mixture of N2 and O2 gases. X-ray diffraction analysis showed that the MgO nanowires had a cubic crystal structure. Compared to the nanowires formed at high oxygen concentration, the nanowires grown at low oxygen concentration had larger diameters and rougher side surfaces. Nanowires with very smooth side surfaces were formed at high oxygen concentrations. The difference in surface roughness was supposed to be due to the change in the growth habit of nuclei. Two visible emissions were observed in the cathodoluminescence spectra of the MgO nanowires. One was an emission peak centered near 400 nm and the other was an emission peak with a central wavelength of 500 nm. As the oxygen concentration increased, the emission intensity of the 400 nm band decreased and the emission intensity of the 500 nm band increased. The maximum emission at 500 nm was observed from the nanowires formed in a pure O2 atmosphere. The full width at half maximum of the emission peak at 500 nm was narrower than that of the emission peak at 400 nm.

Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

The regeneration of fluidized catalytic cracking (FCC) catalysts is an essential process in petroleum processing. The current study focused the regeneration reaction characteristics of spent fluidized catalytic cracking catalyst (SFCC) at different atmospheres with influences on pore evolution and activity, for a potential way to reduce emission, produce moderate chemical product (CO), and maintain catalyst activity. The results show that regeneration in air indicates a satisfaction on removing coke on the catalyst surface while giving a poor effect on eliminating the coke inside micropores. This is attributed that the combustion in air led to a higher temperature and further transformed kaolinite phase to silica-aluminum spinel crystals, which tended to collapse and block small pores or expand large pores, with similar results observed in pure O2 atmosphere. Nevertheless, catalysts regenerated in O2/CO2 diminished the combustion damage to the pore structure, of which the micro porosity after regeneration increased by 32.4% and the total acid volume rose to 27.1%. The regeneration in pure CO2 displayed low conversion rate due to the endothermic reaction and low reactivity. The coexistence of gasification and partial oxidation can promote regeneration and maintain the original structure and good reactivity. Finally, a mechanism of the regeneration reaction at different atmospheres was revealed.

Electrochemical properties of double molybdate LiSm(MoO4)2 ceramics with ultra-low sintering temperature

A novel double molybdate LiSm(MoO4)2 composition was prepared through a conventional solid-state ceramic route for its potential application as a solid-state Li+-ion conductor for low-loss dielectric ceramics. Ceramic disks were prepared by uniaxial pressing and sintered at the low temperature of 620 °C. Phase formation was confirmed through powder X-ray diffraction (XRD), which was indexed to the tetragonal crystal system with a Scheelite-type structure. Laser Raman spectroscopy showed that the MoO42− tetrahedra in the LiSm(MoO4)2 material are more regular, suggesting high symmetry for the compound. Scanning Electron Microscopy (SEM) revealed the formation of polygonal grains with an average grain size of less than 1 μm. The electrochemical properties of the ceramic system were investigated by Electrochemical Impedance Spectroscopy (EIS) in O2, air, and Ar (250 °C – 500 °C). Data were systematically analyzed using an Equivalent Circuit Model (EQM) combined with a Distribution Function of Relaxation Times (DFRT) analysis. The results revealed the coexistence of both a delocalized (long-range conductivity) and a localized (dipole relaxation) phenomenon, mainly distinguishable at lower temperatures (i.e., for T ≤ 350 °C) and in a pure O2 atmosphere. This localized phenomenon was tentatively attributed to the presence of trapped hole-vacancy pairs with reduced mobility. Conversely, at higher temperatures in O2 (i.e., for T ≥ 350 °C) and in the whole temperature range in less oxidizing conditions (air and Ar), such a localized phenomenon was no longer observed, as a likely result of a decrease in hole concentration with decreasing oxygen partial pressure (pO2). The current work, thus, underscores a different perspective for the development and characterization of ceramic-based solid-state Li+-ion conductors for their application as low-loss dielectric ceramics.

