Amorphous structures enriched with under-coordinated sites and defects are expected to reveal a promising performance in electrocatalysis and energy storage applications. We utilized Kirkendall effect to synthetize multicomponent polycrystalline, highly disordered hollow nanoparticles (NPs) that demonstrated promising performance in electrocatalytic oxygen evolution reaction and Li-ion batteries. Using real-time in situ synchrotron quick-scanning X-ray absorption spectroscopy we revealed a new doping mechanism that can be applied to synthetize highly doped and mixed transition metal oxide nanoparticles. The mechanism is based on the internalization of the dopant atoms adsorbed at the nanoparticle surface into the lattice of oxide via the mass flow of the host material caused by oxidation. As a result, simple surface modification of transition metal nanoparticles with different type of transition metal cations followed by oxidative annealing allowed synthesis of oxide structures that demonstrated enhanced capacity toward storage of Li-ions and current density of 10 mA/cm2 at 0.30 V overpotential in oxygen evolution reaction. The performance of nanoparticles prepared via oxidation induced doping has been compared with the performance of nanoparticles of similar compositions synthetized via classical direct synthesis.

Multicomponent hollow transition metal oxide nanoparticles: structure-property correlation

255th National Meeting (2018)

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