Gallium Nitride Crystals: Novel Supercapacitor Electrode Materials

Wang, Shouzhi; Zhang, Lei; Shao, Yongliang; Wu, Yongzhong; Lv, Jiaxin

doi:10.1002/adma.201600725

Cited by 141 publications

(124 citation statements)

References 72 publications

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“…The areal capacitance of the electrode was 21.22 mF cm −2 (current density 0.1 mA cm −2 ) (Fig. 5c), which is higher than that of GaNAG (3.92 mF cm −2 at 0.5 mA cm −2 )7. Figure 5c shows that the areal capacitance held at 15.78 mF cm −2 , which is advanced than some electrode materials, such as CoNiS 2 (9 mF cm −2 )27, nitride TiO 2 (1.4 mF cm −2 at 1 mA cm −2 )34, SiN (0.11 mF cm −2 )35 and carbon nanotube (CNT)@MnO 2 (2.43 mF cm −2 at 0.5 mA cm −2 )36.…”

Section: Resultsmentioning

confidence: 86%

“…During the decomposition reactions, many vacancies or defects were generated on the surface of pores, which have been proven by PL. These defects and vacancies increased the absorption of electrolyte ion on the surface of the electrode, and further enhanced the capacitance performance under the high rates conditions7.…”

Section: Resultsmentioning

confidence: 99%

“…With these properties, GaN has potential for a wide range of applications in manufacturing next-generation optoelectronics and high-power and high-frequency devices3. Single crystal GaN membranes have recently attracted much attention because of its unique electronic, optoelectronic, and mechanical properties4567. GaN membrane-based light-emitting diodes4, normally off enhancement-type GaN membrane metal oxide semiconductor transistors5, and GaN membrane-based flexible optoelectronic devices6 have been fabricated.…”

mentioning

confidence: 99%

“…GaN membrane-based light-emitting diodes4, normally off enhancement-type GaN membrane metal oxide semiconductor transistors5, and GaN membrane-based flexible optoelectronic devices6 have been fabricated. These devices exhibit excellent performance, especially in terms of energy storage; n-type single-crystal GaN porous membrane was used as electrode of the supercapacitor, which exhibits excellent cycling lifespan and ultrahigh power density7. GaN crystal membranes offer many superior features that cannot be reproduced in other material forms; they are of central importance to a rapidly expanding frontier8.…”

mentioning

confidence: 99%

“…Despite these developments however, established methods contain multiple steps and sometimes require utilization of expensive equipment, which greatly hinder the further development of GaN crystal membranes in practical application. Our previous work fabricated single-crystal GaN membranes using two-step electrochemical etching7. However, the two-step electrochemical etching technique is complex and easily introduce contaminations.…”

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confidence: 99%

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One-step fabrication of porous GaN crystal membrane and its application in energy storage

Zhang

Wang

Shao

et al. 2017

Sci Rep

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Single-crystal gallium nitride (GaN) membranes have great potential for a variety of applications. However, fabrication of single-crystalline GaN membranes remains a challenge owing to its chemical inertness and mechanical hardness. This study prepares large-area, free-standing, and single-crystalline porous GaN membranes using a one-step high-temperature annealing technique for the first time. A promising separation model is proposed through a comprehensive study that combines thermodynamic theories analysis and experiments. Porous GaN crystal membrane is processed into supercapacitors, which exhibit stable cycling life, high-rate capability, and ultrahigh power density, to complete proof-of-concept demonstration of new energy storage application. Our results contribute to the study of GaN crystal membranes into a new stage related to the elelctrochemical energy storage application.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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One-step fabrication of porous GaN crystal membrane and its application in energy storage

Zhang

Wang

Shao

et al. 2017

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Epidermal Supercapacitor with High Performance

Luan

Zhang

Zhou

et al. 2016

Adv Funct Materials

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wileyonlinelibrary.comRecent development in epidermal and bionic electronics systems has promoted the increasing demand for supercapcacitors with micrometer-thickness and good compatibility. Here, a highly flexible free-standing epidermal supercapacitor (SC-E) with merely 1 μm thickness and high performance is developed. Single-walled carbon nanotube/poly(3,4-ethylenedioxythiophene) hybrid films with unique inner-connected reticulation are adopted as electrodes for ultrathin structure and high electric conductivity. Then, based on two substrates with different surface energies, a stepwise lift-off method is presented to peel off the ultrathin integrated supercapacitor from the substrates nondestructively. As a result of the high conductive hybrid electrodes and the thin electrolyte layer, the as-designed supercapacitors (based on the total mass of two electrodes) achieve a good capacitance of 56 F g −1 and a superhigh power density of 332 kW kg −1 , which manifest superior performance in contrast to the other devices fabricated by traditional electrodes. Meanwhile, the ultrashort response time of 11.5 ms enables the epidermal supercapacitor (SC-E) work for high-power units. More importantly, the free-standing structure and outstanding flexibility (10 5 times bending) endow the SC-E with excellent compatibility to be integrated and work in the next generation of smart and epidermal systems.

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Oxygen Vacancy Modulation of Bimetallic Oxynitride Anodes toward Advanced Li‐Ion Capacitors

Wang

et al. 2020

Adv Funct Materials

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Binary metal oxides (such as NiCo2O4) are regarded as attractive electrode materials for advanced energy storage devices since they offer more electrochemical activity and higher capacity than monometal oxide. However, the volume expansion and low electronic conductivity are the main bottleneck seriously hindering their application. To overcome these barriers, a novel strategy that introduces a bimetallic oxynitride layer (NiCoON) with oxygen vacancy to the surface of NiCo2O4 nanowires as an anode for Li‐ion capacitors (LICs) is proposed. The oxygen vacancy on the surface and the modulation of multiple valence states are investigated by the electron paramagnetic resonance, X‐ray photoelectron spectroscopy characterization, and first‐principles calculation. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of active sites, the optimized NiCoON electrode delivers remarkable capacity (1855 mAh g−1 at 0.2 A g−1) and rate performance. The LIC device assembled by NiCoON anodes and N‐doped carbon nanowire cathodes delivers excellent rate capability, high energy density (148.5 Wh kg−1), and outstanding power density (30 kW kg−1). This study provides a new pathway for developing bimetallic oxides with an improved performance in electrochemical energy storage, conversion fields, and beyond.

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Gallium Nitride Crystals: Novel Supercapacitor Electrode Materials

Cited by 141 publications

References 72 publications

One-step fabrication of porous GaN crystal membrane and its application in energy storage

One-step fabrication of porous GaN crystal membrane and its application in energy storage

Epidermal Supercapacitor with High Performance

Oxygen Vacancy Modulation of Bimetallic Oxynitride Anodes toward Advanced Li‐Ion Capacitors

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