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Hydrogen‐Bonding Reinforced Flexible Composite Electrodes for Enhanced Energy Storage

Hydrogen‐Bonding Reinforced Flexible Composite Electrodes for Enhanced Energy Storage The lack of advanced electrode materials is one of the main factors hindering the development of flexible rechargeable aqueous batteries (RABs) for high specific energy density and structural stability. It is also challenging to achieve high‐capacity performance for both the positive and negative electrodes simultaneously. Here, it is demonstrated that, by smartly designing the composite structures of positive and negative electrodes via one‐step electrodeposition strategy, the energy storage performance of the RAB is largely enhanced. For positive electrode material synthesis, Co‐Cu double hydroxides (Co‐Cu‐DH) nanosheets are skillfully rooted into electroreduced graphene oxide (eRG) via hydrogen bonding, in which graphene oxide reduction, Co‐Cu‐DH nucleation/growth, and formation of hydrogen bonding between Co‐Cu‐DH and eRG simultaneously occur. Moreover, when a RAB based on Co‐Cu‐DH@eRG//FeOOH@eRG using the same composite design strategy is established, a wide operating voltage window of ≈1.8 V, a high specific energy density of ≈142.8 Wh kg−1 at ≈890 W kg−1, and long‐term cyclic stability (88.5% of capacity retention after 12 000 cycles) are obtained. This study presents a general compositing strategy for the development of advanced electrode materials, and it is expected to stimulate future material synthesis/design in RABs toward the goal of high energy density storage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Functional Materials Wiley

Hydrogen‐Bonding Reinforced Flexible Composite Electrodes for Enhanced Energy Storage

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References (44)

Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
ISSN
1616-301X
eISSN
1616-3028
DOI
10.1002/adfm.202108003
Publisher site
See Article on Publisher Site

Abstract

The lack of advanced electrode materials is one of the main factors hindering the development of flexible rechargeable aqueous batteries (RABs) for high specific energy density and structural stability. It is also challenging to achieve high‐capacity performance for both the positive and negative electrodes simultaneously. Here, it is demonstrated that, by smartly designing the composite structures of positive and negative electrodes via one‐step electrodeposition strategy, the energy storage performance of the RAB is largely enhanced. For positive electrode material synthesis, Co‐Cu double hydroxides (Co‐Cu‐DH) nanosheets are skillfully rooted into electroreduced graphene oxide (eRG) via hydrogen bonding, in which graphene oxide reduction, Co‐Cu‐DH nucleation/growth, and formation of hydrogen bonding between Co‐Cu‐DH and eRG simultaneously occur. Moreover, when a RAB based on Co‐Cu‐DH@eRG//FeOOH@eRG using the same composite design strategy is established, a wide operating voltage window of ≈1.8 V, a high specific energy density of ≈142.8 Wh kg−1 at ≈890 W kg−1, and long‐term cyclic stability (88.5% of capacity retention after 12 000 cycles) are obtained. This study presents a general compositing strategy for the development of advanced electrode materials, and it is expected to stimulate future material synthesis/design in RABs toward the goal of high energy density storage.

Journal

Advanced Functional MaterialsWiley

Published: Jan 1, 2022

Keywords: flexible aqueous batteries; hydrogen bonding; one‐step electrodeposition synthesis; positive/negative electrodes composites; specific energy density

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