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Title: Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO 2 Electroreduction on a Ag-Zn Alloy]

Abstract

We report on CO 2 electroreduction activity and selectivity of a polycrystalline AgZn foil in aqueous bicarbonate electrolyte. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) measurements show that the alloy foil was slightly enriched in zinc both at the surface and in the bulk, with a surface alloy composition of 61.3±5.4 at % zinc and with Ag 5Zn 8 as the most prominent bulk phase. AgZn is active for CO 2 reduction; CO is the main product, likely due to the weak CO binding energy of the surface, with methane and methanol emerging as minor products. Compared to pure silver and pure zinc foils, enhancements in activity and selectivity for methane and methanol are observed. A five-fold increase is observed in the combined partial current densities for methane and methanol at –1.43 V vs. the reversible hydrogen electrode (RHE), representing a four- to six-fold increase in faradaic efficiency. Here, such enhancements indicate the existence of a synergistic effect between silver and zinc at the surface of the alloy that contributes to the enhanced formation of further reduced products.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [3]
  1. Stanford Univ., Stanford, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1369412
Grant/Contract Number:  
AC02-76SF00515; 1066515
Resource Type:
Accepted Manuscript
Journal Name:
Energy Technology
Additional Journal Information:
Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2194-4288
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CO2 reduction; electrocatalysis; electrochemistry; methanol; metal alloys

Citation Formats

Hatsukade, Toru, Kuhl, Kendra P., Cave, Etosha R., Abram, David N., Feaster, Jeremy T., Jongerius, Anna L., Hahn, Christopher, and Jaramillo, Thomas F. Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO2 Electroreduction on a Ag-Zn Alloy]. United States: N. p., 2017. Web. doi:10.1002/ente.201700087.
Hatsukade, Toru, Kuhl, Kendra P., Cave, Etosha R., Abram, David N., Feaster, Jeremy T., Jongerius, Anna L., Hahn, Christopher, & Jaramillo, Thomas F. Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO2 Electroreduction on a Ag-Zn Alloy]. United States. doi:10.1002/ente.201700087.
Hatsukade, Toru, Kuhl, Kendra P., Cave, Etosha R., Abram, David N., Feaster, Jeremy T., Jongerius, Anna L., Hahn, Christopher, and Jaramillo, Thomas F. Mon . "Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO2 Electroreduction on a Ag-Zn Alloy]". United States. doi:10.1002/ente.201700087. https://www.osti.gov/servlets/purl/1369412.
@article{osti_1369412,
title = {Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO2 Electroreduction on a Ag-Zn Alloy]},
author = {Hatsukade, Toru and Kuhl, Kendra P. and Cave, Etosha R. and Abram, David N. and Feaster, Jeremy T. and Jongerius, Anna L. and Hahn, Christopher and Jaramillo, Thomas F.},
abstractNote = {We report on CO2 electroreduction activity and selectivity of a polycrystalline AgZn foil in aqueous bicarbonate electrolyte. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) measurements show that the alloy foil was slightly enriched in zinc both at the surface and in the bulk, with a surface alloy composition of 61.3±5.4 at % zinc and with Ag5Zn8 as the most prominent bulk phase. AgZn is active for CO2 reduction; CO is the main product, likely due to the weak CO binding energy of the surface, with methane and methanol emerging as minor products. Compared to pure silver and pure zinc foils, enhancements in activity and selectivity for methane and methanol are observed. A five-fold increase is observed in the combined partial current densities for methane and methanol at –1.43 V vs. the reversible hydrogen electrode (RHE), representing a four- to six-fold increase in faradaic efficiency. Here, such enhancements indicate the existence of a synergistic effect between silver and zinc at the surface of the alloy that contributes to the enhanced formation of further reduced products.},
doi = {10.1002/ente.201700087},
journal = {Energy Technology},
number = 6,
volume = 5,
place = {United States},
year = {2017},
month = {2}
}

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