info:eu-repo/semantics/article
High durability fuel cell cathodes obtained from cobalt metal organic frameworks
Fecha
2019-10Registro en:
Diaz Duran, Ana Katherine; Viva, Federico Andres; Roncaroli, Federico; High durability fuel cell cathodes obtained from cobalt metal organic frameworks; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 320; 10-2019; 1-8
0013-4686
CONICET Digital
CONICET
Autor
Diaz Duran, Ana Katherine
Viva, Federico Andres
Roncaroli, Federico
Resumen
Mesoporous carbons doped with Nitrogen and Cobalt were obtained from the pyrolysis of two different Cobalt Metal-Organic Frameworks (MOFs, ZIF-67 and CoNic) and from one linear coordination polymer (CP, Co(CO2)2Pz). (ZIF-67 = catena-(bis(μ2-2-methylimidazolato)-cobalt(II), CoNic = catena-(bis(μ3-nicotinato)-bis(μ2-nicotinato)-(μ2-aqua)-di-cobalt(II), Co(CO2)2Pz = catena-((μ2-pyrazine-2,3-dicarboxylato)-diaqua-cobalt(II) dehydrate). The carbonization products were evaluated as cathode catalysts in polymer electrolyte membrane fuel cell (PEMFC). Membrane Electrode Assemblies (MEAs) prepared with the Co–N doped carbons and Pt 20% supported on Vulcan carbon as anode catalyst, were characterized in a PEMFC and post mortem by SEM, EDX, XPS and X-ray diffraction. The best catalyst was the one derived from the Co(CO2)2Pz polymer, pyrolyzed at 700 °C and acid leached. It reached a maximum power density of 259 mW cm−2, a limiting current of 1.36 A cm−2 and an open cell voltage of 0.86 V. These parameters are comparable to those of Pt 20% on Vulcan. The fuel cell prototype constructed with the Co(CO2)2Pz 700 °C material was able to operate for 500 h, without significant change of its electrochemical parameters and without leaking Co or Pt.