Clean synthesis of biocarbon-supported Ni@Pd core–shell particles via hydrothermal method for direct ethanol fuel cell anode application
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Direct ethanol fuel cells (DEFCs) are devices for clean and sustainable energy production, where the generation of electrical energy occurs as a result of the anodic ethanol oxidation reaction (EOR). One of the main challenges of these devices is the development of cost-effective and sustainable anodic catalysts, minimizing the use of noble metals such as Pd. In this sense, biomass-derived carbon-supported core–shell nanoparticles of PdNi-based electrocatalyst are of great interest for EOR and its application in DEFCs. The purpose of this work was to demonstrate the possibility of synthesizing a core–shell Ni@Pd electrocatalysts via hydrothermal method, in a fast, simple and environmental friendly way. A biomass hydrothermal liquefaction method using nickel and palladium salts was used to synthesize a biocarbon-supported nickel/palladium core–shell electrocatalyst (Ni@Pd/aHC). The electrocatalyst was morphological and chemical characterized in order to confirm the core–shell particle formation. The electrochemical characterization showed that the Ni@Pd/aHC sample has good electrocatalytic behaviour and good stability over time. The EOR mechanism on the sample and their influence in the faradaic efficiency of a cell were also studied by spectroelectrochemical analysis.
KeywordsNi@Pd core–shell Hydrothermal synthesis Biomass residues Ethanol oxidation reaction In situ ATR-FTIRS
This work was funded by the Brazilian CNPq and CAPES foundation. E. Leal da Silva thanks the Brazilian CNPq (Bolsista CNPq/Brasil 152027/2016-5—PDJ) and the Uruguayan Comisión Académica de Posgrado (CAP)-Udelar for the Postdoctoral Fellowship (2018–2020). A. Cuña thanks the CSIC-UdelaR for financial support. C. Reyes Plascencia gratefully acknowledges the National Council of Science and Technology in Mexico (CONACYT) for her Ph.D. scholarship. The authors thank Leopoldo Suescun from Cryssmat-Lab/DETEMA for XRD measurements.
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