Highly porous nickel oxide thin films prepared by a hydrothermal synthesis method for electrochromic application

Improved Optical and Electrochromic Properties of NiOx Films by Low-Temperature Spin-Coating Method Based on NiOx Nanoparticles

“…Chen et al [ 22 ] and Gamze Atak et al [ 35 ] reported that annealing temperature is also an important parameter affecting the optical and EC properties of NiO-based films. Similarly, we studied the transmittance spectra of NiO x films by spin-coating three times as a function of the annealing temperature for 2 h in air after spin-coating.…”

“…Moreover, the NiO x film annealed at 100 °C and 150 °C exhibits smaller potential separation between the oxidation peaks and the reduction peaks. It is well known that the peak potentials separation are used as a measure of reversibility [ 22 ]. It is reasonable that the NiO x films annealed at 100 °C and 150 °C has better reaction reversibility.…”

“…Complementary EC devices with NiO-based films as counter electrode layers have been extensively studied [ 11 , 12 , 13 ]. Chemical solution methods such as sol-gel methods [ 15 , 16 , 17 , 18 , 19 ], hydrothermal method [ 20 , 21 , 22 ] and chemical bath deposition (CBD) [ 23 , 24 ] have been widely used to fabricate NiO-based films for EC devices. Several ways are generally investigated to improve the optical and EC properties of NiO films.…”

“…Several ways are generally investigated to improve the optical and EC properties of NiO films. The first is to optimize the processing parameters such as thickness [ 12 ], annealing temperature [ 22 ], etc. Second is to improve the electrical properties by doping metal ions such as Al 3+ [ 18 ], B 3+ [ 25 ], Li + [ 26 ], Co + [ 23 ] in NiO films.…”

Understand the Degradation Mechanism of Electrochromic WO3 Films by Double‐step Chronoamperometry and Chronocoulometry Techniques Combined with in situ Spectroelectrochemical Study

“…In the CV test, the separation of the anodic (E a ) and cathodic (E c ) peak potentials, which is 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 expressed as "E c -E a ", was used as a measure of the polarization [43] , and a lower polarization is favorable for reversibility in the film. In the reverse scan, the inserted ions are extracted, resulting in a bleached state.…”