The effect of electrolyte cation on electrochemically induced activation and capacitive performance of Mn3O4 electrodes. (20th November 2019)

• Record Type: Journal Article
• Authors: Liu, Cuiyin; Chen, Yanfeng; Sun, Xian; Chen, Biyu; Situ, Yue; Huang, Hong
• Is Part Of: Electrochimica acta. Volume 324(2019)
• Publication Date: 2019-11-20
• Subjects: Mn3O4 -- Spinel-to-layer phase transition -- Nanosheets -- Electrolyte cation -- Capacitive performance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.134894
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A phase transition from spinel Mn3 O4 to layered birnessite has been reported through electrochemically induced activation in aqueous electrolyte for high performance supercapacitor, battery and water splitting applications. Here, Li2 SO4, MgSO4 and K2 SO4 aqueous electrolytes were used for the activation of Mn3 O4 electrode to investigate the effect of electrolyte cation on the electrochemical activation. The Mn3 O4 electrode exhibited different activated results in the three electrolytes, including the efficiency of phase transition, morphology of resulting birnessite and capacitive performance of the activated electrode. The cations affect the proceeding of H + insertion or the peeling-off of birnessite nanosheets during the phase transition process, resulting in the formation of nanosheet materials with different lateral dimensions. Effect of electrolyte cation on the electrochemical behavior of nanosheets electrode is further investigated. The nanosheets electrode activated in K2 SO4 exhibits capable capacitive behavior with reasonable specific capacitance and cycling stability. Understanding how different cations affect the phase transition of Mn3 O4 together with its capacitive performance will conduce to the development of manganese oxide electrode systems with high performance.