Roles of the base in the electrocatalytic reactions: A case study of glycine electrooxidation
Abstract 2,2,6,6-Tetramethyl-1-piperidine N -oxyl (TEMPO) and nickel hydroxide (Ni(OH) 2 ) mediated electrooxidation of glycine were performed and roles of bases in these two reactions were investigated by cyclic voltammetry. Trends of 2,4,6-collidine>2,6-lutidine>3-picoline>pyridine and KOH>NaOH>LiOH were observed in the studies of bases dependent activities on TEMPO and Ni(OH) 2 mediated glycine electrooxidation, respectively. Base effects can be rationalized by acid neutralization, base assisted deprotonation and the interaction between bases and catalysts. Highlights Bases play an important role in the glycine electrooxidation mediated by TEMPO and Ni(OH) 2 . A trend of 2,4,6-collidine>2,6-lutidine>3-picoline>pyridine was observed in TEMPO mediated glycine electrooxidation. The catalytic activity of Ni(OH) 2 mediated glycine electrooxidation is highest in KOH, followed by NaOH and LiOH. Acid neutralization, base assisted deprotonation and the interaction between bases and catalysts result in base effects.
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