Electrochemical properties of ruthenised electrodes in the oxide layer region

Horvat-Radošević, Višnja; Kvastek, Krešimir; Vukovìć, Marijan; Čukman, Dunja

doi:10.1016/s0022-0728(00)00048-6

Cited by 26 publications

(19 citation statements)

References 36 publications

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“…Besides, the small peak at 284.88 eV can be attributed to C-1s peak from graphite-like carbon atoms [42]. The above results indicate the existence of ruthenium dioxide (RuO 2 and RuO 2 .xH 2 O) and some amount of Ru(0) on the surface of the freshly prepared composites, in agreement with previous studies [17, [43][44][45]. The presence of these hydrous ruthenium oxides is expected to improve the electrochemical reversibility and conductivity of the flexible composites.…”

supporting

confidence: 91%

“…The voltammetric response observed in Fig. 6 for the electrode prepared by the potentiostatic method is similar to that reported for a thin film of ruthenium oxide [35,[43][44][45]. On the positive scan direction it can be observed the hydrogen region in which the ionization of adsorbed hydrogen atoms overlaps with the adsorption of water on ruthenium atoms [43,44] [35,43].…”

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confidence: 83%

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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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supporting

confidence: 91%

supporting

confidence: 83%

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

Sieben

Morallón

Cazorla‐Amorós

2013

Energy

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“…Various methods, such as solution chemistry techniques [1,7], electrochemical deposition [1,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], sputtering techniques [6,7], and organometallic chemical vapor deposition [22] have been employed to prepare ruthenium oxide films. The electrodeposition methods offer a number of advantages compared with other techniques.…”

Section: Introductionmentioning

confidence: 99%

Anodic, cathodic and cyclic voltammetric deposition of ruthenium oxides from aqueous RuCl3 solutions

Jow

Lee

Chen

et al. 2007

Electrochimica Acta

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“…This technique is used in working conditions of the electrochemical sources in order to determine their technical parameters, including degree of charging [1][2][3][4][5][6] or operation conditions such as state of health, state of charge, or depth of discharge [7][8][9], or for optimizing the operating conditions of the fuel cells [10][11][12][13][14][15]. In this case, impedance measurements are usually carried out in a two-electrode configuration.…”

Section: Introductionmentioning

confidence: 99%

A complete impedance analysis of electrochemical cells used as energy sources

Ślepski

Darowicki

Janicka

et al. 2012

J Solid State Electrochem

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A comprehensive description of impedance of electrochemical systems has been presented, along with the assumptions of the method used. In this method, a multisinusoidal current excitation signal is used. The changes of potential of both the electrodes and the potential difference between these electrodes are all registered simultaneously as a function of time. The proposed method offers the possibility of separately determining the instantaneous value of impedance of each electrode as well as the impedance of a twoelectrode system. The short-time Fourier transform of time registers allow the determination of changes in the measured impedance values over time. The method has been successfully verified with an electrical equivalent circuit simulating a non-stationary two-electrode system. The values of the impedance of particular components during operation of the fuel cell under a changing load have been obtained.

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Electrochemical properties of ruthenised electrodes in the oxide layer region

Cited by 26 publications

References 36 publications

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

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

Anodic, cathodic and cyclic voltammetric deposition of ruthenium oxides from aqueous RuCl3 solutions

A complete impedance analysis of electrochemical cells used as energy sources

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