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Bharat Dhital, Vishal Govind Rao, H Peter Lu
Interfacial charge transfer dynamics in dye-sensitized NiO nanoparticles are being investigated for photocathodes in p-type dye-sensitized solar cells. In the photoreaction, after fast electron transfer from NiO to a molecule, the recombination of the hole in the nanoparticles with the electron in a reduced molecule plays an important role in the charge separation process and solar energy harvesting. Nevertheless, knowledge of the interfacial charge recombination (CR) rate and its mechanism is still limited due to the complex photoinduced electron and hole dynamics and lack of characterization of the inhomogeneity of the dynamics...
June 22, 2017: Physical Chemistry Chemical Physics: PCCP
Junting Wang, Heng Wu, Linrui Jin, Jing Zhang, Yi Yuan, Peng Wang
The continuing efforts of creating novel polycyclic aromatic hydrocarbons (PAHs) and exploiting them as the crucial building-blocks of organic donor-acceptor (D-A) dyes with excellent excited state features, should bring an unprecedented chance for the improvement of power conversion efficiency (PCE) of dye-sensitized solar cells (DSCs). In this paper we report a nonacyclic aromatic hydrocarbon, N-annulated benzoindenopentaphene (NBIP), which can be tethered with multiple solubilizing groups including one 2-hexyldecyl, one 2-hexyldecyloxy, and four 4-hexylphenyl substituents...
June 20, 2017: ChemSusChem
Xindong Wang, Rashid R Valiev, Tymish Y Ohulchanskyy, Hans Ågren, Chunhui Yang, Guanying Chen
Lanthanide-doped upconversion nanoparticles (UCNPs) are promising for applications as wide as biological imaging, multimodal imaging, photodynamic therapy, volumetric displays, and solar cells. Yet, the weak and narrow absorption of lanthanide ions poses a fundamental limit of UCNPs to withhold their brightness, creating a long-standing hurdle for the field. Dye-sensitized UCNPs are emerging to address this performance-limiting problem, yielding up to thousands-fold brighter luminescence than conventional UCNPs without dye sensitization...
June 16, 2017: Chemical Society Reviews
Rebecca J Kamire, Marek B Majewski, William L Hoffeditz, Brian T Phelan, Omar K Farha, Joseph T Hupp, Michael R Wasielewski
The design of efficient hydrogen-evolving photocathodes for dye-sensitized photoelectrochemical cells (DSPECs) requires the incorporation of molecular light absorbing chromophores that are capable of delivering reducing equivalents to molecular proton reduction catalysts at rates exceeding those of charge recombination events. Here, we report the functionalization and kinetic analysis of a nanostructured NiO electrode with a modified perylene-3,4-dicarboximide chromophore (PMI) that is stabilized against degradation by atomic layer deposition (ALD) of thick insulating Al2O3 layers...
January 1, 2017: Chemical Science
Ya Zheng, Jinming Wang, Jing Zhang, Tianyou Peng, Renjie Li
A series of asymmetric zinc porphyrin (ZnPy) derivatives bearing different external substituents were synthesized and used to sensitize Pt-loaded graphitic carbon nitride (Pt/g-C3N4) for photocatalytic H2 production. Among them, ZnPy-1 has one benzoic acid and three phenyls as peripheral substituents, while ZnPy-2, ZnPy-3, and ZnPy-4 contain one benzoic acid and three pseudo-pyridines with different N-atom positions. The experimental results indicate that the pseudo-pyridine substitution for the phenyls in ZnPy-1 lead to enhanced photosensitization with an order of ZnPy-1 < ZnPy-2 < ZnPy-3 < ZnPy-4 under visible light (λ > 420 nm) irradiation...
June 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Wenjing Hou, Yaoming Xiao, Gaoyi Han
The ternary iron group thiospinels of metal diindium sulfides (MIn2S4, M = Fe, Co, Ni) with the vertically aligned nanosheets array structure are fabricated through in situ solvothermal method on F-doped tin oxide substrates, which are employed as one type of platinum (Pt) free counter electrodes (CEs) in the structure-dependent dye-sensitized solar cells (DSSCs). DSSC assembled with ternary CoIn2S4 CE achieves an photoelectric conversion efficiency (PCE) of 8.83%, outperforming than that of FeIn2S4 (7.18%) and NiIn2S4 (8...
June 13, 2017: Angewandte Chemie
Palraj Ranganathan, Ragu Sasikumar, Shen-Ming Chen, Syang-Peng Rwei, Pedaballi Sireesha
We applied the nitrogen-doped graphene@nickel oxide (NGE/NiO) nanocomposite doped TiO2 as a photo-anode for dye-sensitized solar cells (DSSCs) on fluorine-doped tin oxide (FTO) substrates by screen printing method. Power conversion efficiency (PCE) of 9.75% was achieved for this DSSCs device, which is greater than that of DSSCs devices using GO/TiO2, and NiO/TiO2 based photo-anodes (PCE=8.55, and 9.11%). Also, the fill factor (FF) of the DSSCs devices using the NGE/NiO/TiO2 nanocomposite photo-anode was better than that of other photo-anodes...
