What does this research mean for the field?

The mixed Fe2+/Fe3+ valence states in ZnFe2O4 enhance Fe-O hybridization and charge transport, resulting in superior supercapacitor performance and high energy density in neutral Na2SO4 electrolyte compared to alkaline KOH. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To correlate the mixed-valence iron electronic structure with electrolyte-dependent charge storage in ZnFe2O4 and assess its performance in symmetric supercapacitors.

August 27, 2026Energy Storage

Electrolyte‐Dependent Charge Storage in ZnFe 2 O 4 : Insights Into Fe Mixed‐Valence Electronic Structure via Near‐Edge X‐Ray Absorption Fine Structure ( NEXAFS ) and Symmetric Supercapacitor Performance

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Authors

AAAdil AlshoaibiKing Faisal University MNManas NasitUniversity of Petroleum and Energy Studies NSNagih M. ShaalanKing Faisal University

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Implication

Materials characterization study reveals superior capacitive performance of mixed-valence zinc ferrite in neutral electrolyte, highlighting its viability for high-performance supercapacitors.

Key Points

To correlate the mixed-valence iron electronic structure with electrolyte-dependent charge storage in ZnFe2O4 and assess its performance in symmetric supercapacitors.
Synthesized ZnFe2O4 via co-precipitation and probed its electronic structure using near-edge X-ray absorption fine structure (NEXAFS) at the Fe L3,2- and O K-edges.
Evaluated three-electrode electrochemical performance in 1.0 M KOH and 1.0 M Na2SO4 electrolytes using cyclic voltammetry, galvanostatic charge–discharge, and impedance spectroscopy.
Fabricated a ZnFe2O4 symmetric supercapacitor device and tested its capacitance, energy density, power density, and cyclic stability over 10,000 cycles.
NEXAFS linear combination fitting revealed a partially inverse spinel structure with ~74.4% Fe3+ and ~25.6% Fe2+, enhancing Fe–O hybridization for charge transport.
In 1.0 M Na2SO4, the ZnFe2O4 electrode delivered a specific capacitance of 692.2 F/g at 1 A/g, an energy density of 96.13 Wh/kg, and ~91% capacitance retention after 2,000 cycles.
The symmetric supercapacitor achieved a specific capacitance of 201.28 F/g at 0.25 A/g, an energy density of 71.57 Wh/kg at 400 W/kg, and 46.93% retention after 10,000 cycles at 2.5 A/g.

Cite This Study

Alshoaibi et al. (2026) studied this question.

synapsesocial.com/papers/6a8fea0110c91c1e92621ff9 https://doi.org/10.1002/est2.70501

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August 27, 2026Energy Storage

Electrolyte‐Dependent Charge Storage in ZnFe 2 O 4 : Insights Into Fe Mixed‐Valence Electronic Structure via Near‐Edge X‐Ray Absorption Fine Structure ( NEXAFS ) and Symmetric Supercapacitor Performance

View Full Paper

Ask AI

Bookmark

Authors

AAAdil AlshoaibiKing Faisal University MNManas NasitUniversity of Petroleum and Energy Studies NSNagih M. ShaalanKing Faisal University

Discussion

Member takes

Implication

Materials characterization study reveals superior capacitive performance of mixed-valence zinc ferrite in neutral electrolyte, highlighting its viability for high-performance supercapacitors.

Key Points

To correlate the mixed-valence iron electronic structure with electrolyte-dependent charge storage in ZnFe2O4 and assess its performance in symmetric supercapacitors.
Synthesized ZnFe2O4 via co-precipitation and probed its electronic structure using near-edge X-ray absorption fine structure (NEXAFS) at the Fe L3,2- and O K-edges.
Evaluated three-electrode electrochemical performance in 1.0 M KOH and 1.0 M Na2SO4 electrolytes using cyclic voltammetry, galvanostatic charge–discharge, and impedance spectroscopy.
Fabricated a ZnFe2O4 symmetric supercapacitor device and tested its capacitance, energy density, power density, and cyclic stability over 10,000 cycles.
NEXAFS linear combination fitting revealed a partially inverse spinel structure with ~74.4% Fe3+ and ~25.6% Fe2+, enhancing Fe–O hybridization for charge transport.
In 1.0 M Na2SO4, the ZnFe2O4 electrode delivered a specific capacitance of 692.2 F/g at 1 A/g, an energy density of 96.13 Wh/kg, and ~91% capacitance retention after 2,000 cycles.
The symmetric supercapacitor achieved a specific capacitance of 201.28 F/g at 0.25 A/g, an energy density of 71.57 Wh/kg at 400 W/kg, and 46.93% retention after 10,000 cycles at 2.5 A/g.

Cite This Study

Alshoaibi et al. (2026) studied this question.

synapsesocial.com/papers/6a8fea0110c91c1e92621ff9 https://doi.org/10.1002/est2.70501

View Full Paper

Ask AI

Bookmark