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چکیده
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In this study, different core@shell nanoparticles such as Ni@Pt, Ni@Pd and Ni@Ru on reduced graphene oxid (rGO) were synthesized using a two-step successive reduction method with sodium borohydride and ethylen glycol as reducing agents. The obtained electrocatalysts were characterized using field emission scannin electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electro microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The hydrazine oxidation on Ni@Pt/rGO Ni@Pd/rGO and Ni@Ru/rGO electrocatalysts was studied in a three electrode set-up. The results showed tha the hydrazine oxidation current density on Ni@Pd/rGO (19 722 A g1 ) is 1.31 and 3.21 times higher than those o Ni@Pt/rGO (15 030 A g1 ) and Ni@Ru/rGO (6140 A g1 ), respectively. The activation energy for hydrazin oxidation on Ni@Pd/rGO (7.1 kJ mol 1 ) is lower than that on Ni@Pt/rGO (14.2 kJ mol 1 ) and Ni@Ru/rGO (28.4 kJ mol 1 ). Also, the influence of Ni@Pt/rGO, Ni@Pd/rGO and Ni@Ru/rGO as an anodic electrocatalyst on the performance of direct hydrazine–hydrogen peroxide fuel cells (DHHPFCs) wa investigated. The single fuel cell results showed that Ni@Pd/rGO resulted in an improvement in powe density (204.79 mW cm2 ) equal to 10.03% and 47.32% with respect to Ni@Pt/rGO (186.12 mW cm2 and Ni@Ru/rGO (139.01 mW cm2 ), respectively.
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