High Electrical Stability Research Articles

Optical Printing of Conductive Silver on Ultrasmooth Nanocellulose Paper for Flexible Electronics

A visible light-induced silver printing technique is applied to patterning flexible electronics on ultrasmooth and transparent nanocellulose paper, as described in article number 2101598 by Xinyu Liu and co-workers. The printed electronic devices possess high conductivity, superior mechanical and electrical stability, and good sustainability.

One-pot synthesis of Cu@porous nitrogen–doped carbon (Cu@PNC) for high-efficiency electromagnetic wave absorption

A series of [email protected] (porous nitrogen–doped carbon) samples was successfully prepared through the reduction of Cu2+/g-C3N4 (graphitic carbon nitride) using magnesium, which was used to construct an efficient electromagnetic wave (EMW) absorber. The Cu content in [email protected] was adjusted by changing the amount of Cu(NO3)2∙3 H2O added. Of the three prepared samples, [email protected] exhibited the best EMW absorption properties; that is, the minimum reflection loss (RLmin) was −79.8 dB (d = 3.7 mm) at 5.93 GHz and the effective absorption bandwidth (RL<−10 dB) was up to 5.1 GHz (d = 1.6 mm), with only 5 wt% filled in paraffin. Copper has high electrical conductivity and chemical stability, and these factors helped to enhance the EMW absorption ability and corrosion resistance of the composites. The EMW absorption ability of [email protected] only changed slightly after soaking in acid (1 M) for 28 days. The findings of this research provide a potential route for preparing a Cu-based acid-resistant EMW absorber.

마그네슘 이차전지의 니켈 표면에서 마그네슘의 전기 화학적 도금 특성 연구

A new and revolutionary rechargeable magnesium battery system has been developed for heavy-road applications such as high performance PEVs. This is a green and safe battery technology, meaning it is environmentally non-toxic and non-explosive. It is also very lightweight and incredibly cheap to produce. Magnesium is the seventh most abundant metal on earth. We believe magnesium metal, which also has high specific capacity of 3833 mAh cm^-3, is another example of a potentially high capacity anode active material for the high energy battery system. Various kinds of Grignard reagent based electrolyte solutions are reported that the electrically deposited magnesium obtained from organomagnesium chloride/AlCl₃ solution in THF showed dendritic morphology in a particular electrolyte composition. In this study, we have optimized the synthetic conditions of Grignard reagents through a mechanochemical process. The structural and electrochemical characteristics of the synthesized Grignard reagents were investigated, using scanning electron microscopy(SEM), cyclic voltammetry(CV) and electrochemical charge-discharge tests. Results showed the Grignard reagents played roles in enhancing the high electrical conductivity and stability of SEI film and in improving cycle stability and cycle life for rechargeable magnesium batteries.

Laser-scribed conductive, photoactive transition metal oxide on soft elastomers for Janus on-skin electronics and soft actuators.

Laser-assisted fabrication of conductive materials on flexible substrates has attracted intense interests because of its simplicity, easy customization, and broad applications. However, it remains challenging to achieve laser scribing of conductive materials on tissue-like soft elastomers, which can serve as the basis to construct bioelectronics and soft actuators. Here, we report laser scribing of metallic conductive, photoactive transition metal oxide (molybdenum dioxide) on soft elastomers, coated with molybdenum chloride precursors, under ambient conditions. Laser-scribed molybdenum dioxide (LSM) exhibits high electrical conductivity, biocompatibility, chemical stability, and compatibility with magnetic resonance imaging. In addition, LSM can be made on various substrates (polyimide, glass, and hair), showing high generality. Furthermore, LSM-based Janus on-skin electronics are developed to record information from human skin, human breath, and environments. Taking advantage of its outstanding photothermal effect, LSM-based soft actuators are developed to build light-driven reconfigurable three-dimensional architectures, reshapable airflow sensors, and smart robotic worms with bioelectronic sensors.

