Current Progress in 2D Metal–Organic Frameworks for Electrocatalysis

Small Structures, Год журнала: 2022, Номер 4(6)

Опубликована: Сен. 16, 2022

The 2D nanosheets of metal–organic frameworks (MOFs) have recently emerged as a promising material that makes them valuable in widespread electrocatalytic fields due to their atomic‐level thickness, abundant active sites, and large surface area. Efficient electrocatalysts for hydrogen evolution reaction (HER), oxygen (OER), overall water splitting are highly desired with low overpotentials promote the industrial applications energy conversion devices. MOF nanostructures provide long‐term stability high electrical conductivity enhance catalyst activity durability. This review briefly summarizes synthesis HER/OER/water splitting. More attention is focused on synthetic strategies derivatives. catalytic performance superior properties these materials highlighted. outperformance originates from rational design, myriad thickness. current future challenges this field scientific perspectives overcome It suggested construction can develop state‐of‐the‐art electrocatalyst environmental division.

Язык: Английский

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Fluids and Electrolytes under Confinement in Single-Digit Nanopores

Chemical Reviews, Год журнала: 2023, Номер 123(6), С. 2737 - 2831

Опубликована: Март 10, 2023

Confined fluids and electrolyte solutions in nanopores exhibit rich surprising physics chemistry that impact the mass transport energy efficiency many important natural systems industrial applications. Existing theories often fail to predict exotic effects observed narrowest of such pores, called single-digit (SDNs), which have diameters or conduit widths less than 10 nm, only recently become accessible for experimental measurements. What SDNs reveal has been surprising, including a rapidly increasing number examples as extraordinarily fast water transport, distorted fluid-phase boundaries, strong ion-correlation quantum effects, dielectric anomalies are not larger pores. Exploiting these presents myriad opportunities both basic applied research stand host new technologies at water-energy nexus, from membranes precise separations purification gas permeable materials electrolyzers energy-storage devices. also present unique achieve ultrasensitive selective chemical sensing single-ion single-molecule limit. In this review article, we summarize progress on nanofluidics SDNs, with focus confinement arise extremely narrow nanopores. The recent development precision model systems, transformative tools, multiscale played enabling roles advancing frontier reviewed. We identify knowledge gaps our understanding nanofluidic provide an outlook future challenges frontier.

Язык: Английский

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Bioinspired Ti₃C₂T_xMXene‐Based Ionic Diode Membrane for High‐Efficient Osmotic Energy Conversion

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(41)

Опубликована: Июнь 30, 2022

Abstract Bioinspired asymmetric nanofluidic ion channels with ionic diode behavior that can boost the osmotic energy (so‐called blue energy) conversion are highly desirable, especially if they be easily constructed and modified. Two‐dimensional (2D) metal carbides nitrides, known as MXenes, combine hydrophilic surfaces tunable surface charge properties, providing a shortcut to prepare channels. Here, we report mechanically robust, flexible, scale‐up‐friendly Ti 3 C 2 T x MXene‐based membrane rectified current demonstrate its potential use in reverse electrodialysis conversion. Under salinity gradient of synthetic seawater river water, our membrane‐based generator‘s power density is 8.6 W m −2 up 17.8 at 500‐fold gradient, outperforming state‐of‐the‐art membranes. The design diode‐type provides facile general strategy developing large‐scale 2D nanofluidics selective transport.

Язык: Английский

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Maximizing Ion Permselectivity in MXene/MOF Nanofluidic Membranes for High‐Efficient Blue Energy Generation

Advanced Functional Materials, Год журнала: 2022, Номер 32(49)

Опубликована: Окт. 11, 2022

Abstract Both ion permeability and selectivity of membranes are crucial for nanofluidic behavior. However, it remains a long‐standing challenge 2D materials to balance these two factors osmotic energy harvesting. Herein, the MXene/metal–organic framework (MOF) hybrid reported realize efficient ion‐permselective system, leading high‐performance power generator. In zeolitic imidazolate framework‐8 (ZIF‐8) is deposited onto MXene surface intercalated between nanosheets by electropolymerization approach. The angstrom‐sized windows ZIF‐8 layer act as filters, endowing membrane with high cation size effect. intercalation crystals, reduces interspacing MXene, therefore, not only enhancing shortening transport pathway through membrane, but also further improving increasing overlap effect electric‐double layer. maximum density reaches up 48.05 W m −2 under 500‐fold salinity gradient (1263.3 A ), 0.906 at 50‐fold obtained. This study provides facile method fabricate both water nexus conversion.

