Identification of Droplet-Flow-Induced Electric Energy on Electrolyte–Insulator–Semiconductor Structure

Park, Jun‐Woo; Song, Suhwan; Yang, Young‐Min; Kwon, Soon Hyung; Sim, Eunji; Kim, Youn Sang

doi:10.1021/jacs.7b05030

Cited by 70 publications

(95 citation statements)

References 31 publications

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“…[297][298][299] Furthermore, the conductive channel can be coated with some hydrophobic and dielectric materials and need not be in contact with the droplet. [300][301][302][303] Since the generated voltage is determined by the adsorbed ion species, rational design of coating layers may enable specific detection of certain charged molecules in the solution. As a prototype, Kim and colleagues demonstrated a pH sensor by incorporating amino groups into their hydrophobic coating layer.…”

Section: The Capacitive Discharge Mechanismmentioning

confidence: 99%

Direct Electricity Generation Mediated by Molecular Interactions with Low Dimensional Carbon Materials—A Mechanistic Perspective

Liu

Zhang

Cottrill

et al. 2018

Advanced Energy Materials

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Next generation off-the-grid electronic systems call for alternative modes of energy harvesting. The past two decades have witnessed the evolution of a wide spectrum of low dimensional carbon materials with extraordinary physical and chemical properties, ideal for micro-scale electrical energy storage and generation. Tremendous progress has been made in harnessing the energy associated with the interactions between these nano-structured carbon substrates and the surrounding molecular phases, subsequently converting them into useful electricity. This review summarizes the important theoretical and experimental milestones the field has reached to date, and further classifies these energy harvesting processes based on underlying physics, into five mechanistically distinct classesphonon coupling, Coulombic scattering, electrokinetic streaming, asymmetric doping, and capacitive discharging. With a special mechanistic focus, the authors hope to resolve the fundamental attributes shared by this diverse array of molecular scale energy harvesting schemes, offer perspectives on key challenges, and ultimately establish design principles that guide further device optimization.

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Section: The Capacitive Discharge Mechanismmentioning

confidence: 99%

Direct Electricity Generation Mediated by Molecular Interactions with Low Dimensional Carbon Materials—A Mechanistic Perspective

Liu

Zhang

Cottrill

et al. 2018

Advanced Energy Materials

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“…[11,15,16] As a discerning method of solid/liquid interfacial states, an ionovoltaic generation, converting the interfacial potential effects on the electrolyte/dielectric (SAM and insulating layer)/electrode interface to electric signals, has been proposed, and correlative studies were conducted for investigating its mechanism. [17][18][19][20][21] The interfacial potential gradient, emanating from the intrinsic molecular dipole of SAM, was revealed to an origin of electric signals, and through this, such a system was demonstrated to sensitively probe the interfacial potential alteration by chemical interactions within the electrolytes/SAM interface (e.g., de-/protonation and ion complexation). [9,22] Hence, along with varying the SAM design, specific ion-molecular interactions at the liquid/ SAM interface could be interrogated through an intuitive observation of electrical output changes on the ionovoltaic system.…”

Section: Introductionmentioning

confidence: 99%

Probing an Interfacial Ionic Pairing‐Induced Molecular Dipole Effect in Ionovoltaic System

et al. 2021

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A surficial molecular dipole effect depending on ion‐molecular interactions has been crucial issues regarding to an interfacial potential, which can modulate solid electronic and electrochemical systems. Their properties near the interfacial region can be dictated by specific interactions between surface and adsorbates, but understandings of the corresponding details remain at interesting issues. Here, intuitive observations of an ionic pair formation‐induced interfacial potential shifts are presented with an ionovoltaic system, and corresponding output signal variations are analyzed in terms of the surficial dipole changes on self‐assembled monolayer. With aiding of photoelectron spectroscopies and density function theory simulation, the ionic pair formation‐induced potential shifts are revealed to strongly rely on a paired molecular structure and a binding affinity of the paired ionic moieties. Chemical contributions to the binding event are interrogated in terms of polarizability in each ionic group and consistent with chaotropic/kosmotropic character of the ionic groups. Based on these findings, the ionovoltaic output changes are theoretically correlated with an adsorption isotherm reflecting the molecular dipole effect, thereby demonstrating as an efficient interfacial molecular probing method under electrolyte interfacing conditions.

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“…Recently, several studies carried out by various groups, including our own, reported on a water‐motion‐induced energy conversion device based on solid–liquid interfacial phenomena . In addition, an ionion‐dynamics‐induced electricity generation (called an ionovoltaic device) was proposed as a working mechanism . In these studies, it was revealed that the electrical properties at the EDL can influence the device performance.…”

mentioning

confidence: 99%

“…Influential factors for the output voltage in our device are the contact‐areal variation rate between the droplet and the bottom plate

(\frac{normald A false(t false)}{normald t})

, resistor–capacitor (RC) discharging, and the interfacial potential difference between the electrolyte (droplet) and the ITO electrode . Among them, the effect of the interfacial potential difference can outplay the influence of

\frac{d A (t)}{d t}

and the RC discharging.…”

mentioning

confidence: 99%

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A Surface‐Functionalized Ionovoltaic Device for Probing Ion‐Specific Adsorption at the Solid–Liquid Interface

et al. 2018

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Aqueous ion–solid interfacial interactions at an electric double layer (EDL) are studied in various research fields. However, details of the interactions at the EDL are still not fully understood due to complexity induced from the specific conditions of the solid and liquid parts. Several technical tools for ion–solid interfacial probing are experimentally and practically proposed, but they still show limitations in applicability due to the complicated measurements. Recently, an energy conversion device based on ion dynamics (called ionovoltaic device) was also introduced as another monitoring tool for the EDL, showing applicability as a novel probing method for interfacial interactions. Herein, a monitoring technique for specific ion adsorption (Cu2+ and Pb2+ in the range of 5 × 10−6–1000 × 10−6m) in the solid–liquid interface based on the ionovoltaic device is newly demonstrated. The specific ion adsorption and the corresponding interfacial potentials profiles are also investigated to elucidate a working mechanism of the device. The results give the insight of molecular‐level ion adsorption through macroscopic water‐motion‐induced electricity generation. The simple and cost‐effective detection of the device provides an innovative route for monitoring specific adsorption and expandability as a monitoring tool for various solid–liquid interfacial phenomena that are unrevealed.

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Identification of Droplet-Flow-Induced Electric Energy on Electrolyte–Insulator–Semiconductor Structure

Cited by 70 publications

References 31 publications

Direct Electricity Generation Mediated by Molecular Interactions with Low Dimensional Carbon Materials—A Mechanistic Perspective

Direct Electricity Generation Mediated by Molecular Interactions with Low Dimensional Carbon Materials—A Mechanistic Perspective

Probing an Interfacial Ionic Pairing‐Induced Molecular Dipole Effect in Ionovoltaic System

A Surface‐Functionalized Ionovoltaic Device for Probing Ion‐Specific Adsorption at the Solid–Liquid Interface

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