Synthesis and Supercapacitor Performance of Histidine-functionalized Carbon Dots/Graphene Aerogel

doi:10.15541/jim20190630

Abstract

Abstract:

Histidine-functionalized carbon dot/graphene aerogel (His-CDs/GA) were synthesized via the one-step hydrothermal method. The as-prepared His-CDs/GA exhibits unique three-dimensional porous structure, rich nitrogen and oxygen-containing functional groups, which facilitate the rapid diffusion of electrolyte ions and provide more active sites. When the mass ratio of GO and His-CDs is 2 : 1, the specific capacitance of His-CDs/GA-2 reaches 304 F·g ^-1 at a current density of 1 A·g ^-1, which increases 76.7% compared with that of GA (172 F·g ^- ¹). With the current density increasing from 1 A·g ^-1 to 50 A·g ^-1, the specific capacitance retention of His-CDs/GA-2 achieves 71.4%. The specific capacitance of His-CDs/GA-2 still remains 93.5% over 30000 cycles at 10 A·g ^-1. In addition, a symmetrical supercapacitor assembled by His-CDs/GA possesses a high energy density of 10.14 Wh/kg at a power density of 250 W/kg, and good cyclic performance with 88.4% capacitance retention at 5 A·g ^-1 over 20000 cycles. The results show that His-CDs/GA is a promising electrode material for supercapacitors.

Key words: graphene aerogel, histidine-functionalized carbon dot, capacitance performance, supercapacitor

CLC Number:

O646

DING Zhuofeng, YANG Yongqiang, LI Zaijun. Synthesis and Supercapacitor Performance of Histidine-functionalized Carbon Dots/Graphene Aerogel[J]. Journal of Inorganic Materials, 2020, 35(10): 1130-1136.

Figures/Tables 17

Fig. 1 Schematic illustration of His-CDs/GA preparation

Fig. 2 TEM image of His-CDs (Inset: HRTEM image)

Fig. 3 SEM images of GA(a), His-CDs/GA-1(b), His-CDs/ GA-2(c), and His-CDs/GA-3(d), and TEM images of GA(e) and His-CDs/GA-2(f)

Fig. 4 XRD patterns of GA, His-CDs/GA-1, His-CDs/GA-2 and His-CDs/GA-3

Fig. 5 Total survey XPS spectra (a) of GA and His-CDs/GA-2 and N 1s spectrum (b) of His-CDs/GA-2

Fig. 6 CV curves (a) at 10 mV·s-1 and GCD curves (b) at 1 A·g-1 of GA, His-CDs/GA-1, His-CDs/GA-2, and His-CDs/ GA-3

Fig. 7 CV curves at different scan rates (a) and GCD curves at different current densities (b) of His-CDs/GA-2; Rate capabilities of GA, His-CDs/GA-1, His-CDs/GA-2 and His-CDs/GA-3 (c); Cycling performances of GA and His-CDs/GA-2 at 10 A·g-1 (d)

Fig. 8 Ragon plots of His-CDs/GA-2//His-CDs/GA-2

Fig. S1 Size distribution of His-CDs

Fig. S2 XRD pattern (a) and IR spectrum (b) of His-CDs

Fig. S3 Raman spectra of GA, His-CDs/GA-1, His-CDs/GA-2 and His-CDs/GA-3

Fig. S4 N2 absorption-desorption isotherms (a) and pore size distributions (b) of GA, His-CDs/GA-1, His-CDs/GA-2 and His-CDs/GA-3

Fig. S5 C1s (a) and O1s (b) XPS spectra of His-CDs/GA-2

Table S1 Comparison of the specific capacitance of His-CDs/GA-2 and other graphene-based electrodes

Electrode	Specific capacitance/ (F·g^-1)	Current density/ (A·g^-1)	Ref.
RGO/CD	278	0.2	[1]
N-OMCN@GN	242.3	1	[2]
N/S-rGAs	180.5	1	[3]
GQDs-3DG	268	1.25	[4]
GQD/3DG	242	1.17	[5]
3D graphene layers	231.2	1	[6]
3D bubble-like graphene frameworks	277	1	[7]
His-CDs/GA-2	304	1	This work

Fig. S6 AC impedance plots of 4 electrodes with inset showing the equivalent ciruit from the EIS measurements

Fig. S7 CV curves (a) at different scan rates and GCD curves (b) at different current densities of His-CDs/GA-2//His-CDs/ GA-2 symmetrical supercapacitor

Fig. S8 Cycling performance at 5 A·g-1 over 20000 cycles of His-CDs/GA-2//His-CDs/GA-2 symmetrical supercapacitor

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