Lanthanum-supported Porous Carbon Composite Electrode Material Prepared by Rice Husk Char

doi:10.7503/cjcu20240012

Abstract

Abstract:

In this paper， a high value-added utilization method of rice husk char was proposed to prepare lanthanum-supported porous carbon composite electrode materials（La/PCs）. A series of La/PCs were prepared via in situ activation/loading method. The effects of calcination temperature and impregnation ratio on the adsorption and electrochemical properties of La/PCs were investigated. X-Ray diffraction（XRD）， X-ray photoelectron spectroscopy（XPS）， scanning electron microscope-energy dispersive spectrometer（SEM-EDS） and Brunauer-Emmett-Teller surface area（BET） were used to study the metal structure， valence state， element compositions and surface morphology of those La/PCs. It was analyzed that the possible relationship between pore structure and capacitance value. As a result， the La/PC_900/10 exhibited high gravimetric capacitance of 269.45 F/g in 6 mol/L KOH electrolyte. At 0.5 A/g， the assembled symmetric supercapacitor presented a superior gravimetric energy density of 23.45 W·h/kg at 0.70 kW/kg and the capacitance retention rate was 86.41% after 5000 cycles. The favorable capacitive behavior of La/PC_900/10 demonstrated its potential as carbon-based electrode applied in high performance supercapacitors. This paper provides a feasible path for the utilization of rice husk char and the application of lanthanum in the field of new energy materials.

Key words: Rice husk char, Lanthanum-supported porous carbon, Composite electrode

CLC Number:

O614

TrendMD:

SUI Guanghui, CHENG Yanyan. Lanthanum-supported Porous Carbon Composite Electrode Material Prepared by Rice Husk Char[J]. Chem. J. Chinese Universities, 2024, 45(4): 20240012.

Figures/Tables 9

References 32

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Sample	S_BET/（m²·g^‒1）	V_total/（cm³·g^‒1）	V_micro/（cm³·g^‒1）	V_micro/V_total（%）	D^*/nm
PC	1538.8	0.787603	0.487374	61.9	2.43
La/PC_900/10	1598.5	0.945414	0.304874	32.2	2.78
La/PC_900/20	1331.4	0.779032	0.278093	35.7	2.77
La/PC_900/30	1582.5	0.897300	0.351394	39.2	2.65
La/PC_800/10	1654.4	0.876647	0.353218	40.3	2.86
La/PC_800/20	1845.6	1.043793	0.286905	27.5	2.57
La/PC_800/30	1415.6	0.726327	0.316986	43.6	3.20
La/PC_700/10	1433.2	0.743373	0.327017	44.0	2.75
La/PC_700/20	1458.5	0.756058	0.336091	44.5	2.99
La/PC_700/30	1717.2	0.597704	0.273657	45.8	3.03

Sample	S_BET/（m²·g^‒1）	V_total/（cm³·g^‒1）	V_micro/（cm³·g^‒1）	V_micro/V_total（%）	D^*/nm
PC	1538.8	0.787603	0.487374	61.9	2.43
La/PC_900/10	1598.5	0.945414	0.304874	32.2	2.78
La/PC_900/20	1331.4	0.779032	0.278093	35.7	2.77
La/PC_900/30	1582.5	0.897300	0.351394	39.2	2.65
La/PC_800/10	1654.4	0.876647	0.353218	40.3	2.86
La/PC_800/20	1845.6	1.043793	0.286905	27.5	2.57
La/PC_800/30	1415.6	0.726327	0.316986	43.6	3.20
La/PC_700/10	1433.2	0.743373	0.327017	44.0	2.75
La/PC_700/20	1458.5	0.756058	0.336091	44.5	2.99
La/PC_700/30	1717.2	0.597704	0.273657	45.8	3.03

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