A Cobalt Molecular Catalyst for Hydrogen Evolution Reaction with Record Activity in Phosphate Buffered Water Solution

16 November 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Herein, we show that [Cp*Co(2-ampy)I]I (2-ampy = 2-aminomethyl-pyridine) is an extremely active catalyst for HER, exhib- iting a record TOF of 109000 s-1 in phosphate buffered water solution (pH 7). The key to this remarkable activity stems from the establishment of a network of weak interactions in the second coordination sphere. As a matter of fact, both experimental and theoretical studies strongly suggest that the –NH2 functionality of 2-ampy ligand acts as an anchoring and orienting group for H2PO4- through the establishment of an in- termolecular hydrogen bonding with it that, in turn, intermolecularly donates a proton to Co–H liberating H2.

Keywords

Green Hydrogen
Hydrogen Evolution Reaction
Electrocatalysis
Cobalt Complexes
DFT Calculations

Supplementary materials

Title
Description
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Title
A Cobalt Molecular Catalyst for Hydrogen Evolution Reaction with Record Activity in Phosphate Buffered Water Solution
Description
Synthesis, characterization, electrochemical experiments, scan rate dependence, catalyst stability, pH dependency studies, RRDE experiments, computational methods.
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