WO3 decorated photoelectrodes of titanium nanotube arrays (W-oxide TNTAs) were synthesized via a two-step process, namely, electrochemical oxidation of titanium foil and electrodeposition of W-oxide for various interval times of 1, 2, 3, 5, and 20 min to improve the photoelectrochemical performance and the amount of hydrogen generated. The synthesized photoelectrodes were characterized by various characterization techniques. The presence of tungsten in the modified TNTAs was confirmed using energy dispersive X-ray spectroscopy (EDX). Field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscope (HRTEM) proved the deposition of W-oxide as small particles staked up on the surface of the tubes at lower deposition time whereas longer times produced large and aggregate particles to mostly cover the surface of TiO2 nanotubes. Additionally, the incorporation of WO3 resulted in a shift of the absorption edge toward visible light as confirmed by UV-Vis diffuse reflectance spectroscopy and a decrease in the estimated band gap energy values hence, modified TNTAs facilitated a more efficient utilization of solar light for water splitting. From the photoelectrochemical measurement data, the optimal photoelectrode produced after 2 min of deposition time improved the photo conversion efficiency and the hydrogen generation by 30% compared to that of the pure TNTA.
ALI Heba, ISMAIL N., AMIN M. S., MEKEWI Mohamed. WO3颗粒改性垂直排列TiO2纳米管阵列用于氢燃料生产[J]. Frontiers in Energy, 2018, 12(2): 249-258.
Heba ALI, N. ISMAIL, M. S. AMIN, Mohamed MEKEWI. Decoration of vertically aligned TiO2 nanotube arrays with WO3 particles for hydrogen fuel production. Front. Energy, 2018, 12(2): 249-258.
Hunge Y M, Mahadik M A, Moholkar A V, Bhosale C H. Photoelectrocatalytic degradation of oxalic acid using WO3 and stratified WO3/TiO2 photocatalysts under sunlight illumination. Ultrasonics Sonochemistry, 2017, 35(Pt A): 233–242 https://doi.org/10.1016/j.ultsonch.2016.09.024
pmid: 27720594
2
Van de Krol R, Grätzel M. Photoelectrochemical Hydrogen Production. New York: Springer, 2012
3
Wydrzynski T J, Hillier W. Molecular Solar Fuels. Cambridge: Royal Society of Chemistry, 2012
4
Archer M D, Nozik A J. Nanostructured and Photoelectrochemical Systems for Solar Photon Conversion. London: Imperial College Press, 2008
Grimes C A, Varghese O K, Ranjan S. Light, Water, Hydrogen: The Solar Generation of Hydrogen by Water Photoelectrolysis. New York: Springer, 2008
7
Bhattacharyya R, Misra A, Sandeep K C. Photovoltaic solar energy conversion for hydrogen production by alkaline water electrolysis: conceptual design and analysis. Energy Conversion and Management, 2017, 133: 1–13 https://doi.org/10.1016/j.enconman.2016.11.057
8
Viswanathan B, Subramanian V, Lee J S. Materials and Processes for Solar Fuel Production. New York: Springer, 2014
9
Ge M, Cao C, Huang J, Li S, Chen Z, Zhang K Q, Al-Deyab S S, Lai Y. A review of one-dimensional TiO2 nanostructured materials for environmental and energy applications. Journal of Materials Chemistry. A, 2016, 4(18): 6772–6801 https://doi.org/10.1039/C5TA09323F
10
Pagnout C, Jomini S, Dadhwal M, Caillet C, Thomas F, Bauda P. Role of electrostatic interactions in the toxicity of titanium dioxide nanoparticles toward Escherichia coli. Colloids and Surfaces. B, Biointerfaces, 2012, 92: 315–321 https://doi.org/10.1016/j.colsurfb.2011.12.012
pmid: 22218337
11
Khataee A, Mansoori G A. Nanostructured Materials Titanium Dioxide Properties, Preparation and applications. Singapore: World Scientific, 2012
12
Anpo M, Kamat P V. Environmentally Benign Photocatalysts: Applications of Titanium Oxide-Based Materials. London: Springer, 2010
13
Momeni M M, Ghayeb Y, Ghonchegi Z. Photocatalytic properties of Cr–TiO2 nanocomposite photoelectrodes produced by electrochemical anodisation of titanium. Surface Engineering, 2016, 32(7): 520–525 https://doi.org/10.1179/1743294415Y.0000000061
