标题：3D Porous Nickel-Cobalt Nitrides Supported on Nickel Foam as Efficient Electrocatalysts for Overall Water Splitting
作者：Wang, Yueqing; Zhang, Baohua; Pan, Wei; Ma, Houyi; Zhang, Jintao
作者机构：[Wang, Yueqing; Zhang, Baohua; Ma, Houyi; Zhang, Jintao] Shandong Univ, State Educ Minist, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Jin 更多
通讯作者地址：[Ma, HY; Zhang, JT]Shandong Univ, State Educ Minist, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China.
关键词：electrocatalysis; hydrogen evolution reaction; nitrides; oxygen; evolution reaction; water splitting
摘要：Exploring highly efficient and durable bifunctional electrocatalysts from earth-abundant low-cost transition metals is central to obtaining clean hydrogen energy through large-scale electrolytic water splitting. Porous nickel-cobalt nitride nanosheets on macroporous Ni foam (NF) are synthesized through facile electrodeposition followed by a one-step annealing process in a NH3 atmosphere. The transformation from a metal hydroxide into a metal nitride could efficiently enhance the electrocatalytic performance for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Interestingly, the incorporation of nickel further boosts the catalytic activity of cobalt nitride. When used as bifunctional electrocatalysts, the obtained nickel-cobalt nitride electrocatalyst shows good stability and superior catalytic performance toward both HER and OER with low overpotentials of 0.29 and 0.18 V, respectively, to achieve a current density of 10 mA cm(-2). The good electrocatalytic performance was also evidenced by the fabrication of an electrolyzer for overall water splitting, which exhibits a high gas generation rate for hydrogen and oxygen with excellent stability during prolonged alkaline water electrolysis. The present work provides an efficient approach to prepare a 3 D interconnected porous nickel-cobalt nitride network with exposed inner active sites for overall water splitting.