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In this work, WO3 crystal structure films are deposited on conductive glass substrates by seed layer assisted hydrothermal reaction method. Through controlling the concentration of hydrochloric acid, oxalic acid, and the hydrothermal postprocessing temperature, the micro-peony, micro urchin-like, and porous petal-like WO3 crystal structures are obtained respectively. Scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical characterization are used to study the formation mechanism of different structures and their effects on the electrochromic properties of WO3 films. The Cl– in HCl has a strong promoting role towards the c axis in WO3 crystal growth and oxalic acid has a promoting effect towards an a axis. In terms of color efficiency, the CE value of micro-urchin is 42.37 cm2/C, far greater than those of two other WO3 structures, 15.21 cm2/C and 12.71 cm2/C. Owing to the cold-water quenching treatment, the CE value of WO3 micro-peony with porous surface structure is 56.95 cm2/C, quadruple CE value of the smooth surface structure, slightly better than that of the micro-urchin structure.
[1] Sarwar S, Park S, Dao T T, Hong S, Han C-H 2021 Sol. Energy Mat. Sol. C 224 110990
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图 1 不同HCl浓度下生长的WO3晶体拓扑结构的SEM照片 (a) 0 mL; (b) 0.25 mL; (c) 0.50 mL; (d) 0.75 mL
Figure 1. SEM images of WO3 crystal topology structures with different concentration of HCl: (a) 0 mL; (b) 0.25 mL; (c) 0.50 mL; (d) 0.75 mL.
图 2 不同草酸浓度下生长的WO3晶体拓扑结构的SEM照片 (a) 0 mol/L; (b) 0.05 mol/L; (c) 0.10 mol/L; (d) 0.15 mol/L
Figure 2. SEM images of WO3 crystal topology structures with different concentration of oxalic acid: (a) 0 mol/L; (b) 0.05 mol/L; (c) 0.10 mol/L; (d) 0.15 mol/L.
图 3 淬冷处理, 多孔WO3微米花晶体结构在不同放大倍数时的SEM照片
Figure 3. SEM images of WO3 micro-peony crystal structures with the porous structure in different magnification.
图 4 常温处理, 光滑WO3微米花晶体结构在不同放大倍数时的SEM照片
Figure 4. SEM images of WO3 micro-peony crystal structures with the smooth structure in different magnification.
图 5 不同的微米花晶体拓扑表面结构生长示意图
Figure 5. Schematic illustration of the micro-peony crystal network topology growth mechanism.
图 6 WO3大、小微米花晶体结构的XRD图谱
Figure 6. XRD patterns of WO3 blooming peony and small peony
图 7 WO3微米花晶体拓扑结构的TEM照片
Figure 7. TEM images of WO3 micro-peony topology structure.
图 8 WO3花朵片状晶体拓扑结构的SEM照片
Figure 8. SEM images of WO3 crystal network flower petals assembly process.
图 9 WO3微米花瓣晶须的生长原理示意图
Figure 9. Schematic diagram of WO3 micro-peony crystal topology structure.
图 10 花朵状WO3晶体拓扑结构的SEM照片和结构示意图
Figure 10. SEM image of WO3 flower-like topology structure and its simple image.
图 11 高放大倍率下的花朵片状WO3晶体拓扑结构的SEM照片
Figure 11. SEM images of WO3 micro-peony topology structure with high magnification.
图 12 不同WO3晶体拓扑结构的循环伏安曲线
Figure 12. CV curves of different WO3 network topologies.
图 13 WO3样品的多电位阶跃曲线和原位光学反射率曲线
Figure 13. Multi-potential and reflectancecurves of WO3 sample
图 14 3种典型的WO3晶体拓扑结构的原位光学密度和电荷密度的变化曲线
Figure 14. Variation curves of the in situ optical density (∆OD) vs. charge density for the typical mesoscopic WO3 crystalline patterns.
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[1] Sarwar S, Park S, Dao T T, Hong S, Han C-H 2021 Sol. Energy Mat. Sol. C 224 110990
Google Scholar
[2] He J, Zhao H, Wu H, Yang Y, Wang Z, He Z, Jiang G 2021 Phys. Chem. Chem. Phys.
