Volume 58, Issue 44 pp. 15834-15840
Research Article

A Polymer Solution To Prevent Nanoclustering and Improve the Selectivity of Metal Nanoparticles for Electrocatalytic CO2 Reduction

Dr. Lei Zhang

Dr. Lei Zhang

Jiangsu Key Laboratory of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Zichao Wei

Zichao Wei

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Dr. Srinivas Thanneeru

Dr. Srinivas Thanneeru

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Michael Meng

Michael Meng

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Megan Kruzyk

Megan Kruzyk

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Prof. Gaël Ung

Prof. Gaël Ung

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

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Prof. Ben Liu

Corresponding Author

Prof. Ben Liu

Jiangsu Key Laboratory of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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Prof. Jie He

Corresponding Author

Prof. Jie He

Department of Chemistry, University of Connecticut, Storrs, CT, 06269 USA

Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269 USA

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First published: 29 August 2019
Citations: 113

Graphical Abstract

Ligands for nanocatalysts: Polymeric N-heterocyclic carbene (NHC) ligands are demonstrated to stabilize Au and Pd nanoparticles for CO2 electroreduction while simultaneously enhancing their selectivity over competitive proton reduction.

Abstract

The stability of metal nanocatalysts for electrocatalytic CO2 reduction is of key importance for practical application. We report the use of two polymeric N-heterocyclic carbenes (NHC) (polydentate and monodentate) to stabilize metal nanocatalysts (Au and Pd) for efficient CO2 electroreduction. Compared with other conventional ligands including thiols and amines, metal–carbene bonds that are stable under reductive potentials prevent the nanoclustering of nanoparticles. Au nanocatalysts modified by polymeric NHC ligands show an activity retention of 86 % after CO2 reduction at −0.9 V for 11 h, while it is less than 10 % for unmodified Au. We demonstrate that the hydrophobicity of polymer ligands and the enriched surface electron density of metal NPs through σ-donation of NHCs substantially improve the selectivity for CO2 reduction over proton.

Conflict of interest

The authors declare no conflict of interest.

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