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Self-assembled nanostructures in ionic liquids facilitate charge storage at electrified interfaces

Mao, Xianwen ; Brown, Paul ; Červinka, Ctirad ; Hazell, Gavin ; Li, Hua ; Ren, Yinying ; Chen, Di ; Atkin, Rob ; Eastoe, Julian ; Grillo, Isabelle ; Padua, Agilio A H ; Costa Gomes, Margarida F ; Hatton, T Alan

Nature materials, 2019-12, Vol.18 (12), p.1350-1357 [Periódico revisado por pares]

England: Nature Publishing Group

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Título:
Self-assembled nanostructures in ionic liquids facilitate charge storage at electrified interfaces
Autor: Mao, Xianwen ; Brown, Paul ; Červinka, Ctirad ; Hazell, Gavin ; Li, Hua ; Ren, Yinying ; Chen, Di ; Atkin, Rob ; Eastoe, Julian ; Grillo, Isabelle ; Padua, Agilio A H ; Costa Gomes, Margarida F ; Hatton, T Alan
Assuntos: Charge density ; Chemical Sciences ; Domains ; Electrochemical analysis ; Electrochemistry ; Electrode polarization ; Electrodes ; Electrolytes ; ENERGY STORAGE ; Energy transfer ; Ion charge ; Ion distribution ; Ionic liquids ; Ions ; Molecular dynamics ; Molecular self-assembly ; or physical chemistry ; Sails ; Self assembly ; Theoretical and
É parte de: Nature materials, 2019-12, Vol.18 (12), p.1350-1357
Notas: AC02-76SF00515; 19-04150Y
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Czech Science Foundation
Science and Technology Facilities Council (STFC) (United Kingdom)
Descrição: Driven by the potential applications of ionic liquids (ILs) in many emerging electrochemical technologies, recent research efforts have been directed at understanding the complex ion ordering in these systems, to uncover novel energy storage mechanisms at IL-electrode interfaces. Here, we discover that surface-active ILs (SAILs), which contain amphiphilic structures inducing self-assembly, exhibit enhanced charge storage performance at electrified surfaces. Unlike conventional non-amphiphilic ILs, for which ion distribution is dominated by Coulombic interactions, SAILs exhibit significant and competing van der Waals interactions owing to the non-polar surfactant tails, leading to unusual interfacial ion distributions. We reveal that, at an intermediate degree of electrode polarization, SAILs display optimum performance, because the low-charge-density alkyl tails are effectively excluded from the electrode surfaces, whereas the formation of non-polar domains along the surface suppresses undesired overscreening effects. This work represents a crucial step towards understanding the unique interfacial behaviour and electrochemical properties of amphiphilic liquid systems showing long-range ordering, and offers insights into the design principles for high-energy-density electrolytes based on spontaneous self-assembly behaviour.
Editor: England: Nature Publishing Group
Idioma: Inglês

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Self-assembled nanostructures in ionic liquids facilitate charge storage at electrified interfaces

Mao, Xianwen ; Brown, Paul ; Červinka, Ctirad ; Hazell, Gavin ; Li, Hua ; Ren, Yinying ; Chen, Di ; Atkin, Rob ; Eastoe, Julian ; Grillo, Isabelle ; Padua, Agilio A H ; Costa Gomes, Margarida F ; Hatton, T Alan

England: Nature Publishing Group

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