摘要
本文以钨酸钠和硫酸钾等试剂为原料,采用水热结合氨气氮化的方法原位获得了一种二维的氮化钨(WN)晶体,并将其作为氧还原(ORR)反应的催化剂.通过控制和优化制备条件(水热过程中硫酸钾含量、pH值以及氮化条件包括氮化温度和氮化时间),实现了纳米WN的可控制备.
A facile synthetic strategy was developed for insitu preparation of two-dimensional (2D)highly crystalline tungsten nitride (WN)nanosheets with controllable morphology as oxygen reduction reaction (ORR)catalysts.The dependence of the crystal structure and morphology of WN on K2SO4content,pH,and pyrolysis temperature was thoroughly examined.The electrocatalytic performance of WN toward ORR in an alkaline electrolyte indicated that K+plays an important role in the control of size and shape in the hydrothermal and nitridation process,thereby promoting the formation of plate-like WO3and 2D WN nanosheets.The WN nanosheets,with largely exposed edge sites,provide abundant catalytic active sites and allow fast charge transfer.Furthermore,they exhibit high stability for ORR and methanol tolerance.
基金
supported by the National Natural Science Foundation of China(21306119)
the Key Research and Development Projects in Sichuan Province(2017GZ0397,2017CC0017)
the Science and Technology Project of Chengdu(2015-HM01-00531-SF)
