Surfactant-free polyol synthesis of effective Pd-Cu nanomaterials for H2/O2 solid polymer electrolyte fuel cells
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This study presents a facile synthesis of carbon-supported binary palladium-copper (Pd-Cu/C) nanomaterials designed to achieve competitive catalytic activity while reducing material costs in solid polymer electrolyte (SPE) fuel cells. A surfactant-free, microwave-heated polyol process is employed to synthesize Pd/C and Pd-Cu/C nanomaterials with mean particle size below 4.0 nm. The electrocatalytic activity toward the oxygen reduction reaction (ORR) and the corresponding kinetic parameters of Pd-Cu/C electrodes with varying compositions are systematically interrogated using rotating disk electrode (RDE) measurements. Notably, Tafel analysis reveals a slope of 60 ± 2 mV per decade at low current densities, indicating that the first electron transfer to molecular oxygen (O2) is the rate-determining step. At higher current densities, a slope of 144 ± 8 mV per decade suggests a transition to proton-coupled electron transfer as the dominant mechanism. Furthermore, electrochemical performance of membrane-electrode assemblies (MEAs) reveals a peak power density of 475 mW cm−2 with a Pd/C cathode under optimal operating conditions. However, increasing the Cu content in the Pd-Cu/C catalysts results in a marked decrease in current density, likely due to partial Cu dissolution. These findings highlight the potential of binary Pd-Cu nanomaterials as promising alternatives to platinum-based catalysts for Pt-free SPE fuel cell applications.
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ISIDORO, ROBERTA A.; KOKOH, KOUAKOU B.; SAHIN, NIHAT E.; FONSECA, FABIO C.; NAPPORN, TEKO W.; SANTIAGO, ELISABETE I. Surfactant-free polyol synthesis of effective Pd-Cu nanomaterials for H2/O2 solid polymer electrolyte fuel cells. ChemNanoMat, v. 12, n. 1, p. 1-13, 2025. DOI: 10.1002/cnma.202500324. Disponível em: https://repositorio.ipen.br/handle/123456789/49932. Acesso em: 10 Jun 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.