Sharp Cu@Sn nanocones on Cu foam for highly selective and efficient electrochemical reduction of CO<sub>2</sub> to formate

Chen, Chengzhen; Pang, Yuanjie; Zhang, Fanghua; Zhong, Ju Hua; Zhang, Bo; Cheng, Zhenmin

doi:10.1039/c8ta06826g

Cited by 80 publications

(59 citation statements)

References 47 publications

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“…The excellent performance was attributed to the abundant copper/tin dioxide interfaces. The spiky Cu@Sn nanocones by electrochemical coating showed the FE of 90.4 % toward formate, which should be attributed to the sharp conical structure that can enrich the surface‐adsorbed metal cations and promote the mass transfer . By tuning the phase and the structure of CuSn catalysts, the FE of nearly 100 % for formate and 91.4 % for CO could even achieve by fabricated a 3D core‐shell porous‐structured Cu@Sn hybrid electrode and Cu@Sn core‐shell nanowire arrays, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The spiky Cu@Sn nanocones by electrochemical coating showed the FE of 90.4 % toward formate, which should be attributed to the sharp conical structure that can enrich the surface-adsorbed metal cations and promote the mass transfer. [21] By tuning the phase and the structure of CuSn catalysts, the FE of nearly 100 % for formate and 91.4 % for CO could even achieve by fabricated a 3D core-shell porousstructured Cu@Sn hybrid electrode [22] and Cu@Sn core-shell nanowire arrays, [23] respectively. It can be seen that the electrocatalytic performances of CuSn alloy catalysts can be affected largely by their composition, morphology and structure.…”

Section: Introductionmentioning

confidence: 99%

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CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

et al. 2019

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We report an efficient electrocatalyst utilizing non‐noble metals consisting of Cu and Sn supported on nitrogen‐doped graphene (NG) for reduction of CO2 over a wide potential range. The CuSn alloy nanoparticles (NPs) on NG were prepared through a hydrothermal method followed by pyrolysis under nitrogen atmosphere to achieve a uniform dispersion of the alloy NPs. The CuSn NP (Cu/Sn ratio of 0.175) decorated NG catalyst performed electrocatalytic reduction of CO2 into C1 products at a Faradaic efficiency (FE) of nearly 93 % at an overpotential of −1.0 V vs. RHE, considerably higher than that of the Cu and Sn counterparts, i. e., 32 % and 58 %, respectively. The enhanced catalytic activity could be attributed to the collaboration between the CuSn alloy and Sn metal. The first‐principles density functional theory (DFT) simulation results indicate that the CuSn bimetal alloy nanoparticles enable more H atoms to participate in the electrocatalytic reduction of CO2 and exhibit an improved CO2 capture performance. In addition, the CuSn alloy having a lower barrier than that of Sn metal can accelerate the CO2 reduction process. This study presents the strategy that utilizes low‐cost non‐noble metals as highly efficient electrocatalysts for aqueous reduction of CO2.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

et al. 2019

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“…Various non‐noble metals (for example, Sn, In, Bi, Cd, Zn, and Co) have been investigated as catalysts for selectively reducing CO 2 to C 1 products . Among these materials, Sn is the most attractive catalyst owing to its high activity and stability towards C 1 production . Besides, Cu‐based catalysts are also able to catalyze CO 2 RR to C 1 products .…”

Section: Introductionmentioning

confidence: 99%

In Situ Reconstruction of a Hierarchical Sn‐Cu/SnO_xCore/Shell Catalyst for High‐Performance CO₂Electroreduction

et al. 2020

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The electrochemical CO2 reduction reaction (CO2RR) to give C1 (formate and CO) products is one of the most techno‐economically achievable strategies for alleviating CO2 emissions. Now, it is demonstrated that the SnOx shell in Sn2.7Cu catalyst with a hierarchical Sn‐Cu core can be reconstructed in situ under cathodic potentials of CO2RR. The resulting Sn2.7Cu catalyst achieves a high current density of 406.7±14.4 mA cm−2 with C1 Faradaic efficiency of 98.0±0.9 % at −0.70 V vs. RHE, and remains stable at 243.1±19.2 mA cm−2 with a C1 Faradaic efficiency of 99.0±0.5 % for 40 h at −0.55 V vs. RHE. DFT calculations indicate that the reconstructed Sn/SnOx interface facilitates formic acid production by optimizing binding of the reaction intermediate HCOO* while promotes Faradaic efficiency of C1 products by suppressing the competitive hydrogen evolution reaction, resulting in high Faradaic efficiency, current density, and stability of CO2RR at low overpotentials.

