Operando Spectroscopic Investigation of a Boron-Doped CuO Catalyst and Its Role in Selective Electrochemical C-C Coupling
- Authors
- Patra, Kshirodra Kumar; Park, Sojung; Song, Hakhyeon; Kim, Beomil; Kim, Wooyul; Oh, Jihun
- Issue Date
- Nov-2020
- Publisher
- American Chemical Society
- Keywords
- boron-doped copper oxide; C-C coupling; C2+hydrocarbons; electrochemical CO2reduction; gas diffusion electrode; operando ATR-SEIRAS
- Citation
- ACS Applied Energy Materials, v.3, no.11, pp 11343 - 11349
- Pages
- 7
- Journal Title
- ACS Applied Energy Materials
- Volume
- 3
- Number
- 11
- Start Page
- 11343
- End Page
- 11349
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/1054
- DOI
- 10.1021/acsaem.0c02284
- ISSN
- 2574-0962
- Abstract
- Partially positive-charged copper (Cuδ+) is known to boost the formation of highly valued multicarbon C2+ products during the electrochemical CO2 reduction reaction (CO2RR). In this work, we doped boron in copper oxide (B-CuO) to create Cuδ+ sites and studied two important aspects regarding the CO2RR: (1) the direct observation of the CO reaction intermediate on the Cuδ+ surface and (2) the role of Cuδ+ in enhancing C2+ selectivity. Operando attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) showed that distinct CO intermediates were present on CuO and B-CuO surfaces during the CO2RR. We observed that multiple CO adsorption sites and strong adsorption of the CO intermediate on the Cuδ+ surface promote the C-C coupling reaction in B-CuO. As a result, we achieved a C2+ Faradaic efficiency of 62.1% at -0.62 V versus reversible hydrogen electrode on B-CuO. In contrast, only 48% was achieved at -0.65 V on the CuO catalyst. © 2020 American Chemical Society.
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