Remarkable chemical adsorption of manganese-doped titanate for direct carbon dioxide electrolysis

2014 ◽  
Vol 2 (19) ◽  
pp. 6904-6915 ◽  
Author(s):  
Wentao Qi ◽  
Yun Gan ◽  
Di Yin ◽  
Zhenyu Li ◽  
Guojian Wu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Vacancies ◽  
Solid Oxide ◽  
Chemical Adsorption ◽  
Adsorption Of Co ◽  
Significant Concentration

Remarkable chemical adsorption of CO2 has been achieved in titanate with significant concentration of oxygen vacancies towards the efficient direct CO2 electrolysis in solid oxide electrolysers.

Oxygen vacancies-rich iron-based perovskite-like electrodes for symmetrical solid oxide fuel cells

2021 ◽  
Author(s):  
Yihan Ling ◽  
Tian Li ◽  
Yang Yang ◽  
Yunfeng Tian ◽  
Xinxin Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Vacancies ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Iron Based

scholarly journals Selective capture of carbon dioxide from hydrocarbons using a metal-organic framework

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Omid T. Qazvini ◽  
Ravichandar Babarao ◽  
Shane G. Telfer
Keyword(s):  
Carbon Dioxide ◽  
Density Functional ◽  
Metal Organic Framework ◽  
Density Functional Theory Calculations ◽  
Time Lags ◽  
X Ray Crystallography ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
Short Time ◽  
Organic Framework

AbstractEfficient and sustainable methods for carbon dioxide capture are highly sought after. Mature technologies involve chemical reactions that absorb CO2, but they have many drawbacks. Energy-efficient alternatives may be realised by porous physisorbents with void spaces that are complementary in size and electrostatic potential to molecular CO2. Here, we present a robust, recyclable and inexpensive adsorbent termed MUF-16. This metal-organic framework captures CO2 with a high affinity in its one-dimensional channels, as determined by adsorption isotherms, X-ray crystallography and density-functional theory calculations. Its low affinity for other competing gases delivers high selectivity for the adsorption of CO2 over methane, acetylene, ethylene, ethane, propylene and propane. For equimolar mixtures of CO2/CH4 and CO2/C2H2, the selectivity is 6690 and 510, respectively. Breakthrough gas separations under dynamic conditions benefit from short time lags in the elution of the weakly-adsorbed component to deliver high-purity hydrocarbon products, including pure methane and acetylene.

Adjusting surface oxygen vacancies prompted perovskite as high performance cathode for solid oxide fuel cell

2021 ◽  
Vol 865 ◽  
pp. 158746
Author(s):  
Yongchao Niu ◽  
Xiaoju Yin ◽  
Chengzhi Sun ◽  
Xueqin Song ◽  
Naiqing Zhang
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
High Performance ◽  
Oxygen Vacancies ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Surface Oxygen

scholarly journals Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4148 ◽  
Author(s):  
Cristina Artini ◽  
Sabrina Presto ◽  
Sara Massardo ◽  
Marcella Pani ◽  
Maria Maddalena Carnasciali ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Oxygen Vacancies ◽  
Arrhenius Plot ◽  
Solid Oxide ◽  
Raman Shift ◽  
Threshold Temperature ◽  
Doped Ceria ◽  
Lower Activation ◽  
Slope Change ◽  
Heavily Doped

Transport and structural properties of heavily doped ceria can reveal subtle details of the interplay between conductivity and defects aggregation in this material, widely studied as solid electrolyte in solid oxide fuel cells. The ionic conductivity of heavily Gd-doped ceria samples (Ce1−xGdxO2−x/2 with x ranging between 0.31 and 0.49) was investigated by impedance spectroscopy in the 600–1000 K temperature range. A slope change was found in the Arrhenius plot at ~723 K for samples with x = 0.31 and 0.34, namely close to the compositional boundary of the CeO2-based solid solution. The described discontinuity, giving rise to two different activation energies, points at the existence of a threshold temperature, below which oxygen vacancies are blocked, and above which they become free to move through the lattice. This conclusion is well supported by Raman spectroscopy, due to the discontinuity revealed in the Raman shift trend versus temperature of the signal related to defects aggregates which hinder the vacancies movement. This evidence, observable in samples with x = 0.31 and 0.34 above ~750 K, accounts for a weakening of Gd–O bonds within blocking microdomains, which is compatible with the existence of a lower activation energy above the threshold temperature.

Stability and Transport Conductivity of Perovskite Type BaZrxCe0.8-xNd0.2O3-δ

2012 ◽  
Vol 554-556 ◽  
pp. 404-407 ◽  
Author(s):  
Shi Jing Zhan ◽  
Xue Feng Zhu ◽  
Wei Ping Wang ◽  
Wei Shen Yang
Keyword(s):  
Carbon Dioxide ◽  
Fuel Cell ◽  
Citric Acid ◽  
Solid Oxide Fuel Cell ◽  
Chemical Stability ◽  
High Conductivity ◽  
Solid Oxide ◽  
Good Stability ◽  
Oxide Fuel ◽  
Perovskite Type

Solid oxide components such as electrolyte for solid oxide fuel cell require chemical stability and high conductivity. Substituting Zr for Ce in BaCe0.8Nd0.2O3-δ improves the chemical stability but reduces conductivity. The objective of this work was to study the optimization of conductivity and chemical stability by changing the ratio of Ce to Zr in BZCN. Perovskite type BaZrxCe0.8-xNd0.2O3-δ (BZCN) powders were prepared by an EDTA–citric acid (EC) process. BaZrxCe0.8-xNd0.2O3-δ (x≥0.4) oxides show good chemical stability against carbon dioxide. The conductivities of sintered samples increased with the temperature and decrease with their Zr content. The good chemical stability and conductivity of BaZr0.4Ce0.4Nd0.2O3-δ is potential to be practically used with both high conductivity and good stability

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