Dendritic Ag/Pd Alloy Nanostructure Arrays for Electrochemical CO<sub>2</sub> Reduction

Han, Jie; Li, Shasha; Chen, Jiaye; Liu, Yongqiang; Geng, Dongsheng; Wang, Dawei; Zhang, Lichun

doi:10.1002/celc.202000405

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…Generally speaking, both doping and alloying can adjust the electronic structure of metals, thus effectively promoting the reaction kinetics [9,21] . X‐ray photoelectron spectroscopy (XPS) analysis further explores the chemical states of each component in the nanocomposite and the shift in electron state around Ag and Sn.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, a lot of efforts have been devoted to modulating Ag‐based catalysts’ size, morphology and structure, aiming at boosting their electrocatalytic performance [9–13] . Especially the formation of defects in nano Ag materials has been reported to obtain high selectivity toward C1 production, which is due to the destruction of the local spatial symmetry and ordered arrangement around the crystal from the defects.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Wang

et al. 2021

Chemistry An Asian Journal

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Silver (Ag)‐based materials are considered to be promising materials for electrochemical reduction of CO2 to produce CO, but the selectivity and efficiency of traditional polycrystalline Ag materials are insufficient; there still exists a great challenge to explore novel modified Ag based materials. Herein, a nanocomposite of Ag and SnO2 (Ag/SnO2) for efficient reduction of CO2 to CO is reported. HRTEM and XRD patterns clearly demonstrated the lattice destruction of Ag and the amorphous SnO2 in the Ag/SnO2 nanocomposite. Electrochemical tests indicated the nanocomposite containing 15% SnO2 possesses highest catalytic selectivity featured by a CO faradaic efficiency (FE) of 99.2% at −0.9 V versus reversible hydrogen electrode (vs RHE) and FE>90% for the CO product at a wide potential range from −0.8 V to −1.4 V vs RHE. Experimental characterization and analysis showed that the high catalytic performance is attributed to not only the branched morphology of Ag/SnO2 nanocomposites (NCs), which endows the maximum exposure of active sites, but also the special adsorption capacity of abundant defect sites in the crystal for *COOH (the key intermediate of CO formation), which improves the intrinsic activity of the catalyst. But equally important, the existed SnO2 also plays an important role in inhibiting hydrogen evolution reaction (HER) and anchoring defect sites. This work demonstrates the use of crystal defect engineering and synergy in composite to improve the efficiency of electrocatalytic CO2 reduction reaction (CO2RR).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Wang

et al. 2021

Chemistry An Asian Journal

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“…The surface composed of accumulated nano-spherical Cu 2 O was generated after growing the Cu 2 O shell, as compared to the pristine ZnO core. This coarse structure generally had a larger external surface area and could provide more active sites [30,31]. The Cu 2 O sample showed a similar morphology.…”

Section: Xzno@ycu 2 O Catalystmentioning

confidence: 96%

Core-Shell ZnO@Cu2O as Catalyst to Enhance the Electrochemical Reduction of Carbon Dioxide to C2 Products

Zhu

Ren

et al. 2021

Catalysts

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The copper-based catalyst is considered to be the only catalyst for electrochemical carbon dioxide reduction to produce a variety of hydrocarbons, but its low selectivity and low current density to C2 products restrict its development. Herein, a core-shell xZnO@yCu2O catalysts for electrochemical CO2 reduction was fabricated via a two-step route. The high selectivity of C2 products of 49.8% on ZnO@4Cu2O (ethylene 33.5%, ethanol 16.3%) with an excellent total current density of 140.1 mA cm−2 was achieved over this core-shell structure catalyst in a flow cell, in which the C2 selectivity was twice that of Cu2O. The high electrochemical activity for ECR to C2 products was attributed to the synergetic effects of the ZnO core and Cu2O shell, which not only enhanced the selectivity of the coordinating electron, improved the HER overpotential, and fastened the electron transfer, but also promoted the multielectron involved kinetics for ethylene and ethanol production. This work provides some new insights into the design of highly efficient Cu-based electrocatalysts for enhancing the selectivity of electrochemical CO2 reduction to produce high-value C2 products.

