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15 results on '"Wang, Yuxuan"'

3. Nano-folded Gold Catalysts for Electroreduction of Carbon Dioxide

Author

Kwok, Kam Sang, primary, Wang, Yuxuan, additional, Cao, Michael C., additional, Shen, Hao, additional, He, Zimin, additional, Poirier, Gerald, additional, McCandless, Brian E., additional, Livi, Kenneth J., additional, Muller, David A., additional, Wang, Chao, additional, and Gracias, David H., additional

Published
2019
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6. Copper Nanocubes for CO2Reduction in Gas Diffusion Electrodes

Author

Wang, Yuxuan, Shen, Hao, Livi, Ken J. T., Raciti, David, Zong, Han, Gregg, John, Onadeko, Mofopefoluwa, Wan, Yidong, Watson, Adam, and Wang, Chao

Abstract

Electroreduction of CO2represents a promising solution for addressing the global challenges in energy and sustainability. This reaction is highly sensitive to the surface structure of electrocatalysts and the local electrochemical environment. We have investigated the effect of Cu nanoparticle shape on the electrocatalysis of CO2reduction by using gas-diffusion electrodes (GDEs) and flowing alkaline catholytes. Cu nanocubes of ∼70 nm in edge length are synthesized with {100} facets preferentially exposed on the surface. They are demonstrated to possess substantially enhanced catalytic activity and selectivity for CO2reduction, compared to Cu nanospheres of similar particle sizes. The electrocatalytic performance was further found to be dependent on the concentration of electrolyte (KOH). The Cu nanocubes reach a Faradaic efficiency of 60% and a partial current density of 144 mA/cm2toward ethylene (C2H4) production, with the catalytic enhancement being attributable to a combination of surface structure and electrolyte alkalinity effects.

Published
2019
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14. Undercoordinated Active Sites on 4H Gold Nanostructures for CO 2 Reduction.

Author

Wang Y, Li C, Fan Z, Chen Y, Li X, Cao L, Wang C, Wang L, Su D, Zhang H, Mueller T, and Wang C

Abstract

Electroreduction of CO 2 is a promising approach toward artificial carbon recycling. The rate and product selectivity of this reaction are highly sensitive to the surface structures of electrocatalysts. We report here 4H Au nanostructures as advanced electrocatalysts for highly active and selective reduction of CO 2 to CO. Au nanoribbons in the pure 4H phase, Au nanorods in the hybrid 4H/fcc phase, and those in the fcc phase are comparatively studied for the electroreduction of CO 2 . Both the activity and selectivity for CO production were found to exhibit the trend 4H-nanoribbons > 4H/fcc-nanorods > fcc-nanorods, with the 4H-nanoribbons achieving >90% Faradaic efficiency toward CO. Electrochemical probing and cluster expansion simulations are combined to elucidate the surface structures of these nanocrystals. The combination of crystal phase and shape control gives rise to the preferential exposure of undercoordinated sites. Further density functional theory calculations confirm the high reactivity of such undercoordinated sites.

Published
2020
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15. Copper Nanocubes for CO 2 Reduction in Gas Diffusion Electrodes.

Author

Wang Y, Shen H, Livi KJT, Raciti D, Zong H, Gregg J, Onadeko M, Wan Y, Watson A, and Wang C

Abstract

Electroreduction of CO 2 represents a promising solution for addressing the global challenges in energy and sustainability. This reaction is highly sensitive to the surface structure of electrocatalysts and the local electrochemical environment. We have investigated the effect of Cu nanoparticle shape on the electrocatalysis of CO 2 reduction by using gas-diffusion electrodes (GDEs) and flowing alkaline catholytes. Cu nanocubes of ∼70 nm in edge length are synthesized with {100} facets preferentially exposed on the surface. They are demonstrated to possess substantially enhanced catalytic activity and selectivity for CO 2 reduction, compared to Cu nanospheres of similar particle sizes. The electrocatalytic performance was further found to be dependent on the concentration of electrolyte (KOH). The Cu nanocubes reach a Faradaic efficiency of 60% and a partial current density of 144 mA/cm 2 toward ethylene (C 2 H 4 ) production, with the catalytic enhancement being attributable to a combination of surface structure and electrolyte alkalinity effects.

Published
2019
Full Text
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