RETRACTED ARTICLE: Colloidal silver diphosphide (AgP2) nanocrystals as low overpotential catalysts for CO2 reduction to tunable syngas

Hui Li, Peng Wen, Dominique S. Itanze, Zachary D. Hood, Xiao Ma, Michael Kim, Shiba Adhikari, Chang Lu, Chaochao Dun, Miaofang Chi, Yejun Qiu () and Scott M. Geyer ()
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Hui Li: Wake Forest University
Peng Wen: Harbin Institute of Technology
Dominique S. Itanze: Wake Forest University
Zachary D. Hood: Oak Ridge National Laboratory (ORNL)
Xiao Ma: Wake Forest University
Michael Kim: Wake Forest University
Shiba Adhikari: Oak Ridge National Laboratory (ORNL)
Chang Lu: Wake Forest University
Chaochao Dun: University of Notre Dame
Miaofang Chi: Oak Ridge National Laboratory (ORNL)
Yejun Qiu: Harbin Institute of Technology
Scott M. Geyer: Wake Forest University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Production of syngas with tunable CO/H2 ratio from renewable resources is an ideal way to provide a carbon-neutral feedstock for liquid fuel production. Ag is a benchmark electrocatalysts for CO2-to-CO conversion but high overpotential limits the efficiency. We synthesize AgP2 nanocrystals (NCs) with a greater than 3-fold reduction in overpotential for electrochemical CO2-to-CO reduction compared to Ag and greatly enhanced stability. Density functional theory calculations reveal a significant energy barrier decrease in the formate intermediate formation step. In situ X-ray absorption spectroscopy (XAS) shows that a maximum Faradaic efficiency is achieved at an average silver valence state of +1.08 in AgP2 NCs. A photocathode consisting of a n+p-Si wafer coated with ultrathin Al2O3 and AgP2 NCs achieves an onset potential of 0.2 V vs. RHE for CO production and a partial photocurrent density for CO at −0.11 V vs. RHE (j−0.11, CO) of −3.2 mA cm−2.

Date: 2019
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DOI: 10.1038/s41467-019-13388-8

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