An insight into the electrochemical performance of La0.5−xPrxBa0.5CoO3−δ as cathodes for solid oxide fuel cells: study of the O2-reduction reaction

2018 ◽  
Vol 6 (34) ◽  
pp. 16699-16709 ◽  
Author(s):  
D. Garcés ◽  
H. Wang ◽  
S. A. Barnett ◽  
A. G. Leyva ◽  
F. R. Napolitano ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Polarization Resistance ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Electrode Polarization ◽  
Oxide Fuel ◽  
Resistance Response ◽  
O2 Reduction ◽  
Insight Into

The mechanism controlling the electrode polarization resistance response was studied for new LT-SOFC cathodes with La0.5−xPrxBa0.5CoO3−δ (0 ≤ x ≤ 0.5) compositions.

Tailoring defect chemistry at interfaces for promoted oxygen reduction reaction kinetics

2020 ◽  
Vol 8 (44) ◽  
pp. 23313-23322
Author(s):  
Seo Ju Kim ◽  
Ja Yang Koo ◽  
Taeeun Mun ◽  
Mingi Choi ◽  
Wonyoung Lee
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Reaction Kinetics ◽  
Oxygen Reduction ◽  
Defect Chemistry ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel

Engineering the defect chemistry at the interface between the electrolyte and the electrode is crucial to facilitate oxygen reduction reaction, thereby improve the electrochemical performance of intermediate temperature solid oxide fuel cells.

scholarly journals Fabrication and Electrochemical Performance of Zn-Doped La0.2Sr0.25Ca0.45TiO3 Infiltrated with Nickel-CGO, Iron, and Cobalt as an Alternative Anode Material for Solid Oxide Fuel Cells

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 269 ◽  
Author(s):  
Nazan Muzaffar ◽  
Nasima Arshad ◽  
Daniel Drasbæk ◽  
Bhaskar Sudireddy ◽  
Peter Holtappels
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sulphur Poisoning ◽  
Operating Temperatures

In solid oxide fuel cells, doped strontium titinates have been widely studied as anode materials due to their high n-type conductivity. They are used as current conducting backbones as an alternative to nickel-cermets, which suffer degradation due to coking, sulphur poisoning, and low tolerance to redox cycling. In this work, anode backbone materials were synthesized from La0.2Sr0.25Ca0.45TiO3−δ (LSCTA-), modified with 5 wt.% Zn, and infiltrated with nickel (Ni)/ceria gadolinium-doped cerium oxide (CGO), Fe, and Co. The electrodes were further studied for their electrochemical performance using electrochemical impedance spectroscopy (EIS) at open circuit voltage (OCV) in different hydrogen to steam ratios and at various operating temperatures (850–650 °C). Infiltration of electrocatalysts significantly reduced the polarization resistance and among the studied infiltrates, at all operating temperatures, Ni-CGO showed excellent electrode performance. The polarization resistances in 3% and 50% H2O/H2 atmosphere were found to be 0.072 and 0.025 Ω cm2, respectively, at 850 °C, and 0.091 and 0.076 Ω cm2, respectively, at 750 °C, with Ni-CGO. These values are approximately three orders of magnitude smaller than the polarization resistance (25 Ω cm2) of back bone material measured at 750 °C.

A perovskite-type Nd0.75Sr0.25Co0.8Fe0.2O3−δ cathode for advanced solid oxide fuel cells

2019 ◽  
Vol 55 (26) ◽  
pp. 3713-3716 ◽  
Author(s):  
Suresh Mulmi ◽  
Venkataraman Thangadurai
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Chemical Stability ◽  
Polarization Resistance ◽  
Composite Cathode ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Perovskite Type

Perovskite-type Nd0.75Sr0.25Co0.8Fe0.2O3−δ (NSCF) has shown excellent oxygen reduction reaction properties (an area specific polarization resistance of 0.1 Ω cm2 at 700 °C) as a composite cathode (30 wt% La0.8Sr0.2Ga0.8Mg0.2O3−δ (LSGM)) with remarkable chemical stability under CO2.

New mechanistic insight into the oxygen reduction reaction on Ruddlesden–Popper cathodes for intermediate-temperature solid oxide fuel cells

2016 ◽  
Vol 18 (12) ◽  
pp. 8502-8511 ◽  
Author(s):  
Wenyuan Li ◽  
Bo Guan ◽  
Xinxin Zhang ◽  
Jianhua Yan ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Mechanistic Insight ◽  
Insight Into

Ruddlesden–Popper (R–P) phase materials have been investigated widely as cathode candidates for IT-SOFCs.

Trade-off between oxygen reduction reaction activity and CO2 stability in a cation doped Ba0.9Co0.7Fe0.3O3−δ perovskite cathode for solid oxide fuel cells

2020 ◽  
Vol 4 (10) ◽  
pp. 5229-5237
Author(s):  
Yi Lu ◽  
Xinyu Zhao ◽  
Zhihong Wang ◽  
Xifeng Ding
Keyword(s):  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Oxygen Reduction Reaction Activity ◽  
Trade Off ◽  
New Type

Highly electrochemical performance and CO2 durability are two challenges for exploring cathodes in SOFCs. A new type of Ba0.9Co0.7Fe0.2M0.1O3−δ (M = Zr, Nb, Y) perovskites as promising cathode for IT-SOFCs has been developed with cations doping.

scholarly journals A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yixiao Cai ◽  
Yang Chen ◽  
Muhammad Akbar ◽  
Bin Jin ◽  
Zhengwen Tu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Short Circuit ◽  
Solid Oxide ◽  
Superior Performance ◽  
Electrode Polarization ◽  
Oxide Fuel ◽  
Ac Impedance Analysis

AbstractSince colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs.

Insight into the Structure and Functional Application of the Sr0.95Ce0.05CoO3−δ Cathode for Solid Oxide Fuel Cells

2015 ◽  
Vol 54 (7) ◽  
pp. 3477-3484 ◽  
Author(s):  
Wei Yang ◽  
Huairuo Zhang ◽  
Chunwen Sun ◽  
Lilu Liu ◽  
J. A. Alonso ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Insight Into
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