Umut AYDEMİR, Naeimeh Sadat PEIGHAMBARDOUST

Blue $TiO_2$ nanotube arrays as semimetallic materials with enhanced photoelectrochemical activity towards water splitting

In the past years there has been a great interest in self-doped $TiO_2$nanotubes (blue $TiO_2$ nanotubes) compared to undoped ones owing to their high carrier density and conductivity. In this study, blue $TiO_2$ nanotubes are investigated as photoanode materials for photoelectrochemical water splitting. Blue $TiO_2$ nanotubes were fabricated with enhanced photoresponse behavior through electrochemical cathodic polarization on undoped and annealed $TiO_2$ nanotubes. The annealing temperature of undoped $TiO_2$ nanotubes was tuned before cathodic polarization, revealing that annealing at 500 °C improved the photoresponse of the nanotubes significantly. Further optimization of the blue $TiO_2$ nanotubes was achieved by adjusting the cathodic polarization parameters. Blue $TiO_2$ nanotubes obtained at the potential of –1.4 V (vs. SCE) with a duration of 10 min exhibited twice more photocurrent response (0.39 mA cm–2) compared to the undoped $TiO_2$ nanotube arrays (0.19 mA cm–2). Oxygen vacancies formed through the cathodic polarization decreased charge recombination and enhanced charge transfer rate; therefore, a high photoelectrochemical activity under visible light irradiation could be achieved.

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1. Abe R. Recent progress on photocatalytic and photoelectrochemical water splitting under visible light irradiation. Journal of Photochemistry and Photobiology C Photochemistry Reviews 2010; 11 (4): 179-209. doi: 10.1016/j.jphotochemrev.2011.02.003
2. Alfaifi BY, Ullah H, Alfaifi S, Tahir AA, Mallick TK. Photoelectrochemical solar water splitting: from basic principles to advanced devices. Veruscript Functional Nanomaterials 2018; 2: BDJOC3. doi: 10.22261/fnan.bdjoc3
3. Wang X, Maeda K, Thomas A, Takanabe K, Xin G et al. A metal-free polymeric photocatalyst for hydrogen production from water under visible light. Nature Materials 2009; 8 (1): 76-80. doi: 10.1038/nmat2317
4. Maeda K, Domen K. Photocatalytic water splitting: recent progress and future challenges. The Journal of Physical Chemistry Letters 2010; 1 (18): 2655-2661. doi: 10.1021/jz1007966
5. Tong H, Ouyang S, Bi Y, Umezawa N, Oshikiri M et al. Nano-photocatalytic materials: possibilities and challenges. Advanced Materials 2012; 24 (2): 229-251. doi: 10.1002/adma.201102752
6. Zhang H, Chen G, Bahnemann DW. Photoelectrocatalytic materials for environmental applications. Journal of Materials Chemistry 2009; 19 (29): 5089-5121. doi: 10.1039/b821991e
7. Zhao X, Guo L, Zhang B, Liu H, Qu J. Photoelectrocatalytic oxidation of CuII-EDTA at the $TiO_2$ electrode and simultaneous recovery of CuII by electrodeposition. Environmental Science & Technology 2013; 47 (9): 4480-4488. doi: 10.1021/es3046982
8. Liu M, De Leon Snapp N, Park H. Water photolysis with a cross-linked titanium dioxide nanowire anode. Chemical Science 2011; 2 (1): 80-87. doi: 10.1039/c0sc00321b
9. Hwang YJ, Boukai A, Yang P. High density n-Si/ n-$TiO_2$ core/shell nanowire arrays with enhanced. Nano Letters 2009; 9 (100): 410-415. doi: 10.1021/nl8032763
