Facile synthesis of ternary Ag/C/SnO2 hollow spheres with enhanced activity for hydrazine electro-oxidation

摘要

Highly dispersed ternary Ag/C/SnO2 hollow spheres have been synthesized for hydrazine electro-oxidation. The sharp XRD peak of Ag shows that Ag nanoparticles of Ag/C/SnO2 have good crystallinity. SEM shows that Ag/C/SnO2 maintained a good spherical morphology with the diameter of about 300 nm. TEM shows that Ag nanoparticles with the average diameter of about 10 nm disperse well on C/SnO2. The advantages derived from C/SnO2 support including carbon, SnO2 and hollow structures may facilitate the dispersion of Ag and the close interaction of Ag with support. The results of hydrazine electro-oxidation show that C/SnO2 has no activity for hydrazine electro-oxidation while ternary Ag/C/SnO2 exhibits excellent electrocatalytic activity with the negative oxidation peak at 0.25 V (vs. SCE) and the high peak current of 473 mu A at the scan rate of 20 mV s(-1). The enhancement of activity may be attributed to the small size, homogeneous dispersion of Ag and the synergistic effect derived from Ag/C/SnO2 hollow spheres. (C) 2016 Elsevier B.V. All rights reserved.