Experimental and theoretical demonstration of the relative effects of O-doping and N-doping in porous carbons for CO2 capture

Ma, Xiancheng; Li, Liqing; Zeng, Zheng; Chen, Ruofei; Wang, Chunhao; Zhou, Ke; Li, Hailong

doi:10.1016/j.apsusc.2019.03.162

Cited by 84 publications

(38 citation statements)

References 44 publications

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“…The N1s spectra could be resolved into four peaks at about 398.0, 399.3, 400.4, and 402.0 eV ascribed to pyridinic-N, pyrrolic-N, graphitic-N, and oxidized-N, respectively. 37 And the nitrogen-containing functional groups distribution was presented in Figure 7. As shown in Figures 6 and 7, the most nitrogen-containing functional groups were pyridinic-N, and the second was pyrrolic-N. And it could be seen that all the nitrogen-containing functional groups increased with the increase in nitrogen-doping mass ratio, especially pyridinic-N and pyrrolic-N.…”

Section: Xps Analysismentioning

confidence: 99%

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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Activated carbon is a promising material that has a broad application prospect.In this work, biomass (tea seed shell) was used to prepare activated carbon with KOH activation (referred to as AC), and nitrogen was doped in activated carbon using melamine as the nitrogen source (referred to as NAC-x, where x is the mass ratio of melamine and activated carbon). The obtained activated biomass carbon (activated bio-carbon) samples were characterized by Brunauer-Emmett-Teller (BET)-specific surface area analysis, ultimate analysis, X-ray photoelectron spectroscopy (XPS) analysis, Raman spectrum analysis, and X-ray diffraction (XRD) patterns. The specific surface areas of activated bio-carbons were 1503.20 m 2 /g (AC), 1064.54 m 2 /g (NAC-1), 1187.93 m 2 /g (NAC-2), 1055.32 m 2 /g (NAC-3), and 706.22 m 2 /g (NAC-4), revealing that nitrogen-doping process leads to decrease in specific surface area. XPS analysis revealed that the main nitrogen-containing functional groups were pyrrolic-N and pyridinic-N. The capacity of CO 2 capture and electrochemical performance of activated bio-carbon samples were investigated. The CO 2 capturing capacity followed this order: AC (3.15 mmol/g) > NAC-2 (2.75 mmol/g) > NAC-1 (2.69 mmol/g) > NAC-3 (2.44 mmol/g) > NAC-4 (1.95 mmol/g) at 298 K at 1 bar, which is consistent with the order of specific surface area. The specific surface area played a dominant role in CO 2 capturing capacity. As for supercapacitor, AC-4 showed the highest specific capacitance (168 F/g) at the current density of 0.5 A/g, but NAC-2 showed the best electrochemical performance (89 F/g) at 2 A/g. Nitrogen-containing functional groups and specific surface area both had an important impact on electrochemical performance. In general, NAC-3 and NAC-2 produced excellent electrochemical performance. Compared with NAC-3, less melamine was used to prepare NAC-2; therefore, NAC-2 was considered as the best activated bio-carbon for supercapacitor for 141 F/g (at 0.5 A/g), 108 F/g (at 1 A/g), and 89 F/g (at 2 A/g) in this work.

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Section: Xps Analysismentioning

confidence: 99%

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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“…The CO 2 uptake and textural properties of these porous carbons were compared with various carbon materials ( Tables 3 and S3 ). Among free N-doped porous carbons, HKC-800-1 shows superior CO 2 adsorption of 217 mg/g relative to commercial activated carbon (123.2 mg/g), 48 OMC (132 mg/g), 49 OM-CNS (175.1 mg/g), 50 CA-HC200 (198.4 mg/g), 51 and PC500 (190.5 mg/g), 52 and it was also comparable with PMMC-800 (237.6 mg/g), 53 NET2-2-700-2 (228.8 mg/g), 54 and L2600 (233.2 mg/g). 36 Compared with these N-doped porous carbons, such as salt-templated carbons with arginine (147.8 mg/g), 56 FC4 (178.2 mg/g), 57 OTSS-1-550 (191.4 mg/g), 58 N-PHCS-900 (194.5 mg/g), 59 microporous carbon from fern leaves (198.9 mg/g), 60 and PDA 0.3 /MA 0.7 -2 (202.4 mg/g), 62 the CO 2 uptake of our porous carbons was also decent.…”

