Pyridinic and graphitic nitrogen-rich graphene for high-performance supercapacitors and metal-free bifunctional electrocatalysts for ORR and OER

Faisal, Shaikh Nayeem; Haque, Enamul; Noorbehesht, Nikan; Zhang, Weimin; Harris, Andrew T.; Church, Tamara L.; Minett, Andrew I.

doi:10.1039/c7ra01355h

Cited by 131 publications

(68 citation statements)

References 75 publications

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“…Carbon (Figure C), nitrogen (Figure D) and oxygen (Figure E) were also observed besides nickel (Figure F). The peaks for C and N correspond to NGr, and the peak for oxygen was ascribed to incomplete reduction of GO to NGr …”

Section: Resultsmentioning

confidence: 83%

“…The hump at 3180 cm −1 is due to the overtone of D / (2D / ) band ,. For the Ni‐NGr composite, the intensity ratio of D‐peak to G‐peak (I D /I G ), representing the defect density of carbon is 1.03, which is similar in magnitude to those for NGr and Gr . This value of I D /I G is slightly larger than that for Ni−Gr (0.85), possibly due to the structural defects generated by heterogeneous nitrogen atoms in the graphene layers …”

Section: Resultsmentioning

confidence: 91%

“…The Ni−NGr electrocatalyst was synthesized according to the process we developed . Graphene oxide was mixed with nickel nitrate and uric acid in the proportion of GO:nickel nitrate:uric acid as 1.0 : 0.5 : 5.0 (mass basis) in DI water and sonicated for 1 hr.…”

Section: Methodsmentioning

confidence: 83%

“…The peak at around 2950 cm −1 in Figure B–a is the combination of D and G bands, often referred to as D+G band. The hump at 3180 cm −1 is due to the overtone of D / (2D / ) band ,. For the Ni‐NGr composite, the intensity ratio of D‐peak to G‐peak (I D /I G ), representing the defect density of carbon is 1.03, which is similar in magnitude to those for NGr and Gr .…”

Section: Resultsmentioning

confidence: 99%

“…The large surface area and pore volume are due to the incorporation of nitrogen into the synthesized composite (Ni−NGr) using uric acid via thermal annealing ,. The BET surface areas of NGr and Gr are given elsewhere; these indicate that the area of Ni−NGr is slightly reduced relative to NGr and enhanced relative to Gr.…”

Section: Resultsmentioning

confidence: 99%

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Nickel‐Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production

et al. 2018

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Nickel nanoparticles supported on nitrogen doped graphene (Ni−NGr) as highly efficient electrocatalyst were synthesized via controlled thermal annealing using a mixture of graphene oxide, nickel nitrate and uric acid. The synthesized Ni−NGr catalyst presented excellent electrocatalytic performance for ethanol, glucose and glycerol oxidation, stemming from the synergistic effects of nickel and N‐graphene. The electrocatalytic activity was enhanced by the high surface area and nitrogen‐based active sites of pyridinic and graphitic N in doped graphene. These N‐moieties enhanced the accessibility of active sites while preventing agglomeration of nickel nanoparticles on the doped graphene surface. The hybrid electrocatalyst performances were significantly improved and are suited for electrooxidation application in fuel cells.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nickel‐Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production

et al. 2018

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3D Heteroatom‐Doped Carbon Nanomaterials as Multifunctional Metal‐Free Catalysts for Integrated Energy Devices

