Synthesis and properties of a meso- tris–ferrocene appended zinc(<scp>ii</scp>) porphyrin and a critical evaluation of its dye sensitised solar cell (DSSC) performance

Sirbu, Dumitru; Turta, Constantin; Benniston, Andrew C.; Abou‐Chahine, Fawzi; Lemmetyinen, Helge; Tkachenko, Nikolai V.; Wood, Christopher J.; Gibson, Elizabeth A.

doi:10.1039/c4ra03105a

Cited by 49 publications

(38 citation statements)

References 58 publications

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“…The picosecond‐to‐nanosecond TAS experiments were performed by a pump‐probe system consisting of Libra F‐1K (Coherent Inc.) generator producing 100 fs pulses at λ = 800 nm (1 mJ) with a repetition rate of 1 kHz . An optical parametric amplifier (Topas‐C, Light Conversion Ltd.) was used to provide pump pulses at λ = 355 nm.…”

Section: Methodsmentioning

confidence: 99%

Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Barreca

Carraro

Gasparotto

et al. 2015

Adv Materials Inter

113

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Harnessing solar energy for the production of clean hydrogen by photoelectrochemical water splitting represents a very attractive, but challenging approach for sustainable energy generation. In this regard, the fabrication of Fe2O3–TiO2 photoanodes is reported, showing attractive performances [≈2.0 mA cm−2 at 1.23 V vs. the reversible hydrogen electrode in 1 M NaOH] under simulated one‐sun illumination. This goal, corresponding to a tenfold photoactivity enhancement with respect to bare Fe2O3, is achieved by atomic layer deposition of TiO2 over hematite (α‐Fe2O3) nanostructures fabricated by plasma enhanced‐chemical vapor deposition and final annealing at 650 °C. The adopted approach enables an intimate Fe2O3–TiO2 coupling, resulting in an electronic interplay at the Fe2O3/TiO2 interface. The reasons for the photocurrent enhancement determined by TiO2 overlayers with increasing thickness are unraveled by a detailed chemico‐physical investigation, as well as by the study of photogenerated charge carrier dynamics. Transient absorption spectroscopy shows that the increased photoelectrochemical response of heterostructured photoanodes compared to bare hematite is due to an enhanced separation of photogenerated charge carriers and more favorable hole dynamics for water oxidation. The stable responses obtained even in simulated seawater provides a feasible route in view of the eventual large‐scale generation of renewable energy.

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Section: Methodsmentioning

confidence: 99%

Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Barreca

Carraro

Gasparotto

et al. 2015

Adv Materials Inter

113

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“…Among the chromophores used for artificialm odelso fp hotosynthesis, porphyrinoids are the preferred choice, as they are ubiquitous in natural photosynthesis structures. [1,[18][19][20][21][22][23] Phthalocyanine (Pc) compounds enjoy an irreplaceable position in the porphyrinoid family and are considered to be ideal antenna molecules for light-harvesting systems, because of their intense absorption in the red/near-infrared (IR) and visible region. They have two-dimensional 18-p-electron macrocyclic conjugated structures,i nw hich the electrons are uniformly distributed.…”

Section: Introductionmentioning

confidence: 99%

Excited‐State Deactivation of Branched Phthalocyanine Compounds

et al. 2015

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The excited-state relaxation dynamics and chromophore interactions in two phthalocyanine compounds (bis- and trisphthalocyanines) are studied by using steady-state and femtosecond transient absorption spectral measurements, where the excited-state energy-transfer mechanism is explored. By exciting phthalocyanine compounds to their second electronically excited states and probing the subsequent relaxation dynamics, a multitude of deactivation pathways are identified. The transient absorption spectra show the relaxation pathway from the exciton state to excimer state and then back to the ground state in bisphthalocyanine (bis-Pc). In trisphthalocyanine (tris-Pc), the monomeric and dimeric subunits are excited and the excitation energy transfers from the monomeric vibrationally hot S1 state to the exciton state of a pre-associated dimer, with subsequent relaxation to the ground state through the excimer state. The theoretical calculations and steady-state spectra also show a face-to-face conformation in bis-Pc, whereas in tris-Pc, two of the three phthalocyanine branches form a pre-associated face-to-face dimeric conformation with the third one acting as a monomeric unit; this is consistent with the results of the transient absorption experiments from the perspective of molecular structure. The detailed structure-property relationships in phthalocyanine compounds is useful for exploring the function of molecular aggregates in energy migration of natural photosynthesis systems.

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“…将二茂铁通过共轭方式与卟啉连接, 由于二茂铁具有低的氧化电势, 作为电子给体可以将电子传递给卟啉, 从而降低卟啉的氧化电势, 使卟啉更易于氧化; 同时二茂铁的引入还能减小 π 电子的 HOMO 和 LUMO 能级差, 从而改善卟啉类化合物的光吸收及发光性能 [9] . 因此二茂铁修饰卟啉后赋予了卟啉分子新的功能, 常用作性能优良的光敏剂, 在光电功能材料及器件--如通过给受体之间的光诱导电子转移模拟光合反应中心 [10] 、基于多氧化还原中心的光电化学传感及电子器件 [11,12] 、基于多电子氧化还原催化剂 [13,14] 、分子水平的信息存贮 [15] 及主客体化学 [16] 等多领域得到广泛应用. 二茂铁取代卟啉化合物的应用目前仍是人们研究的热点 [17,18] .…”

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Synthesis and Properties of Porphyrin Containing Long Chain Alkylferrocene

Chen¹,

Tuo²,

Liu³

et al. 2016

Chin. J. Org. Chem.

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Synthesis and properties of a meso- tris–ferrocene appended zinc(ii) porphyrin and a critical evaluation of its dye sensitised solar cell (DSSC) performance

Abstract: A zinc(ii) porphyrin derivative, F3P, was prepared containing a single ferrocene group appended at three of the meso positions.

Cited by 49 publications

References 58 publications

Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Excited‐State Deactivation of Branched Phthalocyanine Compounds

Synthesis and Properties of Porphyrin Containing Long Chain Alkylferrocene

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Synthesis and properties of a meso- tris–ferrocene appended zinc(ii) porphyrin and a critical evaluation of its dye sensitised solar cell (DSSC) performance

Abstract: A zinc(ii) porphyrin derivative, F3P, was prepared containing a single ferrocene group appended at three of the meso positions.

Cited by 49 publications

References 58 publications

Fe2O3–TiO2 Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Fe2O3–TiO2 Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Excited‐State Deactivation of Branched Phthalocyanine Compounds

Synthesis and Properties of Porphyrin Containing Long Chain Alkylferrocene

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Product

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Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

Fe₂O₃–TiO₂ Nano‐heterostructure Photoanodes for Highly Efficient Solar Water Oxidation