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Fe-doped Co3O4 anchored on hollow carbon nanocages for efficient electrocatalytic oxygen evolution

LUO Jia-bing WANG Xing-zhao ZHANG Jun ZHOU Yan

罗佳冰, 王兴兆, 张军, 周炎. 锚定在中空碳纳米笼上的Fe掺杂Co3O4用于高效电催化析氧[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60080-X
引用本文: 罗佳冰, 王兴兆, 张军, 周炎. 锚定在中空碳纳米笼上的Fe掺杂Co3O4用于高效电催化析氧[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60080-X
LUO Jia-bing, WANG Xing-zhao, ZHANG Jun, ZHOU Yan. Fe-doped Co3O4 anchored on hollow carbon nanocages for efficient electrocatalytic oxygen evolution[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60080-X
Citation: LUO Jia-bing, WANG Xing-zhao, ZHANG Jun, ZHOU Yan. Fe-doped Co3O4 anchored on hollow carbon nanocages for efficient electrocatalytic oxygen evolution[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60080-X

锚定在中空碳纳米笼上的Fe掺杂Co3O4用于高效电催化析氧

doi: 10.1016/S1872-5813(22)60080-X
详细信息
  • 中图分类号: O643.32;

Fe-doped Co3O4 anchored on hollow carbon nanocages for efficient electrocatalytic oxygen evolution

Funds: This work was financially supported by the National Natural Science Foundation of China (No. 21805308), the Taishan Scholar Project of Shandong province, the Key Research and Development Program of Shandong Province (2019GSF109075), the Fundamental Research Funds for the Central Universities (19CX05001A).
More Information
  • 摘要: Co3O4中单金属有限的活性位点数量限制了其电催化活性。本文采用[Fe(CN)6]3-阴离子交换2-甲基咪唑再于空气气氛下退火衍生的策略,成功制备了一种负载在氮掺杂中空纳米笼碳骨架上的Fe掺杂Co3O4电催化剂(Fe-Co3O4/NC),用于电催化OER。XRD和HRTEM表征证实了Fe掺入Co3O4的晶格中。XPS表征明确了Fe引入后Co价态升高,这是基于Co2 + /Co3 + 和Fe3 + 的价电子构型诱导的电子由Co2 + /Co3 + 向Fe3 + 的转移,这会促使Co位点在OER过程中衍生为CoOOH活性物种,作为真正的电催化活性中心,这也被OER稳定性测试后的HRTEM和XPS表征所证实。电化学性能测试显示,该电催化剂的OER过电位仅有275 mV且能够在100 mA cm−2的电流密度下稳定维持20 h,兼具优异的电催化活性和稳定性,与20% Pt/C组成的两电极体系在自制膜电极装置中电催化全解水,仅需2.041 V施加电位即可实现100 mA cm−2的电流密度,具有工业应用前景。
  • 1  Diagram of the synthesis of Fe-Co3O4/NC electrocatalyst

    Figure  1  XRD patterns of (a) ZIF-67, (c) CoFe Precursor, (e) Co3O4 and Fe-Co3O4/NC-5/10/25; TEM images of (b) ZIF-67, (d) CoFe Precursor, (f) Fe-Co3O4/NC; HRTEM image of (g) Fe-Co3O4/NC; SAED pattern of (h) Fe-Co3O4/NC; SEM-Mapping (i) and corresponding EDS diagram (j) of Fe-Co3O4/NC

    Figure  2  TEM images of (a) Co3O4/NC, (b) Fe-Co3O4/NC-5, (c) Fe-Co3O4/NC, and (d) Fe-Co3O4/NC-25

    Figure  3  (a) XPS full spectrum of Fe-Co3O4/NC; XPS fine spectra of (b) Co 2p orbitals of Fe-Co3O4/NC and Co3O4/NC, (c) Fe 2p orbital of Fe-Co3O4/NC, and (d) O 1s orbitals of Fe-Co3O4/NC and Co3O4/NC

    Figure  4  OER performance characterization of samples, (a) LSV curves with iR-compensation; (b) corresponding Tafel curves; (c) Cdl fitting curves; (d) EIS impedance spectrums and insert plot is the equivalent circuit diagram; and (e) V-t stability curve of Fe-Co3O4/NC for electrocatalysis 20 h at a current density of 100 mA cm−2 and insert plot is the TEM image of Fe-Co3O4/NC after stability test

    Figure  5  CV curves of samples in the OER non-Faraday region (1.024−1.124 V vs. RHE)

    Figure  6  (a) HRTEM image of Fe-Co3O4/NC electrocatalyst after the OER stability test, XPS fine spectra of (b) Co 2p orbital; (c) Fe 2p orbital; and (d) O 1s orbital of Fe-Co3O4/NC before and after the OER stability test

    Figure  7  LSV curves with iR-compensation of Fe-Co3O4/NC-based samples with (a) various reaction temperatures and (b) various reaction time

    Figure  8  (a) schematic diagram of a self-made electrolytic water membrane electrode device; (b) LSV curves of NF‖NF, 20% Pt/C/NF‖RuO2/NF, 20% Pt/C/NF‖Fe-Co3O4/NC/NF, 20% Pt/C/NF‖Co3O4/NC/NF and (c) comparison bar chart of corresponding cell potential

    Table  1  Performance comparisons of Fe-Co3O4/NC with other reported advanced spinel-based OER electrocatalysts

    ElectrocatalystsElectrolyteCurrent / mA cm−2
    mA cm−2
    Overpotential / mVReferences
    Fe-Co3O4/NC1M KOH10275This Work
    FCO-Vo@NC1M KOH10318[19]
    Fe-Co3O41M KOH10280[20]
    VOB-Co3O4/NF1M KOH50315[21]
    FexCo3−xO41M KOH10295[22]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-09-01
  • 录用日期:  2022-10-09
  • 修回日期:  2022-09-27
  • 网络出版日期:  2022-12-26

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