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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 (https://creativecommons.org/licenses/by/4.0/).
(a) The charge-discharge capacity curves of the Bi-GF electrode at different current densities; (b) voltage efficiency; (c) energy efficiency; (d) electrolyte utilization rate of Bi-GF and GF electrodes at different current densities.