Operando Surface-Enhanced Infrared Spectroscopy Connects Interfacial Dynamics with Reaction Kinetics During Electrochemical CO2 Reduction on Copper
- Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis; Stanford Univ., CA (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis; Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
The reaction microenvironment plays a key role in dictating the selectivity of electrochemical CO2 reduction. However, understanding the chemical nature of this microenvironment under operating conditions remains a substantial challenge. For this study, we employed attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) in operando for simultaneous measurements of reaction kinetics and concentrations of reactants and intermediates at the reaction interface, all under controlled mass transport conditions. These operando measurements enable direct correlations between the reaction microenvironment, mass transport, and kinetics for a Cu electrocatalyst, such as higher local concentrations of CO2 under faster mass transport corresponding to higher rates of CO2 reduction. We observed that faster mass transport decreased the *CO coverage at less negative potentials (-0.6 VRHE) and increased the *CO coverage at more negative potentials (-1.1 VRHE). We developed a transport-coupled kinetic model that captures these spectroscopic observations and provides insight into the processes controlling interfacial concentrations of reactants and intermediates, aiding future efforts toward tailoring reaction microenvironments.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- AC52-07NA27344; SC0021266
- OSTI ID:
- 2497909
- Report Number(s):
- LLNL--JRNL-866547; 1101456
- Journal Information:
- ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 1 Vol. 15; ISSN 2155-5435
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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