14
Momeni M M, Ghayeb Y. Photoelectrochemical water splitting on chromium-doped titanium dioxide nanotube photoanodes prepared by single-step anodizing. Journal of Alloys and Compounds, 2015, 637: 393–400 https://doi.org/10.1016/j.jallcom.2015.02.137
15
Momeni M M, Ghayeb Y. Fabrication, characterization and photoelectrochemical performance of chromium-sensitized titania nanotubes as efficient photoanodes for solar water splitting. Journal of Solid State Electrochemistry, 2016, 20(3): 683–689 https://doi.org/10.1007/s10008-015-3093-3
16
Momeni M M. Dye-sensitized solar cell and photocatalytic performance of nanocomposite photocatalyst prepared by electrochemical anodization. Bulletin of Materials Science, 2016, 39(6): 1389–1395 https://doi.org/10.1007/s12034-016-1280-1
17
Momeni M M, Ghayeb Y. Fabrication, characterization and photoelectrochemical behavior of Fe–TiO2 nanotubes composite photoanodes for solar water splitting. Journal of Electroanalytical Chemistry, 2015, 751: 43–48 https://doi.org/10.1016/j.jelechem.2015.05.035
18
Momeni M M, Ghayeb Y. Cobalt modified tungsten–titania nanotube composite photoanodes for photoelectrochemical solar water splitting. Journal of Materials Science Materials in Electronics, 2016, 27(4): 3318–3327 https://doi.org/10.1007/s10854-015-4161-2
19
Ghayeb Y, Momeni M M. Solar water-splitting using palladium modified tungsten trioxide-titania nanotube photocatalysts. Journal of Materials Science Materials in Electronics, 2016, 27(2): 1805–1811 https://doi.org/10.1007/s10854-015-3957-4
20
Momeni M M, Ghayeb Y, Ghonchegi Z. Fabrication and characterization of copper doped TiO2 nanotube arrays by in situ electrochemical method as efficient visible-light photocatalyst. Ceramics International, 2015, 41(7): 8735–8741 https://doi.org/10.1016/j.ceramint.2015.03.094
21
Ge M Z, Cao C Y, Li S H, Tang Y X, Wang L N, Qi N, Huang J Y, Zhang K Q, Al-Deyab S S, Lai Y K. In situ plasmonic Ag nanoparticle anchored TiO2 nanotube arrays as visible-light-driven photocatalysts for enhanced water splitting. Nanoscale, 2016, 8(9): 5226–5234 https://doi.org/10.1039/C5NR08341A
pmid: 26878901
22
Momeni M M, Ghayeb Y. Photoinduced deposition of gold nanoparticles on TiO2-WO3 nanotube films as efficient photoanodes for solar water splitting. Applied Physics. A, Materials Science & Processing, 2016, 122(6): 620 https://doi.org/10.1007/s00339-016-0145-1
23
Momeni M M, Ghayeb Y. Visible light-driven photoelectrochemical water splitting on ZnO–TiO2 heterogeneous nanotube photoanodes. Journal of Applied Electrochemistry, 2015, 45(6): 557–566 https://doi.org/10.1007/s10800-015-0836-x
24
Momeni M M, Ghayeb Y, Davarzadeh M. Single-step electrochemical anodization for synthesis of hierarchical WO3–TiO2 nanotube arrays on titanium foil as a good photoanode for water splitting with visible light. Journal of Electroanalytical Chemistry, 2015, 739: 149–155 https://doi.org/10.1016/j.jelechem.2014.12.030
25
Ge M Z, Li S H, Huang J Y, Zhang K Q, Al-Deyab S S, Lai Y K. TiO2 nanotube arrays loaded with reduced graphene oxide films: facile hybridization and promising photocatalytic application. Journal of Materials Chemistry. A, 2015, 3(7): 3491–3499 https://doi.org/10.1039/C4TA06354F
26
Ge M, Li Q, Cao C, Huang J, Li S, Zhang S, Chen Z, Zhang K, Al-Deyab S S, Lai Y. One-dimensional TiO2 nanotube photocatalysts for solar water splitting. Advancement of Science, 2017, 4(1): 1600152 https://doi.org/10.1002/advs.201600152
pmid: 28105391
27
Beydoun D, Amal R, Low G, McEvoy S. Role of nanoparticles in photocatalysis. Journal of Nanoparticle Research, 1999, 1(4): 439–458 https://doi.org/10.1023/A:1010044830871
28
Iliev V, Tomova D, Rakovsky S, Eliyas A, Puma G L. Enhancement of photocatalytic oxidation of oxalic acid by gold modified WO3/TiO2 photocatalysts under UV and visible light irradiation. Journal of Molecular Catalysis A Chemical, 2010, 327(1–2): 51–57 https://doi.org/10.1016/j.molcata.2010.05.012
