Haojie Fei

Tomas Bata University in Zlín

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Petr Sáha

Tomas Bata University in Zlín

Natalia E. Kazantseva

Tomas Bata University in Zlín

Gengchao Wang

East China University of Science and Technology

Constantin Bubulinca

Tomas Bata University in Zlín

Hua Bao

Shanghai Jiao Tong University

Nabanita Saha

Tomas Bata University in Zlín

Lukáš Münster

Tomas Bata University in Zlín

Quoc Bao Le

Ton Duc Thang University

Elif Vargün

Muğla University

Mária Omastová

Slovak Academy of Sciences

Cooperative Institutions

Tomas Bata University in Zlín

East China University of Science and Technology

Jilin University

Brno University of Technology

University of Pavol Jozef Šafárik

Shanghai Jiao Tong University

Charles University

Slovak Academy of Sciences

University of Chinese Academy of Sciences

Czech Academy of Sciences, Institute of Macromolecular Chemistry

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Reduced Graphene Oxide Composited with Ni-MOF and PANI Applied as Electrodes for Supercapacitor

ECS Transactions (2020)

Quoc Bao Le Haojie Fei Constantin Bubulinca Fahanwi Asabuwa Ngwabebhoh Natalia E. Kazantseva

The different composites made of rGO, Ni-MOF, and PANI were synthesized via the hydrothermal method and used for the fabrication of electrodes for supercapacitors. The structure and morphology of composites obtained were characterized via SEM, XRD, and FTIR. The electrochemical properties of electrodes were studied using CV and galvanostatic charge/discharge methods, as well as by EIS. The results obtained demonstrated that the incorporation of rGO, Ni-MOF, and PANI significantly increase the specific capacitance of electrodes. It can be explained by the formation of a better specific surface area with a branched porous structure that enhances the contact between electrolyte ions with the electrode materials. The specific capacitance of rGO/Ni-MOF/PANI in 1 M H 2 SO 4 electrolyte is 195.14 F/g at 0.2 A/g charge-discharge and the average capacitance retention remained 79.78% after 5,000 cycles at current density 1 A/g.

10.1149/09901.0093ecst

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Citations (4)

Electrochemical performance of composites made of rGO with Zn-MOF and PANI as electrodes for supercapacitors

Electrochimica Acta (2020)

Quoc Bao Le Thanh-Huong Nguyen Haojie Fei Irina Sapurina Fahanwi Asabuwa Ngwabebhoh

10.1016/j.electacta.2020.137563

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Citations (101)

Using tanned leather waste to derive biochars for supercapacitor electrodes in various electrolytes

Biomass Conversion and Biorefinery (2024)

Jaroslav Stejskal Haojie Fei Jarmila Vilčáková Nikhitha Joseph Petr Sáha

10.1007/s13399-024-06348-w

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Reduced Graphene Oxide-MWCNT Organogel Foam for Lithium-Sulfur Battery Cathode

ECS Transactions (2019)

Elif Vargün Haojie Fei Gengchao Wang Qilin Cheng Jarmila Vilčáková

The fabrication of self-standing porous carbon foam nanostructures for trapping sulfur in Lithium–Sulfur (Li-S) batteries was aimed in this work. Nitrogen doped reduced graphene oxide/acid treated MWCNT based cathode material was prepared and characterized by different techniques. The GO/aMWCNT organofoam nanostructures were first polymerized in-situ with aniline and pyrrole and then carbonized at 800°C under argon atmosphere. The purpose of the carbonization was to improve the conductivity of the carbon matrix and dope it with nitrogen using PANI and PPy as a nitrogen source. N-doped rGO/aMWCNT foams exhibited the three dimensional porous network morphology and high conductivity (3.06 S.cm-1). The sulfur was infiltrated to the foams by melt diffusion method and the highest sulfur content of the rGO/aMWCNT-S composite was found as 61.3 wt. %.