10. Lin Y, Zhou S, Liu X, Sheehan S, Wang D. $TiO_2 /TiSi_2$ heterostructures for high-efficiency photoelectrochemical $H_2O$ splitting. Journal of the American Chemical Society 2009; 131 (8): 2772-2773. doi: 10.1021/ja808426h
11. Habisreutinger SN, Schmidt-Mende L, Stolarczyk JK. Photocatalytic reduction of CO2 on $TiO_2$ and other semiconductors. Angewandte Chemie International Edition 2013; 52 (29): 7372-7408. doi: 10.1002/anie.201207199
12. Wang YQ, Gu L, Guo YG, Li H, He XQ et al. Rutile-$TiO_2$ nanocoating for a high-rate $Li_4 Ti_5O_{12}$ anode of a lithium-ion battery. Journal of the American Chemical Society 2012; 134 (18): 7874-7879. doi: 10.1021/ja301266w
13. Mor GK, Shankar K, Paulose M, Varghese OK, Grimes CA. Enhanced photocleavage of water using titania nanotube arrays. Nano Letters 2005; 5 (1): 191-195. doi: 10.1021/nl048301k
14. Zhang Z, Hossain MF, Takahashi T. Photoelectrochemical water splitting on highly smooth and ordered $TiO_2$ nanotube arrays for hydrogen generation. International Journal of Hydrogen Energy 2010; 35 (16): 8528-8535. doi: 10.1016/j.ijhydene.2010.03.032
15. Sun Y, Yan K, Wang G, Guo W, Ma T. Effect of annealing temperature on the hydrogen production of $TiO_2$ nanotube arrays in a twocompartment photoelectrochemical cell. The Journal of Physical Chemistry C 2011; 115 (26): 12844-12849. doi: 10.1021/jp1116118
16. Grimes C, Mor GK. $TiO_2$ Nanotube Arrays: Synthesis Properties, and Applications. Berlin, Germany: Springer Verlag, 2009.
17. Ni M, Leung MKH, Leung DYC, Sumathy K. A review and recent developments in photocatalytic water-splitting using $TiO_2$ for hydrogen production. Renewable and Sustainable Energy Reviews 2007; 11 (3): 401-425. doi: 10.1016/j.rser.2005.01.009
18. Li Y, Zhang JZ. Hydrogen generation from photoelectrochemical water splitting based on nanomaterials. Laser & Photonics Reviews 2010; 4 (4): 517-528. doi: 10.1002/lpor.200910025
19. Allam NK, Grimes CA. Room temperature one-step polyol synthesis of anatase $TiO_2$ nanotube arrays: photoelectrochemical properties. Langmuir 2009; 25 (13): 7234-7240. doi: 10.1021/la9012747
20. Zhang Z, Zhang L, Hedhili MN, Zhang H, Wang P. Plasmonic gold nanocrystals coupled with photonic crystal seamlessly on $TiO_2$ nanotube photoelectrodes for efficient visible light photoelectrochemical water splitting. Nano Letters 2013; 13 (1): 14-20. doi: 10.1021/nl3029202
21. Park JH, Park OO, Kim S. Photoelectrochemical water splitting at titanium dioxide nanotubes coated with tungsten trioxide. Applied Physics Letters 2006; 89 (16): 3-6. doi: 10.1063/1.2357878
22. Bakranov N, Zhabaikhanov A, Kudaibergenov S, Ibraev N. Decoration of wide bandgap semiconducting materials for enhancing photoelectrochemical efficiency of PEC systems. Journal of Physics: Conference Series 2018; 987 (1): 012028-012036. doi: 10.1088/1742- 6596/987/1/012028
23. Hoffmann MR, Martin ST, Choi W, Bahnemann DW. Environmental applications of semiconductor photocatalysis. Chemical Reviews 1995; 95 (1): 69-96. doi: 10.1021/cr00033a004
24. Choi W, Termin A, Hoffmann MR. Effects of metal‐ion dopants on the photocatalytic reactivity of quantum‐sized $TiO_2$ particles. Angewandte Chemie International Edition 1994; 33 (10): 1091-1092. doi: 10.1002/anie.199410911
25. Peighambardoust NS, Nasirpouri F. Manipulating morphology, pore geometry and ordering degree of $TiO_2$ nanotube arrays by anodic oxidation. Surface and Coatings Technology 2013; 235: 727-734. doi: 10.1016/j.surfcoat.2013.08.058
