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Redox Tuning in Crystalline and Electronic Structure of Bimetal–Organic Frameworks Derived Cobalt/Nickel Boride/Sulfide for Boosted Faradaic Capacitance
Author(s) -
Wang Qingyong,
Luo Yumei,
Hou Ruizuo,
Zaman Shahid,
Qi Kai,
Liu Hongfang,
Park Ho Seok,
Xia Bao Yu
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905744
Subject(s) - materials science , cobalt sulfide , sulfide , faraday efficiency , nickel , cobalt , capacitance , redox , chemical engineering , bimetallic strip , energy storage , boride , nickel sulfide , supercapacitor , inorganic chemistry , electrode , electrochemistry , metallurgy , metal , chemistry , power (physics) , physics , quantum mechanics , engineering
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.