Paulus Fau, Luthfi Mahardhika, Nur I. Khamidy, Mochammad G. I. Khan, Bayu Prasetya, Ria Yolanda Arundina, Resti Marlina, Eka Nurfani
Controlling the phase composition of MnO2 nanostructures is a powerful strategy for enhancing supercapacitor performance. This work demonstrates how sintering temperature directly influences the structure and capacitance of hydrothermally synthesized MnO2 nanorods. We found that heat treatment from 200 to 500 °C drives a phase evolution, introducing langbeinite impurities above 300 °C alongside the initial β-MnO2 (pyrolusite) phase. The key finding is that this specific phase mixture synergistically enhances it rather than degrading performance. The sample sintered at 500 °C exhibited a specific capacitance of 32 F g−1, a five-fold increase over the non-sintered material (6 F g−1). This study establishes a simple and effective sintering protocol to optimize the electrochemical properties of MnO2 nanorods by strategically engineering their crystal phase. © 2025 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
Department of Materials Engineering, Faculty of Industrial Technology, Institut Teknologi Sumatera (ITERA), Lampung, 35365, Indonesia; Department of Chemical Engineering, Universitas Indonesia, Depok, 16424, Indonesia; Research Center for Biomass and Bioproducts, National Research and Innovation Agency (BRIN), West Java, 16911, Indonesia; Center for Green and Sustainable Materials, Institut Teknologi Sumatera (ITERA), South Lampung, 35365, Indonesia
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