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Title: Facet‐Selective Deposition of Ultrathin Al 2 O 3 on Copper Nanocrystals for Highly Stable CO 2 Electroreduction to Ethylene

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [1];  [4];  [1];  [5];  [6];  [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Joint Center for Artificial Photosynthesis Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley California 94720 USA
  2. Institute of Functional Nano and Soft Materials Soochow University Suzhou 215123 China
  3. School of Advanced Materials Shenzhen Graduate School Peking University Shenzhen 518055 China
  4. Advanced Light Source Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley California 94720 USA
  5. Shenzhen Engineering Lab of Flexible Transparent Conductive Films Department of Materials Science and Engineering Harbin Institute of Technology Shenzhen 518055 China
  6. Department of Chemistry Wake Forest University Winston-Salem North Carolina 27109 USA
+ Show Author Affiliations

Abstract Catalysts based on Cu nanocrystals (NCs) for electrochemical CO 2 ‐to‐C 2+ conversion with high activity have been a subject of considerable interest, but poor stability and low selectivity for a single C 2+ product remain obstacles for realizing sustainable carbon‐neutral cycles. Here, we used the facet‐selective atomic layer deposition (FS‐ALD) technique to selectively cover the (111) surface of Cu NCs with ultrathin Al 2 O 3 to increase the exposed facet ratio of (100)/(111), resulting in a faradaic efficiency ratio of C 2 H 4 /CH 4 for overcoated Cu NCs 22 times higher than that for pure Cu NCs. Peak performance of the overcoated catalyst (Cu NCs/Al 2 O 3 ‐10C) reaches a C 2 H 4 faradaic efficiency of 60.4 % at a current density of 300 mA cm −2 in 5 M KOH electrolyte, when using a gas diffusion electrode flow cell. Moreover, the Al 2 O 3 overcoating effectively suppresses the dynamic mobility and the aggregation of Cu NCs, which explains the negligible activity loss and selectivity degradations of Cu NCs/Al 2 O 3 ‐10C shown in stability tests.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0004993
OSTI ID:
1826397
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 47 Vol. 133; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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