Pomelo peel-derived, N-doped biochar microspheres as an efficient and durable metal-free ORR catalyst in microbial fuel cells

Zhang, Yuyuan; Deng, Licheng; Hu, Huawen; Qiao, Yu; Yuan, Huatang; Chen, Dongchu; Chang, Ming Xian; Wei, Hongyang

doi:10.1039/c9se00834a

Cited by 66 publications

(22 citation statements)

References 76 publications

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“…[ 20 ] Such a hierarchical porous structure can help disperse and stabilize LiOH·H 2 O nanoparticles. K‐BC3 exhibits an enormous specific surface area and total pore volume reaching as high as 1255.03 m 2 g −1 and 3.65 cm 3 g −1 , respectively, which are larger than K‐BC1 and K‐BC2 samples (Table 1, Figure S1 and S2, Supporting Information) and considerably greater than the p ‐BC sample and our previously reported pomelo peels‐derived porous biochar, [ 21 ] corncob biomass‐derived porous biochar, [ 15 ] and municipal sludge‐derived hierarchical biocarbon, [ 22 ] as well as other biochar most recently reported elsewhere. [ 23 ] This finding also reveals that KOH plays a pivotal role in constructing highly porous biochar with a large specific surface area.…”

Section: Resultsmentioning

confidence: 77%

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications

Zhang

Huang

et al. 2022

Energy Tech

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The inadequate utilization of low‐grade energy from industrial waste heat and solar energy calls for an efficient thermochemical heat storage material. The fabrication of a low‐cost but highly efficient composite comprising highly porous biochar and LiOH·H2O nanoparticles for heat storage applications is reported. The biochar is prepared by the KOH‐assisted pyrolysis of dead banyan leaves, and its microstructure and surface properties can be finely tuned by varying the KOH‐to‐biomass ratio. Such biochar can be mediated to possess a large specific surface area and total pore volume reaching as high as 1255.03 m2 g−1 and 3.65 cm3 g−1, respectively, superior to most previously reported biochar/biocarbon derived from different kinds of waste biomass. Besides, adequate functional groups and a hierarchical porous structure consisting of micropores and mesopores are demonstrated in the prepared biochar. The subsequent hydrothermal reaction with a short duration yields a biochar‐LiOH·H2O composite, where LiOH·H2O can be homogeneously immobilized with a nanoscale size within the porous biochar matrix. Thus, an enormous biochar/LiOH·H2O nanoparticles interface can be obtained, resulting in fast hydration reactions with water molecules. Consequently, a significant heat storage density of as high as 3089.6 kJ kg−1 is achieved within only 10 min, outstripping some recently reported thermochemical heat storage systems.

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Section: Resultsmentioning

confidence: 77%

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications

Zhang

Huang

et al. 2022

Energy Tech

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“…The SEM images of the three samples showed similar interconnected spherical morphologies. The formation mechanism of uniform carbon spheres of camellia flower via hydrothermal treatment involves three major processes: (i) dehydration, (ii) polymerization, and (iii) carbonization 41–43 . During the dehydration process, organic compounds such as cellulose, monosaccharides, acids, and phenolic compounds in the ground camellia powder decompose and dehydrate into reactive monomers like furan compounds 43,44 .…”

Section: Resultsmentioning

confidence: 99%

“…The formation mechanism of uniform carbon spheres of camellia flower via hydrothermal treatment involves three major processes: (i) dehydration, (ii) polymerization, and (iii) carbonization. [41][42][43] During the dehydration process, organic compounds such as cellulose, monosaccharides, acids, and phenolic compounds in the ground camellia powder decompose and dehydrate into reactive monomers like furan compounds. 43,44 The presence and composition of the organic compounds in the camellia flower play a crucial role in generating uniform carbon spheres via hydrothermal treatment.…”

Section: Characterization Of Activated Carbonmentioning

confidence: 99%

A sulfur self‐doped multifunctional biochar catalyst for overall water splitting and a supercapacitor from Camellia japonica flowers

