Pseudocapacitance: From Fundamental Understanding to High Power Energy Storage Materials

Chemical Reviews, Journal Year: 2020, Volume and Issue: 120(14), P. 6738 - 6782

Published: June 28, 2020

There is an urgent global need for electrochemical energy storage that includes materials can provide simultaneous high power and density. One strategy to achieve this goal with pseudocapacitive take advantage of reversible surface or near-surface Faradaic reactions store charge. This allows them surpass the capacity limitations electrical double-layer capacitors mass transfer batteries. The past decade has seen tremendous growth in understanding pseudocapacitance as well exhibit phenomenon. purpose Review examine fundamental development concept how it came prominence describe new classes whose behavior be described pseudocapacitive.

Language: Английский

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Contact Electrification at the Liquid–Solid Interface

Chemical Reviews, Journal Year: 2021, Volume and Issue: 122(5), P. 5209 - 5232

Published: June 23, 2021

Interfaces between a liquid and solid (L-S) are the most important surface science in chemistry, catalysis, energy, even biology. Formation of an electric double layer (EDL) at L-S interface has been attributed due to adsorption ions surface, which causes redistribute. Although existence charges on is always assumed, origin not extensively explored. Recent studies contact electrification (CE) suggest that electron transfer plays dominant role initial stage for forming charge interface. Here, we review recent works about liquid-solid CE, including scenerios such as liquid-insulator, liquid-semiconductor, liquid-metal. EDL revisited considering Furthermore, triboelectric nanogenerator (TENG) technique based CE introduced, can be used only harvesting mechanical energy from but also probe probing interfaces.

Language: Английский

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Solar-Powered Sustainable Water Production: State-of-the-Art Technologies for Sunlight–Energy–Water Nexus

ACS Nano, Journal Year: 2021, Volume and Issue: 15(8), P. 12535 - 12566

Published: July 19, 2021

Alternative water resources (seawater, brackish water, atmospheric sewage, etc.) can be converted into clean freshwater via high-efficiency, energy-saving, and cost-effective methods to cope with the global crisis. Herein, we provide a comprehensive systematic overview of various solar-powered technologies for alternative utilization (i.e., "sunlight-energy-water nexus"), including solar-thermal interface desalination (STID), membrane (STMD), solar-driven electrochemical (SED), harvesting (ST-AWH). Three strategies have been proposed improving evaporation rate STID systems above theoretical limit designing all-weather or all-day operating by analyzing energy transfer condensation processes caused conversion. This review also introduces fundamental principles current research hotspots two other seawater (STMD SED) in detail. In addition, cover ST-AWH terms technology design, materials evolution, device assembly, etc. Finally, summarize content this discuss challenges future outlook different types technologies.

Language: Английский

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Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(16), P. 13547 - 13635

Published: July 29, 2022

Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated decreasing ability traditional treatment methods to comply with tightening standards. This review provides a comprehensive description principles applications electrochemical for water purification, ion separations, energy conversion. Electrochemical attractive features such as compact size, chemical selectivity, broad applicability, reduced generation secondary waste. Perhaps greatest advantage methods, however, that they remove contaminants directly from water, while other technologies extract contaminants, which enables efficient removal trace pollutants. The begins an overview conventional drive or physical transformations via Faradaic reactions at electrodes, proceeds detailed examination two primary mechanisms are separated in nondestructive processes, namely electrokinetics electrosorption. In these sections, special attention given emerging shock electrodialysis Given importance generating clean, renewable energy, may sometimes be combined also discusses inverse conversion based on reverse electrosorption, electrowetting, electrokinetic phenomena. concludes discussion technology comparisons, remaining challenges, potential innovations field process intensification technoeconomic optimization.

Language: Английский

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Continuous transition from double-layer to Faradaic charge storage in confined electrolytes

Nature Energy, Journal Year: 2022, Volume and Issue: 7(3), P. 222 - 228

Published: March 17, 2022

Language: Английский

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Two‐Dimensional MXene‐Polymer Heterostructure with Ordered In‐Plane Mesochannels for High‐Performance Capacitive Deionization