Google Scholar
[3] 汪鑫, 胡文杰, 徐耀 2021 光子学报 50 0731001
Wang X, Hu W J, Xu Y 2021 Acta Photon. Sin. 50 0731001
[4] Zhang L, Zhu T, Xia F, Cui Y, Xia H, Yang G, Gao Y 2021 Ceram. Int. 47 25854
Google Scholar
[5] 史继超, 吴广明, 陈世文, 沈军, 周斌, 倪星元 2007 高等学校化学学报 28 1356
Google Scholar
Shi J C, Wu G M, Chen S W, Shen J, Zhou B, Ni X Y 2007 Chem. J. Chin. Uni. 28 1356
Google Scholar
[6] Yao M, Li T, Long Y, Shen P, Wang G, Li C, Liu J, Guo W, Wang Y, Shen L, Zhan X 2020 Sci. Bull. 65 217
Google Scholar
[7] 刘畅, 孙依, 王晶, 唐莹, 马雪娇, 赵春山 2020 化学与黏合 42 181
Liu C, Sun Y, Wang J, Tang Y, Ma X J, Zhao C S 2020 Chem. Adhesion 42 181
[8] Karaca G Y, Eren E, Cogal G C, Uygun E, Oksuz L, Uygun Oksuz A 2019 Opt. Mater. 88 472
Google Scholar
[9] Yao Y, Zhao Q, Wei W, Chen Z, Zhu Y, Zhang P, Zhang Z, Gao Y 2020 Nano Energy 68 104350
Google Scholar
[10] Uchiyama H, Nakamura Y, Igarashi S 2021 RSC Adv. 11 7442
Google Scholar
[11] Li Y, Zhao J, Chen X, Wang L, Li W, Zhang X 2021 J. Inorg. Mater. 36 451
Google Scholar
[12] Gu H, Guo C, Zhang S, Bi L, Li T, Sun T, Liu S 2018 ACS Nano 12 559
Google Scholar
[13] Fang H, Zheng P, Ma R, Xu C, Yang G, Wang Q, Wang H 2018 Mater. Horiz. 5 1000
Google Scholar
[14] Zheng R, Wang Y, Pan J, Malik H A, Zhang H, Jia C, Weng X, Xie J, Deng L 2020 ACS Appl. Mater. Inter. 12 27526
Google Scholar
[15] 方成, 汪洪, 施思奇 2016 物理学报 65 168201
Google Scholar
Fang C, Wang H, Shi S Q 2016 Acta Phys. Sin. 65 168201
Google Scholar
[16] Wang J L, Lu Y R, Li H H, Liu J W, Yu S H 2017 J. Am. Chem. Soc. 139 9921
Google Scholar
[17] 贾汉祥, 曹逊, 金平实 2020 无机材料学报 35 511
Google Scholar
Jia H X, Cao X, Jin P S 2020 J. Inorg. Mater. 35 511
Google Scholar
[18] Li J L, Liu X Y 2013 Soft Fibrillar Materials: Fabrication and Applications (Weinheim: Wiley-VCH Verlag GmbH & Co. KGaA) pp163−182
[19] Albert R, Barabasi A L 2002 Rev. Mod. Phys. 74 47
Google Scholar
[20] Lin N, Liu X Y 2015 Chem. Soc. Rev. 44 7881
Google Scholar
[21] Yang B, Barnes P R F, Zhang Y, Luca V 2007 Catal. Lett. 118 280
Google Scholar
[22] Miyauchi M, Shibuya M, Zhao Z G, Liu Z 2009 J. Phys. Chem. C 113 10642
Google Scholar
[23] Zheng H, Ou J Z, Strano M S, Kaner R B, Mitchell A, Kalantar-zadeh K 2011 Adv. Funct. Mater. 21 2175
Google Scholar
[24] Shibuya M, Miyauchi M 2009 Chem. Phys. Lett. 473 126
Google Scholar
[25] Wang J, Khoo E, Lee P S, Ma J 2009 J. Phys. Chem. C 113 9655
Google Scholar
[26] Adhikari S, Sarkar D 2014 RSC Adv. 4 20145
Google Scholar
[27] Wu Y, Hu M, Tian Y 2017 Chin. Phys. B 26 020701
Google Scholar
[28] Ma D, Wang H, Zhang Q, Li Y 2012 J. Mater. Chem. 22 16633
Google Scholar
[29] Gu Z, Ma Y, Yang W, Zhang G, Yao J 2005 Chem. Commun. (Camb) 3597
[30] Liu Z, Miyauchi M, Yamazaki T, Shen Y 2009 Sensor. Actuat. B:Chem. 140 514
Google Scholar
[31] Ko R M, Wang S J, Tsai W C, Liou B W, Lin Y R 2009 CrystEngComm 11 1529
Google Scholar
[32] Su J, Feng X, Sloppy J D, Guo L, Grimes C A 2011 Nano Lett. 11 203
[33] Song Y, Zhang Z, Yan L, Zhang L, Liu S, Xie S, Xu L, Du J 2019 Nanomaterials (Basel) 9 1795
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