Effect of V Doping on Electrocatalytic Performance of Ni-Co-S on Bacterial Cellulose-derived Carbon Aerogel

doi:10.15541/jim20200011

Abstract

Abstract:

Ni-Co-S/CA composite aerogels were prepared by hydrothermal method using bacterial cellulose-derived carbon aerogels (CA) as support. The microstructure and properties of the composites were adjusted via adding trace vanadium. The characterization results show that the main phase of Ni-Co-S is NiCo₂S₄with the secondary phase of NiS₂. With the increment of the nickel-cobalt salt concentration, the load amount increases, and the peak current density of electrocatalysis firstly upgraded and then degraded. After being doped with a small amount of vanadium at lower nickel-cobalt salt concentration, Ni-Co-S transforms from spherical particles with high crystallinity to square particles with low crystallinity, and its electrocatalytic activity and stability are improved. Under the preparative conditions of 0.01 mol/L total concentration of nickel-cobalt salt and 3mol% vanadium salt, the as-obtained electrode exhibits the optimal catalytic performance for methanol oxidation. Compared with the sample without V doping, its peak current density (78.1 mA/cm ²) enhanced by 45.7% at least. The Ni-Co-S/CA composite aerogel electrodes with the advantages of light weight and high porosity, is expected to be applied in portable direct methanol fuel cell.

Key words: bacterial cellulose, carbon aerogel, Ni-Co-S, vanadium doping, methanol oxidation

CLC Number:

TQ174

LYU Ziye, TANG Yiping, CAO Huazhen, ZHENG Guoqu, HOU Guangya. Effect of V Doping on Electrocatalytic Performance of Ni-Co-S on Bacterial Cellulose-derived Carbon Aerogel[J]. Journal of Inorganic Materials, 2020, 35(10): 1142-1148.

Figures/Tables 6

Fig. 1 (a) XRD patterns of CA, NCS-2, NCS-10 and V3-NCS-1 samples; (b) Total survey, (c) Ni2p, (d) Co2p and (e) S2p XPS spectra of NCS-2

Fig. 2 SEM images of (a) carbon aerogels, (b) NCS-1, (c, d) NCS-2, (e) NCS-5 and (f) NCS-10

Fig. 3 (a-b) High-resolution TEM image, (b) HAADF-STEM image and (c) EDS element mappings of NCS-2

Fig. 4 SEM images of (a) NCS-1 and Vx-NCS-1 (x is (b)3, (c)5 or (d)10)

Fig. 5 (a) CV curves of CA, NCS-n (n=1, 2, 5, 10) and V3-NCS-n (n=1,2); (b) Comparison of the peak current density and the average load amount of NCS-n (n=1, 2), Vx-NCS-n (x=3, 5, 10; n=1,2); (c) CV curves of V3-NCS-1 in 1 mol/L KOH at 10, 20, 30, 40, 50 mV/s sweep speed with inset showing the relationship between the peak current density and the square root of the sweep speed; (d) Relationship between the methanol concentration and the peak current density of V3-NCS-1

Fig. 6 (a) Oxidation peak current densities and (b) I-t curves of NCS-2 and V3-NCS-1 electrodes varied within 1000 CV cycles, and (c) XRD patterns of NCS-2 and V3-NCS-1 before and after 1000 cycles; (d) TEM image, (e) HAADF-STEM image and corresponding EDS element mappings of the particles loaded in NCS-2 after 1000 cycles

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