Improving electrochemical properties of LiNi0.8Mn0.1Co0.1O2 cathode materials for lithium ion batteries by controlling calcination gas atmosphere

Layered lithium nickel manganese cobalt oxides (LiNixMnyCozO2, x + y + z = 1) with high Ni content (x ≥ 0.8), called as high Ni NMC, are one of the most promising cathode materials for lithium-ion batteries of electric vehicle (EV) application. High Ni NMC synthesis includes a calcination step under pure O2 atmosphere to minimize Li/Ni mixing in crystal structure, which highly influences the long term cyclability and C-rate capability of batteries. Herein, we demonstrate that the electrochemical properties of high Ni LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode materials for lithium ion batteries can be further improved by controlling the calcination atmosphere. Interestingly, the results showed that a slightly oxygen deficient calcination atmosphere (mixture of O2/Ar with 96/4 vol% ratio) is effective to provide a stable discharge capacity retention (89%) after 200 cycles, and high C-rate capability (>70% at 20C vs 1C), whereas NMC811 calcined under pure O2 suffers from an excessive oxidation of Ni and Co on the surface and an increase of residual lithium, leading to an increase of surface resistance, as a consequence, a fast capacity fade over cycling and lower C-rate capability. The finding of this study suggests that calcination atmosphere could play a key role in determining the electrochemical properties of high Ni cathode materials, and can also be interesting from the industrial point of view, since producing O2 with a small deficiency (e.g. Ar) needs less efforts in the purification than pure O2.

O2-induced emission color changing/sensing via the combination of red-emitting COF and blue-emitting halogen-bridging Cu(I) phosphor: In-situ synthesis and performance

Covalent organic frameworks (COFs) have shown virtues of structural diversity and porous diversity, due to their versatile organic building blocks. These advantages make COFs a promising host for O2 gas sensors. In this work, a porous COF (denoted as COF-X, X = Br or Cl) having halogen ions (Br or Cl ions) in its micropores was firstly synthesized as host, then Cu clusters [Cu2(PPh3)3X2] were in-situ synthesized. The obtained composite structure was discussed in detail focusing on its photophysical parameters and optical oxygen sensing performance. Probe doping ratio was determined as 2:1 (C162H120N18O12X4@C54H45X2Cu2P3, X = Br or Cl). Host COF-X showed red emission around 628 nm, while probe Cu2(PPh3)3X2 exhibited blue emission around 436 nm with lifetime of 5.21 μs and quantum yield of 0.41 under pure N2 atmosphere. Upon pure O2 atmosphere, probe Cu2(PPh3)3Br2 lifetime and quantum yield were decreased to 1.16 μs and 0.09. Probe emission intensity followed a linear calibration curve with maximum sensitivity of 20.25 (a.u.) and response/recovery time of 9/41 s. This sensitivity was by far the highest one among phosphorescent Cu(I)-based sensors. The relative emission intensity variation between dopant blue emission and host red emission led to an emission color change between blue (under pure N2 atmosphere) and red (under pure O2 atmosphere).

Eye-Visible Oxygen Sensing via In-Situ Synthesizing Blue-Emitting Cu(I) Cluster in Red-Emitting COF: Characterization and Performance.

Covalent organic frameworks (COFs) have shown virtues of well-defined and uniform pores with structural diversity, including the shape, size and even chemical nature of pores. These features are excellent for the application of O2 gas optical sensors. In this paper, two oxygen probes based on halogen-bridged Cu cluster were in-situ synthesized in the micropores of COFs, to allow a uniform distribution. The resulting composite samples were characterized in detail to confirm the successful probe loading. The doping level was determined as ~22%. The halogen-bridged Cu clusters showed blue emission peaking at ~440 nm, while COF host showed red emission peaking at 630 nm. These halogen-bridged Cu clusters had long emissive lifetime of ~6.7 μs and high emission quantum yield of 0.30 in pure N2 atmosphere. Given pure O2 atmosphere, lifetime and quantum yield were quenched to 2.5 μs and 0.11, showing oxygen-sensing possibility. A linear oxygen-sensing calibration curve was observed, with sensitivity of 12.25, response time of 13 s and recovery time of 38 s. Sample emission color was changed from blue to red when testing atmosphere was changed from pure N2 to pure O2, which was detectable by eyes.

