2026-04-19T06:34:26Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110982025-11-26T01:05:34Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Temperature dependent performance and catalyst layer properties of PtRu supported on modified few-walled carbon nanotubes for the alkaline direct ethanol fuel cell Kanninen, Petri Borghei, Maryam Hakanpää, Janina Kauppinen, Esko I. Ruiz Fernández, Virginia Kallio, Tanja Ethanol Few-walled carbon nanotube Nitrogen Direct ethanol fuel cell Catalyst layer Alkaline electrolyte The performance of PtRu on three differently modified few-walled carbon nanotube (FWCNT) supports for ethanol electro-oxidation is evaluated in alkaline media both with rotating disc electrode (RDE) and direct ethanol fuel cell (DEFC) measurements at various temperatures (0–60 °C). FWCNT are modified with oxidative treatment (O-FWCNT), aniline coating (A-FWCNT) and N-doped carbon layer (N-FWCNT). RDE testing shows that A-FWCNT/PtRu outperforms both O-FWCNT/PtRu and N-FWCNT/PtRu especially at high temperatures giving 1.5 times higher current at 60 °C. The poisoning resistance of N-FWCNT/PtRu is high over the temperature range, while O-FWCNT/PtRu and A-FWCNT/PtRu become increasingly poisoned with increasing temperature. Alkaline DEFC testing at 30 °C and 50 °C indicates similar dependence to temperature as in RDE tests. However, only N-FWCNT/PtRu can sustain currents for longer than 20–30 h during constant voltage measurement. SEM images of the catalyst layers reveal that both O-FWCNT/PtRu and A-FWCNT/PtRu form a dense structure with little pores for reactant and product transport explaining the quick performance loss, while large pores are formed with N-FWCNT/PtRu facilitating the transport. These results underline that the interactions between the catalyst support and the ionomer in the fuel cell catalyst layer are important in forming a suitable pore structure for efficient mass transfer. 2025-11-25T09:56:36Z 2025-11-25T09:56:36Z 2025-11-25T09:56:36Z 2017-05 info:eu-repo/semantics/article 1572-6657 https://hdl.handle.net/10259/11098 10.1016/j.jelechem.2016.10.019 eng Journal of Electroanalytical Chemistry. 2017, V. 793, p. 48-57 https://doi.org/10.1016/j.jelechem.2016.10.019 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier