Pyridine vs. Imidazole Axial Ligation on Cobaloxime Grafted Graphene: Hydrogen Evolution Reaction Insights

Author:

Sideri Ioanna K.,Charalambidis GeorgiosORCID,Coutsolelos Athanassios G.ORCID,Arenal RaulORCID,Tagmatarchis NikosORCID

Abstract

While cobaloximes have been protagonists in the molecular (photo)catalytic hydrogen evolution reaction field, researchers originally shed light on the catalytically active metallic center. However, the specific chemical environment of cobalt, including equatorial and axial ligation, has also a strong impact on the catalytic reaction. In this article, we aim to demonstrate how pyridine vs. imidazole axial ligation of a cobaloxime complex covalently grafted on graphene affects the hydrogen evolution reaction performance in realistic acidic conditions. While pyridine axial ligation mirrors a drastically superior electrocatalytic performance, imidazole exhibits a remarkable long-term stability.

Funder

Spanish MICINN

Government of Aragon

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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