Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (2): 213-220.DOI: 10.15541/jim20170305
Special Issue: 电催化研究; 乘风破浪的新能源材料
• Orginal Article • Previous Articles Next Articles
CUI Xiang-Zhi1, ZHANG Lin-Lin1, ZENG Li-Ming1,2, ZHANG Xiao-Hua1,2, CHEN Hang-Rong1, SHI Jian-Lin1
Received:
2017-06-21
Revised:
2017-10-12
Published:
2018-02-26
Online:
2018-01-26
Supported by:
CLC Number:
CUI Xiang-Zhi, ZHANG Lin-Lin, ZENG Li-Ming, ZHANG Xiao-Hua, CHEN Hang-Rong, SHI Jian-Lin. Fabrication of Tungsten Carbide Nanoparticle-encased Graphite-like Mesoporous Carbon as a Precious Metal-free Electrocatalyst for Oxygen Reduction[J]. Journal of Inorganic Materials, 2018, 33(2): 213-220.
Fig. 1 (a) Wide-angle XRD patterns of the prepared samples with inset showing the XRD pattern (2θ =20°-30°) of WC/MG- 900, and (b) the corresponding small-angle XRD patterns
Fig. 2 SEM images of sample WC/MG-800 (a), WC/MG-900 (b) and (e), and WC/MG-1000 (c); EDX pattern of WC/MG-900 (d) and its corresponding element mappings (e-1) and (e-2)
Fig. 3 TEM images of sample WC/MG-800 (a), WC/MG-900 (b), and WC/MG-1000 (c); HRTEM images (b-1, b-2) of the squared area in Fig.3(b) with the inset showing the squared area in (b-1)
Fig. 6 (a) Current-voltage curves of different samples in 0.1 mol/L KOH solutions; (b) Current density vs. cycling times histograms; (c) LSV curves of samples at a rotating rate of 1600 r/min; (d) LSV curves of sample WC/MG-900 at varied rotating rates and the corresponding K-L plots in the inset; (e) Ring-disc current density curves; (f) Electron transfer number curve
Sample | SBET[a]/ (m2•g-1) | DBJH[b]/ nm | VBJH[c]/ (cm3•g-1) | JL[d]/ (mA•cm-2) | n[e] |
---|---|---|---|---|---|
SBA-15 | 738 | 7.5 | 1.36 | - | - |
WC | 98 | 9.2 | 0.13 | 3.6 | 3.2 |
WC/MG-800 | 113 | 5.8 | 0.23 | 3.8 | 3.4 |
WC/MG-900 | 118 | 6.4 | 0.25 | 4.5 | 3.7 |
WC/MG-1000 | 124 | 8.4 | 0.34 | 4.6 | 3.5 |
20wt%Pt/C | 185 | - | - | 4.7 | 3.9 |
Table 1 Pore structural parameters and electron-transfer number of prepared composites
Sample | SBET[a]/ (m2•g-1) | DBJH[b]/ nm | VBJH[c]/ (cm3•g-1) | JL[d]/ (mA•cm-2) | n[e] |
---|---|---|---|---|---|
SBA-15 | 738 | 7.5 | 1.36 | - | - |
WC | 98 | 9.2 | 0.13 | 3.6 | 3.2 |
WC/MG-800 | 113 | 5.8 | 0.23 | 3.8 | 3.4 |
WC/MG-900 | 118 | 6.4 | 0.25 | 4.5 | 3.7 |
WC/MG-1000 | 124 | 8.4 | 0.34 | 4.6 | 3.5 |
20wt%Pt/C | 185 | - | - | 4.7 | 3.9 |
Fig. 7 Chronoamperometric responses of samples at 0.75 V (vs. RHE) in O2-saturated (a) 0.1 mol/L KOH solution, and (b) 0.1 mol/L KOH with 3 mol/L CH3OH solution added at ca.5 min
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