Nitrogen-doped hierarchically porous carbon foam: A free-standing electrode and mechanical support for high-performance supercapacitors

Chen, Jizhang; Xu, Junling; Zhou, Shuang; Zhao, Ni; Wong, Ching‐Ping

doi:10.1016/j.nanoen.2016.04.037

Cited by 291 publications

(121 citation statements)

References 68 publications

Supporting

Mentioning

117

Contrasting

Order By: Relevance

“…[42][43][44] The formation of the tungsten oxide characteristic peak can be ascribed to unavoidable oxidation in the air atmosphere.T he high-resolution N1ss pectrum (Figure 2c)o ft he samples can be mainly fitted by three peaks centered at 398.6, 400.1, and 401.6 eV,w hich are assignable to pyridinic N, pyrrolic N, and graphitic Ni nt he pyrolyzed products. [51,52] The XPS spectra are consistentw ith the results of XRD, not only revealing the successful doping of Ni nto the carbon framework but also indicating the rich WC and Co-N-Ca ctive speciesi n the catalyst. [30,46,47] Pyridinic Nc an serve as metal coordination sites owing to the lone-pair electrons, forming metal-N/ Cc onfigurations.…”

Section: Resultssupporting

confidence: 72%

Functional Species Encapsulated in Nitrogen‐Doped Porous Carbon as a Highly Efficient Catalyst for the Oxygen Reduction Reaction

Song

Wang

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

The scarcity, high cost, and poor stability of precious metal-based electrocatalysts have stimulated the development of novel non-precious metal catalysts for the oxygen reduction reaction (ORR) for use in fuel cells and metal-air batteries. Here, we fabricated in situ a hybrid material (Co-W-C/N) with functional species (tungsten carbide and cobalt nanoparticles) encapsulated in an N-doped porous carbon framework, through a facile multi-constituent co-assembly method combined with subsequent annealing treatment. The unique structure favors the anchoring active nanoparticles and facilitates mass transfer steps. The homogenously distributed carbide nanoparticles and adjacent Co-N-C sites lead to the electrocatalytic synergism for the ORR. The existence of Co and W can promote the graphitization of the carbon matrix. Benefiting from its structural and material superiority, the Co-W-C/N electrocatalyst exhibits excellent electrocatalytic activity (with a half-wave potential of 0.774 V vs. reversible hydrogen electrode (RHE)), high stability (96.3 % of the initial current remaining after 9000 s of continuous operation), and good immunity against methanol in alkaline media.

show abstract

Section: Resultssupporting

confidence: 72%

Functional Species Encapsulated in Nitrogen‐Doped Porous Carbon as a Highly Efficient Catalyst for the Oxygen Reduction Reaction

Song

Wang

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…Before fabricating the hybrid device, the Fe 3 O 4 @C anode was pre-activated for five cycles at 0.1 Ag À1 in an Li half-cell andt hen lithiated at 1.0 V vs. Li/Li + to achieveh igh efficiency.F igure 4a illustrates the configuration and charge storage mechanism of the LIC based on an a-PANF cathode and an Fe 3 O 4 @C anode.D uring the chargep rocess of the LIC, PF 6 À anions are absorbed into the [30] 3: 2D Kapok fiber-derived carbon nanosheet//2D MnO/C, [33] 4: tubular mesoporous carbon//SnO 2 -C, [34] [35] 11:B NC//BNC, [10b] 12:P J-AC//natural graphite, [36] 13:P AC//Sn-C. [10a] (f) Capacity retention of a-PANF//Fe 3 O 4 @C LIC with an a-PANF:Fe 3 O 4 @C weight ratio of 2.2:1. Before fabricating the hybrid device, the Fe 3 O 4 @C anode was pre-activated for five cycles at 0.1 Ag À1 in an Li half-cell andt hen lithiated at 1.0 V vs. Li/Li + to achieveh igh efficiency.F igure 4a illustrates the configuration and charge storage mechanism of the LIC based on an a-PANF cathode and an Fe 3 O 4 @C anode.D uring the chargep rocess of the LIC, PF 6 À anions are absorbed into the [30] 3: 2D Kapok fiber-derived carbon nanosheet//2D MnO/C, [33] 4: tubular mesoporous carbon//SnO 2 -C, [34] [35] 11:B NC//BNC, [10b] 12:P J-AC//natural graphite, [36] 13:P AC//Sn-C. [10a] (f) Capacity retention of a-PANF//Fe 3 O 4 @C LIC with an a-PANF:Fe 3 O 4 @C weight ratio of 2.2:1.…”

Section: Hybrid Device Performancementioning

confidence: 99%

Electrospun N‐Doped Hierarchical Porous Carbon Nanofiber with Improved Degree of Graphitization for High‐Performance Lithium Ion Capacitor

