Electrochemical reactivation of expanded graphite electrodes covered by oligomeric products of phenol electrooxidation

2012 ◽  
Vol 79 ◽  
pp. 202-209 ◽  
Author(s):  
P. Krawczyk ◽  
J.M. Skowroński
Keyword(s):  
Expanded Graphite ◽  
Graphite Electrodes ◽  
Phenol Electrooxidation

scholarly journals Modification of Expanded Graphite Electrodes by Ozone Treatment

2010 ◽  
Vol 118 (3) ◽  
pp. 465-470 ◽  
Author(s):  
P. Krawczyk ◽  
J.M. Skowroński
Keyword(s):  
Expanded Graphite ◽  
Ozone Treatment ◽  
Graphite Electrodes

scholarly journals Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors

2017 ◽  
Vol 28 (23) ◽  
pp. 18022-18030 ◽  
Author(s):  
Jiawei Yuan ◽  
Shuihua Tang ◽  
Zhentao Zhu ◽  
Xiaolong Qin ◽  
Renjie Qu ◽  
...  
Keyword(s):  
High Performance ◽  
Expanded Graphite ◽  
Facile Synthesis ◽  
Asymmetric Supercapacitors ◽  
Graphite Electrodes

scholarly journals Regeneration of expanded graphite electrodes by joined electrochemical and ozone treatment in liquid phase

2018 ◽  
Vol 22 (12) ◽  
pp. 3965-3975
Author(s):  
A. Bachar ◽  
B. Gurzęda ◽  
J. Zembrzuska ◽  
M. Nocuń ◽  
P. Krawczyk
Keyword(s):  
Liquid Phase ◽  
Expanded Graphite ◽  
Ozone Treatment ◽  
Graphite Electrodes

Palygorskite–expanded graphite electrodes for catalytic electro-oxidation of phenol

2010 ◽  
Vol 49 (1-2) ◽  
pp. 64-68 ◽  
Author(s):  
Yong Kong ◽  
Xiaohui Chen ◽  
Junhua Ni ◽  
Shiping Yao ◽  
Wenchang Wang ◽  
...  
Keyword(s):  
Expanded Graphite ◽  
Graphite Electrodes ◽  
Electro Oxidation ◽  
Oxidation Of Phenol

scholarly journals SELECTION OF MODE OF ANODIC TREATMENT OF GRAPHITE IN A SPENT NITRIC ACID ETCHING SOLUTION FOR PRODUCING THERMALLY EXPANDING GRAPHITE COMPOUNDS

2019 ◽  
Vol 62 (6) ◽  
pp. 77-83
Author(s):  
Ivan N. Frolov ◽  
Sergey L. Zabudkov ◽  
Andrey V. Yakovlev ◽  
Marina I. Lopukhova
Keyword(s):  
Nitric Acid ◽  
Oxygen Evolution ◽  
Nitrate Solution ◽  
Expanded Graphite ◽  
Metal Cations ◽  
Graphite Electrodes ◽  
Anodic Treatment ◽  
Graphite Matrix ◽  
Potentiodynamic Curves ◽  
Copper Cations

The possibility of using galvanic waste for the synthesis of graphite thermo expanded compounds has been shown. An electrolyte on the basis of a spent nitrate solution of etching copper parts containing cations of various metals in its composition was taken as an example, thereby solving an environmental issue related to the problem of utilization of solutions containing nitric or sulfuric anions in its composition. The processes occurring in the synthesis of thermally expanding graphite compounds on platinum and graphite electrodes in the electrolyte under investigation were studied by the method of potentiodynamic curves. The currents on the potentiodynamic curves before reaching the oxygen evolution potential were due to the oxidation of the surface-functional groups followed by intercalation of the graphite matrix. It was revealed that the potential for oxygen evolution in the electrolyte based on the spent nitric acid solution of etching of copper parts is slightly lower than in 58% HNO3 due to the presence of metal cations in the composition. Free metal cations attract a part of water molecules to form hydrate shells, while copper cations form complexes where H2O molecules are ligands, which makes it difficult to release oxygen. In the electrochemical synthesis of thermally expanding graphite compounds, potentiostatic and galvanostatic modes were applied. A range of potentials of 1.8 - 2.2 V was chosen for performing the synthesis in the potentiostatic mode. Recommendations are given for the application of the galvanostatic mode with the current of anodic treatment of 60 - 140 mA (per 1 g of graphite) for the synthesis of graphite thermo expanding compounds in industrial volumes. The thermo expanded graphite obtained in this manner is characterized by a bulk density of less than 2 g/dm3.

Electricity Production from Dual Chambers Microbial Fuel Cell Fed with Chicken Manure-Wastewater

2015 ◽  
Vol 3 (1) ◽  
pp. 9-18
Author(s):  
Ali J. Jaeel
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Chicken Manure ◽  
Electricity Production ◽  
Anaerobic Sludge ◽  
Livestock Wastewater ◽  
Graphite Electrodes ◽  
Reliable Source ◽  
Current Densities ◽  
Resistance Value

Chicken manure wastewaters are increasingly being considered a valuable resource of organic compounds. Screened chicken manure was evaluated as a representative solid organic waste. In this study, electricity generation from livestock wastewater (chicken manure) was investigated in a continuous mediator-less horizontal flow microbial fuel cell with graphite electrodes and a selective type of membrane separating the anodic and cathodic compartments of MFC from each other. The performance of MFC was evaluated to livestock wastewater using aged anaerobic sludge. Results revealed that COD and BOD removal efficiencies were up to 88% and 82%, respectively. At an external resistance value of 150 Ω, a maximum power and current densities of 278 m.W/m2 and 683 mA/m2, respectively were obtained, hence MFC utilizing livestock wastewater would be a sustainable and reliable source of bio-energy generation .

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