材料科学
超级电容器
合理设计
复合数
金属
析氧
电化学
化学工程
制作
氧气
金属有机骨架
双金属片
纳米技术
电容
电解质
石墨烯
电极
阴极
催化作用
储能
循环伏安法
复合材料
氧化物
阳极
作者
Dengke Xiong,Minli Gu,Chen Chen,Chunxiao Lü,Fei–Yan Yi,Xinghua Ma
标识
DOI:10.1016/j.cej.2020.127111
摘要
Developing highly efficient and stable multi-functional metal–organic framework electrochemical materials is of prime importance for renewable energy technologies and electrocatalytic applications. Herein, a novel series of bimetallic metal–organic framework (MOF) hybrid materials were successfully designedly fabricated through an in-situ growth and MOF-on-MOF strategies, namely as NiFeMOF/NF, NiCoMOF/NF, FeMOF/NiMOF/NF, and CoMOF/NiMOF/NF. Benefiting from the synergistic effect of bimetallic centers, conductive substrate and unique fabrication, they exhibit remarking electrochemical performance. Among them, FeMOF/NiMOF/NF composite with ultrathin nanosheets displays the best electrochecatalytic performance with ultralow overpotentials of 293 mV at 50 mA cm−2 and 359 mV at 100 mA cm−2 for oxygen evolution reaction (OER), and remarking electrochemical stability with high current density of 100 mA cm−2 after testing for 24 h, that 88% of initial current density can be remained. Based on these fabricated bimetallic MOF hybrid materials as precursors, the corresponding MOF-derived nano sulfides were obtained with massive exposure of active sites. As an excellent supercapacitor electrode, NiCoS/NF-1 converted from CoMOF/NiMOF/NF shows admirable specific capacitance of 2815.4 F g−1 at 1 mA cm−2 and a remarkable rate capability of 82%.
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