Shi

Han

et al. 2018

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

The lithium-ion capacitor (LIC) has been regarded as a promising device that combines the merits of lithium-ion batteries and supercapacitors, and that meets the requirements for both high energy and high power density. The development of advanced electrode materials is the key requirement. Herein, we report the bottom-up synthesis of activated carbon nanofiber (a-PANF) with a hierarchical porous structure and a high degree of graphitization. Electrospinning has been employed to prepare an interconnected fiber network with macropores, and ferric acetylacetonate has been introduced as both a mesopore-creating agent and a graphitic catalyst to increase the degree of graphitization. Furthermore, chemical activation enlarges the specific surface area by producing abundant micropores. Half-cell evaluation of the as-prepared a-PANF gave a discharge capacity of 80 mA h g at 0.1 A g within 2-4.5 V and no capacity fading after 1000 cycles at 2 A g , which represents a significant improvement compared to conventional activated carbon (AC). Furthermore, an as-assembled LIC with a-PANF cathode and Fe O anode showed a superior energy density of 124.6 W h kg at a specific power of 93.8 W kg , which remained at 103.7 W h kg at 4687.5 W kg . This indicates promising application potential of a-PANF as an electrode material for efficient energy storage systems.

show abstract

“…[40] On the other hand, the Faradaic energy storage of layered materials is driven by the Adv. [41,42] The diffusion-controlled intercalation storage mechanism corresponds to the typical battery-type charge-storage behavior of bulk layered materials with phase transitions. 2018, 8,1702930 Figure 2.…”

Section: Charge Storage Mechanisms and Features Of Layered Materialsmentioning

confidence: 99%

Emergent Pseudocapacitance of 2D Nanomaterials

Yun

Yeon

et al. 2018

Advanced Energy Materials

248

190

View full text Add to dashboard Cite

naming of energy storage devices after their own core materials: conventional batteries such as lead-acid batteries, which are named after the lead-based active material and the acidic electrolyte; nickelcadmium batteries named after the nickeland cadmium-based active materials; nickel-metal hybrid batteries named after the nickel-and metal hydride-based active materials; state-of-the-art lithium-ion batteries (LIBs), named after the lithiated host materials and lithium-ion carriers; and next-generation batteries such as sodiumion, lithium-sulfur, and lithium-air batteries, which are named after the lithium metal anode and sulfur or O 2 cathode. [4][5][6][7][8][9] In short, whenever energy storage materials made a breakthrough, new-generation energy storage devices appeared. Among electrochemical energy storage devices, supercapacitors (SCs), which can store charges at the surface, have advantages over LIB and conventional batteries in terms of high power, fast charging/ discharging rates, and long cyclability, as will be discussed in Section 2.1. However, the low energy density of SCs remains a critical challenge for emerging applications such as next-generation electronic systems, electrical vehicles (EVs), and renewable energy storage systems (ESSs). [10,11] Based on the long history of energy storage research, new and emerging materials are expected to provide solutions to this problem.Returning to the chronological development of SCs, SCs have been revolutionized by the emergence of new materials, as Two dimensional (2D) nanomaterials are very attractive due to their unique structural and surface features for energy storage applications. Motivated by the recent pioneering works demonstrating "the emergent pseudocapacitance of 2D nanomaterials," the energy storage and nanoscience communities could revisit bulk layered materials though state-of-the-art nanotechnology such as nanostructuring, nanoarchitecturing, and compositional control. However, no review has focused on the fundamentals, recent progress, and outlook on this new mechanism of 2D nanomaterials yet. In this study, the key aspects of emergent pseudocapacitors based on 2D nanomaterials are comprehensively reviewed, which covers the history, classification, thermodynamic and kinetic aspects, electrochemical characteristics, and design guidelines of materials for extrinsically surface redox and intercalation pseudocapacitors. The structural and compositional controls of graphene and other carbon nanosheets, transition metal oxides and hydroxides, transition metal dichalcogenides, and metal carbide/nitride on both microscopic and macroscopic levels will be particularly addressed, emphasizing the important results published since 2010. Finally, perspectives on the current impediments and future directions of this field are offered. Unlimited combinations and modifications of 2D nanomaterials can provide a rational strategy to overcome intrinsic limitations of existing materials, offering a new-generation energy storage materials toward a high and new p...

show abstract

Nitrogen-doped hierarchically porous carbon foam: A free-standing electrode and mechanical support for high-performance supercapacitors

Cited by 291 publications

References 68 publications

Functional Species Encapsulated in Nitrogen‐Doped Porous Carbon as a Highly Efficient Catalyst for the Oxygen Reduction Reaction

Functional Species Encapsulated in Nitrogen‐Doped Porous Carbon as a Highly Efficient Catalyst for the Oxygen Reduction Reaction

Electrospun N‐Doped Hierarchical Porous Carbon Nanofiber with Improved Degree of Graphitization for High‐Performance Lithium Ion Capacitor

Emergent Pseudocapacitance of 2D Nanomaterials

Contact Info

Product

Resources

About