The Co3O4–Co3(PO4)2 nanocomposite supercapacitor system: Synthesis, electrochemistry, temperature effects, and computational studies

Bakare, Temitope E.; Akintemi, Eric O.; Ogundare, Segun A.; Zyl, Werner E. van

doi:10.1016/j.solidstatesciences.2022.106951

Solid State Sciences

2022

DOI: 10.1016/j.solidstatesciences.2022.106951

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The Co3O4–Co3(PO4)2 nanocomposite supercapacitor system: Synthesis, electrochemistry, temperature effects, and computational studies

Temitope E. Bakare

Eric O. Akintemi²,

Segun A. Ogundare³

et al.

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Cited by 9 publications

References 64 publications

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Modulating Coordination‐Driven Metal‐Oxygen Interaction Triggers Oxygen Evolution in Polymorphic and High‐Entropy Phosphate Electrocatalyst

Gayathri,

Arunkumar,

Saha

et al. 2024

Adv Funct Materials

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Engineering metal‐oxygen (M‒O) interactions for catalyzing oxygen evolution reaction (OER) by tuning the coordination geometry of metal sites is crucial for improving catalytic performance, which remains unexplored, especially in structurally diverse phosphate‐based catalysts. Herein, two NaCoPO4 (NCP) polymorphs with distinct metal coordinations: orthorhombic‐Pnma (CoO6) and hexagonal‐P65 (CoO4) denoted as O‐NCP and H‐NCP, respectively are synthesized through unique quenching‐based synthesis, to investigate the impact of coordination geometry on M‒O covalency and OER performance. The CoO4 (H‐NCP) polymorph delivered superior OER activity with low overpotential at 10 mA cm−2 (η10 = 303 mV) and long‐term stability than CoO6‐based O‐NCP. Spectroscopic and computational studies linked the superior activity of CoO4 to higher Co‒O covalency, enhanced metal electronic states near the Fermi level, and improved electrochemical reconstruction. Further, M‒O covalency regulated OER mechanism, where high‐covalent CoO4 follows conventional concerted proton‐electron transfer pathway, while CoO6 entails a non‐concerted pathway, where the lattice oxygen participation remains unfavorable due to downshifted O 2p band center. Further, OER‐active tetrahedral metal is demonstrated in a high‐entropy catalyst requiring lower η10 of ≈284 mV. This study unlocks a unique strategy for designing next‐generation OER catalysts with superior activity and durability, harnessing the interplay between metal coordination and metal‐oxygen covalency.

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Modulating Coordination‐Driven Metal‐Oxygen Interaction Triggers Oxygen Evolution in Polymorphic and High‐Entropy Phosphate Electrocatalyst

Gayathri,

Arunkumar,

Saha

et al. 2024

Adv Funct Materials

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show abstract

Bio-extract mediated green synthesis of bi-functional ammonium cobalt phosphate nanoflakes electrode/catalyst for supercapattery and ethanol oxidation

Thalthodi,

Sahadevan,

Sasikumar

et al. 2024

Inorganic Chemistry Communications

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Performance enhancement of λ-MnO2 supercapacitor device by using thermally induced amorphous phase of nickel and cobalt phosphates with hierarchical structures

Philip,

Kumar

2025

Journal of Alloys and Compounds

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The Co3O4–Co3(PO4)2 nanocomposite supercapacitor system: Synthesis, electrochemistry, temperature effects, and computational studies

Cited by 9 publications

References 64 publications

Modulating Coordination‐Driven Metal‐Oxygen Interaction Triggers Oxygen Evolution in Polymorphic and High‐Entropy Phosphate Electrocatalyst

Modulating Coordination‐Driven Metal‐Oxygen Interaction Triggers Oxygen Evolution in Polymorphic and High‐Entropy Phosphate Electrocatalyst

Bio-extract mediated green synthesis of bi-functional ammonium cobalt phosphate nanoflakes electrode/catalyst for supercapattery and ethanol oxidation

Performance enhancement of λ-MnO2 supercapacitor device by using thermally induced amorphous phase of nickel and cobalt phosphates with hierarchical structures

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