Electric Conductive Composites Based on Metal Oxides and Carbon Nanostructures
Ol. D. Zolotarenko1, E. P. Rudakova2, N. Y. Akhanova3,4, An. D. Zolotarenko2, D. V. Shchur2, M. T. Gabdullin3, M. Ualkhanova4, N. A. Gavrylyuk1, M. V. Chymbai2, Yu. O. Tarasenko1, I. V. Zagorulko5, A. D. Zolotarenko2
1O. O. Chuiko Institute of Surface Chemistry, NAS of Ukraine, 17 General Naumov Str., UA-03164 Kyiv, Ukraine
2I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine
3Kazakh-British Technical University, 59 Tole bi, 050000 Almaty, Republic of Kazakhstan
4Al-Farabi Kazakh National University, 71 Al-Farabi Ave., 050040 Almaty, Republic of Kazakhstan
5G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 20.07.2021. Download: PDF
Electrically conductive carbon-oxide composites based on Al2O3 and TiO2, intended for 3D printing (CJP), are obtained, and the dependences of the obtained composites conductivity on the preparation conditions and types of used carbon nanostructures (CNS) are investigated. The structure and phase composition of the samples are studied by transmission electron microscopy, and their surface is studied using a field emission scanning electron microscope. The electrical conductivity of the materials is determined with a potentiostat using. The optimal conditions for the formation of composites based on Al2O3 or TiO2 oxides with CNSs and nanofibers by processing mixtures in a planetary ball mixer, which would be ideal for preparing materials for 3D printing (CJP), have been determined. The dependence of the electrical conductivity of composites on the content of carbon nanomaterials (1–5% wt.) has been established. It is shown that the addition of 3 wt.% CNTs to oxides leads to a sharp increase in electrical conductivity from 5.0⋅10−8 to 2.8⋅10−4 S/cm for Al2O3 and from 5.0⋅10−6 to 2.2⋅10−2 S/cm for TiO2. It has been proved that composites based on carbon monoxide are promising carriers for catalysts for electrode processes in electrochemical devices. It is revealed that the Pt/TiO2–CNT catalyst with a CNT content of 5% wt. has the best catalytic activity in the reduction of oxygen in the fuel cell cathode simulating the electrode. 3D printing technology (CJP) of an electrically conductive composite (ceramics-CNT) can be used to modify of ceramic fuel cells. In addition, the use of CJP technology will allow to reduce the production cost of electrodes for fuel cells. A composite with 5% wt. CNTs is the most effective. A composite with a CNT content of 3% wt. has a smaller number of extended carbon structures, which ensures the transfer of electrons, and in samples with 15% wt. and 50% wt. CNTs, the low efficiency of the Pt catalyst may be associated with difficulties in contacting the reaction environment due to large amount of carbon material.
Key words: carbon nanostructures, carbon-ceramic nanocomposites (Al2O3 and TiO2), electrical conductivity, catalytic activity, Pt/TiO2–СNT, CJP 3D printing.
URL: https://mfint.imp.kiev.ua/en/abstract/v43/i10/1417.html
DOI: https://doi.org/10.15407/mfint.43.10.1417
PACS: 61.46.Fg, 62.23.Hj, 62.23.Pq, 81.20.Wk, 82.45.Xy
Citation: Ol. D. Zolotarenko, E. P. Rudakova, N. Y. Akhanova, An. D. Zolotarenko, D. V. Shchur, M. T. Gabdullin, M. Ualkhanova, N. A. Gavrylyuk, M. V. Chymbai, Yu. O. Tarasenko, I. V. Zagorulko, and A. D. Zolotarenko, Electric Conductive Composites Based on Metal Oxides and Carbon Nanostructures, Metallofiz. Noveishie Tekhnol., 43, No. 10: 1417—1430 (2021) (in Ukrainian)