The Capacitive Property Enhancement of CoFeP-Ni(OH)<sub>2</sub>/Nickel Foam Electrodes via an Interfacial Integration Strategy for Asymmetric Supercapacitors

The Capacitive Property Enhancement of CoFeP-Ni(OH)<sub>2</sub>/Nickel Foam Electrodes via an Interfacial Integration Strategy for Asymmetric Supercapacitors

We report the fabrication of CoFeP-Ni(OH)<sub>2</sub>/nickel foam (NF) composite electrodes via a two-step strategy involving the hydrothermal synthesis of Ni(OH)<sub>2</sub> on nickel foam followed by the electrochemical deposition of CoFeP. The integration of the Ni(OH)<...

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Bibliographic Details
Main Authors: Meiying Cui, Meiying Pei, Seok Kim
Format: Article
Language:English
Published: MDPI AG 2025-07-01
Series:Molecules
Subjects:
phosphide
transition metal compounds
pseudocapacitor
asymmetric supercapacitors
electrodeposition
Online Access:https://www.mdpi.com/1420-3049/30/14/2986
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Summary:We report the fabrication of CoFeP-Ni(OH)<sub>2</sub>/nickel foam (NF) composite electrodes via a two-step strategy involving the hydrothermal synthesis of Ni(OH)<sub>2</sub> on nickel foam followed by the electrochemical deposition of CoFeP. The integration of the Ni(OH)<sub>2</sub> interlayer not only provides a structurally robust interface but also facilitates synergistic redox activity, thereby significantly boosting the pseudocapacitive behavior of the electrode. Comparative analysis with bare CoFeP/NF reveals that the presence of the Ni(OH)<sub>2</sub> layer contributes to enhanced charge transfer efficiency and an increased electroactive surface area. Among the samples prepared under varying deposition cycles, the optimized CoFeP-Ni(OH)<sub>2</sub>/NF electrode exhibits a high areal capacitance of 4244 mF cm<sup>−2</sup> at 2 mA cm<sup>−2</sup>. Furthermore, an asymmetric supercapacitor device assembled with CoFeP-Ni(OH)<sub>2</sub>/NF as the positive electrode and activated carbon as the negative electrode delivers a maximum energy density of 0.19 mWh cm<sup>−2</sup> at a power density of 0.37 mW cm<sup>−2</sup> and excellent cycling stability, retaining 72% of its initial capacitance after 5000 cycles at a high current density of 8 mA cm<sup>−2</sup>.
ISSN:1420-3049

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