Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (12): 2275-2286.DOI: 10.1016/S1872-2067(21)63902-5
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Jiani Hua,†, Xiaofeng Zhanga,†, Juan Xiaob, Ruchun Lia, Yi Wangb, Shuqin Songa,*()
Received:
2021-02-05
Accepted:
2021-02-05
Online:
2021-12-18
Published:
2021-09-10
Contact:
Shuqin Song
About author:
* E-mail: stsssq@mail.sysu.edu.cn†Contributed equally.
Supported by:
Jiani Hu, Xiaofeng Zhang, Juan Xiao, Ruchun Li, Yi Wang, Shuqin Song. Template-free synthesis of Co3O4 microtubes for enhanced oxygen evolution reaction[J]. Chinese Journal of Catalysis, 2021, 42(12): 2275-2286.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63902-5
Fig. 1. (a) Schematic diagram of the fabrication process and architecture of precursors prepared via hydrothermal growth (I) using Co(Ac)2·4H2O, Ni(Ac)2·4H2O, 1,3-propanediol and absolute ethanol and precursors after pyrolysis at 400 °C in air (II); (b) XRD; (c) SEM; (d) TEM; (e) selected area electron diffraction pattern; (f) HRTEM; (g) STEM image; Co (h), Ni (i), and O (j) energy-dispersive X-ray spectroscopy mapping images of Ni-1/Co3O4-2-pro-9-Ac. Here, Ac and pro denote CH3COO- and 1,3-propanediol, respectively.
Fig. 3. (a) XRD patterns of Ni-1/Co3O4-2-pro-Y-Ac; SEM images of Ni-1/Co3O4-2-pro-0-Ac (b), Ni-1/Co3O4-2-pro-3-Ac (c), Ni-1/Co3O4-2-pro-6-Ac (d), Ni-1/Co3O4-2-pro-12-Ac (e), Ni-1/Co3O4-2-pro-15-Ac (f), and Ni-1/Co3O4-2-pro-50-Ac (g).
Fig. 4. XRD patterns (a-d) and SEM images (e-h) of Cu-1/Co3O4-2-pro-9-Ac (a,e), Fe-1/Co3O4-2-pro-9-Ac (b,f), Mn-1/Co3O4-2-pro-9-Ac (c,g), and Zn-1/Co3O4-2- pro-9-Ac (d,h).
Fig. 7. Polarization curves in 1 M KOH with iR correction (a,d,g,j,m), onset potentials and overpotentials at a current density of 10 mA cm-2 (b,e,h,k,n) and Tafel slopes (c,f,i,l,o) of Ni-1/Co3O4-2-N-9-Ac (a-c), Ni-1/Co3O4-2-pro-Y-Ac (d-f), M-1/Co3O4-2-pro-9-Ac (g-i), Ni-(3-X)/Co3O4-X-pro-9-Ac (j-l), and Ni-1/Co3O4-2-pro-9-A (m-o).
Fig. 8. (a) Schematic diagram of the fabrication process and P doping mechanism of Ni-1/Co3O4-2-pro-9-Ac; TEM image (b), selected area electron diffraction pattern (c), HRTEM image (d), STEM image (e), and Co (f), Ni (g), O (h) and P (i) energy-dispersive X-ray spectroscopy mapping images of P0.5-Ni-1/Co3O4-2-pro-9-Ac.
Fig. 10. (a) Polarization curves with iR correction; (b) Onset potential and overpotential at a current density of 10 mA cm-2; (c) Tafel slopes; (d) Nyquist plots at an applied potential of 1.52 V; (e) Cyclic voltammograms of P0.5-Ni-1/Co3O4-2-pro-9-Ac; (f) Electrochemical surface areas of Ni-1/Co3O4-2-pro-9-Ac, P0.5-Ni-1/Co3O4-2-pro-9-Ac, P3-Ni-1/Co3O4-2-pro-9-Ac, P5-Ni-1/Co3O4-2-pro-9-Ac in 1.0 M KOH.
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