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. 2022 Jan 20;14(3):417. doi: 10.3390/polym14030417

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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(a) The effect of KOH concentration (see legend) and initiator concentration on polymerization rate. In the experiments, 4 wt.% of initiator was used. (b) Effect of initiator concentration on the polymerization rate. (c) Effect of monomer (acrylic acid) concentration on the polymerization rate. (d) Effect of dissolved ZnO amount on the gassing rate of the Zn powder. (e) Effect of electrolyte additives in the hydrogel electrolyte on the hydrogen generation, which is measured through bubble activity.