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摘要
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Understanding how structural symmetry, morphology, and atomic/electronic configurations influence electrochemical charge storage in bimetallic oxide nanostructures remains a critical challenge. In this study, Ni ions incorporated MoO3 (Ni: 0, 0.005, 0.025, and 0.030 M) nanostructures were synthesized via a hydrothermal method to investigate structure-property relationships in energy storage. The Ni doping induces diverse morphologies – flakes, spheres, needles, and flowers - depending on concentration. X-ray diffraction (XRD) and Raman spectroscopy confirm the coexistence of h-MoO3 and α-MoO3 phases, along with α-Ni(OH)2 in the optimized sample (NMO-2, 0.025 M Ni). NMO-2 exhibits a high specific capacitance of 277 F/g from a two-electrode cell and stable cyclic performance over 5000 cycles at 200 mA/g. Synchrotron x-ray spectroscopy reveals the transformation from distorted to regular octahedral coordination in MoO3, while in situ Raman spectroscopy demonstrates a reversible phase change from α-Ni(OH)2 to β-Ni(OH)2 under electrochemical cycling. These structural and phase transitions allow efficient ionic diffusion and charge transfer. This work provides critical insight into the role of structural symmetry and local atomic coordination in governing the electrochemical performance of bimetallic oxide-based energy storage systems. |
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