All Metal Nitrides Solid‐State Asymmetric Supercapacitors

Zhu, Changrong; Yang, Peihua; Chao, Dongliang; Wang, Xingli; Zhang, Xiao; Chen, Shi; Tay, Beng Kang; Huang, Hui; Zhang, Hua; Mai, Wenjie; Fan, Hong Jin

doi:10.1002/adma.201501838

Cited by 379 publications

(199 citation statements)

References 57 publications

(61 reference statements)

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“…In order to improve the rate capability of NiCo2O4 electrodes, we introduced titanium nitride (TiN) to form NiCo2O4@TiN core-shell nanostructures with NiCo2O4. TiN attracted our attention due to the following reasons: 1) TiN is already commonly used in industry for electronics and wear resistance applications due to its low cost, scalability, and superior corrosion resistance [46,47]; 2) as a metallic material, TiN offers superb electrical conductivity (4000-55500 S cm -1 ) and mechanical stability [48][49][50]; 3) previous reports have demonstrated that transition metal nitrides are capable of delivering high energy and power density as supercapacitor electrodes [51,52]. Meanwhile, by employing atomic layer deposition (ALD), we were able to conformally grow a TiN shell onto complex nanostructures such as the NiCo2O4 nanofiber arrays without altering the desired structural features of the underlying NiCo2O4 matrix.…”

Section: Introductionmentioning

confidence: 99%

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Wang

Xia

Wei

et al. 2016

Electrochimica Acta

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Graphical abstract Highlights: NiCo2O4 nanostructures are prepared via simple hydrothermal method. Outer shell of TiN is then grown through conformal atomic layer deposition. Electrodes exhibit significantly enhanced rate capability with TiN coating. Solid-state polymer electrolyte is employed to improve cycling stability. Full devices show a stack power density of 58.205 mW cm -3 at 0.061 mWh cm -3 . AbstractTernary transition metal oxides such as NiCo2O4 show great promise as supercapacitor electrode materials. However, the unsatisfactory rate performance of NiCo2O4 may prove to be a major hurdle to its commercial usage. Herein, we report the development of NiCo2O4@TiN core-shell nanostructures for all-solid-state supercapacitors with significantly enhanced rate capability. We demonstrate that a thin layer of TiN conformally grown by atomic layer deposition (ALD) on NiCo2O4 nanofiber arrays plays a key role in improving their electrical conductivity, mechanical stability, and rate performance. Fabricated using the hybrid NiCo2O4@TiN electrodes, the symmetric all-solid-state supercapacitor exhibited an impressive stack power density of 58.205 mW cm -3 at a stack energy density of 0.061 mWh cm -3 . To the best of our knowledge, these values are the highest of any NiCo2O4-based all-solid-state supercapacitor reported. Additionally, the resulting NiCo2O4@TiN all-solid-state device displayed outstanding cycling stability by retaining 70% of its original capacitance after 20,000 cycles at a high current density of 10 mA cm -2 . These results illustrate the promise of ALD-assisted hybrid NiCo2O4@TiN electrodes for sustainable and integrated energy storage applications.

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Section: Introductionmentioning

confidence: 99%

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Wang

Xia

Wei

et al. 2016

Electrochimica Acta

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“…Asymmetric and hybrid supercapacitors (HSCs) have been extensively studied as a promising strategy to increase the energy density20212223242526. A typical HSC consists of both faradaic and capacitive electrodes1227.…”

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confidence: 99%

Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors

et al. 2017

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Carbon materials are generally preferred as anodes in supercapacitors; however, their low capacitance limits the attained energy density of supercapacitor devices with aqueous electrolytes. Here, we report a low-crystalline iron oxide hydroxide nanoparticle anode with comprehensive electrochemical performance at a wide potential window. The iron oxide hydroxide nanoparticles present capacitances of 1,066 and 716 F g−1 at mass loadings of 1.6 and 9.1 mg cm−2, respectively, a rate capability with 74.6% of capacitance retention at 30 A g−1, and cycling stability retaining 91% of capacitance after 10,000 cycles. The performance is attributed to a dominant capacitive charge-storage mechanism. An aqueous hybrid supercapacitor based on the iron oxide hydroxide anode shows stability during float voltage test for 450 h and an energy density of 104 Wh kg−1 at a power density of 1.27 kW kg−1. A packaged device delivers gravimetric and volumetric energy densities of 33.14 Wh kg−1 and 17.24 Wh l−1, respectively.

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“…36 In view of these studies and other recent work using TiN as the shell in core-shell supercapacitor structures, [37][38][39] there is a signicant need to understand how the formation of surface oxide affects the electrochemical behaviour of TiN surfaces. Herein we have applied various oxidation treatments to low area titanium nitride surfaces and linked their charge storage capacity to a detailed characterisation of the electrode surfaces.…”

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confidence: 99%

Effect of oxidative surface treatments on charge storage at titanium nitride surfaces for supercapacitor applications

et al. 2017

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All Metal Nitrides Solid‐State Asymmetric Supercapacitors

Cited by 379 publications

References 57 publications

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors

Effect of oxidative surface treatments on charge storage at titanium nitride surfaces for supercapacitor applications

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