Enhanced Visible Photovoltaic Response of TiO<sub>2</sub> Thin Film with an All-Inorganic Donor–Acceptor Type Polyoxometalate

Li, Jiansheng; Sang, Xiao‐Jing; Chen, Weilin; Zhang, Lancui; Zhu, Zai‐Ming; Ma, Tengying; Su, Zhong‐Min; Wang, Enbo

doi:10.1021/acsami.5b03948

Cited by 82 publications

(44 citation statements)

References 61 publications

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“…Al is used as the reductant, which is due to its Fermi level higher than the LUMO level of the above POMs except POM 8, and the nanometer thickness reductant metal Al is the air‐stable metal material . The energy levels involving the LUMO and the HOMO of the POMs (or HPBs) in this paper have been reported . The structure of the film may affect the existence of POMs and HPBs in the membrane electrode.…”

Section: Resultsmentioning

confidence: 74%

“…While compared with the TiO 2 /SiW 9 Co 3 , there is no significant change in photocurrent after evaporating the reducing agent of Al, because the SiW 9 Co 3 cannot be reduced by Al. Overall, it generally influences on the increasing of the photocurrent of TiO 2 , which probably results from the photocurrent of SiW 9 Co 3 excited by visible light . The remarkable stability and attracting photoresponse activity of the nanocomposite films of HPBs‐TiO 2 electrode endow this novel photosensitive materials with potential application and research significance.…”

Section: Resultsmentioning

confidence: 96%

“…In addition, there are two evident peaks at lower binding energy of W 4f 7/2 = 34.9 eV and W 4f 5/2 = 37.0 eV (with a peak ratio of 4:3) in all the figures except Figure h, which are associated with the reduction state (W V ) ions on the film surface, indicating that these POMs films are reduced by Al to form HPBs films . However, the LUMO energy level of SiW 9 Co 3 (POM 8) is higher than the Fermi energy level of Al, which means that SiW 9 Co 3 cannot be reduced by Al, so the peaks at 34.9 and 37.0 eV are absent in Figure h . In addition, there is the similar area of the peaks at lower binding energy in the XPS spectra of both POMs 1 and 2, indicating that POMs 1 and 2 almost possess the same reduction degree, which may be adequately increased for POM 3 and POM 7.…”

Section: Resultsmentioning

confidence: 99%

“…Following, we achieved a sandwich‐type functionalized [C(NH 2 ) 3 ] 10 [Mn 2 {Sn(CH 2 ) 2 COOH} 2 (B‐α‐GeW 9 O 34 ) 2 ]∙8H 2 O as the photosensitizer in DSSCs, the PCE of which is 0.22% . Additionally, we studied the energy band structures of 13 kinds of POMs, and the TiO 2 film modified by SiW 9 Co 3 exhibits higher visible photovoltaic and photocurrent response . Then SiW 9 Co 3 as a cosensitizer was introduced into the quantum dot sensitized solar cells, and the PCE was improved by 32.33% compared to the pure cadmium selenide (CdSe)‐sensitized cells .…”

Section: Introductionmentioning

confidence: 99%

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A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

Chen

et al. 2018

Advanced Optical Materials

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which should have wide spectrum absorptions, anchoring groups, and appropriate energy levels in order to absorb more sunlight and excite the ground-state electrons to the excited state, then inject into the semiconductor conduction band, while the holes remain in the dye molecule form the charge separations, which ensure the effective regenerations of the photosensitizers and the unidirectional electron injections. [2] In recent decades, great efforts have been made to develop the photosensitizers with high stability, low-cost, and high solar energy conversion in the fields of photocatalysts and solar cells. [3,4] However, developing broad-spectrum photosensitizers is still a big challenge. At present, the commonly used photosensitizers including ruthenium-pyridine, porphyrin, and pure organic dyes, have efficiently improved the power conversion efficiencies (PCEs) of the DSSCs. [5] However, their large-scale productions and applications in photovoltaic industry have been limited by their high costs and the cumbersome process in the synthesis and purification of photosensitizers. [6] Furthermore, the defects of some photosensitizers in spectral absorption also restrict the utilization of sunlight. So, it is urgent to develop the photosensitizers with environment-friendly, simple preparations, low costs, and wide spectra absorptions.Heteropoly blues (HPBs) is a reductive state of polyoxometalates (POMs representing oxidation state) with fascinating structures, abundant element compositions, reversible redox properties, and wide pH stability. [7,8] The advantages of HPBs as photosensitizer are as follows: i) their wide and strong spectral absorptions in visible and near-IR regions; ii) the anchoring groups are easily to coordinated to HPBs to firmly adsorb on the semiconductor surface; iii) their energy levels involving the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) can be adjusted by the composition, structure, and charge density to ensure the effective unidirectional electron injections and photosensitizer regenerations; [9] iv) their excellent light, thermal and electrochemical stability, their ability to accept or lose "blue" electrons without any structural transformations. As a kind of the potential photosensitizer candidates, HPBs have been increasingly recognized in terms of photocatalysis and solar cells. [10][11][12][13][14] However, the instability of HPBs in the air restricts the further research of their photosensitivity and their use as the photosensitizers in DSSCs.The photosensitizer is the soul of dye-sensitized solar cells (DSSCs), i.e., the key factor influencing the performance of DSSCs. The commonly used photo sensitizers are expensive carboxylic pyridine ruthenium-based complexes, so it is urgent to develop low-cost photosensitizers. Heteropoly blues (HPBs) could be a kind of excellent photosensitizers due to their wide spectra absorption; however, most of them are hardly stable in the air. Here, a strategy of combining the improved vacuum...

