Cited by 396CO2 Reduction Techniques and CatalystsElectrocatalysts for Energy ConversionCarbon dioxide utilization in catalysis

Effect of Chloride Anions on the Synthesis and Enhanced Catalytic Activity of Silver Nanocoral Electrodes for CO 2 Electroreduction

Hsieh, Yu-Chi, Senanayake, Sanjaya D., Zhang, Yu, Xu, Wenqian, Polyansky, Dmitry E.·2015·ACS Catalysis

Abstract

Metallic silver (Ag) is known as an efficient electrocatalyst for the conversion of carbon dioxide (CO 2 ) to carbon monoxide (CO) in aqueous or nonaqueous electrolytes. However, polycrystalline silver electrocatalysts require significant overpotentials in order to achieve high selectivity toward CO 2 reduction, as compared to the side reaction of hydrogen evolution. Here we report a high-surface-area Ag nanocoral catalyst, fabricated by an oxidation–reduction method in the presence of chloride anions in an aqueous medium, for the electro-reduction of CO 2 to CO with a current efficiency of 95% at the low overpotential of 0.37 V and the current density of 2 mA cm –2 . A lower limit of TOF of 0.4 s –1 and TON > 8.8 × 10 4 (over 72 h) was estimated for the Ag nanocoral catalyst at an overpotential of 0.49 V. The Ag nanocoral catalyst demonstrated a 32-fold enhancement in surface-area-normalized activity, at an overpotential of 0.49 V, as compared to Ag foil. We found that, in addition to the effect on nanomorphology, the adsorbed chloride anions play a critical role in the observed enhanced activity and selectivity of the Ag nanocoral electrocatalyst toward CO 2 reduction. Synchrotron X-ray photoelectron spectroscopy (XPS) studies along with a series of control experiments suggest that the chloride anions, remaining adsorbed on the catalyst surface under electrocatalytic conditions, can effectively inhibit the side reaction of hydrogen evolution and enhance the catalytic performance for CO 2 reduction.

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Crossref · 10.1021/acscatal.5b01235

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Authors
Hsieh, Y.-C., Senanayake, S. D., Zhang, Y., Xu, W., & Polyansky, D. E.
Affiliations
Brookhaven National Laboratory (US)
Corresponding author
Polyansky, Dmitry E.
Venue
ACS Catalysis
Published
2015-08-11
Volume
5
Issue
9
Pages
5349-5356
ISSN
2155-5435 (ISSN-L)
OpenAlex
W2339405166
Cited by
396
References
61
Citations by year
2026: 15 · 2025: 34 · 2024: 39 · 2023: 27 · 2022: 37 · 2021: 62 · 2020: 44 · 2019: 42 · 2018: 37 · 2017: 33 · 2016: 24 · 2015: 2
FWCI
9.48
Type
journal article
Language
en
Open access
closed
Locations
ACS Catalysis (publishedVersion)
Funders
U.S. Department of Energy (DE-AC02-98CH10886, DE-SC0012704, 13-013)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
Keywords
electrochemical CO2 reduction, chloride anion, CO2 to CO conversion, hydrogen evolution suppression, silver electrocatalyst, current efficiency, turnover number, nanostructure morphology

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