scholarly journals A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

2021 ◽  
Author(s):  
Jing Chen ◽  
Zhenxiang Zhao ◽  
Yu Feng ◽  
Xuzhuo Sun ◽  
Bo Li ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrocatalytic Activity ◽  
Nitrogen Atmosphere ◽  
Perovskite Oxide ◽  
Oxide Precursor ◽  
New Strategy

This study demonstrates a new strategy to further improve the oxygen non-stoichiometry (δ) and electrocatalytic activity of cathode by pre-calcining the perovskite oxide precursor in nitrogen atmosphere.

Synthesis, structure and electrochemical performance of double perovskite oxide Sr2Fe1-xTixNbO6-δ as SOFC electrode

2017 ◽  
Vol 724 ◽  
pp. 666-673 ◽  
Author(s):  
Afizul Hakem Karim ◽  
Ka-Young Park ◽  
Tae Hee Lee ◽  
S.A. Muhammed Ali ◽  
Shahzad Hossain ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Double Perovskite ◽  
Perovskite Oxide

Probing the unexpected behavior of AuNPs migrating through nanofibers: a new strategy for the fabrication of carbon nanofiber–noble metal nanocrystal hybrid nanostructures

2014 ◽  
Vol 2 (30) ◽  
pp. 11728-11741 ◽  
Author(s):  
Han Zhu ◽  
MingLiang Du ◽  
Ming Zhang ◽  
MeiLing Zou ◽  
TingTing Yang ◽  
...  
Keyword(s):  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Electrochemical Sensors ◽  
Carbon Nanofiber ◽  
High Sensitivity ◽  
Intimate Relationship ◽  
Hybrid Nanostructures ◽  
Intensive Research ◽  
New Strategy ◽  
Relationship Of

The intimate relationship of electrochemical sensors with high sensitivity and reliability has stimulated intensive research on developing versatile materials with excellent electrocatalytic activity.

Enhanced electrocatalytic activity of three-dimensionally-ordered macroporous La0.6Sr0.4CoO3−δ perovskite oxide for Li–O2 battery application

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 32212-32219 ◽  
Author(s):  
Mi Young Oh ◽  
Jong Ju Lee ◽  
Awan Zahoor ◽  
G. Gnana kumar ◽  
Kee Suk Nahm
Keyword(s):  
Electrocatalytic Activity ◽  
Catalytic Performance ◽  
Perovskite Oxide ◽  
Ordered Macroporous ◽  
Battery Application

The 3DOM LSC exhibited a better catalytic performance than Powder LSC and improved the reversibility of the O2 electrode.

Electrocatalytic Activity of Lanthanum Chromite-Based Composite Cathode for Ammonia Synthesis from Water and Nitrogen

2021 ◽  
Vol 1160 ◽  
pp. 65-74
Author(s):  
Ibrahim A. Amar ◽  
Mohammed M. Ahwidi
Keyword(s):  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Ammonia Synthesis ◽  
Formation Rate ◽  
Sol Gel ◽  
Composite Cathode ◽  
Perovskite Oxide ◽  
Synthesis Process ◽  
Lanthanum Chromite ◽  
Faradaic Efficiency

The electrocatalytic ammonia synthesis using water (along with nitrogen) as a hydrogen source is proposed as an alternative green and clean technology to the energy-intensive and CO2-emitting process (Haber-Bosch) for ammonia production. Besides, a selective electrocatalyst for ammonia synthesis versus the competing hydrogen evolution remains elusive. This study aims to investigate the electrocatalytic activity of non-noble metal Co and Fe-free perovskite oxide-based composite cathode (La0.75Sr0.25Cr0.5Mn0.5O3-δ-Ce0.8Gd0.18Ca0.02O2-δ) towards ammonia synthesis from H2O and N2. The electrocatalyst was synthesized via a sol-gel process and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ammonia was successfully with a maximum formation rate of 2.5 × 10-10 mol s-1 cm-2 and Faradaic efficiency of 0.52% at 400 oC and applied voltage of 1.4 V. The results demonstrated that the proposed non-noble metal-based electrocatalyst is a promising material for the carbon-free ammonia synthesis process.

The oriented growth of tungsten oxide in ordered mesoporous carbon and their electrochemical performance

Nanoscale ◽  
2014 ◽  
Vol 6 (10) ◽  
pp. 5359-5371 ◽  
Author(s):  
Tao Wang ◽  
Jing Tang ◽  
Xiaoli Fan ◽  
Jianhua Zhou ◽  
Hairong Xue ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Tungsten Oxide ◽  
Electrocatalytic Activity ◽  
Mesoporous Carbon ◽  
Ordered Mesoporous Carbon ◽  
Oriented Growth ◽  
Catalytic Graphitization ◽  
Ordered Mesoporous

The WO3nanorod in ordered mesoporous carbon reveals a catalytic graphitization effect and unusual electrocatalytic activity.

