Effects on the structure and electrochemical reactivity of surface modified magnesium cobalt oxide

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 971; p. 118561
• Main Authors: Missaoui, Kahla, Ferchichi, Karima, Amdouni, Noureddine, Cosano, Daniel, Liu, Rui, Pan, Siyuan, Zhanning, He, Su, Yu, Luo, Mingzeng, Yang, Yong, Ortiz, Gregorio F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2024
• Subjects: Composite materials; Conductive Polymer; Hybrid battery; MgCoO2; Pickering emulsion; Hybrid battery; Conductive Polymer; MgCoO2; Pickering emulsion; Composite materials
• ISSN: 1572-6657
• DOI: 10.1016/j.jelechem.2024.118561

[Display omitted] •A thin film of conducting polyaniline layer is formed on the surface of MgCoO2.•The PANI@MgCoO2 composites are used in hybrid Na/Mg batteries.•This coating facilitates the Mg2+/Na+ transportation and enhances electron transfer.•A single-phase insertion reaction is found and preserved original cubic phase. Polyaniline coated magnesium cobalt oxide nanocomposites (PANI@MgCoO2) are synthesized by a cost-effective method. The structural, chemical, morphological, thermal and surface characterizations (X-ray diffraction, electron microscopy, thermogravimetry, Raman and X-ray photoelectron spectroscopies) confirm the presence of a thin layer of conducting polymer (∼40 nm) in which the benzenoid and quinoid (C6H4) rings are surrounded by imine (=N-) and amine (–NH-) nitrogen on the particles of the cubic oxide. Their electrochemical reactions are studied in magnesium cells using the dual combination of sodium and magnesium ions in the electrolyte. A strong interaction at the interface of PANI and MgCoO2 improved the electrochemical properties and revealed a single-phase insertion/extraction reaction mechanism into/from the cubic structure. These PANI@MgCoO2 nanocomposites exhibited enhanced reversible capacity (103.4 – 153mAhg−1) at ∼ 1 V vs. Mg2+/Mg, Warburg (26.5 Ω s−1/2) and diffusion (6.92·10-14 cm2 s−1) coefficients as compared to pristine material. These results show that the proposed coating can be used for electrodes in the field of rechargeable magnesium hybrid batteries (MHRBs).