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Papers

Presented Papers at Scientific Conferences
Stationary and mobile applications using fuel cell and hydrogen technologies for a sustainable hydrogen economy
  • Year: 2021
Stationary and mobile applications using fuel cell and hydrogen technologies for a sustainable hydrogen economy
  • Author(s): Borislav Abrashev, Marin Pandev, Daniela Levi, Valentin Terziev

The efficient use of renewable energy sources is a key factor in the transition to a low-carbon economy. In order to be competitive with the already well-known energy systems on the market, both in-depth research is needed to increase their efficiency in the production of so-called "green" energy and innovative solutions related to its further storage. One of the most promising energy sources, on which focus is directed, is hydrogen. The storage of hydrogen in the form of metal hydride (MH) provides great opportunities for the development of modern hydrogen technologies. The use of hydrogen in MH - accumulators (batteries) is a promising path for energy supply in an environmentally friendly way. For a lot of years, MH batteries have been used in hybrid electric cars, as well as for stationary purposes such as power and emergency energy sources for households, hospitals, etc. Furthermore, hydrogen and fuel cell technologies are now regarded as one of the best ways to store energy produced by renewable power sources and additionally have a rising stationary application for combined heat and power (CHP) systems for greener households. The purpose of this presentation is to show the important role of hydrogen as an energy vector and fuel which provides a stable link between the electricity, heat and mobility sectors through a secure, competitive and sustainable energy supply.

  • Event Info: 1st International architectural sciences and applications symposium (IArcSAS- 2021), Isparta- Turkey October 27-29, 2021
Effect of the ultrasound assisted mixing of Zn active mass with different content of BSCCO (2212) ceramics additives
  • Year: 2021
Effect of the ultrasound assisted mixing of Zn active mass with different content of BSCCO (2212) ceramics additives
  • Author(s): G. Ivanova, A. Stoyanova, V. Petrova, Y. Marinov, А. Stoyanova- Ivanova

In recent years the rechargeable alkaline nickel-zinc batteries are of special interest due to their good electrochemical characteristics.The battery life is largely determined by the zinc electrode and especially – by the life of the anode mass. In our previous studies the use of B(Pb)SCCO 2212 ceramic as additive to the zinc electrode mass was investigated and its positive ef-fect on the improvement of the electrochemical properties was confirmed. The aim of the present work is to optimize the amount of B(Pb)SCCO 2212 additive, as well as the conditions of the ultrasonic treatment by 20kHz, 1200w ultrasonic lab sonicator, Hangzhou Dowell Ultrasonic Tech Co., Ltd. Its phase composition and morphology were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Zinc electrodes prepared by inserting a zinc paste with a different amount of additive B(Pb)SCCO 2212 (5, 7 and 10 wt. %) into the copper foam matrix were used as a current collector and zinc mass carrier. The conductivity of Zn electrodes was examined by electrochemical impedance spectroscopy.

  • Event Info: Ninth International Conference of FMNS “Modern Trends in Science”, 15 - 19.09.2021, Blagoevgrad, Bulgaria
Hybrid supercapacitors with innovative binder - ex-situ structural and morphological studies
  • Year: 2021
Hybrid supercapacitors with innovative binder - ex-situ structural and morphological studies
  • Author(s): B. Karamanova, P. Ublekov, Ch. Novakov, I. Dimitrov, A. Stoyanova, L. Soserov,

In this study are presented the results from ex-situ physicochemical analyz-es of electrodes with synthesized poly(vinylidene fluoride-cohexafluropropylene) (PVDF-co-HFP), used as binder in the active elec-trode mass of hybrid supercapacitors. The cells based on biogenic activated carbon, αβ-Ni(OH)2 composite electrode, ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate) as electrolyte and PVDF exhibit im-proved capacitive characteristics. The crystal structure of the electrodes are studied using X-ray diffraction analysis. The profile of pristine Ni(OH)2 electrode and this one after the electrochemical tests is similar, however, decreases in peak intensity were observed in (001) and (110) directions. In contrast, the peak intensity of (100) and (101) increased, suggesting the formation of more perfect crystals. The electrode morphology are investigat-ed by SEM and AFM analyzes.

  • Event Info: Ninth International Conference of FMNS “Modern Trends in Science”, 15 - 19.09.2021, Blagoevgrad, Bulgaria
Ab initio study on development of a BOD/COD biosensor
  • Year: 2021
Ab initio study on development of a BOD/COD biosensor
  • Author(s): Nikolay Vitanov, Elitsa Chorbadzhiyska, Mario Mitov, Yolina Hubenova,

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  • Event Info: Ninth International Conference of FMNS “Modern Trends in Science”, 15 - 19.09.2021, Blagoevgrad, Bulgaria
Reversable gas-diffusion electrodes based on carbon free materials
  • Year: 2021
Reversable gas-diffusion electrodes based on carbon free materials
  • Author(s): Emilia Mladenova, Miglena Slavova, Borislav Abrashev, Valentin Terziev, Blagoy Burdin, Gergana Raikova

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  • Event Info: 5-th International symposium on materials for energy storage and conversion mESC-IS 14-17 September 2021