Bimetallic nanoparticle decorated perovskite oxide for state-of-the-art trifunctional electrocatalysis

2019 ◽  
Vol 7 (33) ◽  
pp. 19453-19464 ◽  
Author(s):  
Quazi Arif Islam ◽  
Rahul Majee ◽  
Sayan Bhattacharyya
Keyword(s):  
Oxygen Reduction ◽  
Water Oxidation ◽  
Electrocatalytic Activity ◽  
Bimetallic Nanoparticles ◽  
State Of The Art ◽  
Perovskite Oxide ◽  
Reduction Reactions ◽  
Bimetallic Nanoparticle

B-site cation exsolution in perovskite oxide (ABO3) catalyst to surface decorated bimetallic nanoparticles facilitates the usually arduous trifunctional electrocatalytic activity towards oxygen reduction and water oxidation cum reduction reactions.

scholarly journals Construction of KB@ZIF-8/PP Composite Separator for Lithium–Sulfur Batteries with Enhanced Electrochemical Performance

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4210
Author(s):  
Bingyi Ma ◽  
Xin Zhang ◽  
Xiaoqian Deng ◽  
Sheng Huang ◽  
Min Xiao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Retention Rate ◽  
High Capacity ◽  
Base Interaction ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
New Strategy ◽  
Composite Separator ◽  
Enhanced Electrochemical Performance ◽  
Lithium Sulfur

Lithium–sulfur batteries (LSBs) have attracted wide attention, but the shuttle effect of polysulfide hinders their further practical application. Herein, we develop a new strategy to construct a Ketjen black@zeolite imidazole framework-8/polypropylene composite separator. Such a separator consists of Ketjen black (KB), zeolite imidazole framework-8 (ZIF-8) and polypropylene (PP) with a low coating load of 0.06 mg cm−2 and is denoted as KB@ZIF-8/PP. KB@ZIF-8/PP can absorb polysulfides because of the Lewis acid-base interaction between ZIF-8 and polysulfides. This interaction can reduce the dissolution of polysulfides and suppress the shuttle effect, thereby enhancing the electrochemical performance of the battery. When tested at a current density of 0.1 C, an LSB with a KB@ZIF-8/PP separator exhibits low polarization and achieves a high initial capacity of 1235.6 mAh/g and a high capacity retention rate of 59.27% after 100 cycles.

scholarly journals Activated carbon from agave wastes (agave tequilana) for supercapacitors via potentiostatic floating test

2021 ◽  
Author(s):  
Isi Keyla Rangel-Heredia ◽  
Luis Carlos Torres-González ◽  
Eduardo Maximiano Sánchez-Cervantes ◽  
Lorena Leticia Garza-Tovar
Keyword(s):  
Activated Carbon ◽  
Electrochemical Performance ◽  
Nitrogen Atmosphere ◽  
Accelerated Ageing ◽  
Type I ◽  
Galvanostatic Charge ◽  
Coin Cell ◽  
Thermal Pyrolysis ◽  
Graphitization Degree ◽  
Pyrolysis Processes

Abstract To prepare an efficient supercapacitor, an activated carbon from agave wastes was prepared and their electrochemical performance was evaluated as a novel electrode for supercapacitor. The carbon was prepared by two thermal pyrolysis processes under nitrogen atmosphere. The first pyrolysis was achieved at 500°C until the charring of the bagasse, in the second pyrolysis step, the char was impregnated with different mass ratios of KOH (1:2 − 1:4) and thermally treated at 800 or 900°C, for 1 h under N2 flow. The textural analysis showed that the activated carbon had a specific surface area of 1462 m2 g− 1 and depicted a type I isotherm (IUPAC) characteristic of a microporous carbon. Raman spectroscopy and XRD measurements confirm that the activated carbon contains a small graphitization degree and a disordered structure. The electrochemical study of the symmetric carbon supercapacitor was carried out in 1M Li2SO4 solution as the electrolyte. The electrochemical performance of the coin cell supercapacitor was evaluated under an accelerated ageing floating test consisting of potentiostatic steps at different voltages (1.5, 1.6 and 1.8 V) for 10 h followed by galvanostatic charge/discharge sequences, the overall procedure summarized a floating time up to 200 h. The highest capacitance was observed at a floating voltage of 1.5 V, with a large initial specific capacitance of 297 F g− 1.

Antimony-doped Bi0.5Sr0.5FeO3−δ as a novel Fe-based oxygen reduction electrocatalyst for solid oxide fuel cells below 600 °C

2018 ◽  
Vol 6 (31) ◽  
pp. 15221-15229 ◽  
Author(s):  
Lei Gao ◽  
Qiang Li ◽  
Liping Sun ◽  
Tian Xia ◽  
Lihua Huo ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Perovskite Oxide ◽  
Structure Stability ◽  
Oxide Fuel

The perovskite oxide Bi0.5Sr0.5Fe0.90Sb0.10O3−δ exhibits good structure stability and superior electrocatalytic activity for the oxygen reduction reaction, making it a highly promising cathode for LT-SOFCs.

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