|About this Abstract
|MS&T22: Materials Science & Technology
|Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|Dopamine Assisted Phase Transformation and Electrochemical Charge Storage Properties of Vanadium Oxide/Carbon Composite Electrodes
|Ryan Andris, Timofey Averianov, Ekaterina Pomerantseva
|On-Site Speaker (Planned)
Carbon containing nanocomposites are a class of materials capable of improving the electronic conductivity of metal oxides. In this work, chemically pre-intercalated dopamine (DOPA) molecules were used as both reducing agent and carbon precursor to prepare a variety of vanadium oxide/carbon composites via post-synthesis heat treatments. We found that the phase composition and morphology of the produced composites are influenced by the DOPA concentration used to synthesize the (DOPA)xV2O5 precursors. An increase of DOPA concentration led to more pronounced reduction of vanadium and a higher fraction of carbon in the composites’ structure. The electrochemical charge storage properties of the synthesized nanocomposites were evaluated in Li-ion cells. δ-V2O5∙nH2O/C, H2V3O8/C, VO2(B)/C, and V2O3/C electrodes delivered high initial capacities of 214, 252, 279, and 637 mAh·g-1, respectively. The insights provided by this investigation open the possibility of creating new nanocomposite oxide/carbon electrodes for a variety of applications that require redox activity.