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Charge-Transfer Effects of Organic Ligands on Energy Storage Performance of Oxide Nanoparticle-Based Electrodes

Authors
Song, YongkwonLee, SeokminKo, YongminHuh, JuneKim, YongjuYeom, BongjunMoon, Jun HyukCho, Jinhan
Issue Date
1월-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
chemical reducing ligands; energy storage; pseudocapacitors
Citation
ADVANCED FUNCTIONAL MATERIALS, v.32, no.2
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED FUNCTIONAL MATERIALS
Volume
32
Number
2
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135362
DOI
10.1002/adfm.202106438
ISSN
1616-301X
Abstract
One of the most difficult challenges related to pseudocapacitive nanoparticle (PC NP)-based energy storage electrodes with theoretically high capacity is to overcome the sluggish charge-transfer kinetics that result from the poorly conductive PC NPs and bulky/insulating organics (i.e., organic ligands and/or polymeric binders) within the electrodes. Herein, it is reported that physical/chemical functionalities of organic ligands and their molecular-scale coating onto NPs have considerable effects on the rate capability and capacity of oxide NP-based pseudocapacitor electrodes. For this study, pseudocapacitive iron oxide (Fe3O4) NPs are layer-by-layer (LbL)-assembled with conductive indium tin oxide (ITO) NPs using various types of organic ligands (or linkers). In particular, hydrazine ligands, which have extremely small molecular size and strong chemical reducing properties, can effectively remove bulky organic ligands from the NP surface, and thus reduce the separation distance between neighboring NPs. Simultaneously, the hydrazine ligands significantly increase the number of oxygen vacancies on Fe3O4 and ITO NPs during LbL deposition, which markedly enhances the rate capability and capacitance of the electrodes compared to other organic ligands with bulky size and/or without reducing properties. This approach can provide a fundamental basis for developing and designing various high-performance electrochemical electrodes based on metal oxide NPs.
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공과대학 (화공생명공학과)
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