29
Lee W J, Shinde P S, Go G H, Ramasamy E. Ag grid induced photocurrent enhancement in WO3 photoanodes and their scale-up performance toward photoelectrochemical H2 generation. International Journal of Hydrogen Energy, 2011, 36(9): 5262–5270 https://doi.org/10.1016/j.ijhydene.2011.02.013
30
Subash B, Krishnakumar B, Pandiyan V, Swaminathan M, Shanthi M. Synthesis and characterization of novel WO3 loaded Ag–ZnO and its photocatalytic activity. Materials Research Bulletin, 2013, 48(1): 63–69 https://doi.org/10.1016/j.materresbull.2012.10.010
31
Khare C, Sliozberg K, Meyer R, Savan A, Schuhmann W, Ludwig A. Layered WO3/TiO2 nanostructures with enhanced photocurrent densities. International Journal of Hydrogen Energy, 2013, 38(36): 15954–15964 https://doi.org/10.1016/j.ijhydene.2013.09.142
32
Rajeshwar K, McConnell R, Licht S. Solar Hydrogen Generation: Toward a Renewable Energy Future. New York: Springer, 2008
33
Choi T, Kim J S, Kim J H. Transparent nitrogen doped TiO2/WO3 composite films for self-cleaning glass applications with improved photodegradation activity. Advanced Powder Technology, 2016, 27(2): 347–353 https://doi.org/10.1016/j.apt.2016.01.005
34
Dozzi M V, Marzorati S, Longhi M, Coduri M, Artiglia L, Selli E. Photocatalytic activity of TiO2-WO3 mixed oxides in relation to electron transfer efficiency. Applied Catalysis B: Environmental, 2016, 186: 157–165 https://doi.org/10.1016/j.apcatb.2016.01.004
35
Srinivasan A, Miyauchi M. Chemically stable WO3 based thin-film for visible light induced oxidation and superhydrophilicity. Journal of Physical Chemistry C, 2012, 116(29): 15421–15426 https://doi.org/10.1021/jp303472p
36
Souvereyns B, Elen K, De Dobbelaere C, Kelchtermans A, Peys N, D’Haen J, Mertens M, Mullens S, Van den Rul H, Meynen V, Cool P, Hardy A, Van Bael M K. Hydrothermal synthesis of a concentrated and stable dispersion of TiO2 nanoparticles. Chemical Engineering Journal, 2013, 223: 135–144 https://doi.org/10.1016/j.cej.2013.02.047
37
Somasundaram S, Chenthamarakshan C R, de Tacconi N R, Basit N A, Rajeshwar K. Composite WO3–TiO2 films: pulsed electrodeposition from a mixed bath versus sequential deposition from twin baths. Electrochemistry Communications, 2006, 8(4): 539–543 https://doi.org/10.1016/j.elecom.2006.01.016
38
Shiyanovskaya I, Hepel M. Bicomponent WO3/TiO2 films as photoelectrodes. Journal of the Electrochemical Society, 1999, 146(1): 243–249 https://doi.org/10.1149/1.1391593
39
Shiyanovskaya I, Hepel M. Decrease of recombination losses in bicomponent WO3/TiO2 films photosensitized with cresyl violet and thionine. Journal of the Electrochemical Society, 1998, 145(11): 3981–3985 https://doi.org/10.1149/1.1838902
40
He T, Ma Y, Cao Y, Hu X, Liu H, Zhang G, Yang W, Yao J. Photochromism of WO3 colloids combined with TiO2 nanoparticles. Journal of Physical Chemistry. B, 2002, 106(49): 12670–12676 https://doi.org/10.1021/jp026031t
41
He Y, Wu Z, Fu L, Li C, Miao Y, Cao L, Fan H, Zou B. Photochromism and size effect of WO3 and WO3-TiO2 aqueous sol. Chemistry of Materials, 2003, 15(21): 4039–4045 https://doi.org/10.1021/cm034116g
42
Paramasivam I, Nah Y C, Das C, Shrestha N K, Schmuki P. WO3/TiO2 nanotubes with strongly enhanced photocatalytic activity. Chemistry (Weinheim an der Bergstrasse, Germany), 2010, 16(30): 8993–8997 https://doi.org/10.1002/chem.201000397
pmid: 20645336
43
Nazari M, Golestani-Fard F, Bayati R, Eftekhari-Yekta B. Enhanced photocatalytic activity in anodized WO3-loaded TiO2 nanotubes. Superlattices and Microstructures, 2015, 80: 91–101 https://doi.org/10.1016/j.spmi.2014.12.008
44
Momeni M, Ghayeb Y. Fabrication, characterization and photocatalytic properties of Au/TiO2-WO3 nanotubular composite synthesized by photo-assisted deposition and electrochemical anodizing methods. Journal of Molecular Catalysis. A: Chemical, 2016, 417: 107–115 https://doi.org/10.1016/j.molcata.2016.03.024
