Effect of methanol concentration on oxygen reduction reaction activity of Pt/C catalysts


Autoria(s): Tang , S-H; Lin, Wenfeng; Christensen, Paul A.; Haarberg, Geir Martin
Data(s)

01/06/2013

Resumo

<p>The oxygen reduction reaction (ORR) activity of Pt/C catalysts was investigated in electrolytes of 0.5 mol/L H2SO4 containing varying concentrations of methanol in a half-cell. It was found that the ORR activity was improved notably in an electrolyte of 0.5 mol/L H2SO4 containing 0.1 mol/L CH3OH as compared with that in 0.5 mol/L H2SO4, 0.5 mol/L H2SO4 containing 0.5 mol/L CH3OH, or 0.5 mol/L H2SO4 containing 1.0 mol/L CH3OH electrolytes. The same tendency for improved ORR activity was also apparent after commercial Nafion (R) NRE-212 membrane was hot-pressed onto the catalyst layers. The linear sweep voltammetry results indicate that the ORR activities of the Pt/C catalyst were almost identical in the 0.5 mol/L H2SO4 + 0.1 mol/L CH3OH solution before and after coated with the Nafion (R) membrane. Electrochemical impedance spectroscopy results demonstrated that the resistance of the Nafion (R) membrane is smaller in the electrolyte of 0.5 mol/L H2SO4 + 0.1 mol/L CH3OH than in other electrolytes with oxygen gas feed. This exceptional property of the Nafion (R) membrane is worth investigating and can be applied in fuel cell stacks to improve the system performance. (c) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.</p>

Identificador

http://pure.qub.ac.uk/portal/en/publications/effect-of-methanol-concentration-on-oxygen-reduction-reaction-activity-of-ptc-catalysts(f1ed7eb8-c1b3-4dd3-a78c-565c113ab751).html

http://dx.doi.org/10.1016/S1872-2067(11)60480-4

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Tang , S-H , Lin , W , Christensen , P A & Haarberg , G M 2013 , ' Effect of methanol concentration on oxygen reduction reaction activity of Pt/C catalysts ' Chinese journal of catalysis , vol 34 , no. 6 , pp. 1105-1111 . DOI: 10.1016/S1872-2067(11)60480-4

Palavras-Chave #Platinum #Carbon #Methanol crossover #Oxygen reduction #Fuel cell #FUEL-CELLS #IMPEDANCE SPECTROSCOPY #ELECTROCATALYSTS #NANODENDRITES #MEMBRANE #SUPPORTS
Tipo

article