Electric Conductive Composites Based on Metal Oxides and Carbon Nanostructures

Zolotarenko O.D. Rudakova E.P. Akhanova N.Y. Zolotarenko A.D. Shchur D.V. Gabdullin M.T. Ualkhanova M. Gavrylyuk N.A. Chymbai M.V. Tarasenko Yu.O. Zagorulko I.V. Zolotarenko A.D.
2021 G.V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine

Metallofizika i Noveishie Tekhnologii
2021 #43 Issue 10 1417 - 1430 pp.

Electrically conductive carbon-oxide composites based on Al2O3 and TiO2, in-tended for 3D printing (CJP), are obtained, and the dependences of the ob-tained 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 micro-scope. The electrical conductivity of the materials is determined with a po-tentiostat using. The optimal conditions for the formation of composites based on Al2O3 or TiO2 oxides with CNSs and nanofibers by processing mix-tures in a planetary ball mixer, which would be ideal for preparing materials for 3D printing (CJP), have been determined. The dependence of the electri-cal 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 ox-ides 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 carri-ers 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 sim-ulating the electrode. 3D printing technology (CJP) of an electrically conduc-tive 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 effec-tive. A composite with a CNT content of 3% wt. has a smaller number of ex-tended carbon structures, which ensures the transfer of electrons, and in samples with 15% wt. and 50% wt. CNTs, the low efficiency of the Pt cata-lyst may be associated with difficulties in contacting the reaction environ-ment due to large amount of carbon material.

Carbon nanostructures , Carbon-ceramic nanocomposites (Al2O3 and TiO2) , Catalytic activity , CJP 3D printing , Electrical conductivity , Pt/TiO2–СNT

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Chuiko Institute of Surface Chemistry, N.A.S. of Ukraine, 17 General Naumov Str, Kyiv, 03164, Ukraine
I. M. Frantsevich Institute for Problems in Materials Science, N.A.S. of Ukraine, 3 Academician Krzhyzhanovsky Str, Kyiv, UA-03142, Ukraine
G. V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Academician Vernadsky Blvd, Kyiv, UA-03142, Ukraine
Kazakh-British Technical University, 59 Tole bi Str, Almaty, 050000, Kazakhstan
Al-Farabi Kazakh National University, 71 Al-Farabi Ave, Almaty, 050040, Kazakhstan

Chuiko Institute of Surface Chemistry
I. M. Frantsevich Institute for Problems in Materials Science
G. V. Kurdyumov Institute for Metal Physics
Kazakh-British Technical University
Al-Farabi Kazakh National University

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