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. 2021 Jan 28;11(1):2532.
doi: 10.1038/s41598-020-80472-1.

The loading effect of Pt clusters on Pt/graphene nano sheets catalysts

Rikson Siburian  1   2 , Ab Malik Marwan Ali  3 , Kerista Sebayang  4   5 , Minto Supeno  6   4 , Kerista Tarigan  4   7 , Crystina Simanjuntak  6 , Sri Pratiwi Aritonang  6 , Fajar Hutagalung  6
Affiliations

The loading effect of Pt clusters on Pt/graphene nano sheets catalysts

Rikson Siburian et al. Sci Rep. .

Abstract

In this paper, we report about chemically interaction between Pt Subnano-Clusters on Graphene Nano Sheets (GNS). The aim of this research is to clarify the size effect of Pt clusters on Pt 1-7 wt.%/GNS. This research is an experimental laboratory research. GNS was synthesized by using modified Hummer's method and 1-7 wt.% Pt/GNS were prepared with impregnation method. Then, they were analyzed with TG/DTA, XRD, TEM and XPS, respectively. The results show that Pt clusters are well deposited on GNS (TG/DTA and TEM data). Those data also are consistent with XRD data. The weak and broad peaks appear at 2θ = 39°, indicating Pt metal exists on GNS. The state of Pt is confirmed by using XPS. The appearance of Pt 4f. peaks proves that Pt metal is chemical interaction on GNS. The size of Pt clusters may affect the chemically properties of Pt/GNS catalysts.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
TG/DTA thermograms for 1–7 wt.% Pt/GNS.
Figure 2
Figure 2
Pt amount on GNS (wt.%) measured by TG/DTA versus calculated Pt amount on GNS (□).
Figure 3
Figure 3
XRD patterns of 1–7 wt.% Pt/GNS.
Figure 4
Figure 4
TEM images and histograms of 1–7 wt.% Pt /GNS.
Figure 5
Figure 5
Average Pt particle size (nm) estimated by TEM versus Pt amount on GNS.
Figure 6
Figure 6
XPS spectra of 1–7 wt.% Pt/GNS (Wide Scans).
Figure 7
Figure 7
XPS Pt spectra of 1–7 wt.% Pt/GNS (Narrow Scans).
Figure 8
Figure 8
Graph current density and CO tolerance vs Pt loading on GNS (wt.%) (CV measurement).
Figure 9
Figure 9
Cyclic voltammograms for the ORR using a Pt 1–7 wt.% Pt/GNS catalysts in the absence of O2 or under conditions of O2 saturation; Rotating ring-disk voltammogram (500 rpm) 0.1 mol dm−3 HClO4, scan rate 10 mVs−1 of the ORR.
Figure 10
Figure 10
Graph mass activity vs Pt loading on GNS (wt.%) (CV measurement).
Figure 11
Figure 11
Polarization curves of ECSAH for 1–7 wt.% Pt/GNS on a rotating disk electrode (RDE) measured in 0.1 mol dm−3 HClO4 at 60 °C, where H2 gas is bubbled. Rotating speed 500 rpm and scan rate 10mVs−1 between—0.20 and 0.1 vs Ag/AgCl.
Figure 12
Figure 12
CO stripping voltammogram of 1–7 wt.% Pt/GNS, respectively on a rotating disk electrode (RDE) measured in 0.1 mol dm−3 HClO4 at 60 °C. Rotating speed 500 rpm and scan rate of 10 mVs−1 between—0.20 and 0.8 vs Ag/AgCl.
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