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

Chen

et al. 2018

Advanced Optical Materials

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“…Titanium dioxide (TiO 2 ) is one of the most important oxide semiconductors due to its excellent optical transmittance, high reflective index, low absorption, high thermal stability, nontoxicity, and moderate cost . All of these favorable properties render TiO 2 as a material suitable for various applications including pigments, absorbents, photocatalysis and photovoltaics, dye‐sensitized solar cells, photosensors, water splitting, self‐cleaning surfaces, and so on …”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on UV‐visible absorption and photoluminescence behavior of liquid phase deposited TiO₂ nanorods

Sadeghzadeh‐Attar

Bafandeh

2019

Int J Applied Ceramic Tech

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In this work, anatase and rutile TiO 2 nanorods were fabricated using one-step liquid phase deposition process, followed by heat treatment in the range 300-800°C.The direct and indirect band gap of the TiO 2 nanorods was estimated form optical absorption data which illustrated a red shift at higher temperatures owing to the different nature of excitons in anatase and rutile phases. The photoluminescence (PL) spectra revealed the presence of two main emission bands consisting of four peaks.It was found that two high-energy peaks located at 2.95-3.30 eV could be generated from exciton transitions from the conduction band to the valence band of TiO 2 nanorods, while two low-energy peaks located at 2.43-2.64 eV may arise from surface state transitions. The PL intensity firstly increased with temperature and at 500°C reached a maximum value, then decreased through increasing temperature up to 800°C. These variations in the intensity of PL emission could be explained in terms of changes in phase structure, crystallinity, and amount of the oxygen vacancies, which are all dependent to the annealing temperature based on X-ray diffractometer and X-ray photoelectron spectrometer studies. These results indicated that annealing temperature allows to manipulate the properties of TiO 2 nanorods for opto-electronic applications. K E Y W O R D Sannealing temperature, photoluminescence, polycrystalline TiO 2 nanorods, UV-visible absorption, XPS analysis 2430 |

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Designing “Core–Shell” Insoluble‐SiW₁₁Fe@δ‐Bi₂O₃ Z‐Scheme Heterojunction for Photo‐Driven Nitrogen Reduction Reaction and Evaluating the Impact of Oxygen toward Nitrogen Reduction

Yang

Zhao

Liu

et al. 2022

Adv Materials Inter

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Photo‐driven nitrogen fixation is regarded as a promising sustainable strategy to generate low‐concentration NH3/NH4+. Insoluble SiW11Fe@δ‐Bi2O3 with “core–shell” structure and Z‐scheme featured heterojunction is constructed under solvothermal conditions. Chemisorption of nitrogen improves significantly due to increased oxygen vacancies on δ‐Bi2O3 as induced by insoluble SiW11Fe salt. Z‐scheme heterojunction is suggested according to energy diagram analyses and electron paramagnetic resonance spin‐trapping experiments, which can be well correlated to enhanced transient photocurrent and catalytic efficacy. [Ru(bpy)3]2+ counter ion in the composite acts as a photosensitizer, leading to improved light harvesting. These merits account for superior performance of Ru2.5SiW11Fe@δ‐Bi2O3. NH3/NH4+ production rate of 121 µmol gcat−1 h−1 is achieved under simulated sunlight irradiation in nitrogen atmosphere, but reduces on switching to air. The impact of oxygen over nitrogen reduction is investigated, and productions of both NH3/NH4+ and H2O2 are evaluated when using gas mixture feedstock with different V(N2):V(O2) ratios. The performance of nitrogen reduction depends mainly on its volume ratio in mixture feedstock, in addition to reduction capability of photocatalyst. By reducing the latter one appropriately, nitrogen reduction would be slightly favored when using air as feedstock.

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Enhanced Visible Photovoltaic Response of TiO₂ Thin Film with an All-Inorganic Donor–Acceptor Type Polyoxometalate

Cited by 82 publications

References 61 publications

A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

Effect of annealing on UV‐visible absorption and photoluminescence behavior of liquid phase deposited TiO₂ nanorods

Designing “Core–Shell” Insoluble‐SiW₁₁Fe@δ‐Bi₂O₃ Z‐Scheme Heterojunction for Photo‐Driven Nitrogen Reduction Reaction and Evaluating the Impact of Oxygen toward Nitrogen Reduction

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Enhanced Visible Photovoltaic Response of TiO2 Thin Film with an All-Inorganic Donor–Acceptor Type Polyoxometalate

Cited by 82 publications

References 61 publications

A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations

Effect of annealing on UV‐visible absorption and photoluminescence behavior of liquid phase deposited TiO2 nanorods

Designing “Core–Shell” Insoluble‐SiW11Fe@δ‐Bi2O3 Z‐Scheme Heterojunction for Photo‐Driven Nitrogen Reduction Reaction and Evaluating the Impact of Oxygen toward Nitrogen Reduction

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Enhanced Visible Photovoltaic Response of TiO₂ Thin Film with an All-Inorganic Donor–Acceptor Type Polyoxometalate

Effect of annealing on UV‐visible absorption and photoluminescence behavior of liquid phase deposited TiO₂ nanorods

Designing “Core–Shell” Insoluble‐SiW₁₁Fe@δ‐Bi₂O₃ Z‐Scheme Heterojunction for Photo‐Driven Nitrogen Reduction Reaction and Evaluating the Impact of Oxygen toward Nitrogen Reduction