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. 2017 Apr 6;7:46154. doi: 10.1038/srep46154

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High-resolution XPS spectra of the (a) Ni 2p and (b) O 1s regions for the Ni(OH)₂, Ni_2.1Zn(OH)_x, and Ni_2.2Fe(OH)_x HNAs (from bottom to top); (c) Zn 2p spectra of the Ni_2.1Zn(OH)_x HNAs, (d) Fe 2p spectra of the Ni_2.2Fe(OH)_x HNAs.