A fast and efficient approach to fabricate tarnish-resistant nanocrystalline Ag-Ge thin films by direct current electrodeposition

Bahmani, Elnaz; Zakeri, Alireza; Rouhaghdam, A. Sabour

doi:10.1016/j.matlet.2020.127991

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Among the surface engineering techniques, electrodeposition is a common and well-known method owing to its flexibility, moderate costs, and simple procedure [44][45][46][47]. Fig.…”

Section: As-electrodeposited Samplesmentioning

confidence: 99%

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Zakeri

Balashadehi

Rouhaghdam

2021

jcc

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Ni/Co-modified aluminide coatings were prepared on the Hastelloy-X superalloy by a combined process of electrodeposition and slurry aluminizing. In this regard, pure layers of Ni and Ni-50wt.%Co were initially applied via electrodeposition process and successive aluminization was carried out by a slurry technique. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the microstructural and chemical composition characterization of the specimens. The results of these analyses revealed that a compact and dense aluminide coating was formed with a two-layered structure containing the outer Al-rich β phase and inner interdiffusion zone. Moreover, the presence of pre-electrodeposited layers inhibited the outward diffusion flux of elements from the substrate and effectively suppressed the formation of Kirkendall pores. The hot corrosion studies of the obtained coatings indicated that the addition of a pre-electrodeposited layer could enhance the high-temperature corrosion performance of the coatings when exposed to sulfate salt.

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“…Among the surface engineering techniques, electrodeposition is a common and well-known method owing to its flexibility, moderate costs, and simple procedure [44][45][46][47]. Fig.…”

Section: As-electrodeposited Samplesmentioning

confidence: 99%

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Zakeri

Balashadehi

Rouhaghdam

2021

jcc

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“…All the Nyquist plots contain an intercept line in the low-frequency region that shows a Li-ion diffusion through the bulk of the cathode material and two semicircles: the first one in the high-frequency region related to the interfacial film resistance ( R sf ) and the second one in the medium-frequency regions representing the charge-transfer resistance at the electrode–electrolyte interface ( R ct ). − The EIS spectra are fitted using ZView software and the corresponding data are summarized in Table S2. Furthermore, the Li-ion diffusion coefficient ( D Li ) of the electrodes was calculated based on eq − and is given in Table S2. where A c denotes the cathode surface area, C Li signifies the lithium-ion concentration in the cathode, F is the Faraday constant, n stands for the number of electrons per molecule during the redox process, R is the gas constant, T is the absolute temperature, and σ is the Warburg coefficient according to eq , …”

Section: Resultsmentioning

confidence: 99%

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Khollari

Azar

Esmaeili

et al. 2021

ACS Appl. Energy Mater.

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Nowadays, the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode material has attracted great research interest due to its high energy density and less usage of costly raw materials. However, the high nickel content of NCM811 brings about an extremely unstable interface between the electrode and electrolyte and therefore inferior cyclic stability. Herein, we have proposed a straightforward method to deliver 1, 2, and 4 wt % of TiO 2 nanoparticles (NPs) on the surface of the NCM811 cathode material and to improve its properties at room and high temperatures. Based on scanning electron microscopy and transmission electron microscopy observations, the coating thickness varies from 10 to 35 nm and the 2 wt % TiO 2 -coated cathode is provided with uniformly distributed NPs that could result in an improved structural stability and electrochemical performance. In detail, at 25 and 55 °C and 1 C, the 2 wt % TiO 2 -coated cathode shows capacity retentions of 90.0 and 80.5% after 100 cycles, higher than those of pristine and coated cathodes. Under a high current rate of 10 C at 25 and 55 °C, the discharge capacities of the 2 wt % TiO 2 -coated cathode were 135.9 and 141.4 mA h g −1 , which are significantly higher than those of the pristine cathode material (128.3 and 89.1 mA h g −1 ). Results of the dissolution test at 55 °C reflect the effectiveness of the TiO 2 coating in maintaining the structural integrity of the cathode material and protecting it from HF attack and deleterious side reactions. Also, the differential scanning calorimetry result proves the enhanced safety after surface modification; the TiO 2 coating shifts the exothermic peak of the electrode from 231.1 to 242.9 °C. Therefore, surface modification with TiO 2 NPs can be proposed as a practical and cost-effective method for the commercial application of the high energy density NCM811 cathode at room and high temperatures. KEYWORDS: LiNi 0.8 Co 0.1 Mn 0.1 O 2 , nanocoating, TiO 2 , safety, cathode, lithium-ion batteries

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“…Numerous studies have concentrated on incorporating Ag alloy additives to prevent oxidation and tarnishing. 21,22 Ag-based coatings hold great promise as a solution to increase antitarnish properties. 23 Therefore, exploring a high improvement in the antitarnish property of incorporating an Ag-based composite is quite a substantial goal.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The tarnishing process is a naturally occurring phenomenon connected to the interaction between silver- and sulfur-containing compounds found within the surrounding environment. Numerous studies have concentrated on incorporating Ag alloy additives to prevent oxidation and tarnishing. , Ag-based coatings hold great promise as a solution to increase antitarnish properties . Therefore, exploring a high improvement in the antitarnish property of incorporating an Ag-based composite is quite a substantial goal.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Ag–C Composites Containing a Hexagonal Diamond Structure to Inhibit Tarnishing of Sterling Silver

Hongrutai,

Nganglumpoon,

Watmanee

et al. 2023

ACS Appl. Nano Mater.

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Three-dimensional nanocrystalline Ag–C composites containing a hexagonal diamond structure were produced by electrochemical reduction of acetic acid and electrodeposition of Ag(NO3) (0.01 M) at −1.1 V vs Ag/AgCl at ambient conditions. After applying the negative potential, an ultrathin layer of Ag (<0.1 μm) was first deposited, and subsequently, competitive electrodeposition of Ag and electroreduction of acetic acid resulted in the formation of nanocrystalline Ag–C products on the electrodes. A combination of microscopic, structural, and spectroscopic characterization results reveals that the nanocrystalline Ag–C contains a hexagonal diamond structure with an average crystallite size of 26 nm. The nanodiamond phase remained unchanged throughout 15–140 min reaction time. However, increasing the reaction time, the thickness of nanocrystalline Ag–C films increased to ∼2 μm with some large polyhedra carbon structures. The nanocrystalline Ag–C composites were utilized in the casting process of sterling silver to enhance its antitarnish properties. The antitarnishing of sterling silver upon exposure to a H2S environment was significantly improved by 50% with 0.005 wt % loading of the Ag–C composite.

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A fast and efficient approach to fabricate tarnish-resistant nanocrystalline Ag-Ge thin films by direct current electrodeposition

Cited by 7 publications

References 9 publications

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Nanocrystalline Ag–C Composites Containing a Hexagonal Diamond Structure to Inhibit Tarnishing of Sterling Silver

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A fast and efficient approach to fabricate tarnish-resistant nanocrystalline Ag-Ge thin films by direct current electrodeposition

Cited by 7 publications

References 9 publications

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Electrochemical Performance and Elevated Temperature Properties of the TiO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 Cathode Material for High-Safety Li-Ion Batteries

Nanocrystalline Ag–C Composites Containing a Hexagonal Diamond Structure to Inhibit Tarnishing of Sterling Silver

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Product

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About

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries