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. 2020 Aug 3;10:13032. doi: 10.1038/s41598-020-70031-z

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© The Author(s) 2020

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(a) The pressing and releasing peaks in a single tapping, (b) the amount of transferred charge versus RH during releasing, (c) variation of open-circuit voltage and (d) short-circuit current by increasing RH, (e) variation of open-circuit voltage and (f) short-circuit current and (g,h) the corresponding recovery time diagrams by disconnecting RH.