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. 2021 Jan 27;11(2):319. doi: 10.3390/nano11020319

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Charge/discharge curves of (a) Ge/GeO₂ NPs and (b) Ge/GeO₂/MRGO (at a current density of 100 mA/g), and (c) their cycling performances. Charge/discharge curves of (d) Ge/GeO₂ NPs and (e) Ge/GeO₂/MRGO at current densities of 100, 300, 500, 700, 900, and 1000 mA/g for 5 successive cycles (after 30 cycles the current density was reverted back to 100 mA/g), and (f) their cycling performance and rate capability.