Electrochemistry of La0.3Sr0.7Fe0.7Cr0.3O3−δ as an oxygen and fuel electrode for RSOFCs

2015 ◽  
Vol 182 ◽  
pp. 159-175 ◽  
Author(s):  
Beatriz Molero-Sánchez ◽  
Paul Addo ◽  
Aligul Buyukaksoy ◽  
Scott Paulson ◽  
Viola Birss
Keyword(s):  
Cyclic Voltammetry ◽  
Co Oxidation ◽  
Detailed Analysis ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Open Circuit ◽  
Solid Oxide ◽  
Cell Design ◽  
Half Cell ◽  
Manufacturing Costs

The use of a single porous mixed ion-electron conducting (MIEC) material as both the oxygen and fuel electrodes in reversible solid oxide cells is of increasing interest, primarily due to the resulting simplified cell design and lower manufacturing costs. In this work, La0.3Sr0.7Fe0.7Cr0.3O3−δ (LSFCr-3) was studied in a 3-electrode half-cell configuration in air, pure CO2 and in a 1 : 1 CO2 : CO mixture, over a temperature range of 650–800 °C. A detailed analysis of the impedance (EIS) data, under both open circuit and polarized conditions, as well as the cyclic voltammetry response of LSFCr-3 has shown that it is very active in all of these environments, but with oxygen evolution being somewhat more facile that oxygen reduction, and CO2 reduction more active than CO oxidation. Evidence for a chemical capacitance, associated with the Fe3+/4+ redox process in LSFCr-3, was also obtained from the EIS and CV data in all gas environments.

scholarly journals Identification of catalytic sites for oxygen reduction and oxygen evolution in N-doped graphene materials: Development of highly efficient metal-free bifunctional electrocatalyst

2016 ◽  
Vol 2 (4) ◽  
pp. e1501122 ◽  
Author(s):  
Hong Bin Yang ◽  
Jianwei Miao ◽  
Sung-Fu Hung ◽  
Jiazang Chen ◽  
Hua Bing Tao ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Active Sites ◽  
Carbon Nanomaterials ◽  
Specific Capacity ◽  
Open Circuit ◽  
Practical Significance ◽  
Metal Free ◽  
Highly Efficient

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical to renewable energy conversion and storage technologies. Heteroatom-doped carbon nanomaterials have been reported to be efficient metal-free electrocatalysts for ORR in fuel cells for energy conversion, as well as ORR and OER in metal-air batteries for energy storage. We reported that metal-free three-dimensional (3D) graphene nanoribbon networks (N-GRW) doped with nitrogen exhibited superb bifunctional electrocatalytic activities for both ORR and OER, with an excellent stability in alkaline electrolytes (for example, KOH). For the first time, it was experimentally demonstrated that the electron-donating quaternary N sites were responsible for ORR, whereas the electron-withdrawing pyridinic N moieties in N-GRW served as active sites for OER. The unique 3D nanoarchitecture provided a high density of the ORR and OER active sites and facilitated the electrolyte and electron transports. As a result, the as-prepared N-GRW holds great potential as a low-cost, highly efficient air cathode in rechargeable metal-air batteries. Rechargeable zinc-air batteries with the N-GRW air electrode in a two-electrode configuration exhibited an open-circuit voltage of 1.46 V, a specific capacity of 873 mAh g−1, and a peak power density of 65 mW cm−2, which could be continuously charged and discharged with an excellent cycling stability. Our work should open up new avenues for the development of various carbon-based metal-free bifunctional electrocatalysts of practical significance.

Rational prediction of multifunctional bilayer single atom catalysts for the hydrogen evolution, oxygen evolution and oxygen reduction reactions

Nanoscale ◽  
2020 ◽  
Vol 12 (39) ◽  
pp. 20413-20424
Author(s):  
Riming Hu ◽  
Yongcheng Li ◽  
Fuhe Wang ◽  
Jiaxiang Shang
Keyword(s):  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Oxygen Evolution ◽  
Single Atom ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions

Bilayer single atom catalysts can serve as promising multifunctional electrocatalysts for the HER, ORR, and OER.

Strain Effects on Oxygen Reduction Activity of Pr2NiO4 Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

2019 ◽  
Vol 2 (2) ◽  
pp. 1210-1220 ◽  
Author(s):  
Sun Jae Kim ◽  
Taner Akbay ◽  
Junko Matsuda ◽  
Atsushi Takagaki ◽  
Tatsumi Ishihara
Keyword(s):  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Strain Effects ◽  
Reduction Activity
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