Scheme 1. Schematic Illustration of the Adsorption Route of Urea/Hydroxyl on NiO@Graphene.
(I) Adsorption of the hydroxyl group first; (II) adsorption of urea first (gray for C, red for O, blue for N, white for H, and light blue for Ni atoms).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.