▎ 摘　　要

In this article, we present the formation of nitrogen (N) doped graphene oxide nanospheres (N-GONs) and investigate their applicability for photocatalytic water splitting. We chose a simple "bottom-up" method for synthesizing N-GONs. Dibenzopyrrole as a basic structural unit was used for constructing N-GONs. Nitration is an intermediate step, subsequent hydrothermal treatment of nitro derivatives imparted oxygen functionalities, which was well proved via CHNS and XPS analysis. similar to 14 % and 39 % of nitrogen and oxygen were present inside N-GONs. The average size of N-GONs is in-between 30-80 nm. N-GONs typically have a band gap of nearly 2.61 eV. The valance and the conduction bands alignments of N-GONs w.r.t to standard hydrogen electrode were evaluated through UPS and XPS studies. The alignments were found to be well suited for H2O splitting applications. N-GONs have n-type semiconductor features and a charge carrier density of 1.12x10(22) cm(-3). While studying photocatalytic dissociation of water we identified oxygen as the only product. Significantly, 1 g of N-GONs produced similar to 1.3 mmol of oxygen over the course of 1 h. These backgrounds clearly suggest the possibilities of ongoing oxygen reduction and oxygen evolution reactions simultaneously. No-significant traces of H2O2 were observed which suggested immediate H2O2 disproportionation to O-2 and H2O on N-GONs. The proposed photocatalytic activity of N-GONs is also confirmed by RRDE method for ORR catalysis.