June 10, 2017: Journal of Colloid and Interface Science
Laura Casarin, Wesley B Swords, Stefano Caramori, Carlo A Bignozzi, Gerald J Meyer
An anionic Co(II) complex, [Co(TTT) (NCS)3](-) (TTT = 4,4',4″-tri-tert-butyl-2,2':6',2″-terpyridine and NCS = isothiocyanate), was synthesized for use in dye-sensitized solar cells (DSSCs). The Co(II) complex was found to ion-pair with the hexacationic sensitizer [Ru(tmam)2(dcb)](6+) (tmam = 4,4'-bis(trimethylaminomethyl)-2,2'-bipyridine and dcb = 4,4'-(CO2H)2-2,2'-bipyridine) anchored to TiO2 thin films immersed in acetonitrile solution. Visible light excitation of the ion pairs resulted in excited-state injection followed by rapid static regeneration of the oxidized sensitizer (<10 ns)...
June 12, 2017: Inorganic Chemistry
J Falgenhauer, F Fiehler, C Richter, M Rudolph, D Schlettwein
The well-established indoline dye D149 and three indoline dyes with improved binding stability (DN91, DN216 and DN285) were used as sensitizers for electrodeposited porous ZnO and studied in dye-sensitized solar cells and showed very similar cell characteristics. After storage of the cells in the dark for four weeks, an increase in short-circuit current density was observed. Electrochemical impedance spectroscopy served to detect a shift of the conduction band edge energy to lower energies and, hence, an increased injection efficiency of electrons from the excited state of the sensitizer to the ZnO conduction band is detected as the main cause of this change...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
Yiming Cao, Yasemin Saygili, Amita Ummadisingu, Joël Teuscher, Jingshan Luo, Norman Pellet, Fabrizio Giordano, Shaik Mohammed Zakeeruddin, Jacques-E Moser, Marina Freitag, Anders Hagfeldt, Michael Grätzel
Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nanopore filling, low conductivity and crystallization of hole-transport materials infiltrated in the mesoscopic TiO2 scaffolds, leading to low performances. Here we report a record 11% stable solid-state dye-sensitized solar cell under standard air mass 1.5 global using a hole-transport material composed of a blend of [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)2 and [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)...
June 9, 2017: Nature Communications
Okta Suryani, Yuta Higashino, Jacob Yan Mulyana, Masayoshi Kaneko, Takayuki Hoshi, Koichiro Shigaki, Yuji Kubo
Dye-sensitized photoelectrochemical cells (DSPECs) composed of a new near-infrared BODIPY dye D1 that is co-deposited with a ruthenium water oxidation catalyst C1 have been fabricated. The devices at pH 7.2 showed an excellent Faradaic efficiency of H2 production (65.8%) that was 5.4 times larger than that of a triphenylamine photosensitizer D2 and C1-coadsorbed cell.
June 9, 2017: Chemical Communications: Chem Comm
Da Hyun Song, Ho-Sub Kim, Jung Sang Suh, Bong-Hyun Jun, Won-Yeop Rho
The use of dye-sensitized solar cells (DSSCs) is widespread owing to their high power conversion efficiency (PCE) and low cost of manufacturing. We prepared multi-shaped Ag nanoparticles (NPs) and introduced them into DSSCs to further enhance their PCE. The maximum absorption wavelength of the multi-shaped Ag NPs is 420 nm, including the shoulder with a full width at half maximum (FWHM) of 121 nm. This is a broad absorption wavelength compared to spherical Ag NPs, which have a maximum absorption wavelength of 400 nm without the shoulder of 61 nm FWHM...
June 4, 2017: Nanomaterials
Vediappan Sudhakar, Arulraj Arulkashmir, Kothandam Krishnamoorthy
Dye regeneration was improved by using an optimum quantity of graphene, which was dispersed in a polymer that suppresses back electron transfer. Using this approach, DSSCs with an efficiency of 10.4% have been fabricated.
June 16, 2017: Chemical Communications: Chem Comm
Xiaoyu Li, Shiqing Li, Ge Gao, Di Wu, Jingbo Lan, Ruilin Wang, Jingsong You
A new type of water-soluble ruthenium sensitizers incorporating imidazolium counterions, denoted [DMPI]2 -Ru and [DMHI]2 -Ru, has been developed, which can be efficiently adsorbed onto TiO2 photoanodes in aqueous solution. Owing to the good thermal stability of imidazolium, [DMPI]2 -Ru adsorbed on TiO2 has a higher decomposition temperature than N719 dye [di(tetrabutylammonium) cis-di(thiocyanato)bis(2,2'-bipyridine-4,4'-dicarboxylato)ruthenium(II)]. When using organic solvent-based I(-