Diverse Functions of Oxygen Vacancies for Oxygen Ion Conduction

Cai, Hong; Chen, Xia; Wang, Xunying; Dong, Wenjing; Xiao, Haibo; Zheng, Dan; Wang, Hao; Wang, Baoyuan

doi:10.1021/acsaem.2c01718

Cited by 17 publications

(2 citation statements)

References 43 publications

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“…O L represents lattice oxygen constituting SnO 2 , O V signifies the oxygen vacancy, and O C denotes the oxygen that is chemically adsorbed or dissociated from water vapor. 14 In addition, from the peak area of the three oxygen species, the proportion of O V was obviously not low, indicating that there were still a large number of oxygen vacancies on the surface of the material. To further substantiate and compare the oxygen vacancy content of each sample, electron paramagnetic resonance (EPR) tests were conducted, as shown in Figures 2c and S7.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Wang,

Xing,

Zhai

et al. 2024

ACS Sens.

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Large emissions of nitrogen dioxide (NO2) pose a significant threat to human health, Monitoring its content and implementing timely measures are crucial. Utilizing oxide semiconductors, such as tin dioxide (SnO2), has proven to be an effective way to detect and analyze NO2. The design and preparation of sensing materials with high sensitivity and excellent selectivity is the key to improve the detection efficiency. SnO2 nanopowders with small and uniform particle size, large specific surface area, adjustable defect content, and no impurities were prepared by a new plasma spraying method. The SnO2 nanopowders exhibit outstanding performance in detecting NO2 at a low temperature of 100 °C, the response to 5 ppm of NO2 reaches 48, and the material demonstrates rapid response and recovery times, coupled with excellent selectivity. The exceptional gas-sensitive properties can be attributed to the superior morphology and structure of SnO2. It provides more reaction sites for gas sensitive reactions, fast electron transport, a large number of charge carriers, and improved adsorption of the material to the target gas. This study provides valuable insights into nanomaterial preparation and the enhancement of gas-sensitive properties for SnO2.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Wang,

Xing,

Zhai

et al. 2024

ACS Sens.

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“…[ 31,32 ] Based on the oxygen vacancy conduction mechanism, the amorphous structure of NLO film could assist faster Li + ion transport at the electrode‐electrolyte interface. [ 33–36 ] The thickness dependence of NLO films was assessed (Figure S3, Supporting Information), revealing that the NLO film with a thickness of 20 µm exhibited the most favorable overpotential and stability. This finding is consistent with the current density–time response curve, which demonstrated stable growth of the NLO film after 300 s. Hence, the observed superior performance of the 20 µm thick NLO film provides strong support for the stability indicated by the current density‐time response curve.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen‐Doped Anodic Li Oxide Films as Robust Li Metal Anodes and Solid‐State Electrolytes

Fan,

Kim,

Chen

et al. 2024

Advanced Energy Materials

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The performance of the lithium (Li) metal anode in rechargeable batteries has been hampered by the formation of unstable solid‐electrolyte interphase layers, which compromise cycle life and pose significant safety concerns. Herein, for the first time, the anodizing oxidation of pure Li in a liquid electrolyte is developed by using tetrahydrofuran with LiNO3. With this novel process, thickness‐controllable Li oxide films with in situ nitrogen doping during the anodizing process can be obtained. The resulting nitrogen‐doped Li oxide film (NLO) exhibits a uniform surface of the Li metal anode, effectively suppressing Li dendrite growth and simultaneously improving Li ionic conductivity. In addition, the Li metal full cells with Li/NLO anodes perform a long stable life of 1100 cycles at 5C. More importantly, this work demonstrates the great potential of NLO films as a solid‐state electrolyte in solid‐state Li metal batteries. The symmetric Li cells with NLO films perform excellent cycling stability for 300 h at 2 mA cm−2 current density and high Li+ ion conductivity of ≈3 ×10−4 S cm−1 at room temperature. This research not only provides a novel Li anodizing process and a stable Li metal anode but also opens up new possibilities for new solid‐state Li metal battery technologies.

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Observation of Fast Low‐Temperature Oxygen Ion Conduction in CeO₂/β"‐Al₂O₃ Heterostructure

Zhang,

Zhu,

Zhao

et al. 2024

Advanced Science

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Semiconductor ion fuel cells (SIFCs) have demonstrated impressive ionic conductivity and efficient power generation at temperatures below 600 °C. However, the lack of understanding of the ionic conduction mechanisms associated with composite electrolytes has impeded the advancement of SIFCs toward lower operating temperatures. In this study, a CeO2/β″‐Al2O3 heterostructure electrolyte is introduced, incorporating β″‐Al2O3 and leveraging the local electric field (LEF) as well as the manipulation of the melting point temperature of carbonate/hydroxide (C/H) by Na+ and Mg2+ from β″‐Al2O3. This design successfully maintains swift interfacial conduction of oxygen ions at 350 °C. Consequently, the fuel cell device achieved an exceptional ionic conductivity of 0.019 S/cm and a power output of 85.9 mW/cm2 at 350 °C. The system attained a peak power density of 1 W/cm2 with an ultra‐high ionic conductivity of 0.197 S/cm at 550 °C. The results indicate that through engineering the LEF and incorporating the lower melting point C/H, there approach effectively observed oxygen ion transport at low temperatures (350 °C), effectively overcoming the issue of cell failure at temperatures below 419 °C. This study presents a promising methodology for further developing high‐performance semiconductor ion fuel cells in the low temperature range of 300–600 °C.

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Diverse Functions of Oxygen Vacancies for Oxygen Ion Conduction

Cited by 17 publications

References 43 publications

Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Nitrogen‐Doped Anodic Li Oxide Films as Robust Li Metal Anodes and Solid‐State Electrolytes

Observation of Fast Low‐Temperature Oxygen Ion Conduction in CeO₂/β"‐Al₂O₃ Heterostructure

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Diverse Functions of Oxygen Vacancies for Oxygen Ion Conduction

Cited by 17 publications

References 43 publications

Defect Engineering for SnO2 Improves NO2 Gas Sensitivity by Plasma Spraying

Defect Engineering for SnO2 Improves NO2 Gas Sensitivity by Plasma Spraying

Nitrogen‐Doped Anodic Li Oxide Films as Robust Li Metal Anodes and Solid‐State Electrolytes

Observation of Fast Low‐Temperature Oxygen Ion Conduction in CeO2/β"‐Al2O3 Heterostructure

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Product

Resources

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Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Defect Engineering for SnO₂ Improves NO₂ Gas Sensitivity by Plasma Spraying

Observation of Fast Low‐Temperature Oxygen Ion Conduction in CeO₂/β"‐Al₂O₃ Heterostructure