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Multi-Metal Oxide Electrocatalysts and Magnetic Field Assistance for High Performance Li- O2 Batteries
You are invited to a SafeREnergy Seminar
Date: Tuesday, 6th August 2024
Time: 12:00pm – 1:00pm (AEST)
Join here: https://deakin.zoom.us/j/85465197172?pwd=uP4AbymtdFvP7QE3lwrm49kg73euEX.1&from=addon
Multi-Metal Oxide Electrocatalysts and Magnetic Field Assistance for High Performance Li- O2 Batteries
Mr Yimin Chen, PhD Candidate, Deakin University
Multi-metal oxides (MMOs) have emerged as promising electrocatalysts for high-performance Li-O2 batteries (LOBs) due to their tailored intrinsic properties. However, the complex nature of MMOs, with multiple elements involved, has made it challenging to fully comprehend the electrochemical behavior of MMOs in relation to the metal composition.
Herein, we systematically synthesized a series of spinel MMOs, including Ni-Co-Fe, Mn-Co-Fe, and Ni-Mn-Fe oxides, by doping Ni, Co, or Mn into spinel Fe3O4 via a hydrothermal method. The properties of the obtained MMOs, including metal element cooperation, oxygen vacancy, and substitution positions of the metal cations, are carefully examined.
We further evaluated the obtained MMOs as electrocatalysts in LOBs to investigate the dependency between their metal composition and electrocatalytic properties. Interestingly, we found the ratio of Fe3+/Fe2+ in the MMOs can be changed by matching different doping elements, affecting the cycling stability of LOBs with Fe-based MMOs. In addition, more oxygen vacancy in the crystal structure of MMOs can be obtained by doping more Ni and Co atoms, which facilitates electron/Li+ transportation and oxygen adsorption. Moreover, the Mn-Co-Fe oxides are the magnetic materials. we combine modifications of the internal magnetic electrocatalysts and external magnetic fields to enhance oxygen reactions achieving substantial improvements in the capacity and overpotential of the LOBs.
This systematic investigation of the MMO composition has provided a profound understanding of MMO electrocatalysts, offering valuable insights for designing and unlocking a promising avenue for magnetic field-assisted LOBs.
Yimin Chen is a PhD candidate under the supervision of Professor Ying (Ian) Chen and Doctor Baozhi Yu at the Institute for Frontier Materials, Deakin University, Australia. His current research focuses on Li-O2 batteries, including cathode catalysts, external field assistance, oxygen evolution reaction, and oxygen reduction reaction.