Язык: Английский

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Bioinspired design of Na-ion conduction channels in covalent organic frameworks for quasi-solid-state sodium batteries

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 27, 2023

Solid polymer electrolytes are considered among the most promising candidates for developing practical solid-state sodium batteries. However, moderate ionic conductivity and narrow electrochemical windows hinder their further application. Herein, inspired by Na+/K+ conduction in biological membranes, we report a (-COO-)-modified covalent organic framework (COF) as Na-ion quasi-solid-state electrolyte with sub-nanometre-sized Na+ transport zones (6.7-11.6 Å) created adjacent -COO- groups COF inwalls. The enables selective along specific areas that electronegative sub-nanometre dimensions, resulting of 1.30×10-4 S cm-1 oxidative stability up to 5.32 V (versus Na+/Na) at 25 ± 1 °C. Testing Na||Na3V2(PO4)3 coin cell configuration demonstrates fast reaction dynamics, low polarization voltages, stable cycling performance over 1000 cycles 60 mA g-1 °C 0.0048% capacity decay per cycle final discharge 83.5 mAh g-1.

Язык: Английский

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Optimizing Membranes for Osmotic Power Generation

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(26)

Опубликована: Апрель 3, 2023

The design of ion-selective membranes is the key towards efficient reverse electrodialysis-based osmotic power conversion. tradeoff between ion selectivity (output voltage) and permeability current) in existing porous membranes, however, limits upgradation generation efficiency for practical applications. Thus, we provide simple guidelines based on fundamentals transport nanofluidics promoting In addition, discuss strategies optimizing membrane performance through analysis various material parameters design, such as pore size, surface charge, density, thickness, pathway, order, ionic diode effect. Lastly, a perspective future directions to further maximize conversion outlined.

Язык: Английский

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Sustainable catalytic oxidation of glycerol: a review

Environmental Chemistry Letters, Год журнала: 2023, Номер 21(5), С. 2825 - 2861

Опубликована: Июнь 4, 2023

Язык: Английский

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Design of Photothermal “Ion Pumps” for Achieving Energy-Efficient, Augmented, and Durable Lithium Extraction from Seawater

ACS Nano, Год журнала: 2024, Номер 18(3), С. 2434 - 2445

Опубликована: Янв. 11, 2024

Extracting lithium from seawater has emerged as a disruptive platform to resolve the issue of an ever-growing shortage. However, achieving highly efficient and durable extraction in energy-efficient manner is challenging, imposed by low concentration ions (Li+) high interfering seawater. Here, we report facile universal strategy develop photothermal "ion pumps" (PIPs) that allow energy-efficient, augmented, under sunlight. The key design PIPs lies function fusion spatial configuration manipulation hydrophilic Li+-trapping nanofibrous core hydrophobic shell for governing gravity-driven water flow solar-driven evaporation. Such synergetic effect allows achieve spontaneous, continuous, augmented Li+ replenishment–diffusion–enrichment, well circumvent impact polarization scaling ions. We demonstrate our exhibit dramatic enhancement trapping rate outstanding separation factor yet have ultralow energy consumption. Moreover, deliver ultrastable performance without even high-concentration 140 h operation, opposed significant decrease nearly 55.6% conventional configuration. concept material toolkit developed this work can also find applications extracting high-value-added resources beyond.

Язык: Английский

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Switchable Na+ and K+ selectivity in an amino acid functionalized 2D covalent organic framework membrane

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Дек. 22, 2022

Abstract Biological cell membranes can efficiently switch Na + /K selectivity in response to external stimuli, but achieving analogous functions a single artificial membrane is challenging. Here, we report highly crystalline covalent organic framework (COF) with well-defined nanochannels and coordinative sites (i. e., amino acid) that act as ion-selective switches manipulate K transport. The ion of the COF dynamic be switched between -selective by applying pH stimulus. experimental results combined molecular dynamics simulations reveal switchable originates from differentiated coordination interactions ions acids. Benefiting selectivity, further demonstrate potential varying electrolyte pH, miming polarity reversal during neural signal transduction vivo, suggesting great these for vitro biomimetic applications.

Язык: Английский

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Meta‐Aerogel Ion Motor for Nanofluid Osmotic Energy Harvesting

Advanced Materials, Год журнала: 2023, Номер 35(38)

Опубликована: Июнь 9, 2023

Abstract Osmotic power, also known as “blue energy”, is a vast, sustainable, and clean energy source that can be directly converted into electricity by nanofluidic membranes. However, the key technological bottleneck for large‐scale osmotic macroscopic‐scale bulky membrane cannot synergistically satisfy demands of high power density low resistance without sacrificing scalability mechanical robustness. Here, inspired anatomy working principle electric eels, which harness through embedded neuron‐mediated fibril nanochannels with nanoconfined transport dynamics. Fibrous meta‐aerogel ion motors, 3D‐assembled from cable fibers actuatable stimulation/transport “ion highways” are engineered. The exhibits integrated coupling effect boosted propulsion surface‐charge‐dominated selective transport. Driven osmosis, motor produce an unprecedented output up to 30.7 W m −2 under 50‐fold salinity gradient. Advancing ultra‐selective in meta‐aerogels may provide promising roadmap blue harvesting.

Язык: Английский

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