Experimental data of four-point probe, scanning electron microscopy, and near-edge X-ray fine structure of titanium (IV) isopropoxide and zirconium (IV) dioxide binders incorporated carbon-based counter electrode for dye-sensitized solar cells

In this article, we present the data collected from the fabricated carbon black-graphite counter electrode for dye-sensitized solar cells (DSSC) by incorporating binders such as titanium (IV) isopropoxide (TTIP), and zirconium (IV) dioxide (ZrO2). The addition of binders to the carbon black-graphite composite (CB/Gr) can drastically improve the adherence between the counter electrodes and the fluorine-doped tin oxide (FTO) substrate, surface area and the interparticle connection between the carbon materials. These data are presented which comprise of the resistivity measurements, scanning electron microscopy (SEM) with energy dispersive X-ray (EDX), and near-edge X-ray absorption fine structure (NEXAFS). The collection of this data was performed at room temperature. Detailed analysis of the data can be found in [1].


a b s t r a c t
In this article, we present the data collected from the fabricated carbon black-graphite counter electrode for dyesensitized solar cells (DSSC) by incorporating binders such as titanium (IV) isopropoxide (TTIP), and zirconium (IV) dioxide (ZrO 2 ). The addition of binders to the carbon blackgraphite composite (CB/Gr) can drastically improve the adherence between the counter electrodes and the fluorinedoped tin oxide (FTO) substrate, surface area and the interparticle connection between the carbon materials. These data are presented which comprise of the resistivity measurements, scanning electron microscopy (SEM) with energy dispersive X-ray (EDX), and near-edge X-ray absorption fine structure (NEXAFS). The collection of this data was DOI

Value of the Data
• This data provides resistivity, SEM, and NEXAFS that can be used to investigate the effect of binders on low-cost CB/Gr counter electrodes on the surface adherence, conductivity and electrochemical activity for DSSC. • Research on carbon-based counter electrodes can benefit from these data for experimental and validation which led to good adherence, high conductivity, high electrochemical activity, and low-cost counter electrodes for DSSC. It was imperative that binders provide good bonding among the carbon materials in the counter electrode and also between the counter electrode and FTO substrate interface to obtain improved photovoltaic performance of the device. • Research on the addition of TTIP to CB/Gr counter electrodes that subsequently forms titanium dioxide (TiO 2 ) in situ will give the potential for future work. The NEXAFS data from this article offer the possibility to engineer and optimize the energy levels of the counter electrode in order to acquire a high-performing DSSC. • Meanwhile, conductivity data indicates the bonding between the carbon black and graphite in counter electrodes which is relatively influenced by the properties of the binders. • Different binders with different particle sizes are utilized as the particle size of the binders can affect the performance of the counter electrodes. In this work, the particle size of TiO 2 is measured using SEM.
• Identical data collection procedure was followed on all the fabricated counter electrodes; to ensure fair comparison of results from each binder.

Data Description
There are three levels of data included in this paper. The first level is the resistivity measurements of CB/Gr counter electrodes with different amount of TTIP and; 5 μm and 0.22 μm particle sizes of ZrO 2 binders added. The resistivity and conductivity of the fabricated counter electrodes are summarized in Table 1 .
The second level provides scanning electron microscopy with energy dispersive X-ray (SEM-EDX) images of side-view of CB/Gr:TTIP (see Fig. 1 ), and SEM images of top-view of CB/Gr:ZrO 2 (0.22 μm) and CB/Gr:ZrO 2 (5 μm) counter electrodes as shown in Fig. 2 .   Meanwhile, the third level data is the near-edge X-ray absorption fine structure, NEXAFS. This data allows the exploration of the unoccupied electronic levels of a species which lie below or at the vacuum level. C K edges as shown in Fig. 3 , which indicates the presence of excitonic states of 1s-π * and σ * in all spectra. C K edge may involve interlayer states such as π * C-O and C = O.

Experimental Design, Materials and Methods
Different amount of TTIP and ZrO 2 binders were added to the carbon black-graphite paste. Each binder also has a different particle size. TTIP binder which formed TiO 2 has a particle of ∼100 nm, while ZrO 2 binders have a particle sizes of 0.22 μm and 5 μm, respectively. Each of the binder is added to the carbon black-graphite paste and was readily mixed until the paste become homogenous. The counter electrode was fabricated on FTO substrate by doctor blade method and sintered at 400 °C for 1 h. In the four-point probe, the needles of equal spacing between each of the probes were placed on the surface of the counter electrode. Current is then applied on the outer two probes, and voltage across the inner two probes is measured. The SEM procedure were carried out using back scattered electron. The films were cut 1 cm by 1cm. Meanwhile, NEXAFS were performed at 20 °from the surface normal to analyze the binding energy of the elements. All spectra were measured at a photon energy of 600 eV, and excited photoelectrons detected in unit of counts per second were normalized with the incoming soft X-ray intensity, monitored by the drain current from the gold mesh in front of the sample. All experiments are conducted at room temperature.

Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships which have, or could be perceived to have, influenced the work reported in this article.