26. Peighambardoust NS, Khameneh Asl S, Mohammadpour R, Asl SK. Band-gap narrowing and electrochemical properties in N-doped and reduced anodic $TiO_2$ nanotube arrays. Electrochimica Acta 2018; 270: 245-255. doi: 10.1016/j.electacta.2018.03.091
27. Park JH, Kim S, Bard AJ. Novel carbon-doped $TiO_2$ nanotube arrays with high aspect ratios for efficient solar water splitting. Nano Letters 2006; 6 (1): 24-28. doi: 10.1021/nl051807y
28. Fitzmorris RC, Yang X, Zhang JZ, Wolcott A, Wang G et al. Nitrogen-doped ZnO nanowire arrays for photoelectrochemical water splitting. Nano Letters 2009; 9 (6): 2331-2336. doi: 10.1021/nl900772q
29. Hensel J, Wang G, Li Y, Zhang JZ. Synergistic effect of CdSe quantum dot sensitization and nitrogen doping of $TiO_2$ nanostructures for photoelectrochemical solar hydrogen generation. Nano Letters 2010; 10 (2): 478-483. doi: 10.1021/nl903217w
30. Mor GK, Prakasam HE, Varghese OK, Shankar K, Grimes CA. Vertically oriented Ti-Fe-O nanotube array films: Toward a useful material architecture for solar spectrum water photoelectrolysis. Nano Letters 2007; 7 (8): 2356-2364. doi: 10.1021/nl0710046
31. Samiolo L, Valigi M, Gazzoli D, Amadelli R. Photo-electro catalytic oxidation of aromatic alcohols on visible light-absorbing nitrogendoped $TiO_2$. Electrochimica Acta 2010; 55 (26): 7788-7795. doi: 10.1016/j.electacta.2009.09.044
32. Ohno T, Murakami N, Tsubota T, Nishimura H. Development of metal cation compound-loaded S-doped $TiO_2$ photocatalysts having a rutile phase under visible light. Applied Catalysis A: General 2008; 349 (1-2): 70-75. doi: 10.1016/j.apcata.2008.07.016
33. Neville EM, Ziegler J, Don Macelroy JM, Ravindranathan Thampi K, Sullivan JA. Serendipity following attempts to prepare C-doped rutile $TiO_2$. Applied Catalysis A: General 2014; 470: 434-441. doi: 10.1016/j.apcata.2013.11.024
34. Chen X, Mao SS. Titanium dioxide nanomaterials: synthesis, properties, modifications and applications. Chemical Reviews 2007; 107 (7): 2891-2959. doi: 10.1021/cr0500535
35. Inturi SNR, Boningari T, Suidan M, Smirniotis PG. Visible-light-induced photodegradation of gas phase acetonitrile using aerosol-made transition metal (V, Cr, Fe, Co, Mn, Mo, Ni, Cu, Y, Ce, and Zr) doped $TiO_2$. Applied Catalysis B: Environmental 2014; 144 (2014): 333-342. doi: 10.1016/j.apcatb.2013.07.032
36. Choi W, Termin A, Hoffmann MR. The role of metal ion dopants in quantum-sized $TiO_2$ : Correlation between photoreactivity and charge carrier recombination dynamics. The Journal of Physical Chemistry 1994; 98 (51): 13669-13679. doi: 10.1021/j100102a038
37. Asahi R, Morikawa T, Irie H, Ohwaki T. Nitrogen-doped titanium dioxide as visible-light-sensitive photocatalyst: designs, developments, and prospects. Chemical Reviews 2014; 114 (19): 9824-9852. doi: 10.1021/cr5000738
38. Xing M, Zhang J, Chen F, Tian B. An economic method to prepare vacuum activated photocatalysts with high photo-activities and photosensitivities. Chemical Communications 2011; 47 (17): 4947-4949. doi: 10.1002/anie.201206375
39. Hu YH. A highly efficient photocatalyst-hydrogenated black $TiO_2$ for the photocatalytic splitting of water. Angewandte Chemie International Edition 2012; 51 (50): 12410-12412.