Carbon fibers

Lithium–sulfur battery

10.1149/09501.0081ecst

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Citations (1)

Effect of PANI and PPy on Electrochemical Performance of rGO/ZnMn2O4 Aerogels as Electrodes for Supercapacitors

Journal of Electronic Materials (2020)

Quoc Bao Le Elif Vargün Haojie Fei Qilin Cheng Constantin Bubulinca

Polypyrrole

In situ polymerization

Horizontal scan rate

10.1007/s11664-020-08198-4

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Citations (19)

In situ preparation of bacterial cellulose reinforced hydrogel electrolyte for flexible supercapacitors

Haojie Fei Nabanita Saha Oyunchimeg Zandraa Robert Moučka Natalia E. Kazantseva

Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2016/003]; Open Project of Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology; Ministry of Education, Youth, and Sports of the Czech Republic [LH 14273]

Christian ministry

Bacterial Cellulose

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Nanoparticle-Based Rifampicin Delivery System Development

Molecules (2021)

Marjan Motiei Luís F. Gouveia Tomáš Šopík Robert Vícha David Škoda

The alkaline milieu of chronic wounds severely impairs the therapeutic effect of antibiotics, such as rifampicin; as such, the development of new drugs, or the smart delivery of existing drugs, is required. Herein, two innovative polyelectrolyte nanoparticles (PENs), composed of an amphiphilic chitosan core and a polycationic shell, were synthesized at alkaline pH, and in vitro performances were assessed by 1H NMR, elemental analysis, FT-IR, XRD, DSC, DLS, SEM, TEM, UV/Vis spectrophotometry, and HPLC. According to the results, the nanostructures exhibited different morphologies but similar physicochemical properties and release profiles. It was also hypothesized that the simultaneous use of the nanosystem and an antioxidant could be therapeutically beneficial. Therefore, the simultaneous effects of ascorbic acid and PENs were evaluated on the release profile and degradation of rifampicin, in which the results confirmed their synergistic protective effect at pH 8.5, as opposed to pH 7.4. Overall, this study highlighted the benefits of nanoparticulate development in the presence of antioxidants, at alkaline pH, as an efficient approach for decreasing rifampicin degradation.

10.3390/molecules26072067

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Citations (19)

Synthesis and Characterization of Graphene Oxide from Residual Biomass

2022 IEEE 12th International Conference Nanomaterials: Applications & Properties (NAP) (2022)

Adam Aberra Challa Nabanita Saha Fahanwi Asabuwa Ngwabebhoh Hau Trung Nguyen Pavel Urbánek

Graphene oxide (GO) is a member of the graphene family that is intensively used in many fields such as electronics, environmental protection, and biomedical applications. GO is mainly produced from commercially available graphite powder. In this study, however, GO was synthesized from alternative carbon-rich biomass residues that are readily available: spent tea leaves, and coffee waste. These residues were treated with dilute HCl to remove impurities and then soaked in NaOH to activate their carbon. Highly porous GO nanomaterials were successfully synthesized using the modified Hummer's method after pyrolysis of the biomasses at a moderate temperature. These nanomaterials were characterized using FTIR, Raman spectroscopy, SEM, and XRD. FTIR results indicated the removal of oxygen (C-O and O-H bonds), carboxyl, carbonyl, carboxylic, and epoxy functional groups from the biomass through pyrolysis. Raman spectroscopy of the GO particles revealed the extent of the oxidation process. SEM images showed vascular-shaped graphene layers with porous and semi-porous surfaces. X-ray diffraction patterns showed an amorphous shape. The properties of the synthesized GO particles were compared with GO produced from the conventional source: graphite. The results indicated considerable similarities. Hence, biomass residuals can be considered a viable, environmentally-friendly source for GO.

Nanomaterials

Graphite oxide

Carbon fibers

10.1109/nap55339.2022.9934117

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Citations (1)

Polyaniline/reduced graphene oxide hydrogel film with attached graphite current collector for flexible supercapacitors

Journal of Materials Science Materials in Electronics (2017)

Haojie Fei Nabanita Saha Natalia E. Kazantseva Tatiana Babkova Michal Machovský

Current collector

Graphite oxide

10.1007/s10854-017-8233-3