Combined TPR, XRD, and FTIR studies on the reduction behavior of Co3O4

The test (Co3O4) and two control cobalt oxides (CoO and Co2O3) were the study materials of the present investigation. The test oxide was a high purity (≥99%) commercial material, but the control oxides were laboratory-prepared. Their chemical composition and structure were determined by X-ray diffractometry and Fourier-transform infrared spectroscopy, thermal stability, and topo-chemical interactivity by thermogravimetry (TG) in pure N2 or O2 atmosphere, hydrogen-reduction behavior, events, and products by non-isothermal and isothermal temperature-programmed reduction measurements. Results obtained show the Co3O4 to assume a normal-spinel-type crystalline structure, which remains thermally stable till the onset of its complete decomposition into CoO (>1050–1200 K) in the N2 atmosphere. In the O2 atmosphere, however, it suffers topo-chemical deoxygenation down to Co3O4-0.024 (≤680 K) succeeded by oxygenation up to Co3O4+0.05 (>680 K) till the immediate vicinity of its bulk decomposition into CoO at the higher temperature regime of 1204–1223 K. Co3O4 is the immediate product of bulk CoO oxidation (at 570–1170 K) or bulk Co2O3 decomposition (480–590 K). The H2-reduction of Co3O4 is shown to occur via five events involving removal of weakly bound surface oxygen species (at 493–680 K), reduction into CoO (703–798 K), reduction of the thus formed CoO into hexagonal and/or cubic crystallites of Co0 via formation (and subsequent reduction) of charged Co5O clusters (853–1100 K), whose peak temperatures were found to depend on the reduction conditions applied. Therefore, impacts of reduction variables (oxide mass, heating rate, and reducing gas composition and flow rate) were systematically examined and found to alter significantly the temperature regimes and rate of the reduction events. Accordingly, the activation energy was calculated for each reduction event and found to impart Co0-inflected autocatalytic effects. Eventually, it is believed that joint Co2+-O2--Co3+ linkages established solely in Co3O4 might be behind the distinctive high thermal stability, O2-inflected topo-chemical activity, and reduction behavior of Co3O4versus CoO and Co2O3. These linkages seem to tolerate reversible redox cycles (Co2+↔ O2− ↔ Co3+), as may be implied from TG-observed cyclic inter-conversion of CoO ↔ Co3O4 ↔ CoO in the O2 atmosphere.

Aerobic Partial Oxidation of Alkanes Using Photodriven Iron Catalysis

Photodriven oxidations of alkanes in trifluoroacetic acid using commercial and synthesized Fe(III) sources as catalyst precursors and dioxygen (O2) as the terminal oxidant are reported. The reactions produce alkyl esters and occur at ambient temperature in the presence of air, and catalytic turnover is observed for the oxidation of methane in a pure O2 atmosphere. Under optimized conditions, approximately 17% conversion of methane to methyl trifluoroacetate at more than 50% selectivity is observed. It is demonstrated that methyl trifluoroacetate is stable under catalytic conditions, and thus overoxidized products are not formed through secondary oxidation of methyl trifluoroacetate.

