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RETRACTED ARTICLE: Colloidal silver diphosphide (AgP2) nanocrystals as low overpotential catalysts for CO2 reduction to tunable syngas

Author

Listed:
  • 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)
    Massachusetts Institute of Technology)

  • 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)

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.

Suggested Citation

  • Hui Li & Peng Wen & Dominique S. Itanze & Zachary D. Hood & Xiao Ma & Michael Kim & Shiba Adhikari & Chang Lu & Chaochao Dun & Miaofang Chi & Yejun Qiu & Scott M. Geyer, 2019. "RETRACTED ARTICLE: Colloidal silver diphosphide (AgP2) nanocrystals as low overpotential catalysts for CO2 reduction to tunable syngas," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13388-8
    DOI: 10.1038/s41467-019-13388-8
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    Cited by:

    1. Zhang, Yuwei & Zhang, Yingjie & Zhu, Hengxi & Zhou, Pengxiang & Liu, Shuai & Lei, Xiaoli & Li, Yanhong & Li, Bin & Ning, Ping, 2022. "Life cycle assessment of pollutants and emission reduction strategies based on the energy structure of the nonferrous metal industry in China," Energy, Elsevier, vol. 261(PA).
    2. Cai Wang & Xiaoyu Wang & Houan Ren & Yilin Zhang & Xiaomei Zhou & Jing Wang & Qingxin Guan & Yuping Liu & Wei Li, 2023. "Combining Fe nanoparticles and pyrrole-type Fe-N4 sites on less-oxygenated carbon supports for electrochemical CO2 reduction," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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