Metal/antiperovskite metal nitride composites Ag/AgNNi3 as novel efficient electrocatalysts for hydrogen evolution reaction in alkaline media

• Antiperovskite metal nitrides Ag x Ni 1- x NNi 3 (0 ≤ x ≤ 0.80) were firstly synthesized and showed novel HER catalysts in alkaline media with high performances. • Metal/antiperovskite metal nitride Ag/Ag 0.80 Ni 0.20 NNi 3 composite electrocatalysts were designed, showing improved performances with a mere 13 mV of onset overpotential and 81 mV of overpotential to reach 10 mA cm −2 , and robust stability. • The results will provide a new type of HER catalysts based on antiperovskite metal nitrides and a strategic design for metal/antiperovskite metal nitride composite electrocatalysts for HER in alkaline media. Searching for effective hydrogen evolution reaction (HER) electrocatalysts is crucial for water splitting. Transition metal nitrides (TMNs) are very attractive potential candidates since of high electrical conductivity, robust stability, element rich and high activity. Antiperovskite metal nitrides provide chemical flexibility since two different types of transition metal elements are contained, allowing partial substitution both for A - and M -sites. Herein, we report a novel antiperovskite metal nitride Ag x Ni 1- x NNi 3 (0 ≤ x ≤ 0.80) thin film used as highly effective HER electrocatalysts. Pure phase antiperovskite nitride can be successfully obtained for Ag x Ni 1- x NNi 3 with x less than 0.80. The Ag 0.76 Ni 0.24 NNi 3 towards HER shows an overpotential of 122 mV at 10 mA cm −2 in alkaline media. Furthermore, considering the role of Ag for adsorbing hydroxyl groups, chemical engineering has been carried out for designing metal/antiperovskite nitride Ag/Ag x Ni 1- x NNi 3 composite electrocatalysts. The 0.18 Ag/Ag 0.80 Ni 0.20 NNi 3 electrocatalyst shows a mere 13 and 81 mV of overpotential to reach 1 and 10 mA cm −2 , respectively, showing high durability in alkaline media. These results will provide a novel type of HER catalysts based on antiperovskite metal nitrides and a strategic design for metal/antiperovskite metal nitride composite electrocatalysts for HER in alkaline media.

ZnO-WS2Nano-heterojunction/ITO photodetector for detection of visible light

Recently, large-area photodetectors fabricated with low-cost techniques have gained tremendous attention. Herein, efforts have been made to study the photodetector parameters for different concentration variations of the ZnO-WS2 heterostructure. The device was fabricated using a drop-casting method on an ITO glass substrate with a large area channel width. It has higher electrical stability and stable photoresponse with Responsivity ∼10.6 mA/W, Detectivity ∼1011 Jones and EQE% ∼1.96% under 670 nm with an intensity of 110 μW/cm2illumination at bias 5 V, respectively. Present findings will advocate the huge development of simple, low-cost and large-area photodetectors with high performance in the nearest future.

Simultaneous Reduction of Proton Conductivity and Enhancement of Oxide-Ion Conductivity by Aliovalent Doping in Ba7Nb4MoO20.

Hexagonal perovskite-related oxides have garnered a great deal of research interest because of their high oxide-ion conductivity at intermediate temperatures, with Ba7Nb4MoO20 being a notable example. However, concomitant proton conduction in Ba7Nb4MoO20 may cause a decrease in power efficiency when used as the electrolyte in conventional solid oxide fuel cells. Here, through investigations of the transport and structural properties of Ba7Nb4-xWxMoO20+x/2 (x = 0-0.25), we show that the aliovalent substitution of Nb5+ by W6+ not only increases the oxide-ion conductivity but also dramatically lowers proton conductivity. The highest conductivity is achieved for x = 0.15 composition, with 2.2 × 10-2 S cm-1 at 600 °C, 2.2 times higher than that of pristine Ba7Nb4MoO20. The proton transport number of Ba7Nb3.85W0.15MoO20.075 is smaller compared with Ba7Nb4MoO20, Ba7Nb3.9Mo1.1O20.05, and Ba7Ta3.7Mo1.3O20.15. The structure analyses of neutron diffraction data of Ba7Nb3.85W0.15MoO20.075 at 25 and 800 °C reveal that the aliovalent W6+ doping introduces interstitial oxide ions in the intrinsically oxygen-deficient c' layers, thereby simultaneously increasing the carrier concentration for oxide-ion conduction and decreasing oxygen vacancies responsible for dissociative absorption of water. Neutron scattering length density distribution was examined using the maximum-entropy method and neutron diffraction data at 800 °C, which indicates the interstitialcy oxide-ion diffusion in the c' layers of Ba7Nb3.85W0.15MoO20.075. Ba7Nb3.85W0.15MoO20.075 exhibits extremely high chemical and electrical stability in the wide oxygen partial pressure P(O2) region [ex. 10-23 ≤ P(O2) ≤ 1 atm at 903 °C]. The present results offer a strategy for developing pure oxide-ion conducting hexagonal perovskite-related oxides for possible industrial applications.

