TiO2 film decorated with highly dispersed polyoxometalate nanoparticles synthesized by micelle directed method for the efficiency enhancement of dye-sensitized solar cells

He, Lifei; Chen, Li; Zhao, Yüe; Chen, Weilin; Shan, Chunhui; Su, Zhong‐Min; Wang, Enbo

doi:10.1016/j.jpowsour.2016.07.085

Cited by 23 publications

(18 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When sensitized on the ZnO substrate in a dye‐sensitized solar cell photoanode, the SiW 12 ‐based polyoxometalate enhances the overall devices performance, which is ascribed to the efficient electron transfer from the polyoxometalate to ZnO . The employment of a cesium dodecyl sulfate‐based surfactant directs the growth of the Keggin‐type polyoxotungstate H 3 PW 12 O 40 ·xH 2 O and H 4 SiW 12 O 40 ·xH 2 O on TiO 2 for light absorbing and charge transfer purposes (Figure 6b), and the homodispersed polyoxometalate on TiO 2 enhances the solar cell performance and methanol oxidation . Two new armtype polyoxometalates based on P 2 W 15 is attached on TiO 2 , leading to enhanced photocurrents .…”

Section: Polyoxotungstatementioning

confidence: 99%

See 1 more Smart Citation

Polyoxometalates: Tailoring metal oxides in molecular dimension toward energy applications

Zhang

Chen

2020

Int J Energy Res

View full text Add to dashboard Cite

Summary Polyoxometalates could be viewed as the molecular counterpart of the metal oxides, which are essential ingredients for various energy conversion and storage applications. In this manuscript, we review the progress of engineering functional polyoxometalates toward energy applications, focusing on, but not limited to, polyoxotitanate, polyoxotungstate, and polyoxomolybdate. These polyoxometalates are considered to be promising candidates for dye‐sensitized solar cell, perovskite solar cell, lithium‐ion battery, lithium‐sulfur battery, supercapacitor, and water‐splitting system. We believe advanced energy devices with better performance could be derived from further engineering the polyoxometalates owing to their molecular design flexibility.

show abstract

Section: Polyoxotungstatementioning

confidence: 99%

“…Reproduced with permission from He et al 175 Copyright Elsevier (2016). 175 (c) Polyoxotungstate sensitized on TiO 2 nanotube in a solar cell with proper energy level alignment. Reproduced with permission from Liu et al 176 Copyright Elsevier (2017).…”

Section: Polyoxonickelatementioning

confidence: 99%

Polyoxometalates: Tailoring metal oxides in molecular dimension toward energy applications

Zhang

Chen

2020

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…The P25 electrode in combination with N719 shows short-cir- Figure 5. [26] The high dispersion of POMs providesm ore active sites than pure POMs which tend to agglomerate, andm ore electrons could be injected andc ollected, resulting in the improvements of J sc .A ccordingly,t he J sc of P 2 W 18 ·NiO@TiO 2 cell is increased from 17.42 to 17.68 mA cm À2 comparedw ith that of P 2 W 18 @TiO 2 cell. Elements include:(b) P, (c)W ,( d) Ti,a nd (e) Cu.…”

Section: Photocurrent-voltage(j-v) Curve Analysismentioning

confidence: 99%

“…R s is the ohmic series resistance of the cell. [26] As shown in Figures 8c and d, the R ct values of different DSSCs display the reduction in the order:P 25 < CuO@TiO 2 < P 2 W 18 @TiO 2 < P 2 W 18 ·CuO@TiO 2 and P25 < NiO@TiO 2 < P 2 W 18 @TiO 2 < P 2 W 18 ·NiO@TiO 2 ,r espectively.T hese resultsi ndicate the performance of NiO@TiO 2 /DSSC is better than the performance of CuO@TiO 2 /DSSC, owing to their differences in R ct . The first arc in the high frequency range of the Nyquist plots (Figure 8c)m atches to the electron-transferp rocess at the counter electrode-electrolyte interface (R pt ).…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…[13] Using an electron acceptora st he dopant to load onto the TiO 2 photoanode could retard the charger ecombination. [24][25][26][27] POMs,a saclass of inorganic anionic clusters, have been extensively applied in magnetism, materials science, nonlinear optics, electrical, catalysis, optical, energy,a nd medicineo wing to their redox properties, charged istribution, versatile properties, and rich topology. [20][21][22][23] Recently,p olyoxometalate (POM)h as been confirmed to act as an effective electron-transfer mediator for retarding charge pair recombination and improving the PCE of DSSCs,w here it is used as the dopant to load on the TiO 2 photoanode.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Strategy for Breaking Polyoxometalate‐based MOFs To Obtain High Loading Amounts of Nanosized Polyoxometalate Clusters to Improve the Performance of Dye‐sensitized Solar Cells

