Reversible Electrochemical Interface of Mg Metal and Conventional Electrolyte Enabled by Intermediate Adsorption

Conventional electrolytes made by mixing simple Mg salts and aprotic solvents, analogous to those in Li-ion batteries, are incompatible with Mg anodes because Mg metal readily reacts with such electrolytes, producing a passivation layer that blocks Mg transport. Here, we report that, through tuning a conventional electrolyte - Mg(TFSI) (TFSI is N(SO CF ) ) - with an Mg(BH ) cosalt, highly reversible Mg plating/stripping with a high Coulombic efficiency is achieved by neutralizing the first solvation shell of Mg cationic clusters between Mg and TFSI and enhanced reductive stability of free TFSI . A critical adsorption step between Mg atoms and active Mg cation clusters involving BH anions is identified to be the key enabler for reversible Mg plating/stripping through analysis of the distribution of relaxation times (DRT) from operando electrochemical impedance spectroscopy (EIS), operando electrochemical X-ray absorption spectroscopy (XAS), nuclear magnetic resonance (NMR), and density functional theory (DFT) calculations. 2+ 2+ - - 2+ - - 0 - 2 2 3 2 4 2

The nature of surface deposits following valeric acid interactions with Al2O3-supported Alkaline Earth Oxide catalysts: Towards cellulosic biofuels

Two Al2O3-supported alkaline earth metal oxide catalysts (MgO and BaO) were contacted with valeric acid at 250 °C. Each formed amounts of 5-nonanone (BaO more than MgO). A significant deposition of hydrocarbonaceous material onto the catalyst surface is noted. This adsorbed material is characterised using TGA and FTIR and relates to a carboxylate species.AM