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The effects of urea on microstructures of SnO2 during hydrothermal process and its supercapacitor performance were investigated. The sphere SnO2 was formed on Ti plate in hydrothermal solution without urea, while the SnO2 micro-flowers were assembled by numerous few-layered nanopetals due to adding to urea during hydrothermal process. The separated SnO2 nanopetals arrays showed better electrochemical...
A facile and efficient method was developed to prepare nitrogen-doped graphene hydrogels (NGHs) via a one-pot hydrothermal route with graphene oxide (GO) and urea. In the procedure, urea was used as a reducing-doping agent to continuously release NH3, and N element of which was doped into graphene lattice by three styles (pyridinic N, pyrrolic N, and graphitic/quaternary N). The NGHs have high nitrogen...
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