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“…[6d,10] For instance, Han et al [11] have reported an enhancement of CO production even at lower potentials by creating a Pd and ceria interface. A recent study by Zhang and co-workers [12] stressed the benefit of forming AgÀ Pd alloy dendritic nanostructure to enhance CO production. They achieved 98.6 % FE for CO at À 0.80 V vs RHE with dendrites containing 70.0 % Ag and 30.0 % Pd.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐thin Pd and CuPd Bimetallic Alloy Nanosheets for Electrochemical Reduction of CO₂

Zhang

Mosali

et al. 2022

ChemElectroChem

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Pd is an attractive electrocatalyst for the conversion of CO 2 to CO. Herein, we report the synthesis of ultrathin Pd nanosheets with a (111) exposed facet which enables CO evolution to be achieved in a CO 2 saturated 0.1 m KHCO 3 solution in a conventional H-cell with a faradaic efficiency of 74 � 4 % at À 0.75 V vs RHE and a partial current density (calculated based on the geometric area) of À 0.65 mA cm À 2 . Further, to reduce the cost, Cu was introduced into the Pd nanosheets to form Cu x Pd y bimetallic alloy nanosheets with (111) exposed planes. The composition of the Cu x Pd y alloy played a significant role in determining the nature of the nanosheet structure and the product selectivity. When 50 % of the Pd was replaced by Cu, competitive CO evolution could still be achieved relative to use of purely Pd nanosheets with 57 � 5 % of CO achieved at À 0.85 V vs RHE and a partial current density of À 0.9 mA cm À 2 . Under flow-cell conditions with a higher CO 2 mass transport rate, CuPd nanosheets exhibited enhanced current densities in the range of À 5 mA cm À 2 to À 35 mA cm À 2 but with a negligible change in faradaic efficiencies irrespective of the applied potential in a 1.0 m KHCO 3 medium. The use of a 1.0 m KOH solution further improved the catalytic performance generating 71 � 3 % of CO with a partial current density of À 58 � 2 mA cm À 2 at a low potential of À 0.6 V vs RHE. Post electrolysis characterization revealed structural transformations occurred during electrolysis that impacted the product selectivity of some catalysts.

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Dendritic Ag/Pd Alloy Nanostructure Arrays for Electrochemical CO₂ Reduction

Cited by 13 publications

References 39 publications

Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Core-Shell ZnO@Cu2O as Catalyst to Enhance the Electrochemical Reduction of Carbon Dioxide to C2 Products

Ultra‐thin Pd and CuPd Bimetallic Alloy Nanosheets for Electrochemical Reduction of CO₂

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Dendritic Ag/Pd Alloy Nanostructure Arrays for Electrochemical CO2 Reduction

Cited by 13 publications

References 39 publications

Enhanced Electrochemical Reduction of CO2to CO on Ag/SnO2by a Synergistic Effect of Morphology and Structural Defects

Enhanced Electrochemical Reduction of CO2to CO on Ag/SnO2by a Synergistic Effect of Morphology and Structural Defects

Core-Shell ZnO@Cu2O as Catalyst to Enhance the Electrochemical Reduction of Carbon Dioxide to C2 Products

Ultra‐thin Pd and CuPd Bimetallic Alloy Nanosheets for Electrochemical Reduction of CO2

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Product

Resources

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Dendritic Ag/Pd Alloy Nanostructure Arrays for Electrochemical CO₂ Reduction

Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Enhanced Electrochemical Reduction of CO₂to CO on Ag/SnO₂by a Synergistic Effect of Morphology and Structural Defects

Ultra‐thin Pd and CuPd Bimetallic Alloy Nanosheets for Electrochemical Reduction of CO₂