Mesoporous RuO2 for the next generation supercapacitors with an ultrahigh power density

Lin, Keh-moh; Chang, Kuo‐Hsin; Hu, Chi‐Chang; Li, Yuan-Yao

doi:10.1016/j.electacta.2009.03.058

Cited by 102 publications

(52 citation statements)

References 48 publications

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“…The performance metrics are extremely high when compared to other oxide pseudocapacitors. [ 88,89 ] To further explore the nature of these charge storage processes, the electrochemical insertion/deinsertion kinetics of mp-MoS 2 were investigated using the Trasatti analysis [90][91][92] to quantify the diffusion-controlled and capacitive charge storage processes υ αν ( )…”

Section: Electrochemistrymentioning

confidence: 99%

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Cook

Kim

Yan

et al. 2016

Advanced Energy Materials

427

274

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The ion insertion properties of MoS2 continue to be of widespread interest for energy storage. While much of the current work on MoS2 has been focused on the high capacity four‐electron reduction reaction, this process is prone to poor reversibility. Traditional ion intercalation reactions are highlighted and it is demonstrated that ordered mesoporous thin films of MoS2 can be utilized as a pseudocapacitive energy storage material with a specific capacity of 173 mAh g−1 for Li‐ions and 118 mAh g−1 for Na‐ions at 1 mV s−1. Utilizing synchrotron grazing incidence X‐ray diffraction techniques, fast electrochemical kinetics are correlated with the ordered porous structure and with an iso‐oriented crystal structure. When Li‐ions are utilized, the material can be charged and discharged in 20 seconds while still achieving a specific capacity of 140 mAh g−1. Moreover, the nanoscale architecture of mesoporous MoS2 retains this level of lithium capacity for 10 000 cycles. A detailed electrochemical kinetic analysis indicates that energy storage for both ions in MoS2 is due to a pseudocapacitive mechanism.

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Section: Electrochemistrymentioning

confidence: 99%

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Cook

Kim

Yan

et al. 2016

Advanced Energy Materials

427

274

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“…[54]. Figure 8 shows the Ragone plots for some electrode materials over the entire scan rate range investigated in this work.…”

mentioning

confidence: 99%

Flexible ruthenium oxide-activated carbon cloth composites prepared by simple electrodeposition methods

Sieben

Morallón

Cazorla‐Amorós

2013

Energy

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This work focuses on the preparation of flexible ruthenium oxide containing activated carbon cloth by electrodeposition. Different electrodeposition methods have been used, including chronoamperometry, chronopotentiometry and cyclic voltammetry. The electrochemical properties of the obtained materials have been measured. The results show that the potentiostatic method allows preparing composites with higher specific capacitance than the pristine activated carbon cloth. The capacitance values measured by cyclic voltammetry at 10 mV s -1 and 1 V of potential window were up to 160 and 180 F g -1 . This means an improvement of 82 % and 100 % with respect to the capacitance of the pristine activated carbon cloth. This excellent capacitance enhancement is attributed to the small particle size (4-5 nm) and the three-dimensional nanoporous network of the ruthenium oxide film which allows reaching very high degree of oxide utilization without blocking the pore structure of the activated carbon cloth. In addition, the electrodes maintain the mechanical properties of the carbon cloth and can be useful for flexible devices.Corresponding Author *E. Morallon, morallon@ua.es, Telf. +34-965909590 2 IntroductionThe rapid population growth, economic expansion and industries development has increased the global energy consumption. Today, fossil fuels (oil, gas and coal) supply around 85 % of the energy market, providing more than 80 % of the carbon dioxide anthropogenic emissions released into the atmosphere each year. As a result, the present energy system could not be able to sustain the global economic growth in a relative short period of time [1]. In this scenario, the government´s efforts are focused on the development of sustainable solutions that include the replacement of fossil fuels by renewable energy sources, efficiency improvements in the energy production and energy savings on the demand side in order to reduce the carbon emission and to mitigate the global warming consequences (i.e., global climate change and level sea rise) [2].However, many of the renewable energy sources are of a fluctuating nature and cannot cover the daily electricity consumption of industries, households/services and transport activities [3]. To solve this limitation, an efficient storage device can be employed in order to cover the power consumption during the low/zero period of energy production or during a peak power demand [4,5].One of the most important challenges facing scientists today is the construction of efficient systems that can store the energy produced by renewable sources and make it available according to the demand. In this respect, supercapacitors have attracted great attention because they can be used for large commercial applications ranging from small electronic devices as cell phones and emergency medical equipment to electric vehicles and photovoltaic cells [6]. For instance, supercapacitors can be used to recuperate the breaking energy in electric buses [7] and electric/fuel cell cars [8] or to storage the exc...

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“…The major difference with other methods that have employed templates is that the present procedure does not involve any heat treatment to remove the template. Such treatment would results in pore collapse, particle ripening, and loss of intra-particle water, in turn leading to smaller surface area and specific capacitance [43] [44]. The specific capacitance is unfortunately smaller than reported values for RuO 2 •nH 2 O prepared by sol-gel synthesis [25,26], most likely due to the larger primary particle size of RuO x (2 to 3 nm in diameter) constituting the walls and possible incomplete oxidation.…”

Section: Resultsmentioning

confidence: 41%

“…Surfactant assisted synthesis of ordered mesoporous RuO 2 have so far lead to material with substantially low capacitance values, i.e. 100 F g -1 [43], [44], which is likely due to particle ripening and pore collapse due to post heat treatment. Two studies have succeeded in the synthesis of high capacitance mesoporous RuO2, albeit with poorly or no ordered structures [45], [46].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area

Sugimoto

Makino

Mukai

et al. 2012

Journal of Power Sources

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In ordered to prepare high capacitance pseudo-capacitive oxides, it is important to design nanostructures with appreciable mesopores. Supramolecular templating has become a popular method to synthesize ordered mesoporous metals; however, the application of the same technique to synthesis of high surface area oxides is more demanding. We present here, the synthesis of ordered mesoporous ruthenium metal by lyotropic liquid crystal templating and its electrochemical conversion to ordered mesoporous ruthenium oxide by a simple, room temperature procedure. The bulk, unsupported metallic ordered mesoporous ruthenium exhibits high surface area of 110 m 2 g -1 , which is comparable to typical supported Ru nanoparticles. The oxide analogue gives a high specific capacitance of 376 F g -1 , owing to the porous structure. These results demonstrate a possible facile and generic process to synthesize oxides with ordered nanostructures by utilization of the various phases that can be obtained with lyotropic liquid crystalline templates such as cubic, hexagonal, lamellar, etc. comparable to state-of-the-art, supported ruthenium nanoparticles.► Ordered mesoporous ruthenium was electrochemically converted to its oxide analogue, with high specific capacitance.

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Mesoporous RuO2 for the next generation supercapacitors with an ultrahigh power density

Cited by 102 publications

References 48 publications

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Flexible ruthenium oxide-activated carbon cloth composites prepared by simple electrodeposition methods

Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area

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Mesoporous RuO2 for the next generation supercapacitors with an ultrahigh power density

Cited by 102 publications

References 48 publications

Mesoporous MoS2 as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Mesoporous MoS2 as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Flexible ruthenium oxide-activated carbon cloth composites prepared by simple electrodeposition methods

Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area

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Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage