A Low‐Temperature Dehydration Carbon‐Fixation Strategy for Lignocellulose‐Based Hierarchical Porous Carbon for Supercapacitors

Chen, Zhimin; Li, Wei; Yang, Xiaomin; Qiu, Jieshan; Wang, Zichen

doi:10.1002/cssc.202101918

Cited by 10 publications

(9 citation statements)

References 77 publications

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“…Two kinds of approaches [ 4 ] for carbon sequestration are used to reduce the emission of CO 2 . The first one is ecological carbon sequestration [ 5 ] based on the plant photosynthesis, and the second alternative is technological carbon sequestration [ 6 ] by processing CO 2 in terms of carbon capture [ 7 ], utilization [ 8 , 9 ] and storage [ 10 ] (CCUS) technology [ 11 ], bioenergy with carbon capture and storage technology (BECCS) [ 12 ], and direct air carbon capture and storage technology (DACCS) [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Porous Structure of β-Cyclodextrin for CO2 Capture: Structural Remodeling by Thermal Activation

et al. 2022

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With a purpose of extending the application of β-cyclodextrin (β-CD) for gas adsorption, this paper aims to reveal the pore formation mechanism of a promising adsorbent for CO2 capture which was derived from the structural remodeling of β-CD by thermal activation. The pore structure and performance of the adsorbent were characterized by means of SEM, BET and CO2 adsorption. Then, the thermochemical characteristics during pore formation were systematically investigated by means of TG-DSC, in situ TG-FTIR/FTIR, in situ TG-MS/MS, EDS, XPS and DFT. The results show that the derived adsorbent exhibits an excellent porous structure for CO2 capture accompanied by an adsorption capacity of 4.2 mmol/g at 0 °C and 100 kPa. The porous structure is obtained by the structural remodeling such as dehydration polymerization with the prior locations such as hydroxyl bonded to C6 and ring-opening polymerization with the main locations (C4, C1, C5), accompanied by the release of those small molecules such as H2O, CO2 and C3H4. A large amount of new fine pores is formed at the third and fourth stage of the four-stage activation process. Particularly, more micropores are created at the fourth stage. This revealed that pore formation mechanism is beneficial to structural design of further thermal-treated graft/functionalization polymer derived from β-CD, potentially applicable for gas adsorption such as CO2 capture.

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Section: Introductionmentioning

confidence: 99%

Porous Structure of β-Cyclodextrin for CO2 Capture: Structural Remodeling by Thermal Activation

et al. 2022

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“…The gravimetric specific capacitances C g [F g –1 ] of the BNC-700 electrodes in the two-electrode test were calculated based on the GCD data by the following eq C normalg = 4 × I × normalΔ t / ( M × Δ U ) where M [g] is the total mass of the active material in two electrodes.…”

Section: Methodsmentioning

confidence: 99%

“…The energy density E g [Wh kg –1 ] and power density P g [W kg –1 ] were calculated based on the data of the two-electrode test by the following eqs and , E normalg = C normalg × normalΔ V 2 / ( 2 × 4 × 3.6 ) P normalg = E normalg × 3600 / normalΔ t …”

Section: Methodsmentioning

confidence: 99%

“…According to the equation E ∝ C *Δ V 2 , the energy density ( E ) of the supercapacitor is positively proportional to the specific capacitance ( C ) and is directly proportional to the square of the voltage window (Δ V ). , C can be improved by increasing the available specific surface area and introducing heteroatoms. , However, aqueous electrolytes can provide good advantages, such as (1) high C values obtained using water electrolytes, (2) high ionic conductivity (≈1000 mS cm –1 ) at high power density compared with organic and ionic liquid media (e.g., 60 mS cm –1 for TEABF 4 in acetonitrile), (3) high nonflammable safety, (4) environmental friendliness, (5) relatively low price, and (6) a simple device assembly process without the requirements of an inert atmosphere and thorough drying. − Unfortunately, using the traditional strong acid and alkali aqueous electrolytes such as H 2 SO 4 and KOH, it is commonly difficult to overcome the decomposition voltage of water (1.23 V), which greatly reduces high Δ V . But the neutral electrolytes can easily break through this limitation to achieve a higher Δ V (the commonly used neutral electrolytes including Na 2 SO 4 , Li 2 SO 4 , K 2 SO 4 , and so on) .…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional Template Prepares N-, O-, and S-Codoped Mesoporous 3D Hollow Nanocage Biochar with a Multilayer Wall Structure for Aqueous High-Performance Supercapacitors

Lin

et al. 2023

ACS Appl. Energy Mater.

