碱/尿素溶解体系制备氮掺杂活性炭及其电化学性能研究

doi:10.3969/j.issn.0253-2417.2021.02.002

Abstract

Abstract:

Nitrogen-doped activated carbon was fabricated by one-step pyrolysis with Chinese fir sawdust as raw material, melamine solid waste(oxhydryl and amino triazine, OAT) as nitrogen-rich source, alkali/urea system as solvent. The effects of activation temperatures and melamine solid waste dosage on adsorption performance and electrochemistry performance of activated carbon were investigated. X-ray photoelectron spectroscopy(XPS) and specific surface area analyzer were used to study the surface structure and pore structure of the material. Cyclicvoltammetry(CV) curves, galvanostatical charge/discharge(GCD) and electrochemical impedance spectroscopy(EIS) were used to test the electrochemical performance of samples. The results showed that with the increase of melamine solid waste content, the yield and adsorption performance of activated carbon samples increased first and then decreased; the addition of melamine solid waste was beneficial to increase the yield, nitrogen content, adsorption performance and electrochemical performance of nitrogen-doped activated carbon. The specific surface area and pore structure of carbon materials affected the electrochemical performance of activated carbon samples. When the activation temperature was 900 ℃ and the melamine solid waste content was 15%, the yield of nitrogen-doped activated carbon was 34.2%, the iodine adsorption value was 1 116 mg/g, and the methylene blue adsorption value was 165 mg/g, specific surface area was 1 324 m²/g, nitrogen content was 3.5%. In the 6 mol/L KOH electrolyte, the specific capacitance could reach 193 F/g when the current density was 1 A/g.

Key words: OAT, alkali/urea system, nitrogen-doped activated carbon, electrochemical performance

CLC Number:

Xuan YANG, Xinyu ZHENG, Jianhua LYU, Hao YING, Biao HUANG, Guanfeng LIN. Preparation of Nitrogen-doped Activated Carbon from Alkali/Urea Dissolution System and Its Electrochemical Properties[J]. Chemistry and Industry of Forest Products, 2021, 41(2): 10-16.

Figures/Tables 8

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References 24

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样品sample	温度/℃temperature	OAT/%	S_BET/(m²·g^-1)	总孔孔容/(cm³·g^-1)total pore volume	微孔孔容/(cm³·g^-1)micropore volume	介孔孔容/(cm³·g^-1)mesopore volume	平均孔径/nmaverage pore size
No.1	900	0	1256	0.76	0.53	0.23	2.36
No.2	800	15	1034	0.54	0.46	0.08	2.31
No.3	850	15	1120	0.62	0.51	0.11	2.30
No.4	900	15	1324	0.92	0.58	0.34	2.34

样品samples	C	N	O	N-6(吡啶型)N-6(pyridinic)	N-5(吡咯型)N-5(pyrrolic)	N-Q(季氮型)N-Q(quaternary)
No.1	85.07	1.88	13.05	37.1	54.4	8.5
No.2	78.23	4.59	17.20	40.8	28.2	21.0
No.3	87.70	3.94	8.27	39.2	42.7	18.1
No.4	83.84	3.50	12.66	47.0	31.7	21.3

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Preparation of Nitrogen-doped Activated Carbon from Alkali/Urea Dissolution System and Its Electrochemical Properties

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