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“…Recently, a Sn-Cu electrode consisting of dendritic Cu core and a partially reduced oxides CuOx/SnOx shell also achieved excellent FE CO with a maximum of 94% due to the sparse Sn specie [18]. In contrast, some Sn-Cu electrodes generate formate as the dominant product [19][20][21][22][23]. For example, an electrode with spiky Cu@Sn nanocones over Cu foam exhibits an outstanding FE HCOOH of 90.4%.…”

Section: Introductionmentioning

confidence: 99%

Tuning Sn-Cu Catalysis for Electrochemical Reduction of CO2 on Partially Reduced Oxides SnOx-CuOx-Modified Cu Electrodes

Zhang

et al. 2019

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Copper-based bimetallic catalysts have been recently showing promising performance for the selective electrochemical reduction of CO2. In this work, we successfully fabricated the partially reduced oxides SnOx, CuOxmodified Cu foam electrode (A-Cu/SnO2) through an electrodeposition-annealing-electroreduction approach. Notably, in comparison with the control electrode (Cu/SnO2) without undergoing annealing step, A-Cu/SnO2 exhibits a significant enhancement in terms of CO2 reduction activity and CO selectivity. By investigating the effect of the amount of the electrodeposited SnO2, it is found that A-Cu/SnO2 electrodes present the characteristic Sn-Cu synergistic catalysis with a feature of dominant CO formation (CO faradaic efficiency, 70~75%), the least HCOOH formation (HCOOH faradaic efficiency, <5%) and the remarkable inhibition of hydrogen evolution reaction. In contrast, Cu/SnO2 electrodes exhibit a SnO2 coverage-dependent catalysis—a shift from CO selectivity to HCOOH selectivity with the increasing deposited SnO2 on Cu foam. The different catalytic performance between Cu/SnO2 and A-Cu/SnO2 might be attributed to the different content of Cu atoms in SnO2 layer, which may affect the density of Cu-Sn interface on the surface. Our work provides a facile annealing-electroreduction strategy to modify the surface composition for understanding the metal effect towards CO2 reduction activity and selectivity for bimetallic Cu-based electrocatalysts.

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Sharp Cu@Sn nanocones on Cu foam for highly selective and efficient electrochemical reduction of CO₂ to formate

Abstract: Electrochemical reduction of aqueous CO2 into formate is subject to poor selectivity and low current density with conventional Sn-based catalysts owing to the inert nature of CO2 molecules and the low number of active sites.

Cited by 80 publications

References 47 publications

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

In Situ Reconstruction of a Hierarchical Sn‐Cu/SnO_xCore/Shell Catalyst for High‐Performance CO₂Electroreduction

Tuning Sn-Cu Catalysis for Electrochemical Reduction of CO2 on Partially Reduced Oxides SnOx-CuOx-Modified Cu Electrodes

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Sharp Cu@Sn nanocones on Cu foam for highly selective and efficient electrochemical reduction of CO2 to formate

Abstract: Electrochemical reduction of aqueous CO2 into formate is subject to poor selectivity and low current density with conventional Sn-based catalysts owing to the inert nature of CO2 molecules and the low number of active sites.

Cited by 80 publications

References 47 publications

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO2 Reduction

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO2 Reduction

In Situ Reconstruction of a Hierarchical Sn‐Cu/SnOxCore/Shell Catalyst for High‐Performance CO2Electroreduction

Tuning Sn-Cu Catalysis for Electrochemical Reduction of CO2 on Partially Reduced Oxides SnOx-CuOx-Modified Cu Electrodes

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Sharp Cu@Sn nanocones on Cu foam for highly selective and efficient electrochemical reduction of CO₂ to formate

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO₂ Reduction

In Situ Reconstruction of a Hierarchical Sn‐Cu/SnO_xCore/Shell Catalyst for High‐Performance CO₂Electroreduction