Controlling the energetic characteristics of micro energy storage device by in situ deposition Al/MoO3 nanolaminates with varying internal structure

Xu, Jianbing; Shen, Yun; Wang, Chengai; Dai, Ji; Ma, Tai-Yu; Shen, Ruiqi; Wang, Haiyang; Zachariah, Michael R.

doi:10.1016/j.cej.2019.04.205

Cited by 41 publications

(22 citation statements)

References 34 publications

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“…[6][7][8][9][10] Different nanothermite systems were produced by different approaches including ball-milling, vapor deposition technique to produce nanopowders mixtures, 2,[11][12][13][14][15] core-shell structure and nanofoils. [18][19][20][21][22] Among them, fully-dense Al/CuO multilayer materials represent an interesting system for both its potential applications and fundamental science perspectives. The former has spanned various areas including tunable initiation of secondary explosives, 7,23,24 joining, brazing and sealing.…”

Section: Introductionmentioning

confidence: 99%

Integration of Gold Nanoparticles to Modulate the Ignitability of Nanothermite Films

Julien

Cure

Salvagnac

et al. 2020

ACS Appl. Nano Mater.

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Thermite multilayered films composed of alternating thin layers of metal/oxidizers have various uses in microelectromechanical systems (MEMS), microelectronics and materials bonding applications. Recently, applied research especially on the micro-initiator applications has engendered an urgent need to improve ignitability without changing the layering, reactant spacing that both affect the combustion characteristics. This work describes an innovative nanoengineering solution to reduce the energy barriers for mass transport making it possible to substantially lower ignition energy of CuO/Al reactive multilayers without manipulating the fuel and oxide layers thickness. To that end, gold nanoparticles exhibiting high thermal diffusivity properties are in-situ grown uniformly inside the first CuO layer to produce localized hot-spots 2 and promote the Al+CuO reaction. The CuO/Al reactive films with embedded gold nanoparticles exhibit earlier and optimized reaction than standard ones. The effect of gold nanoparticles on the thermite ignition mechanisms and the detailed reaction pathways were characterized by a host of characterization techniques including microscopy, thermal analysis, spectroscopy and X-ray diffractometric. Altogether, results show that the gold nanoparticles are seeding nodular defects with conical shapes provokingunder thermal stimulation-high stressed zones in the multilayer where the Al+CuO reaction is quickly triggered. The analysis of reaction products showed that the multilayers break the unreacted Al droplets early allowing them to burn into the environment. The results provide a behavioral baseline for future studies of interface engineering to tune internal stress-induced reaction in reactive thin films at large.

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Section: Introductionmentioning

confidence: 99%

Integration of Gold Nanoparticles to Modulate the Ignitability of Nanothermite Films

Julien

Cure

Salvagnac

et al. 2020

ACS Appl. Nano Mater.

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“…More and more demands for renewable energy bring about extensive attention to the large‐scale energy storage systems . Among them, all vanadium redox flow battery (VRFB) shows superiority by reason of its long cycling life, deep discharge, high‐energy efficiency, and mutual independence of power and energy ratings .…”

Section: Introductionmentioning

confidence: 99%

“…More and more demands for renewable energy bring about extensive attention to the large-scale energy storage systems. [1][2][3] Among them, all vanadium redox flow battery (VRFB) shows superiority by reason of its long cycling life, deep discharge, high-energy efficiency, and mutual independence of power and energy ratings. [4][5][6] In spite of the aforementioned advantages, the important issues with respect to discharge capacity of the battery, 7,8 output power, and the efficiencies 9 are still existing.…”

Section: Introductionmentioning

confidence: 99%

An optimal electrolyte addition strategy for improving performance of a vanadium redox flow battery

Yang

Deng

et al. 2020

Int J Energy Res

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Summary In this paper, the influences of multistep electrolyte addition strategy on discharge capacity decay of an all vanadium redox flow battery during long cycles were investigated by utilizing a 2‐D, transient mathematical model involving diffusion, convection, and migration mechanisms across the membrane as well as the contact resistance in the battery. Results show that with various multistep electrolyte addition strategies, the discharge capacity decay of the battery can be diminished. An optimal multistep electrolyte addition strategy is presented, which is corresponding to adding 1.04 mol L−1 V3+ electrolyte to a negative tank while adding 1.04 mol L−1 VO2+ electrolyte to a positive tank. Results show that capacity decay of the battery can be debased by 10.8%, which is due to increased vanadium ions in the negative side and the decreased state‐of‐charge (SOC) imbalance between two half‐cells. This study will propose a practical method for mitigating the discharge capacity decay of the battery during operation.

