材料科学
法拉第效率
硫化物
硫化钴
钴
氧化还原
硼化物
双金属片
化学工程
储能
硫化镍
镍
电极
超级电容器
电容
无机化学
电化学
冶金
金属
化学
物理化学
功率(物理)
工程类
物理
量子力学
作者
Qingyong Wang,Yumei Luo,Ruizuo Hou,Shahid Zaman,Kai Qi,Hongfang Liu,Ho Seok Park,Bao Yu Xia
标识
DOI:10.1002/adma.201905744
摘要
The development of efficient electrode materials is a cutting-edge approach for high-performance energy storage devices. Herein, an effective chemical redox approach is reported for tuning the crystalline and electronic structures of bimetallic cobalt/nickel-organic frameworks (Co-Ni MOFs) to boost faradaic redox reaction for high energy density. The as-obtained cobalt/nickel boride/sulfide exhibits a high specific capacitance (1281 F g-1 at 1 A g-1 ), remarkable rate performance (802.9 F g-1 at 20 A g-1 ), and outstanding cycling stability (92.1% retention after 10 000 cycles). An energy storage device fabricated with a cobalt/nickel boride/sulfide electrode exhibits a high energy density of 50.0 Wh kg-1 at a power density of 857.7 W kg-1 , and capacity retention of 87.7% (up to 5000 cycles at 12 A g-1 ). Such an effective redox approach realizes the systematic electronic tuning that activates the fast faradaic reactions of the metal species in cobalt/nickel boride/sulfide which may shed substantial light on inspiring MOFs and their derivatives for energy storage devices.
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