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. 2020 Oct 24;10(11):2115. doi: 10.3390/nano10112115

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© 2020 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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(a) The double-layer capacitance (C_dl) calculated by liner fitting of the capacitive currents of different catalysts versus scan rate. (b–d) Cyclic voltammograms of NiS₂ prepared by different experimental schemes.