Effect of graphene sheets on the physicochemical properties of nanocrystallite ceria

Currently, replacing expensive and short-lived materials for supercapacitors based on RuO with more cost-effective and high-performance materials that remain operational after a large number of cycles is a challenge. Cerium-based materials are the most attractive alternative because of the cerium ability to quickly change oxidation state. This work proposes the synthesis of nanostructured graphene-ceria composite and studies its morphological features arising under the impact of oxygen-free graphene. The mechanism of formation of nano-ceria crystallites when the sol-gel transition occurs on the surface of graphene sheets is also considered. It has been proven that the addition of 0.5–0.6 wt.% graphene sheets ensures that nano-ceria is single-phase, while simultaneously increasing its dispersity. Using the dilatometry method, it has been determined that uniformly distributed sheets of oxygen-free graphene leads to a decrease in temperature of the beginning of composite sintering by 175°C..., The dataset was collected through experiments conducted by the co-authors. Their interpretation was carried out during the discussion., , # Effect of Graphene Sheets on the Physicochemical Properties of Nanocrystallite Ceria

[https://doi.org/10.5061/dryad.r2280gbmr](https://doi.org/10.5061/dryad.r2280gbmr)

## Description of the data and file structure

Materials are intended for reviewers of the article. 

The files present the primary experimental results and characterization protocols for the synthesized samples.

All files refer to the samples of pure ceria nanopowder and its analogue with a graphene additive.

Designation of samples:

CeO2 – nanopowder of pure ceria

Graphene-CeO2 ─ ceria nanopowder with graphene additive

XRD - x-ray diffraction

TEM – transmission electron microscopy

HRTEM – high resolution TEM

SAED – selected area electron diffraction

EELS - electron energy loss spectroscopy

EDS – energy dispersive spectrometry

**Figure 1.** TEM data for a graphene suspension in DMOA-aqua: a - bright-field image of the sheet, b, c – SAED on the different regions of a sheet, shown in a.

The morphology of the...,