Cu-CuOx/rGO catalyst derived from hybrid LDH/GO with enhanced C2H4 selectivity by CO2 electrochemical reduction. Issue 40 (September 2020)

• Record Type: Journal Article
• Authors: Altaf, Naveed; Liang, Shuyu; Iqbal, Rashid; Hayat, Mazhar; Reina, Tomas Ramirez; Wang, Qiang
• Is Part Of: Journal of CO₂ utilization. Issue 40(2020)
• Publication Date: 2020-09
• Subjects: Electrochemical CO2 reduction -- Copper catalyst -- Graphene oxide -- Ethylene production -- Electric conductivity; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2020.101205
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: New electro-catalyst ER-Cu5 -LDH/rGO was designed from Cu5 Al-CO3 hybrid LDH/GO precursor. The catalyst exhibited high C2 H4 faradaic efficiency and C2 H4 partial current density. Introduction of rGO significantly increase the electric conductivity of ER-Cu5 -LDH/rGO. LDHs precursor can lead to a high dispersion of active copper species. ER-Cu5 -LDH/rGO is promising for electrochemical conversion of CO2 into C2 H4 . Abstract: Electrochemical CO2 conversion to value-added fuels and chemicals enabled by suitable heterogeneous catalysts has attained great attention given its economic viability and overall process efficiency. Herein, we have designed a new electro-catalyst ER-Cu5 -LDH/rGO using electro-reduction method from Cu5 Al-CO3 hybrid LDH/GO precursor for efficient CO2 reduction reaction (CO2 RR). Interestingly, the ER-Cu5 -LDH/rGO catalyst presented a higher C2 H4 production selectivity than the ER-Cu5 -LDH catalyst without rGO. The obtained ER-Cu5 -LDH/rGO exhibited a high C2 H4 faradaic efficiency (FE) up to 54 % and a high C2 H4 partial current density of ‒11.64 mA/cm 2 at ‒1.2 V vs. RHE. It also exhibited excellent stability up to 50 h. The total FE of gaseous and liquid products for ER-Cu5 -LDH/rGO is closed to 100 %. The morphological changes during CO2 RR were monitored using SEM analyses for catalyst stability examination. The influence of electrolyte or pH on the electro-catalytic performance of ER-Cu5 -LDH/rGO were studied. In order to reflect the superiority of LDH precursors, a control catalyst containing Cu2 O supported on rGO (ER-Cu2 O/rGO) was prepared and comparatively studied. Overall, our hybrid catalyst system ER-Cu5 -LDH/rGO is very promising materials for CO2 conversion to C2 H4, displaying remarkable FE, high C2 H4 partial current density, and the excellent stability. Such a commendable behavior is ascribed to the excellent dispersion of active copper species as well as the superior electric conductivity of rGO.