Publication date: 28th August 2024
Glycerol, often regarded as a waste byproduct of biodiesel production, can be upgraded into various higher-value chemicals through selective partial oxidation. A promising ‘green’ pathway is the photoelectrochemical (PEC) oxidation of glycerol; due to the high value of the targeted products, such as dihydroxyacetone, this route offers a more favorable techno-economic case than, for example, PEC water splitting[RK1] . In this study, we present two key aspects of PEC glycerol oxidation using BiVO4 thin films as a model photoanode. First, we explore the impact of the electrolyte on the PEC performance of BiVO4. Our experimental findings demonstrate that both the anion and cation of the electrolyte profoundly influence performance, affecting parameters such as photocurrent, stability, and selectivity towards glycerol oxidation products. Notably, NaNO3 is identified as the optimal electrolyte for PEC glycerol oxidation with BiVO4, outperforming the previously favored Na2SO4. Second, we address the challenge of peak overlap in high-performance liquid chromatography (HPLC) analysis, particularly between glycerol, dihydroxyacetone, and formic acid. We propose a quantification protocol that resolves these peak overlaps using various detectors, including the refractive index (RI) and variable-wavelength UV detectors. Glycolaldehyde emerges as the most dominant product from BiVO4.
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