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To recycle wastes and develop renewable energy, much effort has been focused on converting biowastes into porous carbon for supercapacitors. Porous nanocage-like carbons have excellent capacitive properties, but generally their preparation methods are costly or complex. Herein, a “one-step” strategy of synchronous activation and support through the thermal decomposition of a multifunctional template (magnesium acetate, Mg(Ac)2) is designed to prepare N-, O-, and S-codoped mesoporous hollow biochar nanocages (BNC-700). The BNC-700 prepared displays an interconnected porous structure and a two-dimensional (2D) multilayer wall/three-dimensional (3D) hollow nanocage structure with abundant active heteroatoms and edge defects. Due to their specific structures, high surface areas (1369 m2 g–1), and large pore volumes (1.81 cm3 g–1), the assembled supercapacitor delivers a considerable energy density of 37.4 Wh kg–1 at 212 W kg–1 and cycling stability of 99.5% after 15,000 cycles. The unique structure and N, O, and S codoping characteristics ensure a potential application for BNC-700 in supercapacitors. In summary, a strategy is designed for the green, simple, and cost-effective preparation of high-performance biochar for advanced energy storage devices.

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“…About 20% of amorphous silica is distributed in the cell and intercellular layer of RH, and it can be used as a natural template of mesoporous carbon materials with multilayer pore structures for the enhancement of the specific surface area and electrochemical performance of carbon materials . Most studies so far have focused on the reduction, modification, and activation of RH using catalysts and the synthesis of RH-based composite materials. − Lv et al synthesized rice husk-based activated carbon through pyrolysis and simultaneous KOH-activation and EDTA-4Na-modification, and the as-prepared carbon materials exhibited high surface areas and rich functional groups as well as good adsorption performance for phenol . Zhang et al prepared rice husk-based magnetic porous carbon via the pyrolysis of pretreated rice husk with FeCl 3 and ZnCl 2 , and found that as-obtained magnetic porous carbon showed high porosity and magnetization .…”

Section: Introductionmentioning

confidence: 99%

One/Two-Step Contribution to Prepare Hierarchical Porous Carbon Derived from Rice Husk for Supercapacitor Electrode Materials

Qin

Zhang

et al. 2023

ACS Omega

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Grain processing generates vast amounts of agricultural byproducts, and biomass porous carbon electrode materials based on this have attracted broad research interests. Rice husk (RH) is one of the promising feedstocks owing to its good abundance and cheap price. Here, a RH-based porous carbon (RHPC) material was successfully prepared using first-step carbonization and second-step decalcification. The influence of carbonization temperature and decalcification treatment on the structure and electrochemical properties of the RH-based carbon materials were investigated. Thermogravimetric analysis, hydrogen element analysis, scanning electron microscopy, X-ray diffraction, and electrochemical performance tests were used to characterize and analyze the prepared RH-based carbon materials. After carbonization at 1000 °C (RH-1000) and decalcification treatment, RHPC-1000 showed the highest specific surface area of 643.48 m 3 /g and the largest pore volume of 0.52 cm 3 /g, which were about 1.8 times and 2.5 times that of RH-1000, respectively. RHPC-1000 also possessed a high capacitance retention capability of 97.2% after 10 000 charge−discharge cycles. The results demonstrated the excellent capacitive behavior and superior electrochemical performance of RHPC-1000. In summary, this study reveals a simple and effective preparation method of biomass porous carbon for supercapacitor electrode materials and provides new insight into the high-value utilization of waste biomass resources.

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A Low‐Temperature Dehydration Carbon‐Fixation Strategy for Lignocellulose‐Based Hierarchical Porous Carbon for Supercapacitors

Cited by 10 publications

References 77 publications

Porous Structure of β-Cyclodextrin for CO2 Capture: Structural Remodeling by Thermal Activation

Porous Structure of β-Cyclodextrin for CO2 Capture: Structural Remodeling by Thermal Activation

Multifunctional Template Prepares N-, O-, and S-Codoped Mesoporous 3D Hollow Nanocage Biochar with a Multilayer Wall Structure for Aqueous High-Performance Supercapacitors

One/Two-Step Contribution to Prepare Hierarchical Porous Carbon Derived from Rice Husk for Supercapacitor Electrode Materials

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