Controllable synthesis of two-dimensional tungsten nitride nanosheets as electrocatalysts for oxygen reduction reaction

摘要: A facile synthetic strategy was developed for in-situ preparation of two-dimensional (2D) highly crystalline tungsten nitride (WN) nanosheets with controllable morphology as oxygen reduction reaction (ORR) catalysts. The dependence the crystal structure and WN on K2SO4 content, pH, pyrolysis temperature thoroughly examined. electrocatalytic performance toward ORR in an alkaline electrolyte indicated that K+ plays important role control size shape hydrothermal nitridation process, thereby promoting formation plate-like WO3 2D nanosheets. nanosheets, largely exposed edge sites, provide abundant catalytic active sites allow fast charge transfer. Furthermore, they exhibit high stability methanol tolerance.