Realization of High Energy Density Sodium-Ion Hybrid Capacitors through Interface Engineering of Pseudocapacitive 3D-CoO-NrGO Hybrid Anodes

Sodium-ion hybrid capacitors (SHCs) have attracted great attention owing to the improved power density and cycling stability in comparison with sodium-ion batteries. Nevertheless, the energy density (

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Published in:ACS applied materials & interfaces 2021-06, Vol.13 (24), p.27999-28009
Main Authors: Feng, Wenliang, Avvaru, Venkata Sai, Maça, Rudi Ruben, Hinder, Steven J, Rodríguez, Miguel Castillo, Etacheri, Vinodkumar
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Language:English
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Energy, Environmental, and Catalysis Applications
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cited_by cdi_FETCH-LOGICAL-a307t-dc1cbac3175d80d460460b9b4cf5944bf58da850fa6ec0fd19b82a68f09e2c863
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container_end_page 28009
container_issue 24
container_start_page 27999
container_title ACS applied materials & interfaces
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creator Feng, Wenliang
Avvaru, Venkata Sai
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Etacheri, Vinodkumar
description Sodium-ion hybrid capacitors (SHCs) have attracted great attention owing to the improved power density and cycling stability in comparison with sodium-ion batteries. Nevertheless, the energy density (
doi_str_mv 10.1021/acsami.1c01207
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Nevertheless, the energy density (&lt;100 Wh·kg–1) is usually limited by low specific capacity anodes (&lt;150 mAh·g–1) and “kinetics mismatch” between the electrodes. Hence, we report a high energy density (153 Wh·kg–1) SHC based on a highly pseudocapacitive interface-engineered 3D-CoO-NrGO anode. This high-performance anode (445 mAh·g–1 @0.025 A·g–1, 135 mAh·g–1 @5.0 A·g–1) consists of CoO (∼6 nm) nanoparticles chemically bonded to the NrGO network through Co–O–C bonds. Exceptional pseudocapacitive charge storage (up to ∼81%) and capacity retention (∼80% after 5000 cycles) are also identified for this SHC. Excellent performance of the 3D-CoO-NrGO anode and SHC is owing to the synergistic effect of the CoO conversion reaction and pseudocapacitive sodium-ion storage induced by numerous Na2O/Co/NrGO nanointerfaces. Co–O–C bonds and the 3D microstructure facilitating efficient strain relaxation and charge-transfer correspondingly are also identified as vital factors accountable for the excellent electrochemical performance. 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Mater. Interfaces</addtitle><date>2021-06-23</date><risdate>2021</risdate><volume>13</volume><issue>24</issue><spage>27999</spage><epage>28009</epage><pages>27999-28009</pages><issn>1944-8244</issn><eissn>1944-8252</eissn><abstract>Sodium-ion hybrid capacitors (SHCs) have attracted great attention owing to the improved power density and cycling stability in comparison with sodium-ion batteries. Nevertheless, the energy density (&lt;100 Wh·kg–1) is usually limited by low specific capacity anodes (&lt;150 mAh·g–1) and “kinetics mismatch” between the electrodes. Hence, we report a high energy density (153 Wh·kg–1) SHC based on a highly pseudocapacitive interface-engineered 3D-CoO-NrGO anode. This high-performance anode (445 mAh·g–1 @0.025 A·g–1, 135 mAh·g–1 @5.0 A·g–1) consists of CoO (∼6 nm) nanoparticles chemically bonded to the NrGO network through Co–O–C bonds. Exceptional pseudocapacitive charge storage (up to ∼81%) and capacity retention (∼80% after 5000 cycles) are also identified for this SHC. Excellent performance of the 3D-CoO-NrGO anode and SHC is owing to the synergistic effect of the CoO conversion reaction and pseudocapacitive sodium-ion storage induced by numerous Na2O/Co/NrGO nanointerfaces. Co–O–C bonds and the 3D microstructure facilitating efficient strain relaxation and charge-transfer correspondingly are also identified as vital factors accountable for the excellent electrochemical performance. The interface-engineering strategy demonstrated provides opportunities to design high-performance transition metal oxide-based anodes for advanced SHCs.</abstract><pub>American Chemical Society</pub><doi>10.1021/acsami.1c01207</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-7856-6800</orcidid><orcidid>https://orcid.org/0000-0001-8287-0621</orcidid><orcidid>https://orcid.org/0000-0001-8406-4738</orcidid></addata></record>
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title Realization of High Energy Density Sodium-Ion Hybrid Capacitors through Interface Engineering of Pseudocapacitive 3D-CoO-NrGO Hybrid Anodes
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