Low temperature solid oxide electrolytes (LT-SOE): A review

Singh, Bhupendra; Ghosh, Sudipto; Aich, Shampa; Roy, B.

doi:10.1016/j.jpowsour.2016.11.019

Cited by 181 publications

(77 citation statements)

References 336 publications

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“…This result has already been reported for other solid electrolytes and the explanation is simple: higher temperature means lower electrical resistivity and higher amplitude of the electric current, with consequent increased Joule heating, promoting therefore higher densification. An extrapolation to 400 °C of the reported value for the electrical conductivity of the Bi4V1.8Ti0.2O11 composition sintered at 800 °C for 12 h (electrical conductivity at 320 °C, σ320 = 2.56 × 10 −5 S cm −1 , activation energy E = 0.61 eV [32]) leads to σ400 = 1.1 × 10 −4 S cm −1 , which is 25 times lower than the electrical conductivity of our sample flash sintered at 800 °C (2.7 × 10 −3 S cm −1 ). The diagrams are composed of a skewed semicircle at high frequencies due to the bulk resistivity [42] and a spike at lower frequencies due to electrode polarization [43].…”

Section: Resultsmentioning

confidence: 99%

“…BIMEVOX solid electrolytes are obtained by partially replacing V 5+ with pentavalent or aliovalent ions in the Bi 4 V 2 O 11 compound. Several BIMEVOX compounds have been synthesized with single or double replacements with several different metallic ions, Li + , Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , Fe 3+ , Al 3+ , Ti 4+ , Zr 4+ , Ge 4+ , Sn 4+ , Pb 4+ , Nb 5+ [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. The structural phases of Bi 4 V 2 O 11 are monoclinic (named alpha), orthorhombic from 445 • C (beta) and tetragonal from 567 • C (gamma), the gamma phase with the highest oxygen ion conductivity [23,32].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

et al. 2019

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Bi 4 V 1.8 Ti 0.2 O 11 (BITIVOX) ceramic pellets, prepared with powders obtained by a sol gel technique, were sintered either conventionally at 800 • C/8 h or by applying an AC electric voltage, limiting the electric current through the pellets. Electric voltages were applied isothermally at 700 • C and 800 • C during 5 min in the green pellet positioned in the sample holder of a dilatometer for monitoring thickness variation. The BITIVOX pellets shrank 13.6% after applying 200 V cm −1 at 800 • C and 10.4% heating to 800 • C for 8 h. Thermal analysis and X-ray diffraction of the powders were performed to evaluate the crystallization temperature and the structural phase, respectively. The electrical behavior of the sintered BITIVOX pellets was analyzed by the impedance spectroscopy technique, showing that the sample flash sintered at 800 • C/5 min had lower bulk resistivity than the sample conventionally sintered at 800 • C/8 h. The surfaces of the sintered pellets were observed in a scanning electron microscope showing similar grain sizes and pore content in all sintered samples.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

et al. 2019

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“…The doped ceria, such as GDC (Gd 2 O 3 ‐doped ceria) or SDC (Sm 2 O 3 ‐doped ceria), exhibits higher conductivity than YSZ. However, doped ceria is seldom used as electrolyte for SOECs because Ce 4+ can be partially reduced to Ce 3+ in the reducing or electroreducing environment, which brings about high electronic conductivity of ceria electrolyte and results in the short‐circuiting of the cell. An effective solution is coating the ceria electrolyte with a layer of pure ionic conductive electrolyte, such as YSZ or ScSZ to block the electronic conduction of ceria electrolyte…”

