Co supported on N and S dual-doped reduced graphene oxide as highly active oxygen-reduction catalyst for direct ethanol fuel cells
EntityUAM. Departamento de Química Física Aplicada
10.1016/j.cej.2023.142053Chemical Engineering Journal 461 (2023): 142053
Funded byThis work has been developed in the framework of the projects PID2020-117586RB-100, PID2020-112594RB-C33, PID2020- 116712RBC21 funded by MCIN/AEI/10.13039/501100011033, and ProID2021010098 funded by the Gobierno de Canarias (FEDER). S. Fajardo acknowledge the MCIN for the pre-doctoral grant (PRE2018- 085718). The authors thank SEGAI-ULL for the collaboration
ProjectGobierno de España. PID2020-112594RB-C33; Gobierno de España. PID2020-117586RB-100; Gobierno de España. PID2020-116712RB-C21
SubjectsDirect ethanol fuel cell; Heteroatom-doped graphene materials, non-noble metal catalyst; Oxygen reduction reaction; Reduced graphene oxide; Física; Química
Rights© 2023 The Authors
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
Oxygen reduction reaction (ORR) is one of the key features for the efficient functioning of several energy conversion devices such as fuel cells, appearing the necessity of development of new low-cost catalyst materials. Heteroatom-doped carbon materials have attracted attention in this field due to its physicochemical and electronic properties. In this work, a nitrogen and sulfur doped material with anchored Co3O4 nanoparticles (Co/SN-rGO) is proposed as cathode catalyst for direct ethanol fuel cells (DEFCs) and results are compared with different doped graphene nanomaterials (GMs). The effect of the heteroatoms and cobalt oxide nanoparticles in the final efficiency was studied. Synthesized materials were characterized and the activity of Co/SN-rGO and GMs for the ORR was studied. Co/SN-rGO presents high ORR performance in terms of onset potential (Eonset), 0.86 V (vs RHE) and half-wave potential (E1/2) 0.72 V (vs RHE). Tafel analysis shows 60 mV dec-1 at low overpotential for potential dependent ORR mechanism. Besides, when Co/SN-rGO performance is evaluated in a DEFC using a fuel cell test station, main results indicate higher catalytic activity, stability, and ethanol tolerance of Co/SN-rGO in comparison to a carbon-supported Pt catalyst
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