Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, P. R. China.
Guangxi Collaborative Innovation Center of Structure and Property for New Energy, School of Electronic Engineering and Automation, Guilin University of Electronic Technology (GUET), 1 Jinji Road, Guilin, 541000, P. R. China.
Adv Mater. 2019 Dec;31(51):e1905744. doi: 10.1002/adma.201905744. Epub 2019 Nov 8.
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 at 1 A g ), remarkable rate performance (802.9 F g at 20 A g ), 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 at a power density of 857.7 W kg , and capacity retention of 87.7% (up to 5000 cycles at 12 A g ). 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.
高效电极材料的开发是高性能储能器件的前沿方法。本文报道了一种有效的化学氧化还原方法，用于调整双金属钴/镍有机骨架（Co-Ni MOFs）的晶体和电子结构，以促进法拉第氧化还原反应，从而提高能量密度。所获得的钴/镍硼化物/硫化物表现出高比电容（在 1 A g 时为 1281 F g）、优异的倍率性能（在 20 A g 时为 802.9 F g）和出色的循环稳定性（在 10000 次循环后保持 92.1%）。使用钴/镍硼化物/硫化物电极制造的储能装置在 857.7 W kg 的功率密度下具有 50.0 Wh kg 的高能量密度，并且容量保持率为 87.7%（在 12 A g 下可达 5000 次循环）。这种有效的氧化还原方法实现了系统的电子调谐，激活了钴/镍硼化物/硫化物中金属物种的快速法拉第反应，这可能为储能器件中的 MOFs 及其衍生物提供重要启示。
