N/S co-doped three-dimensional graphene hydrogel for high performance supercapacitor

Zhang, Weijie; Chen, Zhongtao; Guo, Xinli; Jin, Kai; Wang, Yixuan; Li, Long; Zhang, Yao; Wang, Zengmei; Sun, Litao; Zhang, Tong

doi:10.1016/j.electacta.2018.05.018

Cited by 148 publications

(63 citation statements)

References 49 publications

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“…In recent years, they have gained great attention because of their high specific surface area, good electron mobility, porous, and 3D-networked structure [27][28][29]. Graphene hydrogel (GH) is a 3D graphene material that can be prepared easily by hydrothermal reduction [30][31][32] and chemical reduction [33,34]. To date, GH has been used in supercapacitors [30,34,35] and electrochemical sensors [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

“…Graphene hydrogel (GH) is a 3D graphene material that can be prepared easily by hydrothermal reduction [30][31][32] and chemical reduction [33,34]. To date, GH has been used in supercapacitors [30,34,35] and electrochemical sensors [36][37][38][39]. GH-based nanocomposites show excellent electrocatalytic activity to the oxidation of ascorbic acid (AA), dopamine (DA), and uric acid (UA), which has been used in their simultaneous detection in human serum samples [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Cao

Zhu

et al. 2019

Sensors

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A selective and sensitive electrochemical sensor was developed for simultaneous detection of phytohormones indole-3-acetic acid (IAA) and salicylic acid (SA). The sensing interface was fabricated on a porous, three-dimensional networked graphene hydrogel (GH) modified glassy carbon electrode (GCE). The electrocatalytic behavior of IAA and SA on the surface of the modified electrode (GH/GCE) was investigated by cyclic voltammetry and linear sweep voltammetry. Results show that the oxidation reactions of IAA and SA occur at different potentials, which enable their simultaneous detection at the sensing interface. Under optimal conditions, the GH/GCE exhibited good selectivity and stability and its response, unaffected by various interferents, was linear in the range of 4 to 200 µM of IAA and SA. The limit of detection (S/N = 3) achieved were 1.42 µM for IAA and 2.80 µM for SA. The sensor performance was validated by measuring for IAA and SA in real vegetable samples with satisfactory results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Cao

Zhu

et al. 2019

Sensors

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“…The relative intensity of the D to G peaks ( I D / I G ) can be used to estimate the graphitic degree of carbon. For the N‐OSC, this value (0.90) is a little larger than that of OSC (0.85), also indicating that calcined under NH 3 atmosphere can enhance the voids and defect in carbon . The lattice defects of graphite in carbon materials lead to the increase in the density of states in Fermi plane and also improve the conductivity of materials .…”

Section: Resultsmentioning

confidence: 90%

Natural Okra Shells Derived Nitrogen‐Doped Porous Carbon to Regulate Polysulfides for High‐Performance Lithium–Sulfur Batteries

Liu

Shi

et al. 2019

Energy Tech

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Low conductivity of elemental sulfur, the “shuttle effect” of polysulfides, and structural change hamper lithium–sulfur batteries that have poor electrochemical performance. Herein, a facile and scalable approach to fabricate porous carbon is derived from common okra wastes, okra shells, as a matrix for sulfur active materials. Especially, the material calcined under NH3 (N‐doped biomass‐derived porous carbon [N‐OSC]) with a high specific surface area of 2702 m2 g−1 and large pore volume (0.17 cm3 g−1) provides necessary physical adsorption, resulting in the 69.71 wt% loading of sulfur and excellent trapping capacity for polysulfides during the redox process. Furthermore, N element can act as catalytic active sites to facilitate redox conversion from polysulfides to Li2S. Benefiting from the aforementioned advantages, the cell of the N‐OSC/S electrode manifests superior electrochemical performance. The initial capacity is found up to be 1387 mA h g−1 at a current density of 0.1 C and 750 mA h g−1 after 200 cycles at 0.5 C rate (where 1 C = 1672 mA h g−1). For durability evaluations, the capacity is maintained at 416 mA h g−1 at 2 C after 1000 cycles with a mere decay of 0.05% per cycle.

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“…Bao et al . denoted that pyrrolic N is the only form of nitrogen dopant that has significant influence on the hydrochlorination reaction, but co‐existence of pyrrolic N and pyridinic N on the edge or defect of carbon surface is very common in nitrogen doped carbon materials, What's worse, pyrrolic N species are unstable under high temperature, they could be transformed into more stable pyridinic N species if high‐temperature treatment was used ,. To the best of our knowledge, no solution has ever been reported for this problem.…”

Section: Introductionmentioning

confidence: 99%

Carbon with Surface‐Enriched Nitrogen and Sulfur Supported Au Catalysts for Acetylene Hydrochlorination

et al. 2019

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What prompted you to investigate this topic?Carbon-supported gold catalysts have the potential to replace the toxic mercuric chloride-baseds ystem that already applied industrially in acetylene hydrochlorination. However, the existence of complex nitrogen species on carbon surfacee ssentially hinderst he assessment of the nature of the active site. In this respect, an efficient method, to adjustt he nitrogen speciation, is necessary for the sustainable expansion of the technology.W eh erein introduce an innovative strategyt hat tunes the nitrogen speciation, establishes an interaction between nitrogen functionalitiesa nd sulfur sites and shed light on the interplay mechanism.What was the inspiration for this cover design?

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N/S co-doped three-dimensional graphene hydrogel for high performance supercapacitor

Cited by 148 publications

References 49 publications

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Natural Okra Shells Derived Nitrogen‐Doped Porous Carbon to Regulate Polysulfides for High‐Performance Lithium–Sulfur Batteries

Carbon with Surface‐Enriched Nitrogen and Sulfur Supported Au Catalysts for Acetylene Hydrochlorination

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