Crowding and Anomalous Capacitance at an Electrode–Ionic Liquid Interface Observed Using Operando X-ray Scattering

Chu, Miaoqi; Miller, Mitchell; Dutta, Pulak

doi:10.1021/acscentsci.6b00014

Cited by 55 publications

(65 citation statements)

References 49 publications

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“…It means that counterions accumulate in more than one layer close to the charged surface because this charge is very high and because the bulky counter-ions cannot compensate this charge with one dense layer of pure counter-ions. Crowding was observed experimentally by an X-ray reflectivity study 47 in an ionic liquid containing bistriflimide (TFSI) starting from a surface charge density of ∼ 50µC/cm 2 which is in agreement with the simulated value for overscreening leading to a multilayer structure or crowding. Additional counter-ions different from the one of the ionic liquid are considered as they are present in our experiments (they are the initial counter-ions of the particles, localised close to the nanoparticle surface in the ionic liquid).…”

Section: Nanoscale Advances Accepted Manuscriptsupporting

confidence: 79%

Colloidal Dispersions of Oxide Nanoparticles in Ionic Liquids: Elucidating the Key Parameters

Riedl¹,

Kazemi²,

Cousin³

et al. 2019

Preprint

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Section: Nanoscale Advances Accepted Manuscriptsupporting

confidence: 79%

Colloidal Dispersions of Oxide Nanoparticles in Ionic Liquids: Elucidating the Key Parameters

Riedl¹,

Kazemi²,

Cousin³

et al. 2019

Preprint

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“…In order to better utilize ionic liquids in electrochemical energy storage and conversion systems, researchers have been trying to obtain a deeper understanding of their dynamics and interactions with solid interfaces using various techniques. For instance, one can probe out‐of‐plane ionic ordering near the liquid/solid interface using atomic force microscopy (AFM) or X‐ray reflectivity . Several low‐temperature scanning tunneling microscopy studies on in‐plane ordering have also been reported for a low coverage of ionic liquids deposited on gold and silver surfaces .…”

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confidence: 99%

In Situ Probing of Ion Ordering at an Electrified Ionic Liquid/Au Interface

et al. 2017

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Charge transport at the interface of electrodes and ionic liquids is critical for the use of the latter as electrolytes. A room-temperature ionic liquid, 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (EMMIM TFSI), is investigated in situ under applied bias voltage with a novel method using low-energy electron and photoemission electron microscopy. Changes in photoelectron yield as a function of bias applied to electrodes provide a direct measure of the dynamics of ion reconfiguration and electrostatic responses of the EMMIM TFSI. Long-range and correlated ionic reconfigurations that occur near the electrodes are found to be a function of temperature and thickness, which, in turn, relate to ionic mobility and different configurations for out-of-plane ordering near the electrode interfaces, with a critical transition in ion mobility for films thicker than three monolayers.

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“…Recent work suggests that the electrode surface is overcrowded with layers of ions causing a significant increase in the capacitance. 135 The capacitance minimum location as a function of AC frequency is shown in Figure 3.1.7c. There is a change in the capacitance minimum location from ~100 mV vs. Fc/Fc + for the 9 Hz data to ~50 mV vs. Fc/Fc + at higher frequencies.…”

Section: Role Of Watermentioning

confidence: 99%

The electrochemical double layer in ionic liquids

Lucio¹

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First of all, I have the utmost thanks for my wife, Molly, for her support and sacrifices while pursuing my degree. She has kept me sane during our time in Iowa, especially during the more demanding times in graduate school. Secondly, I owe many thanks to my advisor, Prof. Scott K. Shaw for his guidance and mentorship throughout my studies. He is the definition of a good boss and it has been a pleasure working under his supervision. With his direction I have learned a lot during my time at Iowa and he has helped me in countless research endeavors with no biology. Thirdly, I would like to thank my Shaw group co-workers and many others in the department. We literally helped build the laboratory and it's been a fun ride learning with everyone along the way. I would also like to thank my mentors and collaborators Professors Alan M. Bond and Jie Zhang from Monash University. They welcomed me in 2015 during my three-month research visit to Monash University and have helped me grow as a scientist. Furthermore, I would also like to thank my parents and brother, Gerald, Sherrie and Adam, in addition to countless mentors I met throughout my undergraduate studies who all helped encourage and support me in pursuing a PhD degree. Lastly, I wish to thank the University of Iowa, Department of Chemistry and the administrators/staff. They have always treated me with respect and provided a platform to embark on research and teaching. Included in this list are my faculty committee members who have guided me during my studies. I am very grateful for your support.

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Crowding and Anomalous Capacitance at an Electrode–Ionic Liquid Interface Observed Using Operando X-ray Scattering

Cited by 55 publications

References 49 publications

Colloidal Dispersions of Oxide Nanoparticles in Ionic Liquids: Elucidating the Key Parameters

Colloidal Dispersions of Oxide Nanoparticles in Ionic Liquids: Elucidating the Key Parameters

In Situ Probing of Ion Ordering at an Electrified Ionic Liquid/Au Interface

The electrochemical double layer in ionic liquids

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