Porous biochar nanosheets loaded with Fe<sub>3</sub>C particles accelerate electrochemical reactions and their applications in Li–S batteries

Wang, Xuri; Zhang, Yawen; Chang, Qihong; Wu, Yaqin; Lei, Weixin; Zou, Youlan; Ma, Zengsheng; Pan, Yong

doi:10.1039/d1se00515d

Cited by 14 publications

(5 citation statements)

References 43 publications

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“…This indicates the reduction of elemental sulfur to longchain LiPSs and the continual reduction to short chain. 32 The process of Li 2 S 2 /Li 2 S being oxidized to LiPSs and finally to sulfur corresponds to the peaks of oxidation that occur at about 2.28 and 2.35 V. 33 In the CV (Figure 6b) curves of composites, four samples have a similar shape. The potential at which the redox reaction occurs corresponds to the position of dQ/dV.…”

Section: Resultsmentioning

confidence: 97%

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Zhang

Gao

et al. 2022

ACS Omega

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In this work, we proposed a facile dissolution–crystallization strategy based on density functional theory calculations to achieve rapid as well as uniform distribution of sulfur on porous carbon. Sulfur-containing solution can completely penetrate porous material and in preference remove into the pores under the influence of capillary force, and sulfur tends to crystallize on the defective even non-defective carbon matrix rather than agglomerate. The S/PC composites prepared by this method can still achieve uniform distribution of sulfur when the sulfur content is as high as 85%. All operations can be completed within a few minutes without any heating. Compared with common melt-diffusion and vapor-phase infusion, this approach has lower energy consumption and is simple, safe, continuous, and rapid.

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Section: Resultsmentioning

confidence: 97%

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Zhang

Gao

et al. 2022

ACS Omega

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“…The Fe 2p 1/2 band can further divide to Fe 2+ at 721.1 eV and Fe 3+ at 723.0 eV. Besides, the N coordinated with Fe 2p species (Fe 2+ or Fe 3+ ) can be seen at about 711.1 eV [52,53] …”

Section: Resultsmentioning

confidence: 99%

“…Besides, the N coordinated with Fe 2p species (Fe 2 + or Fe 3 + ) can be seen at about 711.1 eV. [52,53] The porosity of carbonized samples compared with N-CMP was investigated. As shown in Figure 4 and Figure S4, the nitrogen adsorption/desorption isotherms of N-CMP and carbon samples can be classified as mixed I/IV type, suggesting the existence of micropores and mesopores in structures.…”

Section: Chempluschemmentioning

confidence: 99%

Non‐Precious Metal‐Doped Carbon Materials Derived From Porphyrin‐Based Porous Organic Polymers for Oxygen Reduction Electrocatalysis

et al. 2022

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The cathodic oxygen reduction reaction (ORR) is important in the development of renewable energy devices, to produce novel and non-precious metal catalysts with high electrocatalytic activity to reduce the consumption of non-renewable platinum (Pt) catalyst. In this work, we developed N-doped and Fe/N dual-doped porous carbons as catalysts for ORR simply by high-temperature pyrolysis of porphyrin-based conjugated microporous polymers (CMPs). By combination of heteroatom doping, highly porous structure and tubular morphology, the as-prepared carbon samples exhibited high electrocatalytic activity with 4-electron transfer mechanism, nearly close to the commercial Pt/C catalyst. In particular, among these samples, the Fe/N-CMP-1000 displayed a higher onset potential (0.95 eV), positive half-wave potential (0.85 eV) and limiting current density value (5.1 mA cm À 2 ) as well as good durability and better methanol tolerance contrasting with Pt/C catalyst, suggesting that the as-prepared metal-free catalysts from porphyrin-based CMPs show great potential for ORR.

