Synthesis of MnO/C/Co₃O₄ nanocomposites by a Mn²⁺-oxidizing bacterium as a biotemplate for lithium-ion batteries

Abstract

The biotemplate and bioconversion strategy represents a sustainable and environmentally friendly approach to material manufacturing. In the current study, biogenic manganese oxide aggregates of the Mn 2+ -oxidizing bacterium Pseudomonas sp. T34 were used as a precursor to synthesize a biocomposite that incorporated Co (CMC-Co) under mild shake-flask conditions based on the biomineralization process of biogenic Mn oxides and the characteristics of metal ion subsidies. X-ray photoelectron spectroscopy, phase composition and fine structure analyses demonstrated that hollow MnO/C/Co 3 O 4 multiphase composites were fabricated after high-temperature annealing of the biocomposites at 800°C. The cycling and rate performance of the prepared anode materials for lithium-ion batteries were compared. Due to the unique hollow structure and multiphasic state, the reversible discharge capacity of CMC-Co remained at 650 mAh g -1 after 50 cycles at a current density of 0.1 Ag -1 , and the coulombic efficiency remained above 99% after the second cycle, indicating a good application potential as an anode material for lithium-ion batteries.

Carbon Metabolism of a Soilborne Mn(II)-Oxidizing Escherichia coli Isolate Implicated as a Pronounced Modulator of Bacterial Mn Oxidation

“…Therefore, the Mn oxide deposit amount (MnODA) formed by MB266 cells depended on both Mn oxide formation rate and nucleation processing by adsorption. The resorption-based Mn oxide aggregate processing was also confirmed in other Mn(II)-oxidizing bacteria [ 27 , 28 , 29 ], which reflects the naturally occurring Mn oxide mineralization by Mn(II)-oxidizing bacteria [ 30 ]. To date, the bacteria that utilize Mn oxidation for nutrient metabolism are usually identified at the anaerobic/aerobic oceanic interface [ 31 ]; the relationship between carbon metabolism and Mn oxidation in soilborne bacteria are still scarcely investigated.…”