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Title: Synergistic Cr 2 O 3 @Ag Heterostructure Enhanced Electrocatalytic CO 2 Reduction to CO

Journal Article · · Advanced Materials
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  1. Centre for Catalysis and Clean Energy Gold Coast Campus Griffith University Queensland 4222 Australia
  2. School of Chemical Engineering University of New South Wales Sydney NSW 2052 Australia
  3. Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China
  4. Department of Physics Illinois Institute of Technology Chicago IL 60616 USA
  5. The Centre for Microscopy and Microanalysis The University of Queensland St Lucia QLD 4072 Australia

Abstract The electrocatalytic CO 2 RR to produce value‐added chemicals and fuels has been recognized as a promising means to reduce the reliance on fossil resources; it is, however, hindered due to the lack of high‐performance electrocatalysts. The effectiveness of sculpturing metal/metal oxides (MMO) heterostructures to enhance electrocatalytic performance toward CO 2 RR has been well documented, nonetheless, the precise synergistic mechanism of MMO remains elusive. Herein, an in operando electrochemically synthesized Cr 2 O 3 –Ag heterostructure electrocatalyst (Cr 2 O 3 @Ag) is reported for efficient electrocatalytic reduction of CO 2 to CO. The obtained Cr 2 O 3 @Ag can readily achieve a superb FE CO of 99.6% at −0.8 V (vs RHE) with a high J CO of 19.0 mA cm −2 . These studies also confirm that the operando synthesized Cr 2 O 3 @Ag possesses high operational stability. Notably, operando Raman spectroscopy studies reveal that the markedly enhanced performance is attributable to the synergistic Cr 2 O 3 –Ag heterostructure induced stabilization of CO 2 •− /*COOH intermediates. DFT calculations unveil that the metallic‐Ag‐catalyzed CO 2 reduction to CO requires a 1.45 eV energy input to proceed, which is 0.93 eV higher than that of the MMO‐structured Cr 2 O 3 @Ag. The exemplified approaches in this work would be adoptable for design and development of high‐performance electrocatalysts for other important reactions.

Sponsoring Organization:
USDOE
OSTI ID:
1872150
Alternate ID(s):
OSTI ID: 1872151
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Vol. 34 Journal Issue: 29; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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