Effect of carbonization temperature on CO2 adsorption behavior of activated coal char

Quan, Cui; Jia, Xiangyu; Gao, Ningbo

doi:10.1016/j.joei.2021.04.003

Cited by 41 publications

(9 citation statements)

References 30 publications

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“…The higher specific surface area and the larger pore volume of Sn@HPCNFs (377.1 m 2 g −1 , 0.234 cm 3 g −1 ) over SnO 2 @HPCNFs (31.5 m 2 g −1 , 0.039 cm 3 g −1 ) provided more active redox sites for the fast charge storage by the non-faradaic reaction. The reason for the large difference in the specific surface areas of the two electrodes was the carbonization temperature [56,57].…”

Section: Resultsmentioning

confidence: 99%

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Liang

Dong

et al. 2023

Sci. China Mater.

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Lithium-ion batteries (LIBs) have been widelyused as grid-level energy storage systems to power electric vehicles, hybrid electric vehicles, and portable electronic devices. However, it is a big challenge to develop high-capacity electrode materials with large energy storage and ultrafast charging capability simultaneously due to the sluggish charge carrier transport in bulk materials and fragments of active materials. To address this issue, composite electrodes of SnO 2 nanodots and Sn nanoclusters embedded in hollow porous carbon nanofibers (denoted as SnO 2 @HPCNFs and Sn@HPCNFs) were respectively constructed programmatically for customized LIBs. Highly interconnected carbon nanofiber networks served as fast electron transport pathways. Additionally, the hierarchical hollow and porous structure facilitated rapid Li-ion diffusion and alleviated the volume expansion of Sn and SnO 2 . SnO 2 @HPCNFs delivered a remarkably high capacity of 899.3 mA h g −1 at 0.1 A g −1 due to enhanced Li adsorption and high ionic diffusivity. Meanwhile, Sn@HPCNFs displayed fast charging capability and superior high rate performance of 238.8 mA h g −1 at 5 A g −1 (~10 C) due to the synergetic effect of enhanced Li-ion storage in the bulk pores of Sn and improved electronic conductivity. The investigation of the electrochemical behaviors of SnO 2 and Sn by tailoring the carbonization temperature provides new insight into constructing high-capacity anode materials for high-performance energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Liang

Dong

et al. 2023

Sci. China Mater.

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“…Besides the reaction mechanisms stated above, how external environments affect the above catalytic reactions is another crucial issue, especially the effects of temperatures. − Gibbs free energy is calculated under different temperatures to take into consideration the effects of reaction temperatures. The Gibbs free energies for gas and solid are shown in eqs –.…”

Section: Results and Discussionmentioning

confidence: 99%

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Wang

2022

ACS Appl. Mater. Interfaces

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The energy barrier of CO 2 chemically adsorbed on hexagonal boron nitride (h-BN) is relatively big. In order to cut down the energy barriers and facilitate fast adsorption of CO 2 , it is necessary to apply catalysts as a promoter. In this study, single-atom iron is introduced as the catalyst to reduce the energy barriers of CO 2 adsorbed on pure/doped h-BN. Through density functional theory calculations, catalytic reaction mechanisms, stability of single-atom iron fixed on adsorbents, CO 2 adsorption characteristics, and features of thermodynamics/reaction dynamics during adsorption processes are fully investigated to explain the catalytic effects of single-atom iron on CO 2 chemisorption. According to calculations, when CO 2 and OH − get into activated states (i.e., CO 2•− and • OH) with the help of single-atom iron, their chemical activities will be promoted to a large degree, which makes the transition state (TS) energy barrier of HCO 3 − to decrease by 92.54%. In the meantime, it is proved that single-atom iron could be stably fixed on doped h-BN with the binding energy larger than 2 eV to achieve sustainable catalysis. With the presence of single-atom iron, TS energy barriers of CO 2 adsorbed on h-BN with the presence of H 2 O decreased by 94.39, 78.87, and 30.63% over pure h-BN, 3C-doped h-BN, and 3N-doped h-BN, respectively. In the meantime, thermodynamic analyses indicate that TS energy barriers are mainly determined by element doping and temperatures are a little beneficial to the reduction of TS energy barriers. With the above aspects combined, the results of this study could supply crucial information for massively and quickly capturing CO 2 in real industries.

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“…It has been reported in various studies that the SSA and micropores are vital for CO 2 adsorption. 39,40 With increase in activation temperature, the SSA and micropores increase, and hence, the CO 2 adsorption capacity is the highest for PCN-900. The CO 2 uptake values for PCN-700 and PCN-800 are calculated to be 4.33 and 4.21 mmol g −1 , respectively.…”

Section: ■ Electrochemical Analysismentioning

confidence: 99%

Phosphorus and Nitrogen Codoped Porous Carbon Nanosheets for Energy Storage and Gas Adsorption

Panda,

Roy,

Barman

2024

ACS Appl. Nano Mater.

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Heteroatom-doped porous carbon has emerged as a promising candidate for capacitive energy and gas storage applications because of its abundant availability and cost-effectiveness. In this study, a solvothermal strategy was adopted to synthesize phosphorus (P) and nitrogen (N) codoped activated carbon (PCN-x) with an abundance of micropores, which can be utilized in both energy storage and gas (such as H2 and CO2) adsorption applications. The optimized P and N codoped porous carbon activated at 800 °C (PCN-800) shows a very high specific capacitance (C s) of 575.15 F g–1 in an acid medium, and the C s value was calculated to be 477.63 F g–1 under a 1 A g–1 current in an alkaline medium. The symmetric device performance shows an excellent energy density of 10.61 W h kg–1 at a power density of 250 W kg–1 along with a capacitance retention of 91.23% up to 10,000 cycles in an alkaline medium. The P and N codoped porous carbon activated at 900 °C (PCN-900) shows a high specific surface area (SSA) of 2953.2 m2 g–1 with a high micropore volume of 0.77 cc g–1. It also shows a good H2 storage capacity of 3.26 wt % at 77 K and 1 bar pressure. The CO2 adsorption capacities were calculated to be 5.98 mmol g–1 at 0 °C and 3.61 mmol g–1 at 25 °C with good selectivity of CO2/N2 and CO2/CH4. The incorporation of P and N codoped species into porous carbon nanosheets presents a promising avenue for improving the performance of energy and gas storage applications. The synergistic effects of P and N doping and the porous morphology and high SSA contribute to the improved electrochemical performance, enabling higher energy and power densities in supercapacitor devices along with good H2 and CO2 uptake capacities.

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Effect of carbonization temperature on CO2 adsorption behavior of activated coal char

Cited by 41 publications

References 30 publications

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Phosphorus and Nitrogen Codoped Porous Carbon Nanosheets for Energy Storage and Gas Adsorption

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Effect of carbonization temperature on CO2 adsorption behavior of activated coal char

Cited by 41 publications

References 30 publications

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

Fe-Catalyzed CO2Adsorption over Hexagonal Boron Nitride with the Presence of H2O

Phosphorus and Nitrogen Codoped Porous Carbon Nanosheets for Energy Storage and Gas Adsorption

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Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O