Annealing effect on the performance of RuO2–Ta2O5/Ti electrodes for use in supercapacitors

Chen, Ho-Rei; Lai, Huen-Hua; Jow, Jiin-Jiang

doi:10.1016/j.matchemphys.2010.10.003

Cited by 22 publications

(3 citation statements)

References 23 publications

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“…Hydrous ruthenium‐based electrochemical capacitors are known for excellent C sp , but high material cost limits their widespread use in industry. To reduce the cost, mixing oxides (such as Ta 2 O 5 , 26 Cr 2 O 3 , 126 and TiO 2 71 ; Figure 6C,D) with oxide of ruthenium (IV) show effectiveness. The thermal decomposition method was verified to help synthesize mixed oxide of ruthenium (IV) based electrode material.…”

Section: Synthesis Methods and Classification Of Different Types Of R...mentioning

confidence: 99%

Performance enhancement of ruthenium‐based supercapacitors: A review

et al. 2022

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Having an interesting requirement for reliable energy storage, the search for materials capable of providing perfect electrochemical performances is going on at a great rate. Scientists are making momentous attempts toward developing renewable energy and green energy. Batteries, fuel cells, and supercapacitors (SCs) are the most efficient and suitable tools for electrochemical alteration and energy storage. Current research and development of attention mainly on how to improve the performance of the SC by developing new hybrid capacitors. Blend or hybrid SC conveys high capacitance in contrast with the current electric double‐layer capacitor (EDLC) and pseudo‐capacitors building material of superconductors. The utilization of ruthenium in supercapacitors either as a direct electroactive material or as a conducting agent has been widely analyzed in the last few decades due to the rapid reversible redox process and a variety of valence options, and flexible environmental adaptability. In this review, we studied various aspects of ruthenium (Ru)‐based superconductors, their types, metal/non‐metal/polymer doping, as well as oxides and reduced oxides of ruthenium incorporated. We summarize the morphologies and structures of various studies of Ru‐composites followed by the researchers' suggested characterization methods and find out the promising electrochemical performance.

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Section: Synthesis Methods and Classification Of Different Types Of R...mentioning

confidence: 99%

Performance enhancement of ruthenium‐based supercapacitors: A review

et al. 2022

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“…[8][9][10] Heat treatment below the crystallization temperature of ATO is known to improve its electrical properties. [11][12][13][14][15] However, some of the details of the oxide transformation and structural change of ATO during heat treating below its crystallization temperature remain unclear. 14,[16][17][18][19][20] Temperature and atmosphere are the main parameters controlling the oxide transformation.…”

mentioning

confidence: 99%

“…[11][12][13][14][15] However, some of the details of the oxide transformation and structural change of ATO during heat treating below its crystallization temperature remain unclear. 14,[16][17][18][19][20] Temperature and atmosphere are the main parameters controlling the oxide transformation. Specifically, it is known that heating the as-grown, amorphous ATO to high temperatures around will result in the formation of crystallization oxide.…”

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confidence: 99%

In-Situ Stress Measurement during Heat Treatment of Amorphous Tantalum Oxide

Viste

Hossick-Schott

et al. 2015

ECS J. Solid State Sci. Technol.

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Heat treatment is known to improve the electrical and mechanical properties of amorphous tantalum oxide (ATO) in tantalum capacitor anodes. In-situ, multi-beam optical stress sensor (MOSS) measurements were performed on the ATO / tantalum system during heat-treatment in air and vacuum. Thermal desorption mass spectroscopy was also used to monitor species desorbing from the oxide during heating in vacuum. In addition, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the heat-treated samples. The results suggest that the ATO/Ta system undergoes changes as a function of annealing temperature and atmosphere. At temperatures below ∼400 • C, the main effects are oxide dehydration and densification, indicated by a net compressive stress. After heat-treatment at temperatures above 400 • C in air, the net stress becomes increasingly compressive with increasing temperature. Oxide growth due to oxygen uptake is the likely cause for the compressive stress. In vacuum, the net stress remains tensile even after heat-treating at high temperatures above 400 • C. Dehydration and the formation of a high density of oxygen vacancies at the metal-oxide interface during heat-treatment are the likely causes for the net tensile stress-thickness. Tantalum capacitors are widely used in various electrical systems.1-3 Amorphous tantalum oxide (ATO) serves as the dielectric. The use of tantalum capacitors in high reliability applications generated intensive research on the electrical properties of the ATO, specifically on phenomena related to dielectric breakdown in high electric fields.3-7 Oxide defects such as interstitial oxygen ions and oxygen vacancies can significantly influence electrical and mechanical properties of ATO. [8][9][10] Heat treatment below the crystallization temperature of ATO is known to improve its electrical properties. 11-15However, some of the details of the oxide transformation and structural change of ATO during heat treating below its crystallization temperature remain unclear.14, [16][17][18][19][20] Temperature and atmosphere are the main parameters controlling the oxide transformation. Specifically, it is known that heating the as-grown, amorphous ATO to high temperatures around will result in the formation of crystallization oxide. 13,21,22 Phase transformations and reactions in solids are typically accompanied by volume changes that can induce stresses when the material is subjected to a mechanical constraint. In Ta capacitors, this occurs because the ATO dielectric is constrained by the underlying Ta metal. In-situ stress measurements have been previously employed to explore the details of phase transformations and reactions in thin solid films. 3,18,[23][24][25] In our recent work, this approach has been used to study the amorphous-to-crystalline phase transition in ATO under high electrical fields.3,26 For example, compressive stress of 0.06 GPa was generated in the ATO along with morphological changes that lead to cracking in the dielectric. 26 In the present stud...

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Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

Majumdar¹,

Maiyalagan

Jiang³

2019

ChemElectroChem

255

147

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Electrochemical energy storage has emerged as one of the principal topics of present‐day research to deal with the high energy demands of modern society. Accordingly, besides fuel cells and battery technologies, interesting and challenging results have been observed in the recent past, during the materialization of “supercapacitors” or “ultracapacitors”, which have provoked a sharp increase in research inclination to revisit this aspect of renewable and sustainable energy storage. Supercapacitor performances are largely dependent on electrode materials, the nature of the electrolyte used, and the range of voltage windows employed. Carbon‐based electrode materials have tunable properties such as electrical conductivity, extensive surface area, and faster electron transfer kinetics with low fabrication costs. But their specific capacitances are found to be too low for commercialization. Ruthenium dioxide (RuO2), owing to its high theoretical specific capacitance value (1400–2000 F g−1), has been extensively recognized as a favorable material for supercapacitor devices, but high production cost and agglomeration effects stand as high barriers preventing marketable usage. Consequently, RuO2‐based nanocomposites have been widely studied to optimize the material cost, with simultaneous improvement in the electrochemical performances. This Review describes comprehensively the recent progress in terms of the fabrication and design, electrochemical performance, and achievements of RuO2 and its nanocomposites as electrode materials for supercapacitors, which will be beneficial for further research designing high‐performance supercapacitor devices.

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Annealing effect on the performance of RuO2–Ta2O5/Ti electrodes for use in supercapacitors

Cited by 22 publications

References 23 publications

Performance enhancement of ruthenium‐based supercapacitors: A review

Performance enhancement of ruthenium‐based supercapacitors: A review

In-Situ Stress Measurement during Heat Treatment of Amorphous Tantalum Oxide

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

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