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Dual-atom Ag2/graphene catalyst for efficient electroreduction of CO2 to CO

Journal Article · · Applied Catalysis B: Environmental
 [1];  [1];  [2];  [1];  [1];  [1]
  1. Univ. of Chinese Academy of Sciences, Beijing (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Electrochemical reduction of CO2 into value-added carbon compounds offers a promising strategy to mitigate global warming, but present challenges for chemistry due to the poor selectivity and stability of electrocatalysts. In this work, we report a dual-atom Ag2/graphene catalyst featuring well-defined AgN3-AgN3 active site for CO2 electrochemical reduction. This dual-atom catalyst can drive CO2 reduction reaction at a potential as high as -0.25 V, and exhibit excellent CO Faradic efficiency up to 93.4 % with a current density of 11.87 mA cm-2 at -0.7 V and long-term stability, far surpassing the single-atom Ag1/graphene and the traditional silver nanoparticle catalysts. Finally, DFT calculations reveal that the dual-atom Ag site lowers the barrier for the formation of *COOH by stabilizing the *CO2 through the concomitant interactions with the C and an O atom of CO2, resulting in excellent catalytic performance.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NNSFC); USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1616714
Journal Information:
Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: C Vol. 268; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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