RETRACTED ARTICLE: Colloidal silver diphosphide (AgP2) nanocrystals as low overpotential catalysts for CO2 reduction to tunable syngas

Li, Hui; Wen, Peng; Itanze, Dominique S.; Hood, Zachary D.; Ma, Xiao; Kim, Michael; Adhikari, Sushovit; Lü, Chang; Dun, Chaochao; Qiu, Yejun; Geyer, Scott M.

doi:10.1038/s41467-019-13388-8

Cited by 87 publications

(83 citation statements)

References 63 publications

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“…It is noted that the fitting path length was up to ~6 Å for Ag-D after 6, 8 and 10 min. The fitting results of the bond lengths and coordination number (CN) were reasonable and consistent with previous reports 52 , 54 . As shown in Fig.…”

Section: Resultssupporting

confidence: 91%

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Fast operando spectroscopy tracking in situ generation of rich defects in silver nanocrystals for highly selective electrochemical CO2 reduction

Guo

Sun

et al. 2021

Nat Commun

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Electrochemical CO2 reduction (ECR) is highly attractive to curb global warming. The knowledge on the evolution of catalysts and identification of active sites during the reaction is important, but still limited. Here, we report an efficient catalyst (Ag-D) with suitable defect concentration operando formed during ECR within several minutes. Utilizing the powerful fast operando X-ray absorption spectroscopy, the evolving electronic and crystal structures are unraveled under ECR condition. The catalyst exhibits a ~100% faradaic efficiency and negligible performance degradation over a 120-hour test at a moderate overpotential of 0.7 V in an H-cell reactor and a current density of ~180 mA cm−2 at −1.0 V vs. reversible hydrogen electrode in a flow-cell reactor. Density functional theory calculations indicate that the adsorption of intermediate COOH could be enhanced and the free energy of the reaction pathways could be optimized by an appropriate defect concentration, rationalizing the experimental observation.

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Section: Resultssupporting

confidence: 91%

“…The peak intensity of the Ag–Ag bond for Ag-D reached a stable value (~1.19) after 11 min. However, this value was less than the peak intensity of the Ag–Ag bond for the Ag foil reference (~1.33), indicating a possibly lower coordination number of Ag atoms in the Ag-D catalyst 32 , 54 , 55 .…”

Section: Resultsmentioning

confidence: 75%

Fast operando spectroscopy tracking in situ generation of rich defects in silver nanocrystals for highly selective electrochemical CO2 reduction

Guo

Sun

et al. 2021

Nat Commun

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“…Other promising active electrocatalytic systems incorporate Ag metal centers or Ag electrodes. 47,63,[144][145][146][147] Compared to Au electrocatalysts, Ag catalyst are cheaper and have comparable activity.…”

Section: Heterogeneous Amine Molecular Catalysts and Electrochemical mentioning

confidence: 99%

Homogeneous and heterogeneous molecular catalysts for electrochemical reduction of carbon dioxide

2020

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“…Solid metallic catalysts have exhibited excellent performance for electrocatalytic or photocatalytic CO 2 reduction [15][16][17] . However, the active sites of solid metallic catalysts can deteriorate under intense mechanical stimuli and/or can be deactivated when carbonaceous materials adhere onto the catalytic sites during CO 2 reduction.…”

Section: Main Textmentioning

confidence: 99%

Mechanical energy-induced CO2 conversion using liquid metals

Tang¹,

Tang²,

Mayyas³

et al. 2020

Preprint

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We report a green carbon capture and conversion technology offering scalability and economic viability for mitigating CO2 emissions. The technology uses suspensions of gallium liquid metal to reduce CO2 into carbonaceous solid products and O2 at near room temperature. The nonpolar nature of the liquid gallium interface allows the solid products to instantaneously exfoliate, hence keeping active sites accessible. The solid co-contributor of silver-gallium rods ensures a cyclic sustainable process. The overall process relies on mechanical energy as the input, which drives nano dimensional triboelectrochemical reactions. By altering the secondary solvent and changing the reactor height, the dissolution and conversion efficiency can be tuned. The optimum reactor height is only 27 cm, when gallium/silver fluoride mix at 7:1 mass ratio is employed as the reaction material. At CO2 input of ~8 sccm, 92% efficiency was obtained at the record low input energy of 228.5 kW∙h for the capture and conversion of a tonne of CO2. The potential impact of this green technology is remarkable, likely benefiting a variety of industries and offering an economical solution for CO2 capture and conversion.

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RETRACTED ARTICLE: Colloidal silver diphosphide (AgP2) nanocrystals as low overpotential catalysts for CO2 reduction to tunable syngas

Cited by 87 publications

References 63 publications

Fast operando spectroscopy tracking in situ generation of rich defects in silver nanocrystals for highly selective electrochemical CO2 reduction

Fast operando spectroscopy tracking in situ generation of rich defects in silver nanocrystals for highly selective electrochemical CO2 reduction

Homogeneous and heterogeneous molecular catalysts for electrochemical reduction of carbon dioxide

Mechanical energy-induced CO2 conversion using liquid metals

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