Operando Spectroscopic Investigation of a Boron-Doped CuO Catalyst and Its Role in Selective Electrochemical C–C CouplingClick to copy article linkArticle link copied!
- Kshirodra Kumar PatraKshirodra Kumar PatraDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaMore by Kshirodra Kumar Patra
- Sojung ParkSojung ParkDepartment of Chemical and Biological Engineering, College of Engineering, Sookmyung Women’s University, Yongsan-gu, Seoul 04310, Republic of KoreaMore by Sojung Park
- Hakhyeon SongHakhyeon SongDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaMore by Hakhyeon Song
- Beomil KimBeomil KimDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaMore by Beomil Kim
- Wooyul Kim*Wooyul Kim*Email: [email protected]Department of Chemical and Biological Engineering, College of Engineering, Sookmyung Women’s University, Yongsan-gu, Seoul 04310, Republic of KoreaMore by Wooyul Kim
- Jihun Oh*Jihun Oh*Email: [email protected]Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaMore by Jihun Oh
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.
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