Performance of a Direct Glycerol Fuel Cell using KOH Doped Polybenzimidazole as Electrolyte

نویسندگان

  • Ana P. Nascimento
  • José J. Linares
چکیده

Este trabalho mostra os resultados correspondentes ao estudo da influência das variáveis de operação (temperatura, concentração de glicerol, de KOH e vazão de alimentação) de uma célula a combustível de glicerol direto usando o polibenzimidazol (PBI) impregnado com KOH como eletrólito e Pt/C como catalisador. A temperatura mostra um efeito favorável até o valor limite de 75 °C, causado por melhoras na condutividade e na cinética. A concentração ótima do combustível que alimenta a célula é de 1 mol L em KOH 4 mol L, fornecendo suficiente quantidade de combustível e de eletrólito sem cruzamento massivo ao cátodo nem limitações de transferência de matéria. A vazão de alimentação melhora o desempenho até um valor limite de 2 mL min, suficiente para garantir o acesso do glicerol e a saída dos produtos. Finalmente, o uso de catalisadores binários (PtRu/C e Pt3Sn/C) resulta benéfico para incrementar o desempenho do sistema.

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تاریخ انتشار 2014