Functionalized Gold Nanoparticles with a Cohesion Enhancer for Robust Flexible Electrodes.

The development of conductive inks is required to enable additive manufacturing of electronic components and devices. A gold nanoparticle (AuNP) ink is of particular interest due to its high electrical conductivity, chemical stability, and biocompatibility. However, a printed AuNP film suffers from thermally induced microcracks and pores that lead to the poor integrity of a printed electronic component and electrical failure under external mechanical deformation, hence limiting its application for flexible electronics. Here, we employ a multifunctional thiol as a cohesion enhancer in the AuNP ink to prevent the formation of microcracks and pores by mediating the cohesion of AuNPs via strong interaction between the thiol groups and the gold surface. The inkjet-printed AuNP electrode exhibits an electrical conductivity of 3.0 × 106 S/m and stable electrical properties under repeated cycles (>1000) of mechanical deformation even for a single printed layer and in a salt-rich phosphate-buffered saline solution, offering exciting potential for applications in flexible and 3D electronics as well as in bioelectronics and healthcare devices.

Ultralow thermal conductivity and anharmonic rattling in two-dimensional WB4 monolayer

Two-dimensional (2D) WB4 monolayer is a typical graphene analog with high electrical conductivity and structural stability. Yet, its thermal transport properties are not available. By using first-principles calculations and iteratively solving the linearized Boltzmann transport equation, we predict an ultralow in-plane lattice thermal conductivity (κlat) of 0.28 W/m K at T = 300 K. Such an ultralow κlat is attributed to WB4 monolayer's predominantly large phonon scattering rates and flat acoustic phonon dispersion caused by strong anharmonicity. By analyzing the vibrational patterns and bonding environment, we confirm the origin of the strong anharmonicity to be tungsten atom rattling inside the framework of two boron sheets. Such a mechanism fulfills the concept of phonon glass-electron crystal, making the WB4 monolayer an outstanding 2D thermoelectric material. The rich formation mechanism, including multiple interactions in the WB4 monolayer, provides us inspiration for searching for materials with ultralow κlat.

Printed Low-Cost PEDOT:PSS/PVA Polymer Composite for Radiation Sterilization Monitoring.

During the γ-radiation sterilization process, the levels of radiation exposure to a medical device must be carefully monitored to achieve the required sterilization without causing deleterious effects on its intended physical and chemical properties. To address this issue, here we have demonstrated the development of an all-printed disposable low-cost sensor that exploits the change in electrical impedance of a semi-interpenetrating polymer network (SIPN) composed of poly(vinyl alcohol) (PVA) and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) as a functional polymer composite for radiation sterilization monitoring applications. Specifically, the PEDOT:PSS acts as the electrically conductive medium, while the PVA provides the ductility and stability of the printed sensors. During irradiation exposure, chain scission and cross-linking events occur concurrently in the PEDOT:PSS and PVA polymer chains, respectively. The concurrent scissoring of the PEDOT polymer and cross-linking of the PVA polymer network leads to the formation of a stable SIPN with reduced electrical conductivity, which was verified through FTIR, Raman, and TGA analysis. Systematic studies of different ratios of PEDOT:PSS and PVA mixtures were tested to identify the optimal ratio that provided the highest radiation sensitivity and stability performance. The results showed that PEDOT:PSS/PVA composites with 10 wt % PVA produced sensors with relative impedance changes of 30% after 25 kGy and up to 370% after 53 kGy (which are two of the most commonly used radiation exposure levels for sterilization applications). This composition showed high electrical impedance stability with less than ±5% change over 18 days after irradiation exposure. These findings demonstrate the feasibility of utilizing a printing technology for scalable manufacturing of low-cost, flexible radiation sensors for more effective monitoring of radiation sterilization processes.

