A study of corrosion stability of 50PtCoCr/C cathode catalyst

The corrosion stability (under the chemical effect of acid environment and cycling of electrode potential) of 50 wt % PtCoCr/C trimetallic cathode catalyst has been studied. It is proposed that the dominant mode of degradation is dissolution of platinum nanoparticles and their redeposition on a surf...

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Veröffentlicht in:Protection of metals and physical chemistry of surfaces 2015-12, Vol.51 (7), p.1185-1193
Hauptverfasser: Bogdanovskaya, V. A., Zhutaeva, G. V., Radina, M. V., Tarasevich, M. R.
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container_issue 7
container_start_page 1185
container_title Protection of metals and physical chemistry of surfaces
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creator Bogdanovskaya, V. A.
Zhutaeva, G. V.
Radina, M. V.
Tarasevich, M. R.
description The corrosion stability (under the chemical effect of acid environment and cycling of electrode potential) of 50 wt % PtCoCr/C trimetallic cathode catalyst has been studied. It is proposed that the dominant mode of degradation is dissolution of platinum nanoparticles and their redeposition on a surface. The values of activation energy of electrolytic reduction of molecular oxygen on 50 wt % PtCoCr/C catalysts, as well as the activation energy of its corrosion in 0.5 M H 2 SO 4 solution, have been determined. The high corrosion stability of PtCoCr/C catalyst is attributed to the lower extent of filling of platinum surface with oxygen-containing particles ( Q O /2 Q H ), which constitute the initial stage of platinum dissolution. It has been shown that the decrease in mass activity in electrolytic reduction of O 2 during cycling of potential at 20°C up to 4000 cycles is 15%, which is significantly higher than for the monoplatinum system. The above-proposed mechanism of catalyst degradation in model experiments can lead to permanent loss of Pt ions in electrolyte bulk. In the case of measurements in a fuel cell (FC), a degradation mechanism described as dissolution of platinum nanoparticles and their redeposition on surface can be accompanied (as a consequence of a low amount of electrolyte in the FC) with redeposition of platinum particles in polymeric electrolyte.
doi_str_mv 10.1134/S2070205115070035
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The high corrosion stability of PtCoCr/C catalyst is attributed to the lower extent of filling of platinum surface with oxygen-containing particles ( Q O /2 Q H ), which constitute the initial stage of platinum dissolution. It has been shown that the decrease in mass activity in electrolytic reduction of O 2 during cycling of potential at 20°C up to 4000 cycles is 15%, which is significantly higher than for the monoplatinum system. The above-proposed mechanism of catalyst degradation in model experiments can lead to permanent loss of Pt ions in electrolyte bulk. 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R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A study of corrosion stability of 50PtCoCr/C cathode catalyst</atitle><jtitle>Protection of metals and physical chemistry of surfaces</jtitle><stitle>Prot Met Phys Chem Surf</stitle><date>2015-12-01</date><risdate>2015</risdate><volume>51</volume><issue>7</issue><spage>1185</spage><epage>1193</epage><pages>1185-1193</pages><issn>2070-2051</issn><eissn>2070-206X</eissn><abstract>The corrosion stability (under the chemical effect of acid environment and cycling of electrode potential) of 50 wt % PtCoCr/C trimetallic cathode catalyst has been studied. It is proposed that the dominant mode of degradation is dissolution of platinum nanoparticles and their redeposition on a surface. The values of activation energy of electrolytic reduction of molecular oxygen on 50 wt % PtCoCr/C catalysts, as well as the activation energy of its corrosion in 0.5 M H 2 SO 4 solution, have been determined. The high corrosion stability of PtCoCr/C catalyst is attributed to the lower extent of filling of platinum surface with oxygen-containing particles ( Q O /2 Q H ), which constitute the initial stage of platinum dissolution. It has been shown that the decrease in mass activity in electrolytic reduction of O 2 during cycling of potential at 20°C up to 4000 cycles is 15%, which is significantly higher than for the monoplatinum system. The above-proposed mechanism of catalyst degradation in model experiments can lead to permanent loss of Pt ions in electrolyte bulk. In the case of measurements in a fuel cell (FC), a degradation mechanism described as dissolution of platinum nanoparticles and their redeposition on surface can be accompanied (as a consequence of a low amount of electrolyte in the FC) with redeposition of platinum particles in polymeric electrolyte.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S2070205115070035</doi><tpages>9</tpages></addata></record>
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subjects Activation energy
Alloys
Catalysts
Cathodes
Cathodic dissolution
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion
Corrosion and Coatings
Corrosion effects
Corrosion in the Processes of Hydrogen Energetics
Corrosion potential
Corrosion tests
Cycles
Degradation
Dissolution
Electrodes
Electrolytes
Fuel cells
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Mathematical models
Metallic Materials
Nanoparticles
Oxygen
Physical chemistry
Platinum
Reduction (electrolytic)
Stability
Surface stability
Systems stability
Tribology
title A study of corrosion stability of 50PtCoCr/C cathode catalyst
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