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Electrocatalytic Hydrogen Evolution with Gallium Hydride and Ligand-centered Reduction

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Journal Chem Sci
Specialty Chemistry
Date 2019 Mar 19
PMID 30881656
Citations 3
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Abstract

Ga chloride tetrakis(pentafluorophenyl)porphyrin () was synthesized and shown to be a highly active and stable post-transition metal-based electrocatalyst for the hydrogen evolution reaction (HER). Electrochemical and spectroscopic studies indicate that both the first and second reduction events of are ligand-centered. The 2e-reduced form reacts with a proton to give Ga-H species (-H), which undergoes protonolysis with Brønsted acids to produce H. The identification of key intermediates , , and -H leads to a catalytic cycle, which is valuable for the fundamental understanding of the HER. This study presents a rare but highly active HER electrocatalyst with unusual features, including ligand-centered electron transfer and formation of post-transition metal hydride.

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