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Title: Tailoring Electrochemical CO 2 Reduction on Copper by Reactive Ionic Liquid and Native Hydrogen Bond Donors

Journal Article · · Angewandte Chemie
 [1];  [1];  [2]; ORCiD logo [1];  [3]; ORCiD logo [1]
  1. Department of Chemical and Biomolecular Engineering Case Western Reserve University Cleveland OH 44106 USA
  2. Department of Chemistry New York University New York NY 10003 USA
  3. Department of Chemistry New York University New York NY 10003 USA, Simons Center for Computational Physical Chemistry at New York University New York NY 10003 USA

Abstract Electrochemical CO 2 reduction (CO 2 RR) on copper (Cu) shows promise for higher‐value products beyond CO. However, challenges such as the limited CO 2 solubility, high overpotentials, and the competing hydrogen evolution reaction (HER) in aqueous electrolytes hinder the practical realization. We propose a functionalized ionic liquid (IL) which generates ion‐CO 2 adducts and a hydrogen bond donor (HBD) upon CO 2 absorption to modulate CO 2 RR on Cu in a non‐aqueous electrolyte. As revealed by transient voltammetry, electrochemical impedance spectroscopy (EIS), and in situ surface‐enhanced Raman spectroscopy (SERS) complemented with image charge augmented quantum‐mechanical/molecular mechanics (IC‐QM/MM) computations, a unique microenvironment is constructed. In this microenvironment, the catalytic activity is primarily governed by the IL and HBD concentrations; former controlling the double layer thickness and the latter modulating the local proton availability. This translates to ample CO 2 availability, reduced overpotential, and suppressed HER where C 4 products are obtained. This study deepens the understanding of electrolyte effects in CO 2 RR and the role of IL ions towards electrocatalytic microenvironment design.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0023427; SC0019409
OSTI ID:
2204888
Alternate ID(s):
OSTI ID: 2274835
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 1 Vol. 136; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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