Section: Resultsmentioning

confidence: 99%

“…The results suggested that the O doping may not be effective enough at improving CO 2 capture under the dominant effect of microporosity, and previous references also showed similar results. 52 , 54 …”

Section: Resultsmentioning

confidence: 99%

Selectable Microporous Carbons Derived from Poplar Wood by Three Preparation Routes for CO₂ Capture

et al. 2020

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Biomass-derived porous carbons are one kind of sustainable, extensive, and flexible carbon material for CO 2 capture. Here, we prepared several microporous carbons from poplar wood by three preparation routes. Especially, the residues of the poplar wood after the bioethanol process were explored as precursors to prepare activated carbon by KOH and ZnCl 2 activation. By the adjustment of the preparation routes and the optimization of the activation conditions, these porous carbons exhibited diversified morphology (sponge, nanosheets, and honeycomb structure), tunable porosity (specific surface areas: 511–2153 m 2 /g), and narrow micropore distribution (0.55–1.2 nm). These carbons had a high CO 2 uptake of up to 217 mg/g at 273 K and 1 bar, which was comparable with those of many N-doped porous carbons, and possessed moderate isosteric heat of CO 2 adsorption (21.1–43.2 kJ/mol), good cyclic ability, and high CO 2 /N 2 selectivity (Henry’s law: 44.0). The results indicated that CO 2 uptake of these carbons was mainly decided by their micropore volume ( d < 1.0 nm) at 273 K and 1 bar. This work provides an important reference for preparing promising CO 2 adsorbents with tunable structures from similar biomass resources.

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“…[32] Also from Figure 2b, we can learn that the pore sizes of the samples were mainly concentrated around 0.7 nm, which also indicated that OPC samples were mainly microporous, and this range belonged to the ultramicropores. [33] By calculating the N 2 adsorption isotherms, specific surface area and pore size of OPC samples (Table 1) were obtained. When the activation temperature was 600°C, both SBET and Vtotal of OPC600 sample were unsatisfactory.…”

Section: Structure and Chemical Of Activated Carbonsmentioning

confidence: 99%

Adsorption of Volatile Organic Compounds (VOCs) on Oxygen‐rich Porous Carbon Materials Obtained from Glucose/Potassium Oxalate

Wang

Gao

et al. 2021

Chemistry An Asian Journal

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To investigate the effects of oxygen-containing functional groups on the adsorption of volatile organic compounds (VOCs) with different polarity, oxygen-rich porous carbon materials (OPCs) were synthesized by heat treatment of glucose/potassium oxalate material. The carbon material had a large specific surface area (1697 m 2 g À 1 ) and a high oxygen content (18.95 at.%). OPC exhibited high adsorption capacity of toluene (309 mg g À 1 ) and methanol (447 mg g À 1 ). The specific surface area and total pore volume determined the adsorption capacity of toluene and methanol at the high-pressure range, while the oxygen-containing groups became the main factor affecting the methanol adsorption at the low-pressure range due to the hydrogen bond interaction through the density functional theory (DFT) calculations. This study provides an important hint for developing a novel O-doped adsorbent for the VOCs adsorption applications and analyzing the role of oxygencontaining groups in the VOCs adsorption under the lowpressure range.

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Experimental and theoretical demonstration of the relative effects of O-doping and N-doping in porous carbons for CO2 capture

Cited by 84 publications

References 44 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Selectable Microporous Carbons Derived from Poplar Wood by Three Preparation Routes for CO₂ Capture

Adsorption of Volatile Organic Compounds (VOCs) on Oxygen‐rich Porous Carbon Materials Obtained from Glucose/Potassium Oxalate

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Experimental and theoretical demonstration of the relative effects of O-doping and N-doping in porous carbons for CO2 capture

Cited by 84 publications

References 44 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Selectable Microporous Carbons Derived from Poplar Wood by Three Preparation Routes for CO2 Capture

Adsorption of Volatile Organic Compounds (VOCs) on Oxygen‐rich Porous Carbon Materials Obtained from Glucose/Potassium Oxalate

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Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Selectable Microporous Carbons Derived from Poplar Wood by Three Preparation Routes for CO₂ Capture