Pyridinic Nitrogen‐Doped Graphene Nanoshells Boost the Catalytic Efficiency of Palladium Nanoparticles for the <i>N</i>‐Allylation Reaction

Li, Xinxin; Feng, Xiang; Pan, Liqing; Wu, Zhuangzhuang; Wu, Xiling; Ma, Tianwen; Li, Jialiang; Pan, Yuanyuan; Song, Yan; Wu, Mingbo

doi:10.1002/cssc.201802532

Cited by 18 publications

(11 citation statements)

References 49 publications

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“…The counter electrode was a large area platinum foil (2 cm 2 ), while the reference was an Ag/AgCl electrode (3 M KCl). The CV and LSV measurements were generally run from −0.2 to + 0.8 V vs. Ag/AgCl, at various scan rates (2,5,10,15,20,30,40 and 50 mV•s −1 ). The EIS spectra were recorded over 0.1-10 6 Hz range (10 mV amplitude excitation signal) at the peak potential of each electrode, and the experimental data were fitted using Nova 1.11 software (Metrohm-Autolab B.V., Utrecht, The Netherlands).…”

Section: Instrumentsmentioning

confidence: 99%

“…Doping graphene with heteroatoms such as nitrogen [4,5], boron [6,7], sulfur [8,9] or halogens [10,11] can adjust the electronic and electrochemical properties of the material leading to enhanced performances. Among the heteroatoms, nitrogen has drawn a lot of attention due to the significantly improved properties of the N-graphene as part of fuel cells [12], lithium ion batteries [13], supercapacitors [14] or advanced catalyst support [15,16]. Nitrogen doping can be achieved using different approaches: mixing graphene with nitrogen containing precursor and thermal annealing [17,18]; thermal exfoliation of graphite oxide in ammonia atmosphere [19]; solvothermal or hydrothermal methods using graphene oxide and Shift base precursors [20][21][22], chemical vapor deposition [23] or microwave plasma [24].…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Coroș

Varodi

Pogăcean

et al. 2020

Sensors

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Three nitrogen-doped graphene samples were synthesized by the hydrothermal method using urea as doping/reducing agent for graphene oxide (GO), previously dispersed in water. The mixture was poured into an autoclave and placed in the oven at 160 °C for 3, 8 and 12 h. The samples were correspondingly denoted NGr-1, NGr-2 and NGr-3. The effect of the reaction time on the morphology, structure and electrochemical properties of the resulting materials was thoroughly investigated using scanning electron microscopy (SEM) Raman spectroscopy, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), elemental analysis, Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS). For NGr-1 and NGr-2, the nitrogen concentration obtained from elemental analysis was around 6.36 wt%. In the case of NGr-3, a slightly higher concentration of 6.85 wt% was obtained. The electrochemical studies performed with NGr modified electrodes proved that the charge-transfer resistance (Rct) and the apparent heterogeneous electron transfer rate constant (Kapp) depend not only on the nitrogen doping level but also on the type of nitrogen atoms found at the surface (pyrrolic-N, pyridinic-N or graphitic-N). In our case, the NGr-1 sample which has the lowest doping level and the highest concentration of pyrrolic-N among all nitrogen-doped samples exhibits the best electrochemical parameters: a very small Rct (38.3 Ω), a large Kapp (13.9 × 10−2 cm/s) and the best electrochemical response towards 8-hydroxy-2′-deoxyguanosine detection (8-OHdG).

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Section: Instrumentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Coroș

Varodi

Pogăcean

et al. 2020

Sensors

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“…Thisis ascribed to the change in the environment when nitrogen is not the only dopant in the carbon matrix. Pyridinic and pyrrolic functionalities are advantageous for many applications such as oxygen reduction reaction (ORR) [43], catalysis [49] and supercapacitors [50]. Doping with nitrogen increases the charge density of neutral carbon atoms that consequently increase the overall reactivity of the PNDC surface [33,51].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Renewable Tannin-Based Dual-Doped Carbon Material and its Application as a Supercapacitor Electrode Material

2019

Cur Res Mater Chem

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“…Nanocarbon materials are promising candidates for this kind of SIB electrode materials owing to their merits of good conductivity, high structural variability, low cost, high specific surface area, and mechanical robustness. Besides, functional groups can also be easily produced on the surfaces of nanocarbon materials through heteroatom doping . Among various nanocarbon materials, graphene exhibits overwhelming advantages because of its high surface area (2620 m 2 g −1 ), high conductivity, and high structural variability, which are highly favorable for storing more Na + with high rate.…”

Section: Introductionmentioning

confidence: 99%

Capacitive Sodium‐Ion Storage Based on Double‐Layered Mesoporous Graphene with High Capacity and Charging/Discharging Rate

et al. 2019

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Sodium‐ion batteries (SIBs) are regarded as an ideal alternative to lithium‐ion batteries, but the larger radius of Na+ compared with Li+ results in lower energy density, shorter cycle life, and sluggish kinetics of SIBs. Therefore, it is of significant importance to explore appropriate Na+ storage materials with high capacity and fast Na+ transport kinetics. Herein, doublelayered mesoporous graphene nanosheets codoped with oxygen and nitrogen (O,N‐MGNSs) were developed as a new cathode material with high Na+ storage capacity and fast ion‐transport kinetics for SIBs. The codoping of MGNSs with oxygen and nitrogen by in situ chemical vapor deposition endowed them with a hierarchical porous network, robust structures, good conductivity, and abundant functional groups. The O,N‐MGNSs could host Na+ in two ways: surface adsorption and surface redox reaction, and this endowed them with high Na+ storage capacity and fast charging/discharging rates in SIBs. Electrochemical results revealed that the O,N‐MGNSs delivered a reversible capacity of 156 mAh g−1 at a current density of 0.5 A g−1 (corresponding to a rate of 3 C) between 1.5 and 4.2 V and exhibited a high cycling stability (95 % capacity retention at 1 A g−1 for more than 1000 cycles).

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Pyridinic Nitrogen‐Doped Graphene Nanoshells Boost the Catalytic Efficiency of Palladium Nanoparticles for the N‐Allylation Reaction

Abstract: Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 18 publications

References 49 publications

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Renewable Tannin-Based Dual-Doped Carbon Material and its Application as a Supercapacitor Electrode Material

Capacitive Sodium‐Ion Storage Based on Double‐Layered Mesoporous Graphene with High Capacity and Charging/Discharging Rate

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