40. Kim C, Kim S, Lee J, Kim J, Yoon J. Capacitive and oxidant generating properties of black-colored $TiO_2$ nanotube array fabricated by electrochemical self-doping. ACS Applied Materials & Interfaces 2015; 7 (14): 7486-7491. doi: 10.1021/acsami.5b00123
41. Zuo F, Wang L, Wu T, Zhang Z, Borchardt D et al. Self-doped $Ti^{3+}$ enhanced photocatalyst for hydrogen production under visible light. Journal of the American Chemical Society 2010; 132 (34): 11856-11857. doi: 10.1021/ja103843d
42. Zhou X, Häublein V, Liu N, Nguyen NT, Zolnhofer EM et al. $TiO_2$ nanotubes: nitrogen-ion implantation at low dose provides noblemetal-free photocatalytic H2 -evolution activity. Angewandte Chemie International Edition 2016; 55 (11): 3763-3767. doi: 10.1002/ anie.201511580
43. Xu Y, Ahmed R, Klein D, Cap S, Freedy K et al. Improving photo-oxidation activity of water by introducing Ti3+ in self-ordered $TiO_2$nanotube arrays treated with Ar/NH3 . Journal of Power Sources 2019; 414 (2018): 242-249. doi: 10.1016/j.jpowsour.2018.12.083
44. Berger T, Lana-Villarreal T, Monllor-Satoca D, Gómez R. Charge transfer reductive doping of nanostructured $TiO_2$ thin films as a way to improve their photoelectrocatalytic performance. Electrochemistry Communications 2006; 8 (11): 1713-1718. doi: 10.1016/j. elecom.2006.08.006
45. Wang G, Wang H, Ling Y, Tang Y, Yang X et al. Hydrogen-treated $TiO_2$ nanowire arrays for photoelectrochemical water splitting gongming. Nano Letters 2011; 11: 3026-3033. doi: 10.1021/nl201766h
46. Chen X, Liu L, Yu PY, Mao SS. Increasing solar absorption for photocatalysis with black hydrogenated titanium dioxide nonocrystals. Science 2011; 331: 746-751. doi: 10.1126/science.1200448
47. Macak JM, Gong BG, Hueppe M, Schmuki P. Filling of $TiO_2$ nanotubes by self-doping and electrodeposition. Advanced Materials 2007; 19 (19): 3027-3031. doi: 10.1002/adma.200602549
48. Chang X, Thind SS, Chen A. Electrocatalytic enhancement of salicylic acid oxidation at electrochemically reduced $TiO_2$ nanotubes. ACS Catalysis 2014; 4 (8): 2616-2622. doi: 10.1021/cs500487a
49. Gillaspie DT, Tenent RC, Dillon AC. Metal-oxide films for electrochromic applications: Present technology and future directions. Journal of Materials Chemistry 2010; 20 (43): 9585-9592. doi: 10.1039/c0jm00604a
50. Sakai N, Fujishima A, Watanabe T, Hashimoto K. Highly hydrophilic surfaces of cathodically polarized amorphous TiO2 electrodes. Journal of the Electrochemical Society 2002; 148 (10): E395-E398. doi: 10.1149/1.1399279
51. Regonini D, Jaroenworaluck A, Stevens R, Bowen CR. Effect of heat treatment on the properties and structure of TiO2 nanotubes: phase composition and chemical composition. Surface and Interface Analysis 2010; 42 (3): 139-144. doi: 10.1002/sia.3183
52. Jiang X, Zhang Y, Jiang J, Rong Y, Wang Y et al. Characterization of oxygen vacancy associates within hydrogenated $TiO_2$: a positron annihilation study. The Journal of Physical Chemistry C 2012; 116 (42): 22619-22624. doi: 10.1021/jp307573c
53. Peighambardoust NS, Asl SK, Mohammadpour R, Asl SK. Improved efficiency in front-side illuminated dye sensitized solar cells based on free-standing one-dimensional $TiO_2$ nanotube array electrodes. Solar Energy 2019; 184: 115-126. doi: 10.1016/j.solener.2019.03.073
54. Zhou H, Zhang Y. Electrochemically self-doped $TiO_2$ nanotube arrays for supercapacitors. Journal of Physical Chemistry C 2014; 118 (11): 5626-5636. doi: 10.1021/jp4082883
55. Liao W, Yang J, Zhou H, Murugananthan M, Zhang Y. Electrochemically self-doped $TiO_2$ nanotube arrays for efficient visible light photoelectrocatalytic degradation of contaminants. Electrochim Acta 2014; 136: 310-317. doi: 10.1016/j.electacta.2014.05.091
56. Tsuchiya H, Macak JM, Ghicov A, Räder AS, Taveira L et al. Characterization of electronic properties of $TiO_2$ nanotube films. Corrosion Science 2007; 49 (1): 203-210. doi: 10.1016/j.corsci.2006.05.009
57. Qin W, Lu S, Wu X, Wang S. Dye-sensitized solar cell based on N-doped $TiO_2$ electrodes prepared on titanium. International Journal of Electrochemical Science 2013; 8 (6): 7984-7990.