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(51), P. 26528 - 26534

Published: Nov. 8, 2021

The application of traditional electrode materials for high-performance capacitive deionization (CDI) has been persistently limited by their low charge-storage capacities, excessive co-ion expulsion and slow salt removal rates. Here we report a bottom-up approach to the preparation two-dimensional (2D) Ti3 C2 Tx MXene-polydopamine heterostructure having ordered in-plane mesochannels (denoted as mPDA/MXene). Interfacial self-assembly mesoporous polydopamine (mPDA) monolayers on MXene nanosheets leads mPDA/MXene heterostructure, which exhibits several unique features: (1) undergoes reversible ion intercalation/deintercalation possesses high conductivity; (2) mPDA layers establish redox characteristics Na+ selectivity, also help prevent self-stacking oxidation MXene; (3) enable smooth transport ions at internal spaces this stacked 2D material. When applied an material CDI, exhibit top-level CDI performance cycling stability compared those so far reported materials. Our study opens avenue rational construction MXene-organic hybrid heterostructures, further motivates development

Language: Английский

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Electron Transfer as a Liquid Droplet Contacting a Polymer Surface

ACS Nano, Journal Year: 2020, Volume and Issue: 14(12), P. 17565 - 17573

Published: Nov. 24, 2020

It has been demonstrated that substantial electric power can be produced by a liquid-based triboelectric nanogenerator (TENG). However, the mechanisms regarding electrification between liquid and solid surface remain to extensively investigated. Here, working mechanism of droplet-TENG was proposed based on study its dynamic saturation process. Moreover, charge-transfer at liquid-solid interface verified as hybrid effects electron transfer ion adsorption simple but valid method. Thus, we model for charge distribution interface, named Wang's layer, which involves transfer, ionization reaction, van der Waals force. Our work not only proves TENG is probe investigating all phases, such solid-solid liquid-solid, also may have great significance water energy harvesting revolutionize traditional understanding used in many fields electrochemistry, catalysis, colloidal science, even cell biology.

Language: Английский

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Flow Electrode Capacitive Deionization (FCDI): Recent Developments, Environmental Applications, and Future Perspectives

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(8), P. 4243 - 4267

Published: March 16, 2021

With the increasing severity of global water scarcity, a myriad scientific activities is directed toward advancing brackish desalination and wastewater remediation technologies. Flow-electrode capacitive deionization (FCDI), newly developed electrochemically driven ion removal approach combining ion-exchange membranes flowable particle electrodes, has been actively explored over past seven years, by possibility energy-efficient, sustainable, fully continuous production high-quality fresh water, as well flexible management electrodes concentrate stream. Here, we provide comprehensive overview current advances this interesting technology with particular attention given to FCDI principles, designs (including cell architecture electrode separator options), operational modes approaches electrodes), characterizations modeling, environmental applications desalination, resource recovery, contaminant abatement). Furthermore, introduce definitions performance metrics that should be used so fair assessments comparisons can made between different systems separation conditions. We then highlight most pressing challenges (i.e., operation capital cost, scale-up, commercialization) in full-scale application technology. conclude state-of-the-art review considering overall outlook discussing areas requiring future.

Language: Английский

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Capacitive Removal of Heavy Metal Ions from Wastewater via an Electro-Adsorption and Electro-Reaction Coupling Process

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(5), P. 3333 - 3340

Published: Feb. 19, 2021

Heavy metals widely exist in wastewater, which is a serious threat to human health or water environment. Highly efficient removal of heavy metal ions from wastewater major challenge treatment. In this work, capacitive via an electro-adsorption and electro-reaction coupling process was originally demonstrated. The efficiency the binary-component solutions containing nitrate (10 mg/L) NaCl (100 can reach 99%. Even be close 99% multi-component solution all seven nitrates mg/L for each) 100 NaCl. Meanwhile, maintained excellent regeneration ability even after 20 cycles. Furthermore, mechanism proven pseudocapacitive intercalation into layered structure employed W18O49/graphene process. This work demonstrates great potential general applicability

Language: Английский

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Faradaic Electrodes Open a New Era for Capacitive Deionization

Advanced Science, Journal Year: 2020, Volume and Issue: 7(22)

Published: Oct. 11, 2020

Abstract Capacitive deionization (CDI) is an emerging desalination technology for effective removal of ionic species from aqueous solutions. Compared to conventional CDI, which based on carbon electrodes and struggles with high salinity streams due a limited salt capacity by ion electrosorption excessive co‐ion expulsion, the Faradaic provide unique opportunities upgrade CDI performance, i.e., achieving much higher capacities energy‐efficient streams, reaction capture. This article presents comprehensive overview current developments electrode materials CDI. Here, fundamentals electrode‐based are first introduced in detail, including novel cell architectures, key performance metrics, capture mechanisms, design principles materials. Three main categories summarized discussed regarding their crystal structure, physicochemical characteristics, performance. In particular, mechanisms highlighted obtain better understanding process. Moreover, tailored applications, selective contaminant removal, specifically introduced. Finally, remaining challenges research directions also outlined guidelines future research.

Language: Английский

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