Ionic liquid-based electrolysis-deposition for modulating Pb crystal facets to boost CO2 electroreduction

Chongyang Jiang; Shaojuan Zeng; Jiaqi Feng; Guilin Li; Zongxu Wang; Kuilin Peng; Lu Bai; Xiangping Zhang

doi:10.1039/D2GC04622A

Ionic liquid-based electrolysis-deposition for modulating Pb crystal facets to boost CO₂ electroreduction†

Chongyang Jiang,^ab Shaojuan Zeng,*^a Jiaqi Feng,^c Guilin Li,^a Zongxu Wang,^a Kuilin Peng,^a Lu Bai

^a and Xiangping Zhang

*^ab

Author affiliations

* Corresponding authors

^a Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
E-mail: xpzhang@ipe.ac.cn, sjzeng@ipe.ac.cn
Fax: +8610 6255 8174

^b School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China

^c Key Laboratory of Colloid and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Abstract

The crystal facet of electrodes is one of the main factors affecting the activity of CO₂ electroreduction. Herein, a new ionic liquid (IL)-based electrolysis-deposition (ED) method was developed for modulating the Pb crystal facet to boost CO₂ electroreduction. ED-Pb with an electrodeposition time of 900 s showed a high formate partial current density of 110.8 mA cm⁻² with over 80% formate faradaic efficiency at −2.4 V (vs. Ag/Ag⁺), which is much higher than values using a Pb planar electrode with 19.8 mA cm⁻² partial current density and 70% faradaic efficiency. Experimental results and density functional theory calculations revealed that ED-Pb catalysts have the dominant Pb(111) crystal facet due to the different adsorption energies of the IL on the crystal facet, and the improved performance is attributed to the low Gibbs free energy of OCHO* intermediates on the Pb(111) crystal facet. This work provides a new strategy for regulating the structures of electrocatalysts for high-activity CO₂ electroreduction.

This article is part of the themed collection: Advances in Electrosynthesis for a Greener Chemical Industry

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Article information

DOI: https://doi.org/10.1039/D2GC04622A
Article type: Paper
Submitted: 05 Dec 2022
Accepted: 01 Mar 2023
First published: 11 Mar 2023

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Green Chem., 2023,25, 2846-2852

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Ionic liquid-based electrolysis-deposition for modulating Pb crystal facets to boost CO₂ electroreduction

C. Jiang, S. Zeng, J. Feng, G. Li, Z. Wang, K. Peng, L. Bai and X. Zhang, Green Chem., 2023, 25, 2846 DOI: 10.1039/D2GC04622A

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