Synthesis of nitrogen-doped graphene supported Pt nanoparticles catalysts and their catalytic activity for fuel cells

Sun, Qizhong; Kim, Seok

doi:10.1016/j.electacta.2014.11.077

Cited by 58 publications

(24 citation statements)

References 37 publications

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“…The peaks at 2928 cm −1 , 1384 cm −1 and 1216 cm −1 correspond to the symmetric stretching of C-H bond and stretching vibration bond of C-OH in bagassederived carbon materials, respectively. 37,38 The distinct and wide peak between 3000 cm −1 and 3700 cm −1 manifests the presence of C-H stretching vibration of hydroxyl groups in water. 37 For the samples of NBC and NBC/Pt, the peak between 3000 cm −1 and 3700 cm −1 is assigned to not only O-H but also N-H stretching vibrations.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped Bagasse-Derived Carbon/ Low Pt Composite as Counter Electrodes for High Efficiency Dye-Sensitized Solar Cell

Xiang

Okonkwo

et al. 2017

J. Electrochem. Soc.

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N-doped bagasse-derived carbon/Pt composite (NBC/Pt) with a very low Pt loading (0.31 wt%) is synthesized by a simple and ecofriendly hydrothermal process with bagasse as the carbon precursor and investigated as the counter electrode (CE) of dye-sensitized solar cells (DSSCs). The N doping reduces Pt nanoparticles size and facilitates the dispersion of Pt nanoparticles, which promotes the strong interaction between Pt and carbon supports. The electrochemical results show that the structural feature is beneficial to improve charge transfer rate on the interface between Pt nanoparticles and carbon supports, resulting in the enhanced catalytic activity toward I − /I 3 − redox couples. Under simulated AM 1.5 G solar illumination at 100 mW cm −2 , the DSSCs with the NBC/Pt composite CE exhibit a 6.98% power conversion efficiency (PCE), which is superior to the conventional Pt (PCE = 6.08%) CE. The NBC/Pt composite is an attractive CE material that can use 2.52 x less Pt loading onto each FTO substrate than the conventional Pt CE, which is advantageous over the high cost Pt for the fabrication of DSSCs.

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Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped Bagasse-Derived Carbon/ Low Pt Composite as Counter Electrodes for High Efficiency Dye-Sensitized Solar Cell

Xiang

Okonkwo

et al. 2017

J. Electrochem. Soc.

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“…Nitrogen functional groups and more defects on N-GNS (according to Raman results) act as anchoring sites increasing the interaction between support and metal precursor and preventing metal particles agglomeration and sintering. This phenomenon leads to smaller particle size and better dispersion [25].…”

Section: Catalyst Characterizationmentioning

confidence: 98%

Loading and promoter effects on the performance of nitrogen functionalized graphene nanosheets supported cobalt Fischer-Tropsch synthesis catalysts

Tavasoli

Asghari

Signoretto

2019

International Journal of Hydrogen Energy

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The effects of nitrogen functional groups on graphene surface and also the effects of cobalt loading and ruthenium promoter on the performance of nitrogen functionalized graphene nanosheets (N-GNS) supported cobalt catalysts in FischereTropsch synthesis (FTS) are investigated. A 15 wt% Co/PGNS catalyst, a series of Co/N-GNS (15e30 wt% loading) and ruthenium promoted catalysts (25 wt% Co,0.5 wt% Ru/N-GNS and 25 wt% Co,0.5 wt% Ru/ PGNS) were prepared by impregnation method. The purified GNS and functionalized GNS and all catalysts were characterized by Raman spectroscopy, FTIR, SEM, EDS, ICP, BET, TEM, XRD and TPR. The catalysts assessed in FTS in a fixed bed micro-reactor at 220 C, 1.8 Mpa and H 2 /CO ratio of 2. Functionalization of GNS shifted the TPR reduction peaks to lower temperature, increased the dispersion of cobalt particles and increased the percentage CO conversion from 70.6% to 74.5%. Increasing the cobalt loading resulted in increasing the average cobalt cluster size, improvements in the reducibility of Co 3 O 4. The maximum FTS activity for N-GNS supported catalyst is achieved at 30 wt % cobalt loading. The C þ 5 selectivity for the 30 wt % cobalt catalyst was higher than that of the 15 wt % Cobalt catalyst. Addition of 0.5 wt%Ru increased the FTS rate (gCH/(gcat$h)) from 0.377 to 0.412 and the liquid products selectivity from 86.5% to 91.2%.

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“…Sun et al. reported a Pt nanocomposite supported on N‐doped graphene (Pt/NG) and studied its catalytic activity for MOR . First, NG was prepared by the pyrolysis of GO with cyanamide as the nitrogen‐containing precursor at different temperatures, followed by the dispersion of Pt NPs by using a modified chemical polyol reduction process.…”

Section: Two‐dimensional Materials As Catalyst Supportsmentioning

confidence: 99%

Two‐Dimensional Layered Materials as Catalyst Supports

Kumar

2017

ChemNanoMat

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Since the successful isolation of graphene, two-dimensional (2D) materials have attracted immense interest in contemporary chemical research owing to their unique structural and chemical properties with potentials cientific applications. Layered2 Dm aterials show differentc haracteristics from bulk 3D materials owing to significanta lterations in their electronic and structural behavior.F rom the last decade, 2D materials including grapheneh ave been extensively investigated as supports for metal nanoparticles (NPs) exhibiting excellent catalytic activity towards various chemical and electrochemical reactions.T his review focuseso nt he recent advances of graphene and other 2D layered materials as catalyst supports, their interactions with metal precursors, and catalytic applications. The catalytic behavior of metal NPs supported on 2D materials has been discussed regarding various electrochemical oxidation and reduction reactions in fuel cells as wella sn umerous organic reactions and catalytic hydrogen generation from the dehydrogenationo f hydrogen storagem aterials. We appraise that the catalytic behavior of the nanomaterials can be improved by simply modifying the interactions between precursors and supports by changing the chemical and physical properties of the support materials. Finally,w es ummarize the review with an outlooko nf uture opportunities and challenges of 2D materials to provide access to av ariety of low-costa nd high-performance catalysts in terms of both academic and industrial applications.

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Synthesis of nitrogen-doped graphene supported Pt nanoparticles catalysts and their catalytic activity for fuel cells

Cited by 58 publications

References 37 publications

Nitrogen-Doped Bagasse-Derived Carbon/ Low Pt Composite as Counter Electrodes for High Efficiency Dye-Sensitized Solar Cell

Nitrogen-Doped Bagasse-Derived Carbon/ Low Pt Composite as Counter Electrodes for High Efficiency Dye-Sensitized Solar Cell

Loading and promoter effects on the performance of nitrogen functionalized graphene nanosheets supported cobalt Fischer-Tropsch synthesis catalysts

Two‐Dimensional Layered Materials as Catalyst Supports

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