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“…In addition, a comparison of the SEM images of HTC‐CFe and HTC‐0.3Fe reveals that the particles on the surface of HTC‐0.3Fe are more numerous and more uniformly distributed, while there are fewer particles on the surface of HTC‐CFe and agglomeration of surface‐loaded materials occurs. This may be because, under this reaction condition, K 2 FeO 4 mainly catalyzes saccharides and reacts with them to produce carbon‐encapsulated particles, which cannot oxidize and decompose wood chips better; 38 therefore, fewer carbon‐encapsulated iron‐core particles are formed in HTC‐CFe without molasses, and there are some K 2 FeO 4 molecules reacting with each other to produce agglomeration.…”

Section: Resultsmentioning

confidence: 99%

Preparation of hydrochar by one‐step hydrothermal carbonization with potassium ferrate‐assisted activation for the removal of tetracycline in water

Zhou

Bao

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: Woody biomass has a low hydrothermal-carbonization (HTC) degree and the hydrolysis process of some of its components is similar to that of saccharides. To improve the adsorption performance of wood-chips hydrothermal char (hydrochar) for tetracycline in water, molasses and potassium ferrate (K 2 FeO 4 ) were added to its HTC process; K 2 FeO 4 catalyzed the carbonization of raw materials and the surface of wood chips and saccharides in molasses, along with the iron ions mutually polymerized, added more reactive-oxygen functional groups to the hydrochar surface. The effects of K 2 FeO 4 and molasses on the morphology, pore structure, surface oxygen-containing functional groups, and tetracycline-adsorption properties of hydrothermal carbon were investigated. RESULTS:The strong oxidizing properties of K 2 FeO 4 promoted the hydrolysis of raw material. The modified hydrochar formed more oxygen-containing functional groups and produced Fe O bonds with an increased specific surface area. For the adsorption of tetracycline in water, the pseudo-second-order kinetic model and Freundlich isotherm were more consistent with the hydrochar-adsorption process. The adsorption mechanism favored a combination of physical and chemical adsorption, with chemisorption being predominant. The maximum tetracycline-adsorption capacity of HTC-0.15Fe was 119.7 mg g −1 , which is significantly higher than that of unmodified hydrochar HTC-C (56.4 mg g −1 ). Furthermore, molasses addition effectively improved the hydrochar structure, forming carbon-coated iron-core particles on its surface, which increased adsorption performance.CONCLUSION: K 2 FeO 4 -catalyzed hydrochar produced from wood chips and sugarcane molasses is an effective adsorbent for tetracycline removal from water. This work provides innovative insights into the recycling and effective use of wood chips and molasses for environmental remediation and waste treatment.

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Porous biochar nanosheets loaded with Fe₃C particles accelerate electrochemical reactions and their applications in Li–S batteries

Abstract: Reasonable design of matrix with strong adsorption for polysulfides, fast reaction kinetics and simple preparation process is an urgent need for lithium-sulfur battery (Li-S battery) applications. Therefore, in this...

Cited by 14 publications

References 43 publications

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Non‐Precious Metal‐Doped Carbon Materials Derived From Porphyrin‐Based Porous Organic Polymers for Oxygen Reduction Electrocatalysis

Preparation of hydrochar by one‐step hydrothermal carbonization with potassium ferrate‐assisted activation for the removal of tetracycline in water

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Porous biochar nanosheets loaded with Fe3C particles accelerate electrochemical reactions and their applications in Li–S batteries

Abstract: Reasonable design of matrix with strong adsorption for polysulfides, fast reaction kinetics and simple preparation process is an urgent need for lithium-sulfur battery (Li-S battery) applications. Therefore, in this...

Cited by 14 publications

References 43 publications

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Facile Dissolution–Crystallization Strategy to Achieve Rapid and Uniform Distribution of Sulfur on Porous Carbon for Lithium–Sulfur Batteries

Non‐Precious Metal‐Doped Carbon Materials Derived From Porphyrin‐Based Porous Organic Polymers for Oxygen Reduction Electrocatalysis

Preparation of hydrochar by one‐step hydrothermal carbonization with potassium ferrate‐assisted activation for the removal of tetracycline in water

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Porous biochar nanosheets loaded with Fe₃C particles accelerate electrochemical reactions and their applications in Li–S batteries