Wyniki wyszukiwania - BazTech

1

Graphene oxide-multiwalled carbon nanotubes composite as an anode for lithium ion batteries

Majchrzycki Ł., Walkowiak M., Martyła A., Yablokov M. Y., Nowicki M., Czajka R.

Materials Science Poland

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2016

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Vol. 34, No. 3

481--486

EN

Nowadays reduced graphene oxide (rGO) is regarded as a highly interesting material which is appropriate for possible applications in electrochemistry, especially in lithium-ion batteries (LIBs). Several methods were proposed for the preparation of rGO-based electrodes, resulting in high-capacity LIBs anodes. However, the mechanism of lithium storage in rGO and related materials is still not well understood. In this work we focused on the proposed mechanism of favorable bonding sites induced by additional functionalities attached to the graphene planes. This mechanism might increase the capacity of electrodes. In order to verify this hypothesis the composite of non-reduced graphene oxide (GO) with multiwalled carbon nanotubes electrodes was fabricated. Electrochemical properties of GO composite anodes were studied in comparison with similarly prepared electrodes based on rGO. This allowed us to estimate the impact of functional groups on the reversible capacity changes. As a result, it was shown that oxygen containing functional groups of GO do not create, in noticeable way, additional active sites for the electrochemical reactions of lithium storage, contrary to what has been postulated previously.

2

Problemy eksploatacyjne i uszkodzenia ogniw paliwowych

Adamiec M.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 12a

78-82

PL

W artykule opisano różne rodzaje ogniw paliwowych w aspekcie problemów eksploatacyjnych, nieprawidłowości w funkcjonowaniu i trwałych uszkodzeń. Scharakteryzowano ogniwa niskotemperaturowe, wysokotemperaturowe, z elektrolitem w roztworze wodnym i w postaci stałej. Przedstawiono wyniki badań w formie wykresów dla laboratoryjnego alkalicznego ogniwa paliwowego małej mocy. Porównano rezultaty badań wykonanych dla ogniwa nowego oraz zużytego w wyniku pięciu lat doświadczeń w różnych warunkach eksploatacyjnych.

EN

The paper describes different types of fuel cells in the aspect of operational problems, functioning irregularities and permanent damage. Low-temperature and high-temperature fuel cells with electrolyte in water solution and in solid form were characterized. The paper presents the results of the research in form of charts for laboratory low power alkaline fuel cell. Results of the research made for new cell as well as for damaged cell in result of five years of experiments in different conditions were compared.

3

Otrzymywanie elektrody żelaznej na drodze utleniania i redukcji proszku żelaza z dodatkiem węgla

Jaroń A., Żurek Z.

Czasopismo Techniczne. Chemia

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2005

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R. 102, z. 7-Ch

25--31

PL

W niniejszym artykule przedstawiono wyniki badań nad otrzymaniem porowatych elektrod żelaznych wskutek utleniania/redukcji złoża proszkowego modyfikowanego dodatkiem węgla. Proces utleniania prowadzono w atmosferze powietrza, natomiast redukcję w wodorze. Obydwa procesy prowadzono w temp. 600°C. Badane elektrody charakteryzowano z użyciem metod: TG, SEM, EDX. Właściwości elektrochemiczne określono przez pomiary potencjostatyczne. W wyniku przeprowadzonych badań określono temperaturę i czas niezbędny do otrzymania mechanicznie stabilnych, porowatych elektrod żelaznych oraz stwierdzono sześciokrotny wzrost gęstości prądu na elektrodach porowatych w stosunku do gładkiej elektrody żelaznej.

EN

In this paper methods of receiving porous iron electrode on the way of oxidation and reduction of iron powder bed modified with supplement of coal were described. The oxidation process was lead up in air the reduction took place in H2. Both processes were being led at 600°C. The samples were examined by: TG, SEM and EDX methods. Electrochemical properties were determined on the way of potentiostatic measurements. In result of investigation the optimal temperature and time for receiving mechanically stable porous iron was appointed. A six-time increase in density of electricity was found on porous electrodes in the relation to the smooth iron electrode.