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. 2020 Jul 10;10:11451. doi: 10.1038/s41598-020-67986-4

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© The Author(s) 2020

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(a) XRD pattern of as synthesis Cu foil electrode, Cu(OH)₂NWs, CuONWs and CuO NWs with GNP. (b) Low resolution of FESEM image of CuO NWs with GNP. (c) Moderate-resolution of FESEM image of CuO NWs with GNP. (d) High resolution of FESEM image of CuO NWs with GNP.