Zheng

Chen

et al. 2017

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

Polyoxometalates (POM) have already been confirmed to act as effective electron-transfer mediators for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) based on previous studies. However, the improvement may be limited by the agglomeration of the polyoxoanions. In this paper, the previous synthesis strategy is improved upon by breaking the metal-organic frameworks (MOFs) with POMs as the secondary building units ([Ni(bpp)(H O) ] [P W O ]⋅24 H O (1) (bpp=1,3-bis(4-pyridyl)propane) and H [Cu (H O) (P W O ) (3-dpye) ]⋅28 H O (2) (3-dpye=N,N'-bis(3-pyridinecarboxamide)-1,2-ethane)) to design and synthesize small sized and highly disperse POM nanoparticles by means of compositing with TiO , through calcination to remove the organic ligand. TEM and element mapping confirm that P W O (denoted as P W ) nanoparticles with the diameter of ≈1 nm are uniformly distributed in TiO composites. The loading amount (wt. %) of POM in MOFs reaches 75.67 %. The small sized and highly disperse P W nanoparticles may provide more active sites and specific surface areas for improving the PCE of DSSCs. Finally, the investigations indicate that the PCE of composite P W ⋅NiO@TiO photoanodes is up to 7.56 %, which was 26 % higher than the pristine TiO based photoanodes.

show abstract

Polyoxometalates on Functional Substrates: Concepts, Synergies, and Future Perspectives

et al. 2020

View full text Add to dashboard Cite

POMs were studied as heterogeneous acid catalysts and oxidation catalysts. However, this approach is often affected by low specific surface areas, leading to reduced reactivity. [10] Later studies, therefore, pioneered the immobilization of POMs on high surfacearea substrates including porous silica and other metal oxides, [10] as well as more advanced materials such as carbon nanostructures [11] and metal-organic frameworks (MOFs). [9] This strategy can enable maximized exposure of the individual POM molecules to the reaction environment, and in addition, allows for facile separation by filtration or centrifugation. [12] While early studies on POM immobilization used heterogeneous supports for mechanical stabilization and maximized surface-area, more recent studies have moved toward added properties introduced by the support. These include light-absorption and charge transport by semiconductors (TiO 2 , CdSe, etc.), electrical conductivity (by carbons, metals, conductive polymers) as well as specific POM binding sites, as introduced in MOFs and organofunctionalized supports. Many contemporary studies in this field share a common interest in exploring the synergism between POM and substrate to tune and optimize reactivity and stability of the composite. The concept has been theoretically and experimentally described several decades ago as the so-called "microenvironment effect" (electronic charge enhancement) where entrapment of POM species in a 3D matrix has been shown to induce huge improvement of their electrocatalytic activity. [13][14][15] However, to-date, the understanding of the fundamental processes which govern synergism of POM-substrate interactions is still in its infancy, as mole cular-level understanding of these complex processes by experiment or theory is far from trivial. This is due to the vast number of materials combinations, which are currently studied, and is further complicated by the often unknown chemical structures of the POM-substrate interface which make theoretical studies difficult. Also, in situ/operando studies of these materials are still challenging, and instrumentational approaches to address these issues are still being developed and not widely available. Most current experimental studies, therefore, focus on macroscopic reactivity, while providing less insight into the underlying causes of the processes observed.This Progress Report aims at raising awareness of the vast benefits of exploring this under-researched area to enable full use of POM-substrate interactions including charge and energy transfer, band-gap, and frontier orbital alignment as well as interface design for stability and reactivity. These fundamental concepts can affect both the thermodynamics as well as the kinetics of the chemical processes studied so that new reactivity can be tailored by understanding of the interactions between POM and substrate. Given the fast-paced progress in the synthesis, application, and characterization of this materials class, this Progress Report will serve as a focal point for ...

show abstract

TiO2 film decorated with highly dispersed polyoxometalate nanoparticles synthesized by micelle directed method for the efficiency enhancement of dye-sensitized solar cells

Cited by 23 publications

References 45 publications

Polyoxometalates: Tailoring metal oxides in molecular dimension toward energy applications

Polyoxometalates: Tailoring metal oxides in molecular dimension toward energy applications

A Strategy for Breaking Polyoxometalate‐based MOFs To Obtain High Loading Amounts of Nanosized Polyoxometalate Clusters to Improve the Performance of Dye‐sensitized Solar Cells

Polyoxometalates on Functional Substrates: Concepts, Synergies, and Future Perspectives

Contact Info

Product

Resources

About