Effect of a static magnetic field on the preparation of MnOOH and Mn₃O₄ by a hydrothermal process

Abstract

In this paper, the shape of the samples was changed by the magnetic field. Single-crystalline nanowires (20 nm in diameter and 1 μm in length) of MnOOH were obtained under zero magnetic fields. However, cubic particles of Mn3O4 were formed when a magnetic field was applied.

Dynamic compensation of MnOOH to mitigate the irregular dissolution of MnO2in rechargeable aqueous Zn/MnO2batteries

“…4b and S14 †). Furthermore, beneting from the dynamic [34][35][36][37][38][39][40] compensation of MnOOH, the Zn/MnO 2 battery with the Zn-Ce electrolyte achieved reversible capacity retention of 97.4% and a capacity of 130.1 mA h g −1 at 1 A g −1 aer 1000 cycles (vs. 40.5% and 75.8 mA h g −1 for the Zn/MnO 2 battery with the basic electrolyte), and identical results were obtained at a current density of 0.5 A g −1 (Fig. 4c and d).…”

“…(c and d) Long cycling performance of Zn/MnO 2 batteries with the basic electrolyte and Zn-Ce electrolyte at 0.5 and 1.0 A g −1 . (e) Comparison of electrochemical performance of the Zn/MnO 2 battery based on the Zn-Ce electrolyte with other Zn/MnO 2 batteries reported previously [34][35][36][37][38][39][40].…”

Mn3O4 hollow microcubes and solid nanospheres derived from a metal formate framework for electrochemical capacitor applications

“…The FT-IR spectra results evidenced the ion exchange reaction between HCOO À and OH À . As Mn(OH) 2 can be easily oxidized by oxygen in autoclave during the hydrothermal process, [38][39][40] Mn 3 O 4 was formed, and the formation process can be postulated below:…”

Magnetochemistry and chemical synthesis

“…Moreover, the Gibbs energy produced by the magnetic field is responsible for the formation of Mn 3 O 4 based on the thermodynamic calculation. [13] 2θ (Ο)…”