Heterogenized Pyridine-Substituted Cobalt(II) Phthalocyanine Yields Reduction of CO2 by Tuning the Electron Affinity of the Co Center

Alberto De Riccardis, Michelle Lee, Roman V. Kazantsev, Alejandro J. Garza, Guosong Zeng, David M. Larson, Ezra L. Clark, Peter Lobaccaro, Paul W.W. Burroughs, Ermelinda Bloise, Joel W. Ager, Alexis T. Bell, Martin Head-Gordon, Giuseppe Mele, Francesca M. Toma

Research output: Contribution to journalReview articlepeer-review

38 Scopus citations

Abstract

Conversion of CO2 to reduced products is a promising route to alleviate irreversible climate change. Here we report the synthesis of a Co-based phthalocyanine with pyridine moieties (CoPc-Pyr), which is supported on a carbon electrode and shows Faradaic efficiency ?90% for CO at 490 mV of overpotential (-0.6 V vs reversible hydrogen electrode (RHE)). In addition, its catalytic activity at -0.7 V versus RHE surpasses other Co-based molecular and metal-organic framework catalysts for CO2 reduction at this bias. Density functional theory calculations show that pyridine moieties enhance CO2 adsorption and electron affinity of the Co center by an inductive effect, thus lowering the overpotential necessary for CO2 conversion. Our study shows that CoPc-Pyr reduces CO2 at lower overpotential and with higher activity than noble metal electrodes, such as silver.

Original languageEnglish (US)
Pages (from-to)5251-5258
Number of pages8
JournalACS Applied Materials and Interfaces
Volume12
Issue number5
DOIs
StatePublished - Feb 5 2020

All Science Journal Classification (ASJC) codes

  • General Materials Science

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