Journal of Inorganic Materials, Volume. 37, Issue 10, 1093(2022)

BiZnx/Si Photocathode: Preparation and CO2 Reduction Performance

Chengjin LI1...2, Yi XUE1,2, Xiaoxia ZHOU2,* and Hangrong CHEN2 |Show fewer author(s)
Author Affiliations
  • 11. School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 22. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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    Figures & Tables(24)
    Schematic diagram of the fabrication of BiZnx/Si photoelectrocathode and CO2 reduction process
    (a) Physical picture and (b) schematic model of photoelectrochemical cell for CO2 reduction
    SEM images of (a) planar-Si, (b) Si treated with NaOH solution, (c) Bi/Si, (d) BiZn1/Si, (e) BiZn2/Si, and (f) BiZn3/Si with (g-i) elemental mappings of BiZn2/Si
    (a) XRD patterns of Bi/Si, BiZn1/Si, BiZn2/Si, and BiZn3/Si, and (b) UV-Vis reflectivity spectra of Planar-Si, Si-T, Bi/Si, BiZn1/Si, BiZn2/Si and BiZn3/Si
    (a) High resolution Bi4f XPS spectra of Bi/Si, BiZn1/Si, BiZn2/Si and BiZn3/Si, (b) ratios of Bi3+/Bi0 for BiZn1/Si, BiZn2/Si, and BiZn3/Si, and (c) high resolution Zn2p XPS spectrum for BiZn2/Si
    (a) Transient photocurrent curves of Si-T, Bi/Si, BiZn1/Si, BiZn2/Si, and BiZn3/Si, (b) LSV curves of untreated Si (Planar Si), Si-T, Bi/Si, and BiZn2/Si in Ar or CO2-saturated 0.5 mol·L-1 KHCO3 aqueous solution, (c) FE histograms of CO2 reduction productions and (d) HCOOH current densities for Bi/Si, BiZn1/Si, BiZn2/Si, and BiZn3/Si, (e) electrochemical impedance spectra (EIS) of Si-T, Bi/Si and BiZn2/Si, and (f) stability of BiZn2/Si during 10 h test
    PEC and EC CO2 reduction performances of BiZn2/Si
    (a) ECSA lines of Bi/Si, BiZn1/Si, BiZn2/Si, and BiZn3/Si, and (b) oxidation LSV curves of PEC and EC CO2 reduction for BiZn2/Si in 0.1 mol·L-1 KOH aqueous solution
    Mechanismic schematic of formation process of HCOOH on the photocathode BiZn2/Si
    TEM and HRTEM images of (a-d) Bi/Si and (e-h) BiZn2/Si
    Elemental distribution mapping of BiZn2/Si
    i-t curves of (a) Bi/Si, (b) BiZn1/Si, (c) BiZn2/Si and (d) BiZn3/Si
    (a-c) Images of retention time H2, CO and O2, (d) H1 NMR spectrum of liquid product
    FE for PEC CO2 to CO, H2, HCOOH productions over BiZn2/Si, Bi/Si and Zn/Si
    1H NMR spectrum of the liquid phase products of BiZn2/Si in CO2-saturated 0.5 mol·L-1 KOH and Ar-saturated 0.5 mol·L-1 KHCO3 solutions for photoelechemical reduction of CO2
    (a) Photocurrent curves of BiZn2/Si, Bi/Si and Si-T, (b) PL spectra of BiZn2/Si, Bi/Si and Si-T
    Cycling stability runs of BiZn2/Si in CO2-saturated 0.5 mol·L-1 KHCO3 solution
    (a) XRD patterns of BiZn2/Si before and after stability test, (b) typical SEM image of BiZn2/Si after stability test
    CV curves for (a) Bi/Si, (b) BiZn1/Si, (c) BiZn2/Si and (d) BiZn3/Si at different scan rates
    LSV curves for BiZn1/Si, BiZn2/Si and BiZn3/Si
    FT-IR spectra of BiZn2/Si before and after photoelectrochemical CO2 reduction reaction
    Oxidation LSV curves of BiZn2/Si, Bi/Si and Si-T
    • Table 1. Bi/Zn molar ratios of different samples in ICP results

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      Table 1. Bi/Zn molar ratios of different samples in ICP results

      SampleBiZn1/Si BiZn2/Si BiZn3/Si
      (n)Bi/(n)Zn 14212088
    • Table 2. Faraday efficiency and current density comparison of different photo/electrocatalysts

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      Table 2. Faraday efficiency and current density comparison of different photo/electrocatalysts

      ElectrodeElectrolyteEapp/V Jtotal/(mA·cm-2) FEformateRef.
      Sn/SnOx0.5 mol·L-1 KHCO3-0.7 vs. RHE -2~38% PEC[1]
      SnO20.5 mol·L-1 NaOH -0.6 vs. RHE -3.567.6% EC[2]
      Sn foil0.5 mol·L-1 KHCO3-2.0 vs. SCE -2863.5% EC[3]
      Sn dendrite0.1 mol·L-1 KHCO3-1.36 vs. RHE -17.171.6% EC[4]
      Sn GDE0.5 mol·L-1 KHCO3-1. 8 vs. SCE -22.278.6% EC[5]
      2,2’-bpy-coordinated Cu0.5 mol·L-1 KHCO3-1.2 vs. RHE -1557.7% PEC[6]
      Si/Bi50.5 mol·L-1 KHCO3-1.03 vs. RHE -24.172.1% PEC[7]
      Bi-PMo nanosheets0.5 mol·L-1 NaHCO3-0.86 vs. RHE -3093% EC[8]
      Bi2O3 nanoparticle 0.5 mol·L-1 NaHCO3-1.2 vs. RHE -2291% EC[9]
      p-Si/Bi0.5 mol·L-1 NaHCO3-0.9 vs. RHE -1290% PEC[10]
      Bi nanoflakes0.1 mol·L-1 KHCO3-0.4 vs. RHE -79.5% EC[11]
      Cu25In750.5 mol·L-1 NaHCO3-0.7 vs. RHE -84.1% EC[12]
      In1.5Cu0.5 NPs 0.1 mol·L-1 KHCO3-1.2 vs. RHE -3.5990% EC[13]
      This work0.5 mol·L-1 KHCO3-0.8 vs. RHE -6.4596.1% PECThis work
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    Chengjin LI, Yi XUE, Xiaoxia ZHOU, Hangrong CHEN. BiZnx/Si Photocathode: Preparation and CO2 Reduction Performance [J]. Journal of Inorganic Materials, 2022, 37(10): 1093

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    Paper Information

    Category: RESEARCH ARTICLE

    Received: Jan. 17, 2022

    Accepted: --

    Published Online: Jan. 12, 2023

    The Author Email: ZHOU Xiaoxia (zhouxiaoxia@mail.sic.ac.cn)

    DOI:10.15541/jim20220027

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