Unraveling the Hydrogen Evolution Reaction Active Sites in N-Functionalized Interconnected Graphene Quantum Dots

作者：Kundu Sumana; Malik Bibhudatta; Pattanayak Deepak K; Pitchai Ragupathy; Pillai Vijayamohanan K

来源：ChemistrySelect, 2017, 2(16): 4511-4515.

DOI：10.1002/slct.201700631

<jats:title>Abstract</jats:title><jats:p>Herein, we report for the first time, a unique three‐ dimensionally (3‐D) interconnected and surface N functionalized (25%) graphene quantum dots (c‐GQDs), which has been designed by a simple hydrazine hydrate treatment of GQDs in acidic condition at low temperature followed by a heat treatment that has remarkably enhanced electrocatalytic activity. A comparable exchange current density (i<jats:sub>0</jats:sub>: 0.8×10<jats:sup>−3</jats:sup> A/cm<jats:sup>2</jats:sup>) with respect to the Pt/C and a low overpotential (220 mV; η<jats:sub>10mA/cm</jats:sub><jats:sup>2</jats:sup>) has been observed for c‐GQDs. The improved performance of the material is attributed to the unique structure of the N‐interlinkage among the individual GQDs where the pyridinic‐N‐oxide develops electron rich active sites in the carbon framework for favourable H<jats:sup>+</jats:sup> adsorption and desorption. We hope that our study may build up a new platform to the graphene based materials for various energy applications.</jats:p>

• 出版日期2017-5-31