Abstract
Modulating the electrocatalyst materials with different metal/metal oxides is a beneficial way to enhance the electrochemical reduction of CO2 into valuable chemical feedstock. Herein, a multicomponent system composed of Cu/CuxO-SnOx supported on nitrogen-doped carbon cuboids is studied as an efficient electrocatalyst system for CO2 reduction. Fine-tuning of the Cu/CuxO amount significantly altered the catalyst performance with regard to selectivity and overpotential. A higher overpotential was needed to primarily convert CO2 to formate in the presence of an appreciable amount of Cu (17 at. %), whereas the selectivity of the multicomponent system toward formate was enhanced (with a maximum FE of 69% at −1.1 V vs RHE) when the system had only a minute amount of Cu (0.86 at. %). Interestingly, optimizing the Cu amount resulted in generating formate with a FE of (39%) at low overpotential (−0.5 V vs RHE), which is a rarely reported performance for similar systems. Controlling the metal/metal oxide ratio altered the electron density of each component and changed the kinetics of the CO2 reduction pathways. Notably, the presence of Cu/CuxO and SnOx can suppress the HER and simultaneously reduce the overpotential.
Original language | English |
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Pages (from-to) | 10794-10806 |
Number of pages | 13 |
Journal | ACS Applied Energy Materials |
Volume | 6 |
Issue number | 21 |
DOIs | |
State | Published - 13 Nov 2023 |
Bibliographical note
Publisher Copyright:© 2023 American Chemical Society
Keywords
- CO
- Cu/SnO
- carbon support
- electrochemical reduction
- formate
- low overpotential
- metal/metal oxide
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering