Effects of complex agents on the anodic deposition and electrochemical characteristics of cobalt oxides

Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

“…The small peak potential difference, ca. 50 mV, indicates a fairly high reversibility of the superficial redox couples (i.e., Co(IV)/Co(III) and Co(III)/Co(II)) in the strong alkaline medium [18]. Moreover, at potentials positive than 0.2 V, a plateau with a potential window of ca.…”

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

“…These new-type ultrahigh power ultracapacitors are so-called next generation supercapacitors [2][3][4] in which the loss in electric energy due to iR drops has to be very carefully considered. Based on this perspective and the promising future applications, several electrochemically active materials with various oxidation states/structures and good reversibility, such as RuO 2 [5][6][7], MnO 2 [8,9], VO x [10,11], CoO x , (Ni-Co)O x [12,13], Fe 3 O 4 [14], and conducting polymers [15,16], have been studied for this purpose.…”

Preparation and electrochemical properties of mesoporous Co3O4 crater-like microspheres as supercapacitor electrode materials

“…The Co 3 O 4 with various microstructures and morphologies involving aerogel [9], film [10] and hollow microspheres [11] has been prepared and assessed for supercapacitor. In the past few years, some researchers have found that the mesoporous structure is useful for electrochemical capacitor because the large specific surface area and optimal pore size (2e5 nm) are beneficial to charge accumulation, redox reaction process [10,12,13] and electrolyte mass transportation [14,15]. Mesoporous silica materials, a significant kind of molecular sieve materials with a uniform pore diameter in the range of 2e50 nm, have been utilized as a template to prepare transition metal oxides with different morphologies and structures, such as Cr 2 O 3 , Mn x O y , Fe 2 O 3 , NiO and In 2 O 3 [16,17].…”