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. 2020 Nov 5;10:19195. doi: 10.1038/s41598-020-75851-7

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© The Author(s) 2020

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SEM micrographs (a–d) and (e) Raman spectrum took from BP electrodes. The inset in (a) shows a photo of the as-prepared flexible BP disc electrode used in the CR2032 coin cell.