Improvement of thermoelectric properties of WO3 ceramics by ZnO addition

Improved pseudocapacitive performance of well-defined WO3−x nanoplates

“…SEM images, particle size distributions, TEM images, and HR-TEM images (inset: FFT pattern) of as-WO 3 ((a)-(d)), 400-WO 3 À x ((e)-(h)), 500-WO 3 À x ((i)-(l)), and c-WO 3 À x ((m)-(p)). 28.81 corresponding to (112) evidently appeared in the monoclinic WO 3 . However, as shown in Fig.…”

“…Many works on supercapacitors utilizing pseudo-capacitance have focused on amorphous hydrous tungsten oxide [21]. Tungsten oxides (WO 3 ) are widely studied in both crystalline and amorphous forms as an electrode material for sensors and electrochromic devices, because WO 3 is an attractive electrode material with multiple oxidation states [22][23][24][25][26][27][28][29]. More importantly, to improve the pseudocapacitive performance of WO 3 electrodes, high electrical conductivity for low total internal resistance and high surface area nanostructure are needed [29].…”

Transition metal oxides – Thermoelectric properties

“…Recently, the TE properties of ZnO doped WO3 ceramics were investigated [161]. The introduction of ZnO was shown to result in an increased σ, by approximately two orders of magnitude, while causing only a slight drop in S. A ZnO doping concentration of 0.5 % was found to be optimal, resulting in a maximum TPF of 1.34 μW/m.K 2 at 973 K, which is similar to the values reported in stoichiometric WO3 and at least four orders of magnitude higher than that of non-stoichiometric WO3 [171].…”

“…(a) Seebeck coefficient, (b) electrical conductivity variation with temperature for α-WO3 films and (c) TPF obtained for varying ZnO doping concentrations in WO3 ceramics. (Reproduced with permission from (a), (b)[168] and (c)[161]. )…”

Block‐Copolymer‐Assisted One‐Pot Synthesis of Ordered Mesoporous WO3−x/Carbon Nanocomposites as High‐Rate‐Performance Electrodes for Pseudocapacitors

“…More importantly, the high intrinsic density (>7 g cm −3 ) implies that WO 3 can be an alternative electrode material for small size ECs system due to the high volumetric power/energy performance. To make high performance WO 3 electrodes, achievement of both increasing electrical conductivity of WO 3 (≈0.01 S cm −1 at 973 K)7 for low total internal resistance and developing high surface nanostructured WO 3 through a facile synthetic method is highly required. However, until now there are a few reports on the pseudocapacitive performance of tungsten oxide materials 6b–e…”