Hybridizing strategy of decatungstate by Au nanoparticles for enhanced photo-catalytic oxidation of hydrocarbons by dioxygens

Decatungstate (DT) is very potential photo-catalyst for the dioxygens (O2)-based selective oxidation but still needs to be improved in photo-catalytic efficiency and regeneration. This paper discloses that Au nanoparticles (NPs)-loaded DT (Au/DT) is conveniently synthesized via the reduction of chloroauric acids introduced in the synthesis of DT. A series of characterizations and quenching tests support that the doped Au NPs can remarkably improve the visible-light- harvesting and photo-excited quantum efficiencies of DT, and as the excellent electronic transport carriers, they also plays an additional role in converting O2 into the active superoxide (•O2-) anion radical. As a result, the suggested Au/DT exhibits a significantly enhanced photo-catalytic efficiency for the visible-light-triggered selective oxidation of inert hydrocarbons under 25–28 °C and 1 atm pure O2 atmosphere. Under optimized conditions, the best 1%Au/DT achieves 64.2% conversion and 93% acetophenone selectivity in the photo-oxidation of ethylbenzene and it has an outstanding regeneration ability.

A Stable H2O Atmosphere on Europa’s Trailing Hemisphere From HST Images

AbstractPrevious studies of the global intensities of the oxygen emissions at 1,356 Å and 1,304 Å revealed molecular oxygen (O2) in Europa's atmosphere. Here we investigate the relative changes of the two oxygen emissions when Europa emerges from eclipse as well as the radial profiles of the relative emissions across the sunlit disk in Hubble Space Telescope observations taken in 1999, 2012, 2014, and 2015 while the moon was at various orbital positions. The eclipse observation constrains the atomic oxygen (O) column density to or lower. We then find that the OI1356‐Å/OI1304‐Å ratio systematically decreases towards the disk center on the trailing hemisphere. The observed emission ratio pattern and the persistence of it from 1999 to 2015 imply a stable H2O abundance in the central sunlit trailing hemisphere with an H2O/O2 ratio of 12–22. On the leading hemisphere, the emissions are consistent with a pure O2 atmosphere everywhere across the moon disk.

Revealing the solid‐state processing mechanisms of antiferroelectric AgNbO3 for energy storage

AbstractAgNbO3 is one of the prominent lead‐free antiferroelectric (AFE) oxides, which readily exhibits a field‐induced AFE to ferroelectric phase transition and thus a high energy storage density. The solid‐state synthesis of AgNbO3 is considered difficult and an oxidizing atmosphere is typically employed during AgNbO3 processing, on the premise that oxygen can prevent possible decomposition of the silver oxide at high temperatures. However, details about the influence of processing parameters on the functional properties of AFE AgNbO3 are insufficiently understood. In this work, the solid‐state reaction of a stoichiometric AgO and Nb2O5 mixture was investigated. We found that ball milling can convert AgO into metallic Ag, which is beneficial for lowering the reaction temperature for the formation of the perovskite phase to 500‒600℃. Moreover, the influence of the processing atmosphere (air, O2, and N2) was investigated by thermal analysis and in situ X‐ray diffraction. Since the reaction between Ag and Nb2O5 to form AgNbO3 requires oxygen uptake, AgNbO3 was only found to form in air and O2, whereby the kinetics were faster in the latter case. All the sintered AgNbO3 samples exhibited a similar crystallographic structure, although the samples processed in O2 had a lower oxygen vacancy concentration. Despite this, well‐defined AFE double polarization loops were obtained in all cases. Our results indicate that decomposition of sliver oxide during ball milling is beneficial for the solid‐state reaction, while a pure O2 atmosphere is not essential for the synthesis of high‐quality AgNbO3. These findings may simplify the processing and facilitate further research of AgNbO3‐based antiferroelectrics.