Plasma-assisted three-dimensional lightscribe graphene as high-performance supercapacitors

Graphene-based supercapacitors demonstrate extraordinary energy storage capacity due to their layered structure, large effective surface area, high electrical conductivity and acceptable chemical stability. Herein, reduced graphene oxide (rGO)-based supercapacitors were introduced in a simple, and fast method with considerable performance. For this purpose, graphene oxide (GO) was synthesized by the modified Hummers’ method and then easily reduced to desired patterns of rGO using a commercial LightScribe DVD drive. In order to increase the effective surface area, as well as the electrical conductivity of rGO layers, oxygen/sulfur hexafluoride plasma was applied to the rGO followed by laser irradiation. By performing such sequential processes, an rGO-based supercapacitor was introduced with a capacitance of about 10.2 F/cm3, which had high stability for more than 1000 consecutive charge–discharge cycles. The fabrication steps of the electrodes were investigated by different analyses such as SEM, TEM, Raman, surface resistance, BET, and XPS measurements. Results showed that these rGO-based electrodes fabricated by sequential processes are very interesting for practical applications of energy storage.

Improved oxide-ion conductivity by substitution of Sr for Bi in Dion-Jacobson phase CsBi2Ti2NbO10

Oxide ion conducting ceramics have attracted much attention due to their various applications such as solid oxide electrolysis cells (SOECs) and solid-oxide fuel cells (SOFCs). Herein, we present the first report on the preparation, electrical and structural properties of oxide-ion conducting Dion-Jacobson phases CsBi1.9M0.1Ti2NbO9.95 (M = Mg, Ca, Sr and Ba). It was found that partial substitution of Bi3+ by Sr2+ improves the conductivity of CsBi2Ti2NbO10. The electrical conductivity of CsBi1.9Sr0.1Ti2NbO9.95 is approximately 2 times higher than that of CsBi2Ti2NbO10 at 600–900 °C and is 1.65 × 10−2 S cm−1 at 900 °C. The improvement of oxide-ion conductivity in CsBi1.9Sr0.1Ti2NbO9.95 can be attributed to the increase of the carrier (oxygen vacancy) concentration and small size mismatch between the dopant Sr and host Bi cations. The electrical conductivities of CsBi1.9Sr0.1Ti2NbO9.95 are almost constant in the oxygen partial pressure region from 10−25 to 1 atm at 600 °C, indicating the predominant oxide-ion conduction and high chemical and electrical stability. Bond-valence-based energy landscapes of a test oxide ion in CsBi1.9Sr0.1Ti2NbO9.95 suggest that oxide ions migrate along the edges of the octahedra in the inner perovskite layers, leading to two-dimensional oxide-ion diffusion. This study demonstrates the successful improvement of oxide-ion conductivity by the substitution in Dion-Jacobson phase, which would develop the science and technology of Dion-Jacobson type oxide-ion conductors.

1T-MoS2 monolayer as a promising anode material for (Li/Na/Mg)-ion batteries

Transition metal sulfide with high electrical conductivity and thermal stability has been considered as a promising anode candidate for rechargeable batteries. Among them, 1T-MoS2 nanosheet with a honeycomb structure like graphene, has attracted increasing attention recently due to its excellent electrochemical performance. In this paper, the density functional theory calculations have been employed to investigate and compare the interaction of Li, Na, K, Mg, and Al with the 1T-MoS2 monolayer, including the geometry configurations, electronic structures, ions diffusion properties, open-circuit voltages, and specific theoretical capacities. All metal atoms adsorbed on 1T-MoS2 monolayer with negative adsorption energies, indicating strong binding between metals and 1T-MoS2 monolayer and in favor of battery application. The diffusion barriers of all metal ions are less than 0.2 eV, indicating good charge–discharge rates. The OCV range of 1T-MoS2 as Li-ion, Na-ion and Mg-ion batteries anodes is around 0.2 ∼ 0.8 V, and the specific capacities are 1172, 335, and 670 mAh/g, respectively. Our results indicate that the high capacity, low open-circuit voltage, and ultrahigh ion diffusion kinetics make the 1T-MoS2 an excellent candidate as anode material for Li-ion batteries, Na-ion batteries and Mg-ion batteries.

Functional incorporation of the insect odorant receptor coreceptor in tethered lipid bilayer nanoarchitectures

Membrane proteins are among the most important drug targets. To improve drug design, it is critical to study membrane proteins. However, due to the myriad roles fulfilled by the cellular membrane, it is a highly complex environment and challenging to study. Tethered membranes reproduce the basic physicochemical properties of the cellular membrane without its inherent complexity. The high electrical resistance and stability makes them ideal to study membrane proteins, particularly ion channels. However, due to the close proximity of the membrane to the support and the reduced fluidity and high packing density, they are unsuitable to study larger membrane proteins. We present here a tethered membrane system which adresses these challenges, allowing the functional reconstitution of the odorant receptor coreceptor from Drosophila melanogaster, a tetrameric ionotropic receptor was incorporated and its sensitivity to various ligands was examined via electrochemical impedance spectroscopy and atomic force microscopy.