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“…Al-based thermite materials have attracted great attention for decades because of their high energy content and overall stability compared to CHNO energetic mixtures. In addition, ignition and combustion properties, which are easily tuned by modifying the mixture structure and fuel to oxidizer ratio, make these metal-based energetic materials very interesting for many different types of applications: additives in propellants, explosives and pyrotechnics [ 1 , 2 , 3 ], customized heat sources [ 4 , 5 ], microenergetics [ 6 , 7 ], rapid fuses and microinitiators [ 8 , 9 , 10 , 11 , 12 , 13 ], brazing of materials, as well as use as a pressure generator as for molecular delivery (such as biological neutralization) [ 14 , 15 , 16 ]. The potential spreading of nanothermite materials, including reactive thermite nanolaminates [ 9 , 17 , 18 , 19 , 20 , 21 , 22 ], in a variety of applications in both defense and civilian domains, absolutely requires a clear statement of how these nanomaterials do behave with time and storage conditions.…”

Section: Introductionmentioning

confidence: 99%

How Thermal Aging Affects Ignition and Combustion Properties of Reactive Al/CuO Nanolaminates: A Joint Theoretical/Experimental Study

Estève¹,

Lahiner²,

Julien³

et al. 2020

Nanomaterials

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The paper reports a joint experimental/theoretical study on the aging of reactive Al/CuO nanolaminates, investigating both structural modifications and combustion properties of aged systems. We first show theoretically that the long-term storage (over several decades) in ambient temperature marginally affects nanolaminates structural properties with an increase in an interfacial layer of only 0.3 nm after 30 years. Then, we observe that the first thermal aging step occurs after 14 days at 200 °C, which corresponds to the replacement of the natural Al/CuO interfaces by a proper ~11 nm thick amorphous alumina. We show that this aging step does impact the nanolaminates structure, leading, for thin bilayer thicknesses, to a substantial loss of the energetic reservoir: considering a stoichiometric Al/CuO stack, the heat of reaction can be reduced by 6–40% depending on the bilayer thickness ranging from 150 nm (40%) to 1 µm (6%). The impact of such thermal aging (14 days at 200 °C) and interfacial modification on the initiation and combustion properties have been evaluated experimentally and theoretically. Varying Al to CuO ratio of nanolaminates from 1 to 3, we show that ignition time of aged systems does not increase over 10% at initiation power densities superior to 15 W·mm−2. In contrast, burn rate can be greatly impacted depending on the bilayer thickness: annealing a stoichiometric nanolaminates with a bilayer thickness of 300 nm at 200 °C for 14 days lowers its burn rate by ~25%, whereas annealing a fuel rich nanolaminates with the same bilayer thickness under the same thermal conditions leads to a burn rate decrease of 20%. When bilayer thickness is greater than 500 nm, the burn rate is not really affected by the thermal aging. Finally, this paper also proposes a time–temperature diagram to perform accelerated thermal aging.

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Controlling the energetic characteristics of micro energy storage device by in situ deposition Al/MoO3 nanolaminates with varying internal structure

Cited by 41 publications

References 34 publications

Integration of Gold Nanoparticles to Modulate the Ignitability of Nanothermite Films

Integration of Gold Nanoparticles to Modulate the Ignitability of Nanothermite Films

An optimal electrolyte addition strategy for improving performance of a vanadium redox flow battery

How Thermal Aging Affects Ignition and Combustion Properties of Reactive Al/CuO Nanolaminates: A Joint Theoretical/Experimental Study

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