Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105168
Keywords
Cu-Ag; Bifunctional catalyst; Carbon dioxide reduction; Electronic structure
Categories
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20172010106300]
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20172010106300]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1091158]
- Brain Korea 21 PLUS project for Center for Creative Industrial Materials [F18SN25D1706]
- POSCO Steel/Green Science Project
- Korea Evaluation Institute of Industrial Technology (KEIT) [20172010106300] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019R1A2C1091158] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
Nanostructured catalysts have been extensively demonstrated for electrochemical CO2 reduction. But, efforts to understand the mechanism of bimetallic catalysts have been limited. Here, we study electronic structures in bimetallic Cu/Ag layered catalysts to eliminate geometrical effects on the electrocatalytic characteristics. We found that the interfacial interaction between Cu and Ag affects the valence electronic states as confirmed by synchrotron radiation photoelectron spectroscopy and density functional theory calculation. The Ag adatom on Cu surface decreases charge density by forming an additional bond with Cu. As a result, the binding energy of CO intermediate increases on the surface. As the thickness of Ag layer increases, the effect of interfacial interaction of Cu/Ag gradually weakened and the center of d-states downshifted from 4.38 to 5.28 eV. The optimized Cu/Ag layered catalyst exhibited bifunctional catalytic selectivity with high CO faradaic efficiency (FE) = 89.1% at -0.8 V-RHE and high methane FE = 65.3% at -1.2 V-RHE.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available