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NanoEnergy - Carbon-based spherical nanocomposites for electrochemical energy storage

Subject Area Synthesis and Properties of Functional Materials
Experimental Condensed Matter Physics
Physical Chemistry of Solids and Surfaces, Material Characterisation
Term from 2017 to 2023
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 379644293
 
Final Report Year 2023

Final Report Abstract

In the NanoEnergy project we developed and studied new carbon-based hybrid nanomaterials in which in particular conversion materials with high potential capacity for energy storage have been investigated. We exploited nanoscaling and carbon-networks in which active material is embedded to accommodate strain and to reduce kinetic limitations of the macroscopic counterparts of electrode materials. With our Polish partner team, we investigated in a series of manuscript various functionalised hollow carbon spheres (HCS), among them the remarkable example of ultra-small Fe3O4 nanoparticles uniformly decorated on HCS. This material displays excellent electrochemical cycling performance that exceeds the theoretical bulk capacity of Fe3O4 by far and shows a reversible capacity 1050 mAh/g in cycle 250. This outstanding electrochemical performance can be traced back to the formation and decomposition of a capacitative surface layer during dis/charging. A further important result is the usage of polystyrene waste to produce porous carbon flakes which have been applied as supercapacitors. In addition, both our team as well as further collaboration partners produced and investigated electrode materials such as, a variety hierarchically structured V2O3/C, α- and h-MoO3, ZnO/C, MoO2/C, TiO2/C, WOx/C, and WS2/C nanocomposites. In addition, MXenebased hybrid materials such as Ti3C2, Nb2C, V2C and their composites have been prepared by a selective etching-based process and yielded very good cycling stabilities.

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