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. 2021 Jan 13;16:11. doi: 10.1186/s11671-020-03469-9

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© The Author(s) 2021

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Fig. 1 — a XRD patterns of Co₂P NPs prepared at different temperatures for 12 h. b Transmission electron microscopic image and high-resolution transmission electron microscopic image (inset) of Co₂P NPs. XPS spectra of Co₂P in the c Co 2p region and d P 2p region