“Inner” and “outer” active surface of RuO2 electrodes

Ardizzone, S.; Fregonara, G.; Trasatti, S.

doi:10.1016/0013-4686(90)85068-x

Cited by 1,614 publications

(963 citation statements)

References 18 publications

Supporting

Mentioning

929

Contrasting

Unclassified

Order By: Relevance

“…1,15,16,18 Consequently, each carbon electrode has to work in a limited electrochemical window of ≈0.5 V, which means that the resulting capacitance (F g −1 ) of the carbon symmetrical device is only one fourth of that of a single carbon electrode when measured in a three-electrode cell. 15 One way to circumvent such limitations is to design an asymmetric (or hybrid) device that combines an activated carbon negative electrode 19 with a battery-type positive electrode, typically PbO 2 15 or Ni(OH) 2 , 16 that is faradaic in nature and operated in a complementary electrochemical window (Fig. 1).…”

Section: Discussionmentioning

confidence: 99%

“…2a), features that are typical of faradaic battery-type electrodes, and certainly distinct in behavior from a true pseudocapacitive electrode. 2 vs MnO 2 .-Conway's definition allows one to differentiate faradaic electrodes from pseudocapacitive ones. In Fig.…”

Section: Discussionmentioning

confidence: 99%

“…If this capacitance is calculated between 0.4 to 0.5 V vs SCE it decreases down to 2000 F g −1 . These calculations clearly show that the "capacitance" for Ni(OH) 2 electrode is definitely not constant over the whole potential window available. Consequently, Ni(OH) 2 electrodes cannot be considered as pseudocapacitive, in contradiction with the authors who state so.…”

Section: Ni(oh)mentioning

confidence: 93%

“…2,3,4,5 This definition can be found in Conway's influential book, "Electrochemical Supercapacitors: Scientific Fundamentals and Technological Applications. 1 Conway stated that: "Regular double layer capacitance arises from the potential-dependence of the surface density of charges stored electrostatically (i.e., non-faradaically) at the interfaces of the capacitor electrodes.…”

Section: Some Definitionsmentioning

confidence: 99%

See 3 more Smart Citations

To Be or Not To Be Pseudocapacitive?

Brousse

Bélanger

Long

2015

J. Electrochem. Soc.

2,228

1,107

View full text Add to dashboard Cite

There are an increasing number of studies regarding active electrode materials that undergo faradaic reactions but are used for electrochemical capacitor applications. Unfortunately, some of these materials are described as "pseudocapacitive" materials despite the fact that their electrochemical signature (e.g., cyclic voltammogram and charge/discharge curve) is analogous to that of a "battery" material, as commonly observed for Ni(OH) 2 and cobalt oxides in KOH electrolyte. Conversely, true pseudocapacitive electrode materials such as MnO 2 display electrochemical behavior typical of that observed for a capacitive carbon electrode. The difference between these two classes of materials will be explained, and we demonstrate why it is inappropriate to describe nickel oxide or hydroxide and cobalt oxide/hydroxide as pseudocapacitive electrode materials.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Ni(oh)mentioning

confidence: 93%

Section: Some Definitionsmentioning

confidence: 99%

See 2 more Smart Citations

To Be or Not To Be Pseudocapacitive?

Brousse

Bélanger

Long

2015

J. Electrochem. Soc.

2,228

1,107

View full text Add to dashboard Cite

show abstract

“…In order to further improve the device performance, we combined ruthenium oxide (RuO 2 ) nanowires with printed SWNT films; the RuO 2 nanowires were synthesized using a chemical vapor deposition (CVD) method. Owing to its unique properties, such as metallic conductivity, intrinsic reversibility of surface redox reactions, and ultrahigh pseudocapacitance, RuO 2 has become one of the most promising electrode materials for electrochemical capacitors [24][25][26]. As we proposed earlier [27], instead of using SWNT films alone, we integrated RuO 2 nanowires together with SWNT films and fabricated hybrid RuO 2 nanowire/ printed SWNT nanostructured films.…”

mentioning

confidence: 99%

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

et al. 2010

View full text Add to dashboard Cite

Single-walled carbon nanotube (SWNT) thin film electrodes have been printed on flexible substrates and cloth fabrics by using SWNT inks and an off-the-shelf inkjet printer, with features of controlled pattern geometry (0.4-6 cm 2 ), location, controllable thickness (20-200 nm), and tunable electrical conductivity. The as-printed SWNT films were then sandwiched together with a piece of printable polymer electrolyte to form flexible and wearable supercapacitors, which displayed good capacitive behavior even after 1,000 charge/discharge cycles. Furthermore, a simple and efficient route to produce ruthenium oxide (RuO 2 ) nanowire/SWNT hybrid films has been developed, and it was found that the knee frequency of the hybrid thin film electrodes can reach 1,500 Hz, which is much higher than the knee frequency of the bare SWNT electrodes (~158 Hz). In addition, with the integration of RuO 2 nanowires, the performance of the printed SWNT supercapacitor was significantly improved in terms of its specific capacitance of 138 F/g, power density of 96 kW/kg, and energy density of 18.8 Wh/kg. The results indicate the potential of printable energy storage devices and their significant promise for application in wearable energy storage devices.

show abstract

Hydrogen evolution reaction

Lasia¹

2010

Handbook of Fuel Cells

View full text Add to dashboard Cite

This chapter presents a review of electrode materials used for the hydrogen evolution reactions and a comparison of their electrocatalytic activities. The introduction presents a brief definition of various thermodynamic water electrolysis potentials. In general, there are two ways to improve the performance of electrode materials: (1) use of electrode materials characterized by higher intrinsic activity i.e., higher exchange current density and (2) use of electrodes characterized by large real surface area. Both methods are used in practice. In this chapter various electrode materials are reviewed: smooth metals, alloys, intermetallic compounds and composites, Raney type materials (Raney Ni, Zn, etc.), oxides, carbides, sulfides, borides, phosphides, amorphous and nano‐crystalline materials etc., Among the most active materials are noble metals, doped Raney‐type alloys, IrO 2 /Ru 2 O, sulfides, borides, and Ni/Mo based alloys. Unfortunately, noble metals are very expensive and easily poisoned and their activity decreases with time. Although many materials may still be improved and optimized there is a need to study the detailed mechanism and kinetics of the HER on these materials and the relation between the geometric (surface roughness) and intrinsic electrocatalytic properties.

show abstract

“Inner” and “outer” active surface of RuO2 electrodes

Cited by 1,614 publications

References 18 publications

To Be or Not To Be Pseudocapacitive?

To Be or Not To Be Pseudocapacitive?

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

Hydrogen evolution reaction

Contact Info

Product

Resources

About