Reduced humic acid nanosheets and its uses as nanofiller

Duraia, El‐Shazly M.; Henderson, Brooks; Beall, Gary W.

doi:10.1016/j.jpcs.2015.05.001

Cited by 28 publications

(11 citation statements)

References 15 publications

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“…HA exhibits strong coordination, exchange and adsorption actions with metal ions as strong binding energy always exists between them . Beall groups have reported that HA nanoparticles exhibit wrinkled sheet‐like shapes and have close particle size, thickness, C/O mass ratio and I G /I D (intensity ratio of significant G and D peaks in Raman spectrum) values to GO nanosheets, indicating that HA has similar physical and chemical structures, surface polarity and activity to GO. Hence, HA layers can be regarded as a natural GO .…”

Section: Introductionmentioning

confidence: 99%

“…Beall groups have reported that HA nanoparticles exhibit wrinkled sheet‐like shapes and have close particle size, thickness, C/O mass ratio and I G /I D (intensity ratio of significant G and D peaks in Raman spectrum) values to GO nanosheets, indicating that HA has similar physical and chemical structures, surface polarity and activity to GO. Hence, HA layers can be regarded as a natural GO . However, it is difficult to peel HA into layers because natural HA macromolecules are tightly stacked or agglomerated by van der waals force, hydrogen bond and π‐π interaction.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, HA layers can be regarded as a natural GO. [23,24,28] However, it is difficult to peel HA into layers because natural HA macromolecules are tightly stacked or agglomerated by van der waals force, hydrogen bond and π-π interaction. Huang et al [23] have synthesized few-layer GO particles via a simple hydrothermal treatment of HA, showing that hydrothermal treatment can play a strong peeling role on HA.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrothermal Synthesis of Humate‐Layer‐Based Bimetal Organic Framework Composites as High Rate‐Capability and Enery‐Density Electrode Materials for Supercapacitors

Wang

Yang

et al. 2020

ChemistrySelect

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A humate‐layer‐based bimetal organic framework (HA‐NiCo‐BPDC) material is successfully synthesized using humate layers obtained by ultrasonic‐hydrothermal peeling as a substrate and BPDC as a ligand via a hydrothermal approach. It exhibits a porous composite structure in which flower‐like NiCo‐BPDC nanosheets are loaded on humate layers, originating a guiding effect of humate layers on the NiCo‐BPDC growth. HA‐NiCo‐BPDC owns a similar crystal structure to NiCo‐BPDC, in which humate and BPDC ions have coordinated with nickel or cobalt ions to form carboxylates. Nickel and cobalt ions present positive divalent states, and they have close ability to coordinate with BPDC or humate ions. Owing to unique hierarchical architectures and fascinating synergetic effects between NiCo‐BPDC nanosheets and humate layers, HA‐NiCo‐BPDC has high specific capacitance and rate capability, and low internal resistance and charge transfer resistance. It exhibits better rate capability than NiCo‐BPDC and larger specific capacitance than HA−Ni(Co)‐BPDC. Moreover, HA‐NiCo‐BPDC//rGO asymmetric supercapacitor has wide operating potential window, high energy density and cycling stability. All those show that HA‐NiCo‐BPDC composites are a promising electrode material for supercapacitors. This study exploits a novel way for value‐added applications of humates and their natural sources “humic acids”.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Synthesis of Humate‐Layer‐Based Bimetal Organic Framework Composites as High Rate‐Capability and Enery‐Density Electrode Materials for Supercapacitors

Wang

Yang

et al. 2020

ChemistrySelect

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“…Humic acid (HA), a kind of biomass material with abundant raw materials and sources, is extracted from low-grade coal (i.e., peat, lignite, and weathered coal). [10][11][12][13] HA consists of a skeleton of aliphatic or aromatic units cross-linked primarily via all sorts of oxygencontaining functional groups, allures to consider it as a new type of charring agent due to its carbon-enriched chemical composition. [14] For example, Yin et al synthesized high-quality activated carbons (ACs) from HA with a well-pleasing carbonaceous precursor to apply them in supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Preparation of novel biomass humate flame retardants and their flame retardancy in epoxy resin

Liu

Shi

Kundu

et al. 2020

J of Applied Polymer Sci

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Humic acid (HA), a biomass material with plentiful oxygen‐containing functional groups, showed huge potential to be considered as a promising charring agent in flame retardancy. In this study, this HA was modified with four different metal ions like Fe2+, Mn2+, Al3+, and Cu2+ and finally, introduced into the epoxy resin (EP) to enhance the flame retardancy of the EP and the dispersion of these flame retardants into the EP matrix. When 10 wt% of HA‐Fe and HA‐Mn were incorporated into EP matrix, the limiting oxygen index (LOI) was increased from 21.2% for EP to 26.6 and 25.3% for the EP composites and the peak heat release rate (pHRR) was reduced by 36 and 35.5%, respectively. Such a significant improvement in flame retardancy was attributed to the catalytic charring of HA in the presence of metal ions, which ultimately increased the residual char formation and produced compact char layers during the combustion process to retard the transfer of heat and combustible gases between the EP composites and the flame zone. Finally, this kind of application provided a feasible way for the development of an environmentally friendly flame retardant with high efficiency, which improved the fire safety of EP matrix.

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“…Humic acid, a natural graphite oxide-like material [16] containing a number of oxygenated groups around the edges of the graphene-like core, has been used as a precursor to prepare graphene-related materials [17,18]. Water-soluble potassium humate is a neutralized product of insoluble humic acid and KOH.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Huang

Geng

Kang

et al. 2018

Journal of Nanomaterials

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Mesoporous graphene materials (MG-X) were prepared from potassium humate coupled with magnesium acetate. The freezedrying pretreatment and MgO particles not only prevent the agglomeration of graphene sheets and form mesopores but also help to reduce the oxygen content and enlarge the sp 2 carbon domain of MG-X. MG-X possess optimized characteristics including large specific surface area (>1100 m 2 ·g −1 ), high mesoporosity (~90%), and low oxygen content (~7%). When used as supercapacitor electrodes, MG-X demonstrate optimal electrochemical performances among all materials prepared here, such as high gravimetric capacitance (150 F·g −1 at high current density of 3.3 A·g −1) and enhanced rate capability with the capacitance retention of~80% from 0.041 to 3.3 A·g −1 . Moreover, MG-5 exhibits good cycling stability with a capacitance retention of 98.6% after 1000 cycles at 2.46 A·g −1 . This work provides a facile and efficient preparation method for mesoporous graphene materials used as supercapacitor electrodes.

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Reduced humic acid nanosheets and its uses as nanofiller

Cited by 28 publications

References 15 publications

Hydrothermal Synthesis of Humate‐Layer‐Based Bimetal Organic Framework Composites as High Rate‐Capability and Enery‐Density Electrode Materials for Supercapacitors

Hydrothermal Synthesis of Humate‐Layer‐Based Bimetal Organic Framework Composites as High Rate‐Capability and Enery‐Density Electrode Materials for Supercapacitors

Preparation of novel biomass humate flame retardants and their flame retardancy in epoxy resin

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

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