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

Siburian, Rikson; Ali, Abdul Karim; Sebayang, Kerista; Supeno, Minto; Tarigan, Kerista; Simanjuntak, Crystina; Aritonang, Sri Pratiwi; Hutagalung, Fajar

doi:10.1038/s41598-020-80472-1

Cited by 21 publications

(13 citation statements)

References 46 publications

(37 reference statements)

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“…X-ray photoelectron spectroscopy (XPS) measurements in Figure g showed a difference in binding energy for reduced Pt on graphene, with Pt 4f 5/2 at 74.6 eV and Pt 4f 7/2 at 71.3 eV when compared to reduced Pt on Si samples, with Pt 4f 5/2 at 74.3 eV and Pt 4f 7/2 at 70.9 eV. The 0.3 to 0.4 eV shift in binding energy has been attributed to enhanced interaction in the Pt–C due to the C π*–Pt d hybridization only observable in low loadings of Pt nanoparticles. , This Pt–C interaction, detectable only after reduction, should allow for improved modulation of electron density of the Pt clusters. These observations, as well as height profiles obtained from the scanning tunneling microscopy (STM) image in Figures h and S8, are consistent with a thin discontinuous layer of Pt nanoclusters 2–4 nm in height on a continuous layer of graphene.…”

Section: Resultsmentioning

confidence: 99%

Platinum Graphene Catalytic Condenser for Millisecond Programmable Metal Surfaces

et al. 2022

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Accelerating catalytic chemistry and tuning surface reactions require precise control of the electron density of metal atoms. In this work, nanoclusters of platinum were supported on a graphene sheet within a catalytic condenser device that facilitated electron or hole accumulation in the platinum active sites with negative or positive applied potential, respectively. The catalytic condenser was fabricated by depositing on top of a p-type Si wafer an amorphous HfO 2 dielectric (70 nm), on which was placed the active layer of 2−4 nm platinum nanoclusters on graphene. A potential of ±6 V applied to the Pt/graphene layer relative to the silicon electrode moved electrons into or out of the active sites of Pt, attaining charge densities more than 1% of an electron or hole per surface Pt atom. At a level of charge condensation of ±10% of an electron per surface atom, the binding energy of carbon monoxide to a Pt(111) surface was computed via density functional theory to change 24 kJ mol −1 (0.25 eV), which was consistent with the range of carbon monoxide binding energies determined from temperature-programmed desorption (ΔBE CO of 20 ± 1 kJ mol −1 or 0.19 eV) and equilibrium surface coverage measurements (ΔBE CO of 14 ± 1 kJ mol −1 or 0.14 eV). Impedance spectroscopy indicated that Pt/graphene condensers with potentials oscillating at 3000 Hz exhibited negligible loss in capacitance and charge accumulation, enabling programmable surface conditions at amplitudes and frequencies necessary to achieve catalytic resonance.

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Section: Resultsmentioning

confidence: 99%

Platinum Graphene Catalytic Condenser for Millisecond Programmable Metal Surfaces

et al. 2022

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“…The absence of characteristic Pt peaks in the sample Pt/Li-GR is probably due to the low Pt mass loading in the generated Pt/Li-GR sample. In the literature, F. Hutagalung et al reported that the Pt XRD peaks are not visible for a Pt supported carbon with a metal loading below 1 wt% [44]. Besides, Raman spectroscopy is a convenient method for investigating insertion materials process [45].…”

Section: Resultsmentioning

confidence: 99%

Metal-supported cathodically activated graphite via self-reduction as electrocatalysts for efficient hydrogen evolution reaction

Ghilane

2022

Materials Today Chemistry

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“…X-ray photoelectron spectroscopy (XPS) results prove that Pt metal is the main component of the catalyst (Figure S3, Supporting Information). [37] 2.2. Carrier Transport and Light Management on Quartz Glass/Perovskite/Silicon Photoelectrode A schematic highlighting the structure and energy band diagram of quartz glass-protected perovskite/silicon-based photocathode is displayed in Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

“…X‐ray photoelectron spectroscopy (XPS) results prove that Pt metal is the main component of the catalyst (Figure S3, Supporting Information). [ 37 ]…”

Section: Resultsmentioning

confidence: 99%

Integrated and Unassisted Solar Water‐Splitting System by Monolithic Perovskite/Silicon Tandem Solar Cell

Wang¹,

Shi²,

Zhang³

et al. 2021

Solar RRL

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Photoelectrochemical (PEC) water splitting to hydrogen is a clean process that can achieve green hydrogen. However, the integrated PEC devices have some problems, such as serious incident light loss, poor stability, and high cost. Here, the low‐cost perovskite/silicon tandem cell instead of the costly III−V tandem cell as the light absorber is used, combined with high‐transmittance quartz glass as a protective layer forming an unassisted solar water‐splitting device. Quartz glass can minimize incident light loss and prevent electrolyte corrosion of solar cells. A solar‐to‐hydrogen efficiency of 19.68% is achieved, and the performance can be maintained for 20 h without noticeable change. This structure design provides a novel integrated solar water‐splitting system.

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

Cited by 21 publications

References 46 publications

Platinum Graphene Catalytic Condenser for Millisecond Programmable Metal Surfaces

Platinum Graphene Catalytic Condenser for Millisecond Programmable Metal Surfaces

Metal-supported cathodically activated graphite via self-reduction as electrocatalysts for efficient hydrogen evolution reaction

Integrated and Unassisted Solar Water‐Splitting System by Monolithic Perovskite/Silicon Tandem Solar Cell

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