Beilstein Arch. 2019, 2019113. https://doi.org/10.3762/bxiv.2019.113.v1
Published 01 Oct 2019
Magnesium based secondary batteries have been regarded as a viable alternative compared to the immensely popular Li-ion systems owing to its high volumetric capacity. One of the largest challenges is the selection of Mg anode material since the insertion/extraction processes are kinetically slow because the large ionic radius and high charge density of Mg2+ compared with Li+.
We prepared very thin films of Sb by electrodeposition on an Au (111) substrate. Monolayer and multilayer deposition (up to 20 Monolayer) were characterized by cyclic voltammetry and STM (Scanning-Tunneling-Microscope). Monolayer deposition results in a characteristic row structure; the monolayer is commensurate in one dimension, but not in the other. The row structure is to some extent maintained after deposition of further layers. After dissolution of the multilayers of Sb the substrate is roughened on the atomic scale due to alloy formation, as demonstrated by CV and STM. Further multilayer deposition correspondingly leads to rough deposit with protrusion of up to 3 nm.
The cyclic voltammogram for Mg insertion/de-insertion from MgCl2/AlCl3/Tetraglyme (MACC/TG) electrolyte into/from Sb modified electrode shows a positive shift (400 mV) of the onset potential of Mg deposition compared to that at bare Au electrode. From the charge of Mg deposition, we find that the ratio of Mg to Sb is 1:1; and this somewhat less than expected for the Mg3Sb2 alloy.
Keywords: insertion/extraction, electrodeposition, alloy, STM, Au(111), antimony
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Lingxing, Z.; Xing, D.; Abd-El-Latif, A.; Baltruschat, H. Beilstein Arch. 2019, 2019113. doi:10.3762/bxiv.2019.113.v1
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