Section: Electrolytementioning

confidence: 99%

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

et al. 2019

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which has caused serious global warming. According to Intergovernmental Panel on Climate Change, global warming of 1.5 °C above preindustrial levels will come true by 2055 and bring about severe environmental and ecological issues, [2] such as ocean acidification, sea level rise, and species extinction. Therefore, it is urgently needed to reduce the atmospheric CO 2 concentration. [3] Apart from utilizing renewable energy resources to substitute for fossil fuels, CO 2 capture and storage (CCS) processes, and CO 2 capture and utilization (CCU) processes have been developed to effectively diminish the existing atmospheric CO 2 concentration. [4] The CCS processes are often expensive and laborious, and face the risk of CO 2 leakage, while the CCU processes are able to convert the captured CO 2 to value-added carbon-containing chemicals powered by external energy and has attracted more and more research interests recently. However, the conversion of CO 2 to target products is relatively difficult due to its extremely stable CO bonds. Several approaches for CO 2 conversion have been developed, such as photosynthesis, thermocatalytic reduction, electrochemical reduction, and photochemical conversion. Compared with other approaches, electrochemical reduction is more attractive because of two reasons: 1) electrochemical reduction process is controllable through adjusting the applied voltage and reaction temperature, and 2) the process can utilize renewable energy resources such as wind, solar, hydroelectric, and geothermal energies to electrochemically convert CO 2 to useful chemicals, which forms a carbon-neutral energy cycle and simultaneously provides an efficient storage method for renewable energy resources.Several types of electrolysis cell have been systematically investigated for CO 2 electroreduction as listed in Table 1. The first type operates in H-shaped electrochemical cells with liquid electrolyte at low temperatures (<100 °C).[5] Gaseous CO 2 reactant is dissolved into the liquid electrolyte and transported to the electrode surface, which is subsequently electroreduced to CO, HCOOH, CH 4 , C 2 H 4 , C 2 H 5 OH, and so on. [1,6] Although high Faradaic efficiency of products from CO 2 electroreduction has been achieved by exploring efficient catalysts recently, the current density of CO 2 electrolysis is relatively low due to the low CO 2 solubility and the competitive High-temperature CO 2 electrolysis in solid-oxide electrolysis cells (SOECs) could greatly assist in the reduction of CO 2 emissions by electrochemically converting CO 2 to valuable fuels through effective electrothermal activation of the stable CO bond. If powered by renewable energy resources, it could also provide an advanced energy-storage method for their intermittent output. Compared to low-temperature electrochemical CO 2 reduction, CO 2 electrolysis in SOECs at high temperature exhibits higher current density and energy efficiency and has thus attracted much recent attention. The history of its development and its fundamental mech...

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“…Solid oxide fuel cells (SOFCs) can generate power directly from chemical energy stored in the fuel into electric energy without combustion. One drawback of the state‐of‐art SOFCs is coke depositing on the Ni‐cermet anodes when hydrocarbons are fed, which leads to a fatal destruction of the cell . In recent years, researchers have made several attempts to improve the coking resistance of Ni‐cermet anodes, which are mainly focused on changing the anode composition and fuel composition .…”

Section: Introductionmentioning

confidence: 99%

Improvement of solid oxide fuel cell performance by a core‐shell structured catalyst using low concentration coal bed methane fuel

et al. 2020

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A core-shell structured catalyst Ni-BaO-CeO 2 @SiO 2 (@NBC; 7.87% Ni content) with high catalytic activity and thermal stability is prepared and utilized for partial oxidation of methane. The catalyst is introduced into the Ni-8 mol% Ystabilized ZrO 2 anode of a conventional solid oxide fuel cell (CC) by direct spraying (denoted as P-@NBC//CC) and indirect loading as an independent catalyst layer (denoted as Y-@NBC//CC) to improve the coking resistance and cell stability when low concentration coal bed methane is used. At 800 C, the maximum power density of P-@NBC//CC and Y-@NBC//CC increases bỹ 26.8% and 32.8%, respectively, over that of CC (0.63 W cm −2 ). At a discharge current of 0.16 A at 800 C, the voltage of CC drops to 0 V after 16 hours. In contrast, the voltage of P-@NBC//CC decreases from 0.8 to 0.6 V within 30 hours, and that of Y-@NBC//CC decreases from 0.8 to 0.7 V over 180 hours.The manner of loading of the catalyst layer has a significant effect on the cell stability. The indirect loading mode as an independent catalyst layer has an advantage over the direct spraying method. The postmortem microstructure of the cell reveals that direct spray loading on the anode surface allows the catalyst particles to penetrate into the anode layer and blocks the anode pores, resulting in a lower porosity and higher diffusion resistance. K E Y W O R D Scatalyst layer, coking resistance, methane containing fuels, solid oxide fuel cell

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Low temperature solid oxide electrolytes (LT-SOE): A review

Cited by 181 publications

References 336 publications

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Improvement of solid oxide fuel cell performance by a core‐shell structured catalyst using low concentration coal bed methane fuel

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Low temperature solid oxide electrolytes (LT-SOE): A review

Cited by 181 publications

References 336 publications

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

High‐Temperature CO2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Improvement of solid oxide fuel cell performance by a core‐shell structured catalyst using low concentration coal bed methane fuel

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Product

Resources

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High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects