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 Mn²⁺-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/Co₃O₄ 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.

摘要

生物模板和生物转化策略代表了一种可持续且环保的材料制造方法。在当前的研究中，Mn ²⁺氧化细菌假单胞菌属的生物源氧化锰聚集体。基于生物锰氧化物的生物矿化过程和金属离子补贴的特性，以T34为前驱体，在温和的摇瓶条件下合成了一种掺入Co（CMC-Co）的生物复合材料。X 射线光电子能谱、相组成和精细结构分析表明空心 MnO/C/Co ₃ O ₄生物复合材料在 800°C 下高温退火后制备多相复合材料。比较了制备的锂离子电池负极材料的循环性能和倍率性能。由于独特的中空结构和多相态，CMC-Co在0.1 Ag ^–1电流密度下循环50次后的可逆放电容量保持在650 mAh g ^–1，第二次循环后库仑效率保持在99%以上，表明作为锂离子电池负极材料具有良好的应用潜力。