scholarly journals Electrochemical p erformance  of La2NiO4+δ-Ce0.55La0.45O2-δ  as a promising bifunctional oxygen electrode for reversible solid oxide cells

2020 ◽  
Author(s):  
Pengzhang Li ◽  
Wei Yang ◽  
Chuanjin Tian ◽  
Wenyan Zhao ◽  
Zhe Lü ◽  
...  
Keyword(s):  
Single Cell ◽  
Peak Power ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Ionic Transfer ◽  
Oxygen Electrodes ◽  
Power Densities ◽  
Enhanced Electrochemical Performance ◽  
Transfer Channels

Abstract In this work, La2NiO4+δ-xCe0.55La0.45O2-δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30 and 40, wt %) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 oC, respectively. The enhanced electrochemical performance of LNO-30LDC oxygen electrode was mainly attributed to the extended triple phase boundary and more oxygen ionic transfer channels. The hydrogen electrode supported single cell with LNO-30LDC oxygen electrode displayed peak power densities of 276, 401 and 521 mW·cm-2 at 700, 750 and 800 oC, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm-2 under 1.5 V at 800 oC, and the corresponding hydrogen production rate was 220.03 ml·cm-2·h-1. The encouraging results indicated that LNO-30LDC was a promising bifunctional oxygen electrode material for RSOCs.

scholarly journals Electrochemical performance of La2NiO4+δ-Ce0.55La0.45O2-δ as a promising bifunctional oxygen electrode for reversible solid oxide cells

2020 ◽  
Author(s):  
Pengzhang Li ◽  
Wei Yang ◽  
Chuanjin Tian ◽  
Wenyan Zhao ◽  
Zhe Lü ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Single Cell ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Ionic Transfer ◽  
Oxygen Electrodes ◽  
Power Densities ◽  
Enhanced Electrochemical Performance ◽  
Transfer Channels

Abstract In this work, La2NiO4+δ-xCe0.55La0.45O2-δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30 and 40, wt %) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 oC, respectively. The enhanced electrochemical performance of LNO-30LDC oxygen electrode was mainly attributed to the extended triple phase boundary and more oxygen ionic transfer channels. The hydrogen electrode supported single cell with LNO-30LDC oxygen electrode displayed peak power densities of 276, 401 and 521 mW·cm-2 at 700, 750 and 800 oC, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm-2 under 1.5 V at 800 oC, and the corresponding hydrogen production rate was 220.03 ml·cm-2·h-1. The encouraging results indicated that LNO-30LDC was a promising bifunctional oxygen electrode material for RSOCs.

scholarly journals Electrochemical performance of La2NiO4+δ-Ce0.55La0.45O2−δ as a promising bifunctional oxygen electrode for reversible solid oxide cells

2021 ◽  
Author(s):  
Pengzhang Li ◽  
Wei Yang ◽  
Chuanjin Tian ◽  
Wenyan Zhao ◽  
Zhe Lü ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Single Cell ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Ionic Transfer ◽  
Oxygen Electrodes ◽  
Power Densities ◽  
Enhanced Electrochemical Performance ◽  
Transfer Channels

AbstractIn this work, La2NiO4+δ-xCe0.55La0.45O2−δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30, and 40 wt%) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 °C, respectively. The enhanced electrochemical performance of LNO-30LDC oxygen electrode was mainly attributed to the extended triple phase boundary and more oxygen ionic transfer channels. The hydrogen electrode supported single cell with LNO-30LDC oxygen electrode displayed peak power densities of 276, 401, and 521 mW·cm−2 at 700, 750, and 800 °C, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm−2 under 1.5 V at 800 °C, and the corresponding hydrogen production rate was 220.03 mL·cm−2·h−1. The encouraging results indicated that LNO-30LDC was a promising bifunctional oxygen electrode material for RSOCs.

Electrochemical Performance of Ni-YSZ, Ni/Ru-GDC, LSM-YSZ, LSCF and LSF Electrodes for Solid Oxide Electrolysis Cells

2010 ◽  
Author(s):  
P. Kim-Lohsoontorn ◽  
H.-B. Yim ◽  
J.-M. Bae
Keyword(s):  
Electrochemical Performance ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Anodic Reaction ◽  
Oxygen Electrodes ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
Electrolysis Mode