Effect of cryogenic treatment on mechanical behavior of PALF reinforced polymer composite

Fiber-reinforced polymer composites find its applications in various fields like aerospace, automobile, marine, electrical, manufacturing and civil engineering etc. Most of these applications demands for the materials with very high strength, structural stability, very high thermal and electrical stability etc. This triggers most of the researchers to focus their attention on finding the newer methods to improve the properties of the composite. The main objective of this work is to investigate the effect of cryogenic treatment and the duration of treatment on the mechanical behavior of PALF reinforced polymer composite. The PALF reinforced composite samples were subjected to cryogenic treatment by dipping in liquid nitrogen for different duration of time. The samples were removed from the liquid nitrogen container after treated for different duration of time in steps of 1 h. Removed samples were allowed to attain room temperature before testing for mechanical properties. The maximum tensile strength of 46.04 MPa with a modulus of 4.67GPa and the maximum flexural strength of 107.96 MPa with a flexural modulus of 4.63GPa was obtained for the specimen cryogenically treated for 10 h. The tensile and flexural strength were almost increased by 84.16% and 71.71% respectively when compared to the untreated specimen. Further increase in the duration of treatment decreases the tensile and flexural strength of the composite. The present work highlights that cryogenic treatment greatly influences the mechanical behavior of PALF reinforced polymer composite.

Can Charge-Modulated Metal-Organic Frameworks Achieve High-Performance CO2 Capture and Separation over H2 , N2 , and CH4 ?

CO2 capture and separation by using charge-modulated adsorbent materials is a promising strategy to reduce CO2 emissions. Herein, three TM-HAB (TM=Co, Ni, and Cu; HAB=hexa-aminobenzene) metal-organic frameworks (MOFs) were evaluated as charge-modulated CO2 capture and separation materials by using density functional theory and grand canonical Monte Carlo simulations. The results showed that each TM-HAB presented a high electrical conductivity and structural stability when injecting charges. The CO2 adsorption energy increased from 0.211 to 2.091 eV on Co-HAB, 0.262 to 2.119 eV on Ni-HAB, and 0.904 to 2.803 eV on Cu-HAB, respectively, with the increase in charge state from 0.0 to 3.0 e- . Co-HAB and Ni-HAB were better charge-modulated CO2 capture materials with less structure deformation based on energy decomposition analyses. The kinetic process demonstrated that considerably low energy consumptions of 0.911 and 1.589 GJ ton-1 CO2 were observed for a complete adsorption-desorption cycle on Co-HAB and Ni-HAB. All charged MOFs, especially Co-HAB and Ni-HAB, exhibited higher CO2 adsorption energies and adsorption capacities than those of H2 , N2 , and CH4 , thereby exhibiting high CO2 selectivities. Interaction analysis confirmed that the injecting charges had a more pronounced enhancement in the coulombic interactions between CO2 and MOFs. The results of this work highlight Co-HAB and Ni-HAB as promising charge-modulated CO2 capture and separation materials with controllable CO2 capture, high selectivity, and low energy consumption.

Development of electrically conductive ZrO2-CaO-Fe2O3-V2O5 glass and glass-ceramics as a new cathode active material for Na-ion batteries with high performance

Glass-ceramics xZrO2•10Fe2O3•(90-x)V2O5 with ‘x’ between 0 and 30 mol% and yZrO2･(20-y)CaO･10Fe2O3･70 V2O5 glass with ‘y’ between 0 and 20 mol%, respectively abbreviated as xZFV and yZCFV, before and after heat treatment at 500 °C for 100 min, were evaluated as potential cathode-active materials for sodium-ion batteries (SIBs). Relationships between physical properties and local structure of xZFV and yZCFV glass-ceramics were investigated by 57Fe-Mössbauer spectroscopy, V K-edge X-ray absorption near edge structure (XANES), X-ray diffractometry (XRD), DC four-probe method and differential thermal analysis (DTA). SIBs containing heat-treated xZFV glass-ceramics showed the highest discharge capacity of 153 mA h g−1 under a current density of 50 mA•g−1, which exhibited a high electrical conductivity of 1.8 × 10−2 Scm−1. Precipitation of V0.05Zr0.95O2 and Fe2V4O13 nanoparticles were confirmed from the XRD pattern of the heat-treated 20ZFV glass, consistent with the lower energy of the pre-edge peak at 5467 eV in the V K-edge XANES spectrum. This result is associated with the reduction of vanadium ions from VV to VIV. It is concluded that the precipitation of stable vanadium bronze phases with high electrical conductivity and structural stability effectively enable the high SIB capacity of these materials.

