Thin-walled hollow Au–Cu nanostructures with high efficiency in electrochemical reduction of CO<sub>2</sub> to CO

Zhou, Jun‐Hao; Lan, Dawei; Yang, Shengsong; Yu, Guanlong; Yuan, Kun; Dai, Linjie; Zhang, Yawen

doi:10.1039/c8qi00297e

Cited by 28 publications

(23 citation statements)

References 51 publications

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“…For Au 3 Cu and De-Au 3 Cu samples, peaks corresponding to (111) shift to higher angles, indicating the decrease of interplanar spacing with Cu atoms replacing Au atoms and the Au−Cu alloy forming (Figure 1e). 25 The magnified XRD pattern (Figure 1f) shows that peaks of Au 3 Cu-1 (treated with acetic acid for 5 h) stays unchanged compared to Au 3 Cu, while that of Au 3 Cu-2 (treated with nitric acid for 30 min) shows a negative shift. It could be understood that the nitric acid owns much stronger oxidative ability than acetic acid.…”

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confidence: 97%

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

et al. 2018

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Electroreduction (ER) of carbon dioxide (CO 2 ) is a promising way to curb excessive CO 2 emission and produce value-added products. Gold−copper (AuCu) alloys are known to exhibit eminent CO production performance toward CO 2 ER. However, it still remains a grand challenge to balance *COOH and *CO bonding and to further decrease CO onset potential. This Letter describes the construction of Cu vacancies at an abrupt surface over a dealloyed AuCu catalyst to effectively decrease the overpotential and increase CO faradaic efficiency. Dealloyed Au 3 Cu exhibited a 90.2% CO faradaic efficiency at −0.38 V vs RHE and a 418.60 A/g CO mass current density at −0.8 V. vs RHE, achieving the record for CO production among AuCu catalysts. Combining the experimental and theoretical results, we concluded that the improved performance primarily results from the enhanced *COOH absorption.

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confidence: 97%

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

et al. 2018

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“…However, the Au (111) peaks are shifted to higher angles as the increment of Cu content. This evidence demonstrates the formation of AuCu alloy shell since such a peak shift reflects the concomitant lattice contraction due to the incorporation of Cu atoms into the Au shell, 23 and the more Cu, the smaller lattice constant of the AuCu alloy. This trend is also in agreement with the d-spacing measurement from HAADF-STEM images (Figure S2).…”

Section: T H Imentioning

confidence: 87%

Enhanced CO₂ Electrochemical Reduction Performance over Cu@AuCu Catalysts at High Noble Metal Utilization Efficiency

et al. 2021

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The electrochemical CO 2 reduction reaction (CO 2 RR) represents a viable alternative to help close the anthropogenic carbon cycle and convert intermittent electricity from renewable energy sources to chemical energy in the form of value-added chemicals. The development of economic catalysts possessing high faradaic efficiency (FE) and mass activity (MA) toward CO 2 RR is critical in accelerating CO 2 utilization technology. Herein, an elaborate Au−Cu catalyst where an alloyed AuCu shell caps on a Cu core (Cu@AuCu) is developed and evaluated for CO 2 -to-CO electrochemical conversion. Specific roles of Cu and Au for CO 2 RR are revealed in the alloyed core−shell structure, respectively, and a compositional-dependent volcano-plot is disclosed for the Cu@AuCu catalysts toward selective CO production. As a result, the Au 2 −Cu 8 alloyed core−shell catalyst (only 17% Au content) achieves an FE CO value as high as 94% and an MA CO of 439 mA/mg Au at −0.8 V (vs RHE), superior to the values for pure Au, reflecting its high noble metal utilization efficiency.

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“…Compared with traditional shape catalysts such as nanosheets or nanoblocks, some special shapes help to create functional interfaces. − Anchoring Cu sites at the defect sites of alloy nanowires (NWs) can build a multi-metal cooperative interface. Li et al anchored a Cu atom pair on Pd 10 Te 3 alloy NWs and obtained an atom-pair catalyst (APC).…”

Section: Cu-bearing Alloy Catalysts For the Co2rrmentioning

confidence: 99%

Factors Influencing the Performance of Copper-Bearing Catalysts in the CO₂ Reduction System

Sun

Zhou

et al. 2021

ACS Energy Lett.

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In the face of the increasingly serious greenhouse effect and climate warming, carbon dioxide reduction (CO2RR) technology, which can produce valuable chemicals and fuels while consuming CO2, has become the focus of technology development. However, in the process of CO2 conversion into high-value products, it is still a challenge for electrocatalytic materials to achieve high efficiency and selectivity while inhibiting the byproducts of the hydrogen evolution reaction. These challenges can be solved by clarifying the factors regulating the catalytic performance of the CO2RR. With this background, we divided copper-bearing catalysts into bulk phase catalyst, copper-bearing compound catalyst, alloy catalyst, and single-atom catalyst and summarized the development status of each system in recent years. In addition, we further discussed the mechanisms affecting the performance of the CO2RR to help design catalysts with more effective selectivity. We hope this Review will inspire and encourage researchers to develop copper-bearing catalysts with better CO2RR performance.

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Thin-walled hollow Au–Cu nanostructures with high efficiency in electrochemical reduction of CO₂ to CO

Abstract: Thin-walled hollow Au–Cu nanostructures were synthesized via galvanic replacement and the Kirkendall effect between copper and gold, and they showed high efficiency for electro-reduction of CO2 to CO.

Cited by 28 publications

References 51 publications

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

Enhanced CO₂ Electrochemical Reduction Performance over Cu@AuCu Catalysts at High Noble Metal Utilization Efficiency

Factors Influencing the Performance of Copper-Bearing Catalysts in the CO₂ Reduction System

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Thin-walled hollow Au–Cu nanostructures with high efficiency in electrochemical reduction of CO2 to CO

Abstract: Thin-walled hollow Au–Cu nanostructures were synthesized via galvanic replacement and the Kirkendall effect between copper and gold, and they showed high efficiency for electro-reduction of CO2 to CO.

Cited by 28 publications

References 51 publications

Formation of Enriched Vacancies for Enhanced CO2 Electrocatalytic Reduction over AuCu Alloys

Formation of Enriched Vacancies for Enhanced CO2 Electrocatalytic Reduction over AuCu Alloys

Enhanced CO2 Electrochemical Reduction Performance over Cu@AuCu Catalysts at High Noble Metal Utilization Efficiency

Factors Influencing the Performance of Copper-Bearing Catalysts in the CO2 Reduction System

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Thin-walled hollow Au–Cu nanostructures with high efficiency in electrochemical reduction of CO₂ to CO

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

Formation of Enriched Vacancies for Enhanced CO₂ Electrocatalytic Reduction over AuCu Alloys

Enhanced CO₂ Electrochemical Reduction Performance over Cu@AuCu Catalysts at High Noble Metal Utilization Efficiency

Factors Influencing the Performance of Copper-Bearing Catalysts in the CO₂ Reduction System