Study of formation features and electrochemical properties of Ge-Co nanocomposite on copper substrate

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In this work, we have demonstrated for the first time the possibility of electrochemical formation of Ge-Co nanostructures on a copper substrate, which are globules whose size reaches 1 μm, consisting of smaller particles whose size does not exceed 10 nm. Such nanostructures demonstrate a sufficiently high reversible capacity of about 850 mAh/g and good stability under long-term cycling.

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作者简介

I. Gavrilin

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: gavrilin.ilya@gmail.com
俄罗斯联邦, Moscow, 119071

I. Marinkin

National Research University “MIET”

Email: gavrilin.ilya@gmail.com
俄罗斯联邦, Moscow, Zelenograd, 124498

Y. Kudryashova

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: gavrilin.ilya@gmail.com
俄罗斯联邦, Moscow, 119071

Е. Kovtushenko

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: gavrilin.ilya@gmail.com
俄罗斯联邦, Moscow, 119071

T. Kulova

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: tkulova@mail.ru
俄罗斯联邦, Moscow, 119071

А. Skundin

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: gavrilin.ilya@gmail.com
俄罗斯联邦, Moscow, 119071

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2. Fig. 1. Cyclic voltammetry recorded in 0.01 M InCl3 + 0.5 M C6H8O7 solution using copper substrate. The potential sweep rate is 5 mV/s.

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3. Fig. 2. SEM images of the surface of the samples obtained at different deposition times: a) 5 s, b) 15 s, c) 30 s, d) 60 s. The insets show SEM images at lower magnification. The inserts show SEM images at lower magnification.

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4. Fig. 3. Cyclic voltammetry recorded in different solutions using copper substrate with deposited indium layer. The types of solutions are indicated in the figure.

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5. Fig. 4. SEM images of the surface of the sample obtained after electrochemical deposition from GeCo solution at different magnifications: a) 15,000x and b) 400,000x.

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6. Fig. 5. Charge-discharge curves (a), variation of discharge capacity and Coulomb efficiency (b) during lithium introduction/extraction to/from Ge-Co nanostructure. The charge/discharge current is 250 mA/g.

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