Journal
INFOMAT
Volume 3, Issue 10, Pages 1134-1144Publisher
WILEY
DOI: 10.1002/inf2.12226
Keywords
2D quantum dots; flexible battery; metallic hybrids; oxygen electrochemistry; Zn-air battery
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1A3B2079803, 2020M2D8A2070866]
- Ministry of Education [NRF-2019R1A6A1A10073079]
- National Research Foundation of Korea [2020M2D8A2070866] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The electronically and chemically coupled LDH/MQD/NG hybrids modulate the local electronic and surface structure of the active LDH, providing metallic conductivity and abundant active sites, leading to significantly improved bifunctional activity and electrocatalytic kinetics.
Precise control of the local electronic structure and properties of electrocatalysts is important for enhancing the multifunctionality and durability of electrocatalysts and for correlating the structure/chemistry with the catalytic properties. Herein, we report electronically coupled metallic hybrids of NiFe layered double hydroxide nanosheet/Ti3C2 MXene quantum dots deposited on a nitrogen-doped graphene surface (LDH/MQD/NG) for high-performance flexible Zn-air batteries (ZABs). As verified from the Mott-Schottky and Nyquist plots, as well as spectroscopic, electrochemical, and computational analyses, the electronic and chemical coupling of LDH/MQD/NG modulates the local electronic and surface structure of the active LDH to provide metallic conductivity and abundant active sites, leading to significantly improved bifunctional activity and electrocatalytic kinetics. The rechargeable ZABs with LDH/MQD/NG hybrids are superior to the previous LDH-based ZABs, demonstrating a high power density (113.8 mW cm(-2)) and excellent cycle stability (150 h at 5 mA cm(-2)). Moreover, the corresponding quasi solid-state ZABs are completely flexible and practical, affording a high power density of 57.6 mW cm(-2) even in the bent state, and in real-life operation of tandem cells for powering various electronic devices.
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