[1] [1] LAMPERT C M. Chromogenic smart materials［J］. Materials Today, 2004, 7(3): 28-35.

[2] [2] GRANQVIST C G. Electrochromic materials: out of a niche［J］. Nature Materials, 2006, 5(2): 89-90.

[3] [3] NIKLASSON G A, GRANQVIST C G. Electrochromics for smart windows: thin films of tungsten oxide and nickel oxide, and devices based on these［J］. Journal of Materials Chemistry, 2007, 17(2): 127-156.

[4] [4] GUSATTI M, SOUZA D A R, RIBEIRO S J L, et al. An electrolyte-free electrochromic device using aluminum as counter electrode material［J］. Solar Energy Materials and Solar Cells, 2023, 260: 112494.

[5] [5] LEE S J, CHOI D S, KANG S H, et al. VO2/WO-3 Based hybrid smart windows with thermochromic and electrochromic properties［J］. ACS Sustainable Chemistry & Engineering, 2019, 7(7): 7111-7117.

[6] [6] GE D T, LEE E, YANG L L, et al. A robust smart window: reversibly switching from high transparency to angle-independent structural color display［J］. Advanced Materials, 2015, 27(15): 2489-2495.

[7] [7] SCROSATI B. Applications of electroactive polymers［M］. Dordrecht: Springer, 1993.

[8] [8] MAHMOUD S A, AKL A A, KAMAL H, et al. Opto-structural, electrical and electrochromic properties of crystalline nickel oxide thin films prepared by spray pyrolysis［J］. Physica B: Condensed Matter, 2002, 311(3/4): 366-375.

[9] [9] GRANQVIST C. Electrochromic oxides: a bandstructure approach［J］. Solar Energy Materials and Solar Cells, 1994, 32(4): 369-382.

[10] [10] MENG L J, ANDRITSCHKY M, DOS SANTOS M P. The effect of substrate temperature on the properties of d.c. reactive magnetron sputtered titanium oxide films［J］. Thin Solid Films, 1993, 223(2): 242-247.

[11] [11] ACUNA J R A, PEREZ I, SOSA V, et al. Sputtering power effects on the electrochromic properties of NiO films［J］. Optik, 2021, 231: 166509.

[13] [13] SONG X W, DONG G B, GAO F Y, et al. Properties of NiOx and its influence upon all-thin-film ITO/NiOx/LiTaO3/WO3/ITO electrochromic devices prepared by magnetron sputtering［J］. Vacuum, 2015, 111: 48-54.

[14] [14] QIU J H, CHEN Z, ZHAO T X, et al. Effect of O2 concentration on the electrochromic properties of NiOx films［J］. Journal of Nanoscience and Nanotechnology, 2018, 18(7): 4814-4821.

[15] [15] TANG Y K, SHEN H X, WANG T Q, et al. Study on electrochemical ion behavior and electrochromic properties of NiO thin films prepared by magnetron sputtering with different oxygen levels［J］. Thin Solid Films, 2023, 769: 139754.

[17] [17] HOU S, GAVRILYUK A I, ZHAO J P, et al. Controllable crystallinity of nickel oxide film with enhanced electrochromic properties［J］. Applied Surface Science, 2018, 451: 104-111.

[18] [18] LU X F, ZHANG S L, SIM W L, et al. Phosphorized CoNi2 S4 yolk-shell spheres for highly efficient hydrogen production via water and urea electrolysis［J］. Angewandte Chemie, 2021, 60(42): 22885-22891.

[19] [19] MOULKI H, FAURE C, MIHELVCIVC M, et al. Electrochromic performances of nonstoichiometric NiO thin films［J］. Thin Solid Films, 2014, 553: 63-66.

[20] [20] TIAN Y, GONG L G, QI X Q, et al. Effect of substrate temperature on the optical and electrical properties of nitrogen-doped NiO thin films［J］. Coatings, 2019, 9(10): 634.

[21] [21] SASI B, GOPCHANDRAN K G. Nanostructured mesoporous nickel oxide thin films［J］. Nanotechnology, 2007, 18(11): 115613.