Interaction of phosphate with lithium cobalt oxide nanoparticles: a combined spectroscopic and calorimetric study

Adsorption of small ions such as phosphate to the surfaces of metal oxides can significantly alter the behavior of these mate-rials, especially when present in nanoscale form. Lithium cobalt oxide is a good model system for understanding small-molecule interactions with emerging nanomaterials because of its widespread use in lithium ion batteries and its known activity as a water oxidation catalyst. Here we present a thermodynamic analysis of phosphate adsorption to LiCoO2 and corroborate the results with additional in situ techniques, including zeta potential measurements and ATR-FTIR, at pH values relevant to potential environmental release scenarios. Flow microcalorimetry measurements of phosphate interaction with LiCoO2 at pH 7.4 show that there are two distinct exothermic processes taking place. Time-sequence in situ ATR-FTIR with two-dimensional correlation analysis reveals the spectroscopic signatures of these processes. We interpret the data as an interaction of phosphate and LiCoO

Keywords:

• Organic chemistry
• Lithium cobalt oxide
• Adsorption
• Nanomaterials
• Zeta potential
• Inorganic chemistry
• Chemistry
• Phosphate
• Isothermal microcalorimetry
• Nanoparticle
• Lithium
• Metal
• Cobalt
• Ion

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