Influence of N/S Co-doping on Electrochemical Property of Brucite Template Carbon Nanotubes

doi:10.15541/jim20200033

Abstract

Abstract:

N/S doped carbon nanotubes were prepared with natural mineral fibrous brucite as template, sucrose as carbon source, and thiourea as nitrogen and sulfur source. Experimental results indicate that the doped carbon nanotubes inherit the one-dimensional columnar structure of the fibrous brucite template. In addition, it presents a hollow tubular structure, which increases the specific surface area and pore volume of the template carbon. In 6 mol·L^-1 KOH electrolyte, the electrochemical performance significantly improves after doping. CNT-N/S presents a high specific capacity of 172.0 F·g^-1 at current density of 1 A·g^-1, higher than those of CNT (62.2 F·g^-1) and CNT-N (97.0 F·g^-1). The capacitance of the N/S doped carbon nanotubes remains 89% after 1000 charge-discharge cycles. Furthermore, the assembled symmetrical supercapacitor also shows good capacitance performance.

Key words: supercapacitor, brucite, N/S co-doping, carbon nanotube, electrochemical performance

CLC Number:

TQ127

LIU Fangfang, CHUAN Xiuyun, YANG Yang, LI Aijun. Influence of N/S Co-doping on Electrochemical Property of Brucite Template Carbon Nanotubes[J]. Journal of Inorganic Materials, 2021, 36(7): 711-717.

Figures/Tables 14

Fig. 1 XRD patterns of fibrous brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Fig. 2 Raman spectra of the fibrous brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Fig. 3 (a-d) SEM and (e-h) TEM images of (a, e) fibrous brucite, fibrous brucite templated carbon nanotube (b, f) CNT, (c, g) CNT-N, (d, h) CNT-N/S

Fig. 4 (a) Nitrogen adsorption-desorption isotherms and corresponding (b) BJH pore size distribution curves of the Fibrous Brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Table 1 Specific surface areas and pore structure parameters of fibrous brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Sample	S_BET/(m²∙g^-1)	S_micropore/(m²∙g^-1)	V_total/(cm³∙g^-1)	V_mircropore/(cm³∙g^-1)	D_ap/nm
CNT	505.5	273.5	0.381	0.125	3.02
CNT-N	245.1	131.3	0.213	0.060	3.48
CNT-N/S	224.8	63.8	0.267	0.028	4.75

Fig. 5 Fitting curves of (a) C1s, (b) N1s and (c) S2p for CNT-N/S

Fig. 6 (a) CV curves at 100 mV·s-1, (b) GCD curves at 1 A·g-1, (c) cycling performance at 1 A·g-1 of CNT, CNT-N and CNT-N/S

Fig. 7 (a) Specific capacitance versus current density, (b) cycling performance at 2 A·g-1 and (c) Nyquist plots of CNT//CNT, CNT-N//CNT-N and CNT-N/S//CNT-N/S with insert in (c) showing the corresponding enlarged view of the high frequency

Fig. S1 Schematic of preparation process for CNT-N/S

Fig. S2 XRD patterns of raw and dispersed Fibrous Brucite

Fig. S3 XPS spectra with the enlarged view of N1s peaks in the insert of Fibrous Brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Table S1 Elemental composition of Fibrous Brucite templated carbon nanotube CNT, CNT-N and CNT-N/S

Sample	C/at%	O/at%	N/at%	S/at%
CNT	87.34	12.66	-	-
CNT-N	84.93	13.62	1.45	-
CNT-N/S	89.68	8.15	0.74	1.43

Fig. S4 (a-c) CV curves at different scan rates and (d-f) GCD curves at different current densities of (a, d) CNT, (b, e) CNT-N and (c, f) CNT-N/S; (g) Nyquist plots of CNT, CNT-N and CNT-N/S with insert showing the corresponding equivalent circuit

Fig. S5 (a) Schematic structure of symmetric capacitor; (b-d) CV curves at different scan rates and (e-g) GCD curves at different current densities of (b, e) CNT//CNT, (c, f) CNT-N//CNT-N and (d, g) CNT-N/S//CNT-N/S

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