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Boosting Tunable Syngas Formation via Electrochemical CO 2 Reduction on Cu/In 2 O 3 Core/Shell Nanoparticles.

Authors :
Xie H
Chen S
Ma F
Liang J
Miao Z
Wang T
Wang HL
Huang Y
Li Q
Source :
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2018 Oct 31; Vol. 10 (43), pp. 36996-37004. Date of Electronic Publication: 2018 Oct 19.
Publication Year :
2018

Abstract

In this work, monodisperse core/shell Cu/In <subscript>2</subscript> O <subscript>3</subscript> nanoparticles (NPs) were developed to boost efficient and tunable syngas formation via electrochemical CO <subscript>2</subscript> reduction for the first time. The efficiency and composition of syngas production on the developed carbon-supported Cu/In <subscript>2</subscript> O <subscript>3</subscript> catalysts are highly dependent on the In <subscript>2</subscript> O <subscript>3</subscript> shell thickness (0.4-1.5 nm). As a result, a wide H <subscript>2</subscript> /CO ratio (4/1 to 0.4/1) was achieved on the Cu/In <subscript>2</subscript> O <subscript>3</subscript> catalysts by controlling the shell thickness and the applied potential (from -0.4 to -0.9 V vs reversible hydrogen electrode), with Faraday efficiency of syngas formation larger than 90%. Specifically, the best-performing Cu/In <subscript>2</subscript> O <subscript>3</subscript> catalyst demonstrates remarkably large current densities under low overpotentials (4.6 and 12.7 mA/cm <superscript>2</superscript> at -0.6 and -0.9 V, respectively), which are competitive with most of the reported systems for syngas formation. Mechanistic discussion implicates that the synergistic effect between lattice compression and Cu doping in the In <subscript>2</subscript> O <subscript>3</subscript> shell may enhance the binding of *COOH on the Cu/In <subscript>2</subscript> O <subscript>3</subscript> NP surface, leading to the enhanced CO generation relative to Cu and In <subscript>2</subscript> O <subscript>3</subscript> catalysts. This report demonstrates a new strategy to realize efficient and tunable syngas formation via rationally designed core/shell catalyst configuration.

Details

Language :
English
ISSN :
1944-8252
Volume :
10
Issue :
43
Database :
MEDLINE
Journal :
ACS applied materials & interfaces
Publication Type :
Academic Journal
Accession number :
30303003
Full Text :
https://doi.org/10.1021/acsami.8b12747