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The phase transition behavior and charge storage mechanism of Pr$_2$MgZrO$_6$(PMM), an oxygen-intercalated pseudocapacitor, were investigated throughcrystal structure analysis, Raman spectroscopy, ac conductivity spectroscopy, Xray photoelectron spectroscopy, and electrochemical spectroscopy. The crystalstructure analysis and vibration studies revealed a phase transition in PMM,following the sequence 14 to 87 to 225. High temperature Raman spectroscopydemonstrated a significant feature of a monoclinic to tetragonal phasetransformation in PMM. The ac conductivity spectroscopy exhibited asemiconductor to metal transition in PMM. X-ray photoelectron spectroscopy ofthe Mn 2p state confirmed the presence of oxygen vacancies in PMM at roomtemperature. Furthermore, the electrochemical performance of PMM as anelectrode was evaluated. The PMM electrode displayed an intercalatedpseudocapacitive nature, exhibiting a maximum possible specific capacitance of257.57 F. The charge storage process of the PMM electrode was thoroughlyreviewed and discussed, shedding light on the underlying mechanisms.

Phase transition in oxygen-intercalated pseudocapacitor Pr$_2$MgZrO$_6$ electrode: A combined structural and conductivity analysis