The electrochemical performance of solid oxide electrolysis cells (SOECs) having nickel – yttria stabilized zirconia (Ni-YSZ) hydrogen electrode and a composite lanthanum strontium manganite – YSZ (La0.8Sr0.2MnO3−δ – YSZ) oxygen electrodes has been studied over a range of operating conditions temperature (700 to 900°C). Increasing temperature significantly increased electrochemical performance and hydrogen generation efficiency. Durability studies of the cell in electrolysis mode were made over 200 h periods (0.1 A/cm2, 800°C, and H2O/H2 = 70/30). The cell significantly degraded over the time (2.5 mV/h). Overpotentials of various SOEC electrodes were evaluated. Ni-YSZ as a hydrogen electrode exhibited higher activity in SOFC mode than SOEC mode while Ni/Ru-GDC presented symmetrical behavior between fuel cell and electrolysis mode and gave lower losses when compared to the Ni-YSZ electrode. All the oxygen electrodes gave higher activity for the cathodic reaction than the anodic reaction. Among the oxygen electrodes in this study, LSM-YSZ exhibited nearest to symmetrical behavior between cathodic and anodic reaction. Durability studies of the electrodes in electrolysis mode were made over 20–70 h periods. Performance degradations of the oxygen electrodes were observed (3.4, 12.6 and 17.6 mV/h for LSM-YSZ, LSCF and LSF, respectively). The Ni-YSZ hydrogen electrode exhibited rather stable performance while the performance of Ni/Ru-GDC decreased (3.4 mV/h) over the time. This was likely a result of the reduction of ceria component at high operating voltage.

Enhanced Performance of Ag-Doped Oxygen Electrode Based Solid Oxide Electrolyser Cell under High Temperature Electrolysis of Steam

2014 ◽  
Vol 783-786 ◽  
pp. 1708-1713
Author(s):  
Su Hu ◽  
Qing Shan Li ◽  
Yi Feng Zheng ◽  
Shi Hao Wei ◽  
Cheng Xu
Keyword(s):  
High Temperature ◽  
Large Scale ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Solid State Method ◽  
Oxygen Electrodes ◽  
Potential Applications ◽  
Improved Performance ◽  
High Temperature Electrolysis

Solid oxide electrolyser (SOE) has been receiving increasing attention due to its potential applications in large-scale hydrogen production and carbon dioxide recycling for fuels. Improving the performance of SOE cell through oxygen electrode development has been of main interest because the major polarization loss of the SOE cell is at the oxygen electrode during high temperature electrolysis (HTE). In the present study, Ag was doped into (La0.75Sr0.25)0.95MnO3+δ(LSM) based oxygen electrode of Ni/YSZ cathode-supported SOE cell through a solid state method enhanced by ball milling. Short stacks were manufactured using doped and undoped cells and tested under HTE of steam at 800°C up to 150h for in situ comparative study of doping effect. The cells with doped oxygen electrodes showed less polarization loss, lower resistance and improved performance by comparison with the undoped cell. Post-mortem examination revealed Ag migrated from the current collecting layer to the electrolyte/anode interface, which may promote the cell performance.

scholarly journals The mechanism of the oxygen electrode

1933 ◽  
Vol 142 (847) ◽  
pp. 628-646 ◽  
Keyword(s):  
Electrode Potential ◽  
Oxygen Electrode ◽  
Critical Value ◽  
Partial Pressure Of Oxygen ◽  
Hydrogen Electrode ◽  
Thermodynamic Relation ◽  
A Value ◽  
Oxygen Electrodes ◽  
A Cell ◽  
Set Up

It is well known that the so-called "oxygen electrode" does not behave in a thermodynamically reversible manner. The decomposition voltage of water has been calculated thermodynamically from various calorimetric and solubility data by Lewis, Nernst and von Wartenberg, Brönsted and Lewis and Randall. The final critical value given by the last-named authors is 1.227 volt at 25ºC., which should therefore be the e. m. f. of a cell consisting of a reversible hydrogen electrode and a reversible oxygen electrode immersed in the same electrolyte, both gases being at 760 mm. pressure. In practice this value has never been obtained. Smale found that the e. m. f. of the hydrogen-oxygen cell, though independent of the p H of the electrolyte, was only 1.07-1.08 volt. Wilsmore obtained a value of 1.07 volt, rising to 1.12 volt if the cell were allowed to stand for stand for some days, while a similar result, 1.06 volt, was obtained by Crotogino. More recently, Richards has reported 0.979 volt, and Furman also obtains a value of about 0.98 volt. Since it is well established that the hydrogen electrode bahaves in a perfectly reversible manner in accord with thermodynamic laws, the discrepancy between the "theoretical" and experimental e. m. f. of the hydrogen-oxygen cell must have its origin in the oxygen electrode. It is in fact experimentally found that oxygen electrodes, whether set up with bright or plantinized plantium, ( a ) tend to be irreproducible, ( b ) do not obey the thermodynamic relation between electrode potential and partial pressure of oxygen, and ( c ) are readily polarized even by minute currents, thus failing to conform with any of the criteria of reversibility.

scholarly journals Chromium deposition and poisoning of La0.8Sr0.2MnO3 oxygen electrodes of solid oxide electrolysis cells

2015 ◽  
Vol 182 ◽  
pp. 457-476 ◽  
Author(s):  
Kongfa Chen ◽  
Junji Hyodo ◽  
Aaron Dodd ◽  
Na Ai ◽  
Tatsumi Ishihara ◽  
...  
Keyword(s):  
Surface Segregation ◽  
Oxygen Electrode ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Electrolysis Cell ◽  
Electrolyte Interface ◽  
Oxygen Electrodes ◽  
Inner Surface ◽  
Solid Oxide Electrolysis ◽  
Electrolyte Surface

