Highly soluble Fe(III)-triethanolamine complex relevant for redox flow batteries

Abstract

Fe-triethanolamine is a promising candidate as anolyte for redox flow batteries (RFBs), owning to its low potential, high solubility and low cost. We report here a new dinuclear structure of this complex at solid state when prepared with a stoichiometric amount of triethanolamine and iron in basic medium, whereas more than two equivalents of ligands are usually used to prepare Fe-triethanolamine for RFBs application. We achieve a calibration curve to estimate Fe(III) concentration in solution and coulometric experiments highlight a oneelectron reduction process per iron atom, corresponding to the reduction of the two Fe(III) atoms of the dinuclear complex into Fe(II). A solubility higher than 1.2 mol dm-3 can be reached for Fetriethanolamine with the new synthesis proposed in this work. All-Fe alkaline RFBs implemented with Fe-triethanolamine exhibit good performances in terms of coulombic, voltage and energy efficiencies, and is stable over a hundred of cycles. A power density around 80-120

Development of an ELISA for the quantification of mycolactone, the cytotoxic macrolide toxin of Mycobacterium ulcerans

“…In contrast, using 0.2 M TEA as the ELISA running buffer improved assay sensitivity compared to phosphate-and TRIS-based ELISA buffers. TEA is widely used as a buffering agent with surfactant properties in consumer products [24,25] and in biomedical research [25,26,27,28].…”

Aqueous redox flow battery using iron 2,2‐bis(hydroxymethyl)‐2,2′,2′‐nitrilotriethanol complex and ferrocyanide as newly developed redox couple

“…The molecular structure of each Fe‐ligand complex is evaluated by Raman spectroscopy, and it was determined that the three Fe‐ligand complexes had similar molecular structures (Figure 5 and Figure S2). 30,31 …”

“…Yan's group suggested all‐iron RFBs using Fe(TEA) and Ferrocyanide as catholyte and anolyte, respectively 29 . In addition, Geneste's group suggested a new synthetic process to increase the aqueous solubility of Fe(TEA) complex 30 …”

“…29 In addition, Geneste's group suggested a new synthetic process to increase the aqueous solubility of Fe(TEA) complex. 30 In spite of such efforts, during the cycling of RFB, the bond between Fe ions and TEA ligand is readily dissociated, and the core Fe ions are reduced into their solid form, and then, hydrogen evolution reaction takes on the reduced Fe surface. 25,28,29,31 To alleviate this problem, Kwon's group presented 3-[bis (2-hydroxyethyl) amino]-2-hydroxypropanesulfonic acid (DIPSO) as a new organic ligand for Fe-based organometallic complex, and the Fe-DIPSO complex (Fe(DIPSO)) was used as negolyte of alliron aqueous RFB.…”

Stability enhancement for all‐iron aqueous redox flow battery using iron‐3‐[bis(2‐hydroxyethyl)amino]‐2‐hydroxypropanesulfonic acid complex and ferrocyanide as redox couple

“…Finally, the precipitated K 2 SO 4 solution was separated by centrifuge, and its final volume was adjusted to 20 mL with DIW. 47,53 Fe(DIPSO) solution was fabricated in a similar way to this process.…”