et al. 2019

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Sustainable and cost-effective energy generation has become crucial for fulfilling present energy requirements. For this purpose, development of cheap, scalable, efficient, and reliable catalysts is essential. Carbon based heteroatom doped, three dimensional and mesoporous electrodes are very promising as catalysts for electrochemical energy conversion and storage. Various carbon allotropes doped with variety of heteroatoms can be utilized for cost-effective mass production of electrode materials. 3D porous carbon electrodes provide multiple advantages, such as, large surface area, maximized exposure to active sites, 3D conductive pathways for efficient electron transport, and porous channels to facilitate electrolyte diffusion. However, it is challenging to synthesize and functionalize isotropic 3D carbon WILEY-VCH This article is protected by copyright. All rights reserved. 2 structures. Here, various synthesis processes of 3D porous carbon materials are summarized to understand how their physical and chemical properties together with heteroatom doping dictate the electrochemical catalytic performance. Prospects of attractive 3D carbon structural materials for energy conversion, and efficient integrated energy systems are also discussed.This article is protected by copyright. All rights reserved. 12Recently, 3D carbon electrodes, including MOF-derived mesoporous carbon structures and carbide derived carbon and onion-like carbon structures, [133] have been prepared by solution based chemical processes, condensation and coordination reactions. Other major printing techniques, such as inkjet printing, screen printing, and transfer printing, have also been commonly used for depositing nanostructured carbons onto substrates of varying size, surface energy, and flexibility for energy applications, though 3D printing is an emerging technology. [134][135][136][137][138][139][140][141][142][143][144] 3D printing can offer porous carbon structures of 10 m thick or thicker with very quick drying time (few sec). [133][134][135][136][137] Carbon allotropic nanomaterials combined with various polymers have been used as highly viscous inks for fabricating 3D printed carbon structures for Li-ion batteries, supercapacitors, water splitting electrolyzers, fuel cells, and environmental protection applications. [136][137][138][139][140] Figure 4 illustrates various electrodes fabricated by different 3D printing methods.

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Chipset Nanosensor Based on N‐Doped Carbon Nanobuds for Selective Screening of Epinephrine in Human Samples

Emran

El‐Safty

Elmarakbi

et al. 2021

Adv Materials Inter

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Chipset nanosensor design and fabrication are important for healthcare research and development. Herein, a functionalized chipset nanosensor is designed to monitor neurotransmitters (i.e., epinephrine (EP)) in human fluids. An interdigitated electrode array (IDA) is functionalized by N‐doped carbon nanobud (N‐CNB) and N‐doped carbon nanostructure (N‐CNS). The surface morphology of N‐CNB shows the formation of nanotubular‐like branches on sheets and micrometer‐size tubes. The N‐CNS design consists of the formation of aggregated sheets and particles in nanometer size. The irregular shape formation provides surface heterogeneity and numerous free spaces between the stacked nanostructures. N‐atoms ascertain highly active N‐CNS with multifunctional active centers, electron‐rich charged surface, and short distance pathway. The N‐CNB/IDA exhibits the best performance for EP signaling with high sensitivity and selectivity. The N‐CNB/IDA sensing performance for EP detection indicates the successful design of a highly selective and sensitive assay with low detection limit of 0.011 × 10−6 m and a broad linear range of 0.5 × 10−6 to 3 × 10−6 m. The N‐CNB/IDA exhibits a high degree of accuracy and reproducibility with RSD of 2.7% and 3.9%, respectively. Therefore, the chipset nanosensor of N‐CNB/IDA can be used for on‐site monitoring of EP in human serum samples and further used in daily monitoring of neuronal disorders.

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Pyridinic and graphitic nitrogen-rich graphene for high-performance supercapacitors and metal-free bifunctional electrocatalysts for ORR and OER

Abstract: A facile synthesis of nitrogen-doped graphene with high atomic percentages of pyridinic N and graphitic N is reported. The synthesized materials show superior capacitance performance and metal-free bifunctional electrocatalysis of ORR and OER.

Cited by 131 publications

References 75 publications

Nickel‐Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production

Nickel‐Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production

3D Heteroatom‐Doped Carbon Nanomaterials as Multifunctional Metal‐Free Catalysts for Integrated Energy Devices

Chipset Nanosensor Based on N‐Doped Carbon Nanobuds for Selective Screening of Epinephrine in Human Samples

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