Towards efficient oxygen separation from air: Influence of the mean rare-earth radius on thermodynamics and kinetics of reactivity with oxygen in hexagonal Y1-xRxMnO3+δ

It is documented that the mean radius r¯ of rare-earth cations occupying Y1-xRx sublattice in Y1-xRxMnO3+δ hexagonal oxides plays a decisive role in terms of thermodynamics and kinetics of reactivity of the materials with oxygen, and consequently, influences strongly the oxygen storage performance in thermal swing processes conducted in oxygen and air. Y1-xRxMnO3+δ samples with designed r¯ being close to the critical one, at the border of stability between hexagonal- and perovskite-type phases, can reversibly incorporate/release significant amounts of oxygen in pure O2 or air atmospheres, at the moderate temperatures on the order of 200–300 °C. Characteristic temperatures of oxidation and reduction are dependent on r¯, therefore, it is possible to adjust conditions of the temperature swing operation by the chemical doping in Y1-xRxMnO3+δ with larger rare-earth elements. Crucial from a practical point of view, an increase of the oxidation temperature in such compounds greatly enhances the speed of the oxidation process (20 °C increase can reduce half-time of oxidation twice), which is found to be the limiting factor concerning the performance. Based on the comprehensive studies of the physicochemical properties of Y1-xRxMnO3+δ, the optimized Y0.95Pr0.05MnO3+δ composition is proposed, doped only with a small amount of more expensive praseodymium. The material exhibits excellent oxygen storage-related properties and is able for the effective production of oxygen in air by the thermal swing process, utilizing medium-/low-temperature industrial waste heat.

Visible-Light-Driven Methane Conversion with Oxygen Enabled by Atomically Precise Nickel Catalyst

It remains an extreme challenge to activate thermodynamically unfavorable, chemically inert methane molecules under mild conditions. Herein, we report a molecular-like nickel-thiolate hexameric clu...

Development of low‐loss lead‐germanate glass for mid‐infrared fiber optics: I. glass preparation optimization

AbstractReducing the mid‐infrared attenuation loss due to absorption of hydroxyl (OH) groups and scattering of metallic Pb species for lead‐germanate glass is essential to pave the way for their applications as low‐loss mid‐infrared fiber optics. In the first part of this study, we report the understanding of the factors that determine dehydration efficiency and metallic Pb formation during the lead‐germanate glassmelting process. Combining a dry O2‐rich atmosphere containing ultra‐dry N2 together with the use of chloride dehydration agent and nitrate oxidation agent compound was found to enable efficient dehydration effect and absence of metallic Pb scattering sources in the dehydrated glasses. This glassmelting procedure overcomes previous limitations on the preparation of similar kinds of heavy‐metal oxide glasses, where only pure O2 atmosphere was used and/or use of fluoride dehydration agent deteriorated the glass thermal stability. This work provides guidance for developing other low‐loss mid‐infrared glasses/fibers containing multivalent heavy‐metal ions such as Pb, Bi, Te, Sb, etc

A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo4O7+δ for thermochemical cycles

In recent years, oxygen storage materials (OSMs) have been widely used in many fields. It would be particularly important for researchers to design high-oxygen-uptake/release-rate materials. In this study, various synthesis processes were used to successfully synthesize YBaCo4O7+δ and comprehensively investigate their potential applications. Compared with traditional solid-state reaction method and co-precipitation method, the results demonstrated that the utilization of mechanical ball milling treatment on co-precipitated precursors could lead to samples with reversible oxygen uptake/release under an oxidative atmosphere at low temperatures. The resultant materials exhibited fast oxygen absorption/desorption rate that could uptake/release oxygen directly to the equilibrium state within 9 min and 20 min, respectively. The mechanochemically ball-milled sample possessed outstanding oxygen storage performance, which could be attributed to their small particle size, the active outer surface of particles, large specific surface area, and relatively low activation energy. Moreover, the ball-milled sample also exhibited excellent cycling stability during relatively short time spacing. TG results also demonstrated that the ball-milled samples could reversibly uptake/release 2.90 wt.% of excess oxygen (while only 0.70 wt.% for solid-state samples) by adjusting the ambient temperature under pure O2 atmosphere, which would make them promising candidates in various applications. This research demonstrated that mechanical treatment could be an effective strategy to tune the properties and oxygen storage capacity(OSC) performances of YBaCo4O7+δ.