Non-bonding interaction of dual atom catalysts for enhanced oxygen reduction reaction
- Hong Kong University of Science and Technology (HKUST) (Hong Kong)
- Yanshan Univ., Qinhuangdao (China)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Hong Kong Polytechnic Univ. (Hong Kong)
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- China University of Petroleum, Qingdao (China)
Here, we demonstrate the design of graphene-supported dual atom catalysts (DACs) for the four-electron oxygen reduction reaction (ORR), by utilizing the non-bonding interaction of counterpart metals (M) that synergistically tune the electronic properties and catalytic activity of the Fe active site in FeMN6-DAC and FeMN8-DAC systems, where M stands for Fe, Co, Ni, Cu, and Zn. More specifically, for Fe-M distances below 15Å, the non-bonding interaction is significant, making the system act as the DAC. We predicted that FeNiN6-DAC and FeNiN8-DAC exhibit a low ORR overpotential (ηORR) of 0.28 V and 0.47 V, respectively, which are at the summits of volcano plots. This low ηORR originates from the high Bader charge transfer coupled with high spin density at the Fe site in both the FeNiN6-DAC and FeNiN8-DAC systems, which weakens the adsorption of OH* intermediate while enhancing its desorption to H2O. Guided by these density functional theory (DFT) computational results, we synthesized FeCoN8-DAC and FeNiN8-DAC along with N-doped graphene and confirmed their structures with scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and electron spin resonance (ESR). We verify experimentally the catalytic activities and find that FeNiN8-DAC has the low experimental overpotential of 0.39 V with a Tafel slope of 47 mVdec-1. Based on these results, we propose a DFT-guided strategy to tune the charge transfer and spin population of the active site toward designing DACs for electrochemical ORR.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Institute for Energy Research (IER); National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2318648
- Journal Information:
- Nano Energy, Journal Name: Nano Energy Vol. 108; ISSN 2211-2855
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Graphene-supported single atom catalysts for high performance lithium-oxygen batteries
Transition metal-embedded two-dimensional C3N as a highly active electrocatalyst for oxygen evolution and reduction reactions
Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction
Journal Article
·
Wed Jan 10 19:00:00 EST 2024
· Nano Energy
·
OSTI ID:2500314
Transition metal-embedded two-dimensional C3N as a highly active electrocatalyst for oxygen evolution and reduction reactions
Journal Article
·
Mon Apr 22 20:00:00 EDT 2019
· Journal of Materials Chemistry. A
·
OSTI ID:1577579
Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction
Journal Article
·
Fri Feb 10 19:00:00 EST 2023
· Journal of Materials Chemistry. A
·
OSTI ID:2318652