Xia

Surendran

et al. 2022

Carbon Energy

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A versatile use of a sulfur self-doped biochar derived from Camellia japonica (camellia) flowers is demonstrated as a multifunctional catalyst for overall water splitting and a supercapacitor. The native sulfur content in the camellia flower facilitates in situ self-doping of sulfur, which highly activates the camellia-driven biochar (SA-Came) as a multifunctional catalyst with the enhanced electron-transfer ability and long-term durability. For water splitting, an SA-Came-based electrode is highly stable and shows reaction activities in both hydrogen and oxygen evolution reactions, with overpotentials of 154 and 362 mV at 10 mA cm −2 , respectively. For supercapacitors, SA-Came achieves a specific capacitance of 125.42 F g −1 at 2 A g −1 and high cyclic stability in a three-electrode system in a 1 M KOH electrolyte. It demonstrated a high energy density of 34.54 Wh kg −1 at a power density of 1600 W kg −1 as a symmetric hybrid supercapacitor device with a wide working potential range of 0-1.6 V.

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“…Lu et al produced N-doped biochar consisting of 2.7% N by hydrothermal carbonization of the seaweed Ulva prolifera at 200 °C for 4 h (Lu et al 2017). Zhang et al used pomelo peels as both nitrogen and carbon source to produce hydrothermally derived N-doped biochar (Zhang et al 2020b).…”

Section: In-situ Approachmentioning

confidence: 99%

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Kasera

Kolar

Hall

2022

Biochar

117

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Mitigation of toxic contaminants from wastewater is crucial to the safety and sustainability of the aquatic ecosystem and human health. There is a pressing need to find economical and efficient technologies for municipal, agricultural, aquacultural, and industrial wastewater treatment. Nitrogen-doped biochar, which is synthesized from waste biomass, is shown to exhibit good adsorptive performance towards harmful aqueous contaminants, including heavy metals and organic chemicals. Incorporating nitrogen into the biochar matrix changes the overall electronic structure of biochar, which favors the interaction of N-doped biochar with contaminants. In this review, we start the discussion with the preparation techniques and raw materials used for the production of N-doped biochar, along with its structural attributes. Next, the adsorption of heavy metals and organic pollutants on N-doped biochars is systematically discussed. The adsorption mechanisms of contaminant removal by N-doped biochar are also clearly explained. Further, mathematical analyses of adsorption, crucial to the quantification of adsorption, process design, and understanding of the mechanics of the process, are reviewed. Furthermore, the influence of environmental parameters on the adsorption process and the reusability of N-doped biochars are critically evaluated. Finally, future research trends for the design and development of application-specific preparation of N-doped biochars for wastewater treatment are suggested. Graphical abstract

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Pomelo peel-derived, N-doped biochar microspheres as an efficient and durable metal-free ORR catalyst in microbial fuel cells

Abstract: Naturally abundant pomelo peels were explored for the preparation of the metal-free carbon-based microspheres with high electrocatalytic activity and long-term durability toward ORR, holding potential for replacing noble metal-based catalysts.

Cited by 66 publications

References 76 publications

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications

A sulfur self‐doped multifunctional biochar catalyst for overall water splitting and a supercapacitor from Camellia japonica flowers

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

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Pomelo peel-derived, N-doped biochar microspheres as an efficient and durable metal-free ORR catalyst in microbial fuel cells

Abstract: Naturally abundant pomelo peels were explored for the preparation of the metal-free carbon-based microspheres with high electrocatalytic activity and long-term durability toward ORR, holding potential for replacing noble metal-based catalysts.

Cited by 66 publications

References 76 publications

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H2O Nanoparticles for Efficient Thermochemical Heat Storage Applications

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H2O Nanoparticles for Efficient Thermochemical Heat Storage Applications

A sulfur self‐doped multifunctional biochar catalyst for overall water splitting and a supercapacitor from Camellia japonica flowers

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

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Product

Resources

About

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications

Exploration of Highly Porous Biochar Derived from Dead Leaves to Immobilize LiOH·H₂O Nanoparticles for Efficient Thermochemical Heat Storage Applications