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Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy

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A case study using spectroscopy and computational modelling for Co speciation in a deep eutectic solvent.

Isuri N Perera¹, Garima S Dobhal², Jennifer M Pringle¹

¹Institute for Frontier Materials, Deakin University, Melbourne, Victoria 3125, Australia. cpg@deakin.edu.au.

Physical Chemistry Chemical Physics : PCCP

|July 26, 2024

Summary

This summary is machine-generated.

Cobalt recovery from waste is crucial due to supply shortages. This study reveals how sulfate additives alter cobalt speciation in ionic liquids, improving electrorecovery efficiency for clean energy technologies.

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Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

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Area of Science:

Materials Science
Electrochemistry
Sustainable Energy

Background:

Cobalt is essential for clean energy technologies, but supply deficits are projected.
Recycling end-of-life devices is vital for sustainable cobalt sourcing.
Electrorecovery offers a sustainable alternative to traditional cobalt extraction methods.

Purpose of the Study:

To investigate cobalt ion (Co2+) speciation in ethylene glycol:choline chloride (EG:ChCl) ionic liquid systems.
To understand how different cobalt sources (cobalt chloride vs. cobalt sulfate) affect Co2+ speciation.
To correlate Co2+ speciation with electrodeposition efficiency for improved cobalt electrorecovery.

Main Methods:

Utilized spectroscopic techniques including Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR), and Fourier-Transform Infrared Spectroscopy (FTIR).
Employed molecular dynamics simulations to complement experimental spectroscopic data.
Analyzed cobalt speciation in two distinct EG:ChCl systems based on cobalt chloride and cobalt sulfate precursors.

Main Results:

Identified distinct Co2+ speciation based on the cobalt source in EG:ChCl.
Observed monodentate coordination of sulfate to Co2+, forming [CoCl3(SO4)]3-, as the dominant species in the cobalt sulfate system.
Determined a homoleptic tetrahedral [CoCl4]2- as the dominant species in the cobalt chloride system.

Conclusions:

Gained fundamental insights into Co2+ speciation in EG:ChCl ionic liquids.
Established a correlation between cobalt speciation and electrochemistry, crucial for optimizing electrorecovery.
This knowledge contributes to designing safer and more efficient electrolytes for sustainable cobalt recycling.