Influence of Untreated Metal Waste from 3D Printing on Electrical Properties of Alkali-Activated Slag Mortars

The negative environmental impact of cement production emphasizes the need to use alternative binders for construction materials. Alkali-activated slag is a more environmentally friendly candidate which can be utilized in the design of mortars with favorable material properties. However, the electrical properties of such materials are generally poor and need to be optimized by various metallic or carbon-based admixtures to gain new sophisticated material functions, such as self-sensing, self-heating, or energy harvesting. This paper investigates the influence of waste metal powder originating from the 3D printing process on the material properties of alkali-activated slag mortars. The untreated metal powder was characterized by means of XRD and SEM/EDS analyses revealing high nickel content, which was promising in terms of gaining self-heating function due to the high electrical conductivity and stability of nickel in a highly alkaline environment. The designed mortars with the waste metal admixture in the amount up to 250 wt.% to the slag and aggregates were then characterized in terms of basic physical, thermal, and electrical properties. Compared to the reference mortar, the designed mortars were of increased porosity of 17–32%. The thermal conductivity of ~1–1.1 W/m·K was at a favorable level for self-heating. However, the electrical conductivity of ~10−6 S/m was insufficient to allow the generation of the Joule heat. Even though a high amount of 3D printing waste could be used due to the good workability of mixtures, its additional treatment will be necessary to achieve reasonable, effective electrical conductivity of mortars resulting in self-heating function.

Recovery of Au from dilute aqua regia solutions via adsorption on the lyophilized cells of a unicellular red alga Galdieria sulphuraria: A mechanism study

The high electrical conductivity, chemical stability, and low toxicity of elemental Au make it a highly valuable resource. However, wastewater produced during the mining, utilization, and disposal of Au inevitably contains small amounts (10–40 mg L−1) of Au, thus posing environmental risks. It is too acidic to be treated with inexpensive and eco-friendly bioadsorbents previously studied for the remediation of less acidic effluents. Herein, lyophilized Galdieria sulphuraria cells are shown to directly adsorb Au from simulated Au-containing wastewater with a total acid concentration of 4 M, achieving an adsorption capacity of 35 ± 2.5 mg g−1 Au after 30-min exposure and a selectivity that exceeds that of an ion-exchange resin and is comparable to that of activated carbon. Additionally, Au adsorbed on these cells is more easily eluted than that adsorbed on the ion-exchange resin or activated carbon. Detailed characterizations reveal that Au accumulates on the surface of lyophilized cells, where it is mainly present as AuCl4− and not as Au0, in contrast to a previously proposed adsorption mechanism. Thus, our work provides valuable insights into the mechanism of Au adsorption on biomaterials and paves the way to the cheap and eco-friendly recovery of Au from acidic wastewater.

Oxide-ion and proton conductivity of the ordered perovskite BaY1/3Ga2/3O2.5

Oxide-ion and proton conductors have a variety of applications such as solid-oxide fuel cells (SOFCs). Here we report BaY1/3Ga2/3O2.5 as a new structural-type mixed oxide-ion and proton conductor. Rietveld refinement of neutron-diffraction data indicated that BaY1/3Ga2/3O2.5 is a Ga/Y-cation- and O/VVO×-anion-ordered perovskite-related oxide with the large amount of ‘intrinsic oxygen vacancy’ VVO× (16.7%), which was supported by bond-valance sums (BVSs) and ab initio DFT structural optimization. Temperature and oxygen partial pressure dependencies of electrical conductivity of BaY1/3Ga2/3O2.5 in dry and wet atmospheres indicated that this compound exhibits high chemical and electrical stability and belongs to a new structure family of oxide-ion and proton conductors.