Monolithic flexible supercapacitors drawn with nitrogen-doped carbon nanotube-graphene ink

Zhu, Sheng; Sheng, Jian; Jia, Guodong; Zhang, Zeyao; Guo, Jia; Wang, Meng; Ni, Jiangfeng; Li, Yan

doi:10.1016/j.materresbull.2021.111266

Cited by 20 publications

(4 citation statements)

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“…As shown in Figure 4c, it is found that 0.3 N-CNT@90 V exhibits the smallest diameter in the high-frequency region and the most vertical line in the low-frequency region, indicating the enhanced kinetics process. [40,41] Figure 4d depicts the cyclic voltammetry (CV) curves of individual CNTs and different N-CNT samples at a scan rate of 5 mV s −1 . It can be seen that all samples have a distinctive ORR peak in the voltage range of −0.1 and −0.2 V. At the same time, 0.3 N-CNT@90 V presents the largest integrated area, and the area specific capacitance has been calculated as 101.7 mF cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Flash Nitrogen‐Doped Carbon Nanotubes for Energy Storage and Conversion

Zhang,

Han,

Zhu

2023

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In recent years, nitrogen‐doped carbons show great application potentials in the fields of electrochemical energy storage and conversion. Here, the ultrafast and green preparation of nitrogen‐doped carbon nanotubes (N‐CNTs) via an efficient flash Joule heating method is reported. The precursor of 1D core–shell structure of CNT@polyaniline is first synthesized using an in situ polymerization method and then rapidly conversed into N‐CNTs at ≈1300 K within 1 s. Electrochemical tests reveal the desirable capacitive property and oxygen catalytic activity of the optimized N‐CNT material. It delivers an improved area capacitance of 101.7 mF cm−2 at 5 mV s−1 in 1 m KOH electrolyte, and the assembled symmetrical supercapacitor shows an energy density of 1.03 µWh cm−2 and excellent cycle stability over 10 000 cycles. In addition, the flash N‐CNTs exhibit impressive catalytic performance toward oxygen reduction reaction with a half‐wave potential of 0.8 V in alkaline medium, comparable to the sample prepared by the conventional long‐time pyrolysis method. The Zn–air battery presents superior charge–discharge ability and long‐term durability relative to commercial Pt/C catalyst. These remarkable electrochemical performances validate the superiorities of the Joule heating method in preparing the heteroatom‐doped carbon materials for wide applications.

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Section: Resultsmentioning

confidence: 99%

Flash Nitrogen‐Doped Carbon Nanotubes for Energy Storage and Conversion

Zhang,

Han,

Zhu

2023

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“…Yan Li and their group made a flexible solid supercapacitor by coating gel electrolyte and N-dopped CNT/GO composite to both sides of the paper. A high volumetric capacitance value of 0.45 F/cm 3 was reported and an energy density of 40.0 μWh/cm 3 [ 73 ]. Zheng and coworkers prepared a 2D hierarchical porous carbon nanosheet using polyaniline with acetaldehyde followed by carbonization and activation by KOH and achieved a volumetric capacitance of 3.8 F/cm 3 with a high energy density of 8.4 mWh/cm 3 [ 74 ].…”

Section: Salient Applications Of 2d Materialsmentioning

confidence: 99%

2D materials: increscent quantum flatland with immense potential for applications

et al. 2022

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Quantum flatland i.e., the family of two dimensional (2D) quantum materials has become increscent and has already encompassed elemental atomic sheets (Xenes), 2D transition metal dichalcogenides (TMDCs), 2D metal nitrides/carbides/carbonitrides (MXenes), 2D metal oxides, 2D metal phosphides, 2D metal halides, 2D mixed oxides, etc. and still new members are being explored. Owing to the occurrence of various structural phases of each 2D material and each exhibiting a unique electronic structure; bestows distinct physical and chemical properties. In the early years, world record electronic mobility and fractional quantum Hall effect of graphene attracted attention. Thanks to excellent electronic mobility, and extreme sensitivity of their electronic structures towards the adjacent environment, 2D materials have been employed as various ultrafast precision sensors such as gas/fire/light/strain sensors and in trace-level molecular detectors and disease diagnosis. 2D materials, their doped versions, and their hetero layers and hybrids have been successfully employed in electronic/photonic/optoelectronic/spintronic and straintronic chips. In recent times, quantum behavior such as the existence of a superconducting phase in moiré hetero layers, the feasibility of hyperbolic photonic metamaterials, mechanical metamaterials with negative Poisson ratio, and potential usage in second/third harmonic generation and electromagnetic shields, etc. have raised the expectations further. High surface area, excellent young’s moduli, and anchoring/coupling capability bolster hopes for their usage as nanofillers in polymers, glass, and soft metals. Even though lab-scale demonstrations have been showcased, large-scale applications such as solar cells, LEDs, flat panel displays, hybrid energy storage, catalysis (including water splitting and CO2 reduction), etc. will catch up. While new members of the flatland family will be invented, new methods of large-scale synthesis of defect-free crystals will be explored and novel applications will emerge, it is expected. Achieving a high level of in-plane doping in 2D materials without adding defects is a challenge to work on. Development of understanding of inter-layer coupling and its effects on electron injection/excited state electron transfer at the 2D-2D interfaces will lead to future generation heterolayer devices and sensors.

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“…Various carbon-based nanomaterials, including activated carbon, carbon black, graphene, graphene oxide (GO), reduced graphene oxide (rGO), and CNT , have been preferred as a choice of the electrode material for SC devices due to their outstanding physical and electrochemical characteristics. − Graphene is a 2D structure made of a single layer of sp 2 -hybridized carbon atoms packed into a honeycomb structure with a thickness of 0.335 nm and a carbon–carbon bond of length 0.142 nm (Figure c) . It has a remarkably high specific surface area (2600 m 2 g –1 ) and a theoretical capacitance of nearly 550 F g –1 .…”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Inks for Flexible Supercapacitor Electrodes: A Review

Nargatti,

Pathak,

Ahankari

et al. 2023

ACS Appl. Electron. Mater.

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In the world of consumer electronics, flexible and wearable electronic devices have witnessed a remarkable transformation, and flexible supercapacitors (SCs) hold tremendous potential as a power source for these electronic devices. Printing technologies, such as inkjet and screen printing, have emerged as cost-effective and scalable manufacturing techniques for the fabrication of flexible SC electrodes. As a key element of printing technology, ink must have the right balance of conductivity and rheological properties to fabricate high-performance flexible electrodes. Graphene stands out as a promising active pigment for conductive ink due to its remarkable characteristics such as high surface area, excellent electrical conductivity, and mechanical properties. Recently, extensive research has been conducted on the development of graphene-based inks for their effective utilization in SC printing methods. This review summarizes these advances and systematically connects the graphene ink formulation with its rheological properties and correlates finally with the electrochemical performance of inkjet-and screen-printed SC electrodes.

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Monolithic flexible supercapacitors drawn with nitrogen-doped carbon nanotube-graphene ink

Cited by 20 publications

References 50 publications

Flash Nitrogen‐Doped Carbon Nanotubes for Energy Storage and Conversion

Flash Nitrogen‐Doped Carbon Nanotubes for Energy Storage and Conversion

2D materials: increscent quantum flatland with immense potential for applications

Graphene-Based Inks for Flexible Supercapacitor Electrodes: A Review

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