ZrW2O8超级电容器电化学性能的放大：在Na2SO4电解质中通过K3Fe(CN)6氧化还原添加剂从EDLC向电池型行为的转变

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-10-04 DOI:10.1016/j.mseb.2025.118843

Sajan Thomas , Ann V. Lizbathu , Neekha Deen Abraham , Jifi Jose , Bibily Baby , P.R. Biju , Ditty Dixon , Cyriac Joseph

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引用次数: 0

摘要

研究了氧化还原添加剂（0.5 M K3Fe(CN)6 in 1 M Na2SO4）对水热法制备ZrW2O8 （ZT）超级电容器电极电化学性能的影响。在三电极结构下的电化学测量表明，与单独使用Na2SO4相比，使用Na2SO4/K3Fe(CN)6电解质可以显著提高比电容。这种改善归因于离子电导率的增加和可逆的[Fe(CN)6]3−/[Fe(CN)6]4−氧化还原对的协同作用。循环伏安（CV）和恒流充放电（GCD）曲线的演变证实了在引入氧化还原添加剂后，电荷存储机制从双电层电容（EDLC）转变为电池型行为。此外，在Na2SO4/K3Fe(CN)6电解液中工作的ZT//AC非对称超级电容器在0-1.5 V电位窗口内，在1 a /g下提供了364 F/g的高比电容，以及令人印象印象的113.75 Wh/kg的能量密度。这些发现强调了一种简单有效的策略，通过加入氧化还原添加剂来显着提高zt基超级电容器的储能能力。

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Amplification of electrochemical performance in ZrW2O8 supercapacitor: Transition from EDLC to battery-type behaviour via K3Fe(CN)6 redox additive in Na2SO4 electrolyte

This study investigates the influence of a redox additive (0.5 M K₃Fe(CN)₆ in 1 M Na₂SO₄) on the electrochemical performance of ZrW₂O₈ (ZT) supercapacitor electrodes synthesised via a hydrothermal route. Electrochemical measurements in a three-electrode configuration revealed a substantial enhancement in specific capacitance with the Na₂SO₄/K₃Fe(CN)₆ electrolyte compared to Na₂SO₄ alone. This improvement is attributed to the synergistic effects of increased ionic conductivity and the reversible [Fe(CN)₆]³⁻/[Fe(CN)₆]⁴⁻ redox couple. The evolution of cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) profiles confirmed a transition in the charge storage mechanism from electric double-layer capacitance (EDLC) to battery-type behaviour upon the introduction of the redox additive. Furthermore, the ZT//AC asymmetric supercapacitor operating in the Na₂SO₄/K₃Fe(CN)₆ electrolyte delivered a high specific capacitance of 364 F/g at 1 A/g within a 0–1.5 V potential window, along with an impressive energy density of 113.75 Wh/kg. These findings highlight a simple and effective strategy to significantly enhance the energy storage capability of ZT-based supercapacitors through the incorporation of redox additives.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.