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This content will become publicly available on January 15, 2019

Title: Metal ion cycling of Cu foil for selective C–C coupling in electrochemical CO 2 reduction

Here, electrocatalytic CO 2 reduction to higher-value hydrocarbons beyond C 1 products is desirable for applications in energy storage, transportation and the chemical industry. Cu catalysts have shown the potential to catalyse C–C coupling for C 2+ products, but still suffer from low selectivity in water. Here, we use density functional theory to determine the energetics of the initial C–C coupling steps on different Cu facets in CO 2 reduction, and suggest that the Cu(100) and stepped (211) facets favour C 2+ product formation over Cu(111). To demonstrate this, we report the tuning of facet exposure on Cu foil through the metal ion battery cycling method. Compared with the polished Cu foil, our 100-cycled Cu nanocube catalyst with exposed (100) facets presents a sixfold improvement in C 2+ to C 1 product ratio, with a highest C 2+ Faradaic efficiency of over 60% and H 2 below 20%, and a corresponding C 2+ current of more than 40 mA cm –2.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ; ORCiD logo [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature Catalysis
Additional Journal Information:
Journal Volume: 1; Journal Issue: 2; Journal ID: ISSN 2520-1158
Publisher:
Springer Nature
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1457051