scholarly journals Silver Decorated Reduced Graphene Oxide as Electrocatalyst for Zinc–Air Batteries

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 462 ◽  
Author(s):  
Laksanaporn Poolnapol ◽  
Wathanyu Kao-ian ◽  
Anongnat Somwangthanaroj ◽  
Falko Mahlendorf ◽  
Mai Thanh Nguyen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
Rotating Disk Electrode ◽  
High Energy Density ◽  
Air Cathode ◽  
Discharge Performance ◽  
Reduced Graphene ◽  
Air Battery ◽  
Zinc Air Batteries

Due to their low cost and very high energy density, zinc–air batteries (ZABs) exhibit high potential for various energy applications. The electrochemical performance of the air-cathode has a decisive impact on the discharge performance of ZABs because the sluggish oxygen reduction reaction (ORR) kinetics increase the overpotential of the air-cathode and hence the performance of ZABs. In this work, reduced graphene oxide decorated with silver nanoparticles (AgNP/rGO) is synthesized using simultaneous reduction of graphene oxide and silver ions. Different amounts of silver loading are examined for the synthesis of AgNP/rGO. The synthesized AgNP/rGO samples are analyzed using a rotating disk electrode in order to investigate ORR activity. Then, the synthesized AgNP/rGO electrocatalyst is applied on a tubular designed zinc–air battery in order to study the performance of the zinc–air battery. Results demonstrate that AgNP/rGO is an efficient and cost-effective ORR electrocatalyst for its practical application in ZABs.

Construction of (Ni, Cu) Se2 //Reduced Graphene Oxide for High Energy Density Asymmetric Supercapacitor

2017 ◽  
Vol 4 (11) ◽  
pp. 3004-3010 ◽  
Author(s):  
Bo Chen ◽  
Yifan Tian ◽  
Zhaoxi Yang ◽  
Yunjun Ruan ◽  
Jianjun Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Reduced Graphene

A rechargeable zinc-air battery based on zinc peroxide chemistry

Science ◽  
2020 ◽  
Vol 371 (6524) ◽  
pp. 46-51
Author(s):  
Wei Sun ◽  
Fei Wang ◽  
Bao Zhang ◽  
Mengyi Zhang ◽  
Verena Küpers ◽  
...  
Keyword(s):  
Atmospheric Carbon Dioxide ◽  
Ambient Air ◽  
High Energy ◽  
Zinc Ion ◽  
High Energy Density ◽  
Air Cathode ◽  
Reversible Redox ◽  
Air Battery ◽  
Zinc Peroxide ◽  
Zinc Air Batteries

Rechargeable alkaline zinc-air batteries promise high energy density and safety but suffer from the sluggish 4 electron (e−)/oxygen (O2) chemistry that requires participation of water and from the electrochemical irreversibility originating from parasitic reactions caused by caustic electrolytes and atmospheric carbon dioxide. Here, we report a zinc-O2/zinc peroxide (ZnO2) chemistry that proceeds through a 2e−/O2 process in nonalkaline aqueous electrolytes, which enables highly reversible redox reactions in zinc-air batteries. This ZnO2 chemistry was made possible by a water-poor and zinc ion (Zn2+)–rich inner Helmholtz layer on the air cathode caused by the hydrophobic trifluoromethanesulfonate anions. The nonalkaline zinc-air battery thus constructed not only tolerates stable operations in ambient air but also exhibits substantially better reversibility than its alkaline counterpart.

Sandwich-like NiCo layered double hydroxide/reduced graphene oxide nanocomposite cathodes for high energy density asymmetric supercapacitors

2019 ◽  
Vol 48 (16) ◽  
pp. 5193-5202 ◽  
Author(s):  
Kai Le ◽  
Zhou Wang ◽  
Fenglong Wang ◽  
Qi Wang ◽  
Qian Shao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene ◽  
Excellent Cycling Stability ◽  
Double Hydroxide

Lab-synthesized sandwich-like LDH/rGO composites were assembled into asymmetric supercapacitors exhibiting high energy density and excellent cycling stability.

3D cuboidal vanadium diselenide embedded reduced graphene oxide hybrid structures with enhanced supercapacitor properties

2017 ◽  
Vol 53 (1) ◽  
pp. 228-231 ◽  
Author(s):  
Subba R. Marri ◽  
Satyajit Ratha ◽  
Chandra Sekhar Rout ◽  
J. N. Behera
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Synthesis ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Energy Density ◽  
Hybrid Structures ◽  
Ultra High Energy ◽  
Coin Cell ◽  
Reduced Graphene ◽  
Supercapacitor Performance

Hydrothermal synthesis of VSe2/reduced graphene oxide (RGO) has been reported and its supercapacitor performance was evaluated in a typical CR2032 coin cell setup. A specific capacitance of 680 F g−1and an ultra-high energy density of 212 W h kg−1were achieved.

High‐Energy Density Li‐Ion Capacitor with Layered SnS 2 /Reduced Graphene Oxide Anode and BCN Nanosheet Cathode

2019 ◽  
Vol 10 (6) ◽  
pp. 1902836 ◽  
Author(s):  
Yizhan Hao ◽  
Shouzhi Wang ◽  
Yongliang Shao ◽  
Yongzhong Wu ◽  
Shiding Miao
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Energy Density ◽  
Reduced Graphene ◽  
Li Ion ◽  
Oxide Anode

High energy density asymmetric supercapacitors with a nickel oxide nanoflake cathode and a 3D reduced graphene oxide anode

Nanoscale ◽  
2013 ◽  
Vol 5 (17) ◽  
pp. 7984 ◽  
Author(s):  
Feng Luan ◽  
Gongming Wang ◽  
Yichuan Ling ◽  
Xihong Lu ◽  
Hanyu Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Nickel Oxide ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene ◽  
Oxide Anode
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