Highly efficient electrocatalytic hydrogen evolution over edge-modified phosphorene quantum dot/prussian blue skeleton structure

Facile liquid precipitation method assisted by liquid phase stripping has been used to prepare phosphorene quantum dot modified prussian blue porous skeleton structure. In this structure, the CN- group in prussian blue has larger chemical electronegativity than phosphorus atom, which can not only passivate the edges of phosphorene nanostructure, but also desire the valence band maximum and conduction band minimum band edge positions of black phosphorus for hydrogen generation in electrocatalytic water splitting. Moreover, the prussian blue porous network can be used as the support for phosphorene quantum dot and the medium for electron transport. This prussian blue supported phosphorene quantum dot porous network exhibits enhanced electrocatalytic hydrogen evolution performance with an over-potential of 148 mV at -10 mA cm(-2) and a Tafel slope of 79 mV dec(-1), which drastically surpass those of the black phosphorus. In addition, both the consecutive cyclic voltammetry and potentiostatic test reveal the outstanding electrocatalytic stability of the composite. This construction based on edge-modified phosphorene nanostructure presents efficient electrocatalys activity for water splitting. (C) 2019 Elsevier Inc. All rights reserved.