Synthesis and Electrochemical Performance for Supercapacitors of Bi-doped α-MnO2 Nanorods

doi:10.7503/cjcu20170343

Abstract

Abstract:

Bi-doped α-MnO₂ nanorods were synthetized by a hydrothermal method. Their crystal structures and electrochemical performance were characterized by X-ray diffraction, X-ray photoelectron spectrometry, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results suggest that the bismuth element is doped into the crystal lattice of α-MnO₂. The electrochemical performance of Bi-doped α-MnO₂ is notably improved compared with that of pure α-MnO₂. The specific capacitance of Bi-doped α-MnO₂ nanorods can reach 265 F/g at a current density of 1 A/g, which is 1.05 times higher than that of no Bi-doped α-MnO₂ (129 F/g) synthesized under the same conditions. The capacity retention ratio of Bi-doped α-MnO₂ nanorods can reach 95% after 2000 cycles, higher than that of the no Bi-doped α-MnO₂ synthesized under the same conditions. Therefore, Bi doping is helpful to improve the performance of α-MnO₂ as electrode materials for supercapacitor.

Key words: Manganese dioxide nanorods, Supercapacitor, Bi-doping

CLC Number:

O646

TrendMD:

WANG Fengmei, XU Guangwei, JIN Chengchang. Synthesis and Electrochemical Performance for Supercapacitors of Bi-doped α-MnO₂ Nanorods[J]. Chem. J. Chinese Universities, 2018, 39(3): 530.

Figures/Tables 9

Fig.1 X-Ray diffraction patterns of samples(A) and magnified X-ray diffraction patterns of samples between the ranges of 2θ=25°—35°(B)a. MO; b. BMO-50; c. BMO-30; d. BMO-20.

Table 1 Lattice parameters and cell volumes of MO, BMO-50, BMO-30 and BMO-20

Sample	a/nm	c/nm	c/a	V/nm³
MO	0.98723	0.28707	0.2908	0.27981
BMO-50	0.98742	0.28689	0.2905	0.28021
BMO-30	0.98780	0.28685	0.2904	0.28032
BMO-20	0.98792	0.28669	0.2902	0.28065

Fig.2 Mn2p(A), Bi4f(B) and O1s(C) XPS spectra of MO(a), BMO-50(b), BMO-30(c) and BMO-20(d) and divided peaks of O1s of BMO-20(D)

Fig.3 SEM images of MO(A), BMO-50(B), BMO-30(C) and BMO-20(D)

Fig.4 Element mapping images of BMO-50(A) Bi element; (B) Mn element; (C) O element.

Fig.5 TEM(A—D) and HRTEM(A'—D') images of MO(A, A'), BMO-50(B, B'), BMO-30(C, C') and BMO-20(D, D')

Fig.6 CV curves of α-MnO2 and Bi-doped α-MnO2 at scan rate of 5 mV/s(A), BMO-20(B) and MO(C) at different scan rates and specific capacitances of α-MnO2 and Bi-doped α-MnO2 at different scan rates(D)a. MO; b. BMO-50; c. BMO-30; d. BMO-20.

Fig.7 Galvanostatic charge/discharge curves of α-MnO2 and Bi-doped α-MnO2(A) and cycle performance of α-MnO2 and Bi-doped α-MnO2(current density: 1 A/g)(B)a. MO; b. BMO-50; c. BMO-30; d. BMO-20.

Fig.8 Nyquist plots of α-MnO2 and Bi-doped α-MnO2a. MO; b. BMO-50; c. BMO-30; d. BMO-20.

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Synthesis and Electrochemical Performance for Supercapacitors of Bi-doped α-MnO₂ Nanorods

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