Spindle‐Shaped Ni‐Fe‐Layered Double Hydroxide: Effect of Etching Time on Flexible Energy Storage

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Abstract The rising demand for efficient energy storage in flexible electronics is driving the search materials that are well‐suited fabrication of these devices. Layered Double Hydroxides (LDHs) stand out as a remarkable material with layered structure embodies exceptional electrochemical properties. In this study, both double‐shelled and single‐shelled NiFe‐Layered Hydroxide (LDH) particles prepared using spindle‐shaped MIL‐101(Fe) template. These NiFe‐LDH then utilized to develop device. Transmission electron microscopy(TEM) analysis revealed as‐synthesized transformed into hollow single‐shells from aging time increased, which significantly influenced performances. Despite decreasing specific capacitance density longer etching times, sample etched 2 h (NiFe‐LDH 2h) demonstrated highest 9.24 mF·cm⁻ an 0.46 µW·h·cm⁻ , highlighting its promising performance applications. X‐ray photoelectron spectroscopy (XPS) Ni 2+ : 3+ ratio, Fe: ratio NiFe‐ LDH 2h samples, further influences ability maintain high across different bending angles emphasizes versatility relevance emerging markets.

Language: Английский

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Biomolecules-Derived Nitrogen-Doped Turbostratic Graphene Nanoscaffold Decorated with Cobalt Single Atoms for Enhanced Oxygen Evolution Reaction

Energy & Fuels, Journal Year: 2025, Volume and Issue: 39(6), P. 3226 - 3242

Published: Jan. 31, 2025

The development of carbon-based first-row transition metal single-atom catalysts (SACs) for the electrochemical oxygen evolution reaction (OER) has recently gained tremendous attention. However, synthesis SACs mainly relies on tailored precursors and, therefore, requires extensive and time-consuming chemical reactions. Herein, we report a simple process synthesizing mesoporous cobalt SAC (CoN4@C-SAC) by pyrolysis readily available biomolecules without any template or acid–base treatments. Raman spectroscopy confirms minor structural defects in CoN4@C-SAC, exemplified an ID/IG value as low 0.13. Synchrotron X-ray total scattering analysis based atomic pair distribution function reveals turbostratic graphene-like structure predominantly containing sp2 carbons with enlarged interlayer spacing 3.58 Å. photoelectron aberration-corrected scanning transmission electron microscopy confirm uniform dispersion Co–N4-type species graphene surfaces. With its unique nanostructure high utilization efficiency Co sites, CoN4@C-SAC exhibits fairly good OER activity 1 M KOH, demonstrated overpotential 339 mV at 10 mA/cm2 Tafel slope 54 mV/dec, mass turnover frequency 6726 mA/mg-Co 1.06 s–1 1.65 V, respectively. Impedance analyses clarify that facilitates enhanced kinetics lower charge transfer resistances. catalyst manifests long-term stability practical applications, revealed steady performance over 3000 redox cycles 65 h chronopotentiometry measurement.

Language: Английский

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Development of Electrochemical Water Splitting with Highly Active Nanostructured NiFe Layered Double Hydroxide Catalysts: A Comprehensive Review

Catalysts, Journal Year: 2025, Volume and Issue: 15(3), P. 293 - 293

Published: March 20, 2025

Electrochemical water splitting is a feasible and effective method for attaining hydrogen, offering mechanism renewable energy solutions to combat the world’s crises due scarcity of fossil fuels. Evidently, viability stability electrocatalysts are fundamental electrochemical water-splitting process. However, net efficiency this process noticeably hindered by kinetic drawbacks related OER. Hence, NiFe LDH has been widely used as highly efficient OER HER catalyst material its unique nanostructure, tunable composition, favorable electronic structure. This review offers systematic analysis latest progress in fabrication functional catalysts associated strategies, structure optimizations, performance improvements. Special emphasis given understanding role nanostructure engineering increasing active site accessibility, enhancing effectiveness subsequent electron transfer, boosting intrinsic catalytic activity Moreover, we discuss influence doping, defects, formation heterostructures with other materials on activities LDHs. Additional accounts basic structures provided, along an enhanced theoretical based DFT studies LDH. limitations potential developments work focus need existing synthesis approaches, catalysts, their insertion into working processes. comprehensive current state research use foster improved development sustainable hydrogen sources future.

Language: Английский

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In-situ fast reduction approach for the creation of α-Ni(OH)2 for effective water splitting, and urea oxidation

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 128, P. 488 - 498

Published: April 18, 2025

Language: Английский

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Chemical vapor-deposited nanocarbon/Fe/Al2O3 composite catalysts for oxygen evolution

Materials Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown, P. 130485 - 130485

Published: Feb. 1, 2025

Language: Английский

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Enhancement of Oxygen Evolution Performance of water splitting at High Current Density by Novel Electrodeposited NiFe-LDH Coatings

Electrochimica Acta, Journal Year: 2025, Volume and Issue: unknown, P. 146332 - 146332

Published: April 1, 2025

Language: Английский

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Nitrogen-Doped Activated Carbon from Sweet Potato for Electrochemical Detection of Bisphenol A in Water and Soil Samples

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 142555 - 142555

Published: May 1, 2025

Language: Английский

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