Redox Tuning in Crystalline and Electronic Structure of Bimetal-Organic Frameworks Derived Cobalt/Nickel Boride/Sulfide for Boosted Faradaic Capacitance.

Author(s) Wang, Q.; Luo, Y.; Hou, R.; Zaman, S.; Qi, K.; Liu, H.; Park, H.Seok; Xia, B.Yu
Journal Adv Mater
Date Published 2019 Dec

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.

DOI 10.1002/adma.201905744
ISSN 1521-4095
Citation Adv Mater Weinheim. 2019;31(51):e1905744.

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