The effect of the presence of an Fe–Cr alloy metallic interconnect on the performance and stability of La0.8Sr0.2MnO3 (LSM) oxygen electrodes is studied for the first time under solid oxide electrolysis cell (SOEC) operating conditions at 800 °C. The presence of the Fe–Cr interconnect accelerates the degradation and delamination processes of the LSM oxygen electrodes. The disintegration of LSM particles and the formation of nanoparticles at the electrode/electrolyte interface are much faster as compared to that in the absence of the interconnect. Cr deposition occurs in the bulk of the LSM oxygen electrode with a high intensity on the YSZ electrolyte surface and on the LSM electrode inner surface close to the electrode/electrolyte interface. SIMS, GI-XRD, EDS and XPS analyses clearly identify the deposition and formation of chromium oxides and strontium chromate on both the electrolyte surface and electrode inner surface. The anodic polarization promotes the surface segregation of SrO and depresses the generation of manganese species such as Mn2+. This is evidently supported by the observation of the deposition of SrCrO4, rather than (Cr,Mn)3O4 spinels as in the case under the operating conditions of solid oxide fuel cells. The present results demonstrate that the Cr deposition is essentially a chemical process, initiated by the nucleation and grain growth reaction between the gaseous Cr species and segregated SrO on LSM oxygen electrodes under SOEC operating conditions.

scholarly journals Manganese–Cobalt Based Spinel Coatings Processed by Electrophoretic Deposition Method: The Influence of Sintering on Degradation Issues of Solid Oxide Cell Oxygen Electrodes at 750 °C

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3836
Author(s):  
Elisa Zanchi ◽  
Justyna Ignaczak ◽  
Bartosz Kamecki ◽  
Piotr Jasiński ◽  
Sebastian Molin ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Oxygen Electrode ◽  
Electrochemical Characterization ◽  
Solid Oxide ◽  
Oxygen Electrodes ◽  
Current Voltage ◽  
Coating Microstructure ◽  
One Step ◽  
The One ◽  
Solid Oxide Cell

This paper seeks to examine how the Mn–Co spinel interconnect coating microstructure can influence Cr contamination in an oxygen electrode of intermediate temperature solid oxide cells, at an operating temperature of 750 °C. A Mn–Co spinel coating is processed on Crofer 22 APU substrates by electrophoretic deposition, and subsequently sintered, following both the one-step and two-step sintering, in order to obtain significantly different densification levels. The electrochemical characterization is performed on anode-supported cells with an LSCF cathode. The cells were aged prior to the electrochemical characterization in contact with the spinel-coated Crofer 22 APU at 750 °C for 250 h. Current–voltage and impedance spectra of the cells were measured after the exposure with the interconnect. Post-mortem analysis of the interconnect and the cell was carried out, in order to assess the Cr retention capability of coatings with different microstructures.

Preparation of SDC Interlayer and Influence on Performances of Anode Supported Solid Oxide Fuel Cells

2007 ◽  
Vol 336-338 ◽  
pp. 486-489
Author(s):  
Wei Tao Bao ◽  
Jian Feng Gao ◽  
Guang Yao Meng
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Single Cell ◽  
Peak Power ◽  
Powder Coating ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Coating Method ◽  
Ysz Electrolyte ◽  
Anode Support

A single cell with a two-layer electrolyte consisting of an yttria stabilized zirconia (YSZ, Y2O3 8 mol%) layer and an Sm-doped ceria (SDC, Sm2O3 20mol%) interlayer has been fabricated on porous YSZ-NiO anode support. The layer of YSZ electrolyte was prepared by modified electrostatic powder coating method and the SDC interlayer by screen-printed method on the green YSZ layer. After co-firing at 1400°C for 5 h, the two-layer film with a dense YSZ film of about 15μm and porous SDC film of about 25μm was fabricated. The performances of as-fabricated single cell using La0.8Sr0.2FeO3 as cathode were tested using H2-3% H2O as fuel and air as oxidant at 800°C. Results indicated that the peak power density of a single cell with SDC interlayer reaches 469 mW/cm2 at 800°C, obviously higher than that of without SDC interlayer, which is about 300 mW/cm2 at 800°C.

Cobalt-substituted SrTi0.3Fe0.7O3−δ: a stable high-performance oxygen electrode material for intermediate-temperature solid oxide electrochemical cells

2018 ◽  
Vol 11 (7) ◽  
pp. 1870-1879 ◽  
Author(s):  
Shan-Lin Zhang ◽  
Hongqian Wang ◽  
Matthew Y. Lu ◽  
Ai-Ping Zhang ◽  
Liliana V. Mogni ◽  
...  
Keyword(s):  
Electrode Material ◽  
Polarization Resistance ◽  
High Performance ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Electrochemical Cells ◽  
Unique Combination ◽  
Oxygen Electrodes

SrTi0.3Fe0.7−xCoxO3−δ oxygen electrodes provide a unique combination of low polarization resistance and stability useful for solid oxide electrochemical cells.

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