45
Zhong M, Zhang G, Yang X. Preparation of Ti mesh supported WO3/TiO2 nanotubes composite and its application for photocatalytic degradation under visible light. Materials Letters, 2015, 145: 216–218 https://doi.org/10.1016/j.matlet.2015.01.091
46
Ali H, Ismail N, Hegazy A, Mekewi M. A novel photoelectrode from TiO2-WO3 nanoarrays grown on FTO for solar water splitting. Electrochimica Acta, 2014, 150: 314–319 https://doi.org/10.1016/j.electacta.2014.10.142
47
de Tacconi N R, Chenthamarakshan C R, Rajeshwar K, Pauporté T, Lincot D. Pulsed electrodeposition of WO3–TiO2 composite films. Electrochemistry Communications, 2003, 5(3): 220–224 https://doi.org/10.1016/S1388-2481(03)00021-3
48
Ruan C, Paulose M, Varghese O K, Mor G K, Grimes C A. Fabrication of highly ordered TiO2 nanotube arrays using an organic electrolyte. Journal of Physical Chemistry. B, 2005, 109(33): 15754–15759 https://doi.org/10.1021/jp052736u
pmid: 16852999
49
Ali H, Ismail N, Mekewi M, Hengazy A C. Facile one-step process for synthesis of vertically aligned cobalt oxide doped TiO2 nanotube arrays for solar energy conversion. Journal of Solid State Electrochemistry, 2015, 19(10): 3019–3026 https://doi.org/10.1007/s10008-015-2919-3
50
Ma J, Yang M, Sun Y, Li C, Li Q, Gao F, Yu F, Chen J. Fabrication of Ag/TiO2 nanotube array with enhanced photocatalytic degradation of aqueous organic pollutant. Physica E, Low-Dimensional Systems and Nanostructures, 2014, 58: 24–29 https://doi.org/10.1016/j.physe.2013.11.006
51
Li Y, Yu H, Zhang C, Song W, Li G, Shao Z, Yi B. Effect of water and annealing temperature of anodized TiO2 nanotubes on hydrogen production in photoelectrochemical cell. Electrochimica Acta, 2013, 107: 313–319 https://doi.org/10.1016/j.electacta.2013.05.090
52
Xie K, Sun L, Wang C, Lai Y, Wang M, Chen H, Lin C. Photoelectrocatalytic properties of Ag nanoparticles loaded TiO2 nanotube arrays prepared by pulse current deposition. Electrochimica Acta, 2010, 55(24): 7211–7218 https://doi.org/10.1016/j.electacta.2010.07.030
53
Bai S, Liu H, Sun J, Tian Y, Chen S, Song J, Luo R, Li D, Chen A, Liu C C. Improvement of TiO2 photocatalytic properties under visible light by WO3/TiO2 and MoO3/TiO2 composites. Applied Surface Science, 2015, 338: 61–68 https://doi.org/10.1016/j.apsusc.2015.02.103
54
Smith Y R, Sarma B, Mohanty S K, Misra M. Formation of TiO2–WO3 nanotubular composite via single-step anodization and its application in photoelectrochemical hydrogen generation. Electrochemistry Communications, 2012, 19: 131–134 https://doi.org/10.1016/j.elecom.2012.03.023
55
Palmas S, Castresana P A, Mais L, Vacca A, Mascia M, Ricci P C. TiO2–WO3 nanostructured systems for photoelectrochemical applications. RSC Advances, 2016, 6(103): 101671–101682 https://doi.org/10.1039/C6RA18649A
56
Yoong L S, Chong F K, Dutta B K. Development of copper-doped TiO2 photocatalyst for hydrogen production under visible light. Energy, 2009, 34(10): 1652–1661 https://doi.org/10.1016/j.energy.2009.07.024
57
Kuvarega A T, Krause R W M, Mamba B B. Multiwalled carbon nanotubes decorated with nitrogen, palladium co-doped TiO2 (MWCNT/N, Pd co-doped TiO2) for visible light photocatalytic degradation of Eosin Yellow in water. Journal of Nanoparticle Research, 2012, 14(4): 776–791 https://doi.org/10.1007/s11051-012-0776-x
58
Kubelka P, Munk F. A contribution to the look of the paints. Journal of Technical Physics, 1931, 12: 593–601
59
Riboni F, Bettini L G, Bahnemann D W, Selli E. WO3-TiO2 vs. TiO2 photocatalysts: effect of the W precursor and amount on the photocatalytic activity of mixed oxides. Catalysis Today, 2013, 209: 28–34 https://doi.org/10.1016/j.cattod.2013.01.008
60
Park J H, Park O O, Kim S. Photoelectrochemical water splitting at titanium dioxide nanotubes coated with tungsten trioxide. Applied Physics Letters, 2006, 89(16): 163106 https://doi.org/10.1063/1.2357878