Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage

ACS Nano, Journal Year: 2024, Volume and Issue: 18(4), P. 3707 - 3719

Published: Jan. 17, 2024

The true promise of MXene as a practical supercapacitor electrode hinges on the simultaneous advancement its three-dimensional (3D) assembly and engineering nanoscopic architecture, two critical factors for facilitating mass transport enhancing an electrode's charge-storage performance. Herein, we present straightforward strategy to engineer robust 3D freestanding (Ti3C2Tx) hydrogels with hierarchically porous structures. tetraamminezinc(II) complex cation ([Zn(NH3)4]2+) is selected electrostatically assemble colloidal nanosheets into interconnected hydrogel framework, followed by mild oxidative acid-etching process create nanoholes surface. These porous, conductive holey-MXene frameworks facilitate both electrons electrolyte ions deliver excellent specific capacitance 359.2 F g–1 at 10 mV s–1 superb retention 79% 5000 s–1, representing 42.2% 15.3% improvement over pristine hydrogel, respectively. Even commercial-standard loading 10.1 mg cm–2, it maintains impressive 52% 1000 s–1. This rational design within framework dictates significant step forward toward use other 2D materials in electrochemical energy storage systems.

Language: Английский

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Metal-organic frameworks: A comprehensive review on common approaches to enhance the energy storage capacity in supercapacitor

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 518, P. 216048 - 216048

Published: July 4, 2024

Language: Английский

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Double transition-metal MXenes: Classification, properties, machine learning, artificial intelligence, and energy storage applications

Materials Today Physics, Journal Year: 2024, Volume and Issue: 42, P. 101382 - 101382

Published: Feb. 25, 2024

Language: Английский

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Understanding Electrolyte Ion Size Effects on the Performance of Conducting Metal–Organic Framework Supercapacitors

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(18), P. 12473 - 12484

Published: April 26, 2024

Layered metal–organic frameworks (MOFs) have emerged as promising materials for next-generation supercapacitors. Understanding how and why electrolyte ion size impacts electrochemical performance is crucial developing improved MOF-based devices. To address this, we investigate the energy storage of Cu3(HHTP)2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) with a series 1 M tetraalkylammonium tetrafluoroborate (TAABF4) electrolytes different cation sizes. Three-electrode experiments show that exhibits an asymmetric charging response all sizes, higher upon positive greater asymmetry larger TAA+ cations. The results further smaller cations demonstrate superior capacitive performances both negative compared to gain insights, quartz crystal microbalance measurements were performed probe electrosorption during discharging. These reveal has cation-dominated mechanism, but interestingly indicate solvent also participates in process Overall, this study suggest saturate pores Cu3(HHTP)2-based electrodes. This leads more behavior forces molecules play role charge mechanism. findings significantly enhance our understanding layered MOFs, they will guide design

Language: Английский

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Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

Small, Journal Year: 2024, Volume and Issue: 20(33)

Published: April 3, 2024

An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy enhancing performance at high rates, achieving a balance of stored across electrodes poses significant challenge over wide range charge-discharge currents sweep rates. Consequently, fabricating hybrid asymmetric supercapacitors demands precise evaluations electrode materials development reliable methodology. This work provides an overview fundamental aspects related to charge-storage methods, aiming discern contribution each process. Subsequently, properties, including working windows, rate capability profiles, stabilities, various families are explored. It is then demonstrated, how balancing between falters broad Finally, methodology for in proposed, outlining multiple conditions dependent loaded mass current. Two step-by-step tutorials model examples applying this also provided. The proposed anticipated stimulate continued dialogue among researchers, fostering advancements stable high-performance supercapacitor devices.

Language: Английский

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Enhancing supercapacitor performance of Ni–Co–Mn metal–organic frameworks by compositing it with polyaniline and reduced graphene oxide

RSC Advances, Journal Year: 2024, Volume and Issue: 14(3), P. 2102 - 2115

Published: Jan. 1, 2024

NiCoMn metal–organic frameworks (MOFs) are one of the most sought-after materials in domain supercapacitors. Here, they composited with rGO and polyaniline to increase surface area conductivity, aiming for enhanced energy density.

Language: Английский

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Polyoxometalate/MOF-derived MoSe2/(Ni, Co)Se2 for battery-type electrodes of high-performance supercapacitors

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1000, P. 175107 - 175107

Published: June 6, 2024

Language: Английский

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Empowering supercapacitors: strategic B-site modulations of transition metal atoms in perovskite oxide based electrodes

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1003, P. 175708 - 175708

Published: July 25, 2024

Language: Английский

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Tailoring NiCoCu layered double hydroxide with Ag-citrate/polyaniline/functionalized SWCNTs nanocomposites for supercapacitor applications

RSC Advances, Journal Year: 2024, Volume and Issue: 14(20), P. 14438 - 14451

Published: Jan. 1, 2024

Supercapacitors have substantially altered the landscape of sophisticated energy storage devices with their exceptional power density along prolonged cyclic stability. On contrary, remains low, requiring research to compete conventional battery devices. This study addresses disparities between and densities in technologies by exploring integration layered double hydroxides (LDH) highly conductive materials develop an innovative system. Four electrodes were fabricated

Language: Английский

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Boosting Urea-Assisted Natural Seawater Electrolysis in 3D Leaf-Like Metal–Organic Framework Nanosheet Arrays Using Metal Node Engineering

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(22), P. 28625 - 28637

Published: May 20, 2024

Metal node engineering, which can optimize the electronic structure and modulate composition of poor electrically conductive metal–organic frameworks, is great interest for electrochemical natural seawater splitting. However, mechanism underlying influence mixed-metal nodes on electrocatalytic activities still ambiguous. Herein, a strategic design comprehensively demonstrated in mixed Ni Co metal redox-active centers are uniformly distributed within NH2–Fe-MIL-101 to obtain synergistic effect overall enhancement activities. Three-dimensional metallic MOF nanosheet arrays, consisting three different nodes, were situ grown foam as highly active stable bifunctional catalyst urea-assisted A well-defined NH2–NiCoFe-MIL-101 reaches 1.5 cm–2 at 360 mV oxygen evolution reaction (OER) 0.6 295 hydrogen (HER) freshwater, substantially higher than its bimetallic monometallic counterparts. Moreover, electrode exhibits eminent catalytic activity stability seawater-based electrolytes. Impressively, two-electrode alkaline electrolysis cell based needs only 1.56 yield 100 mA cm–2, much lower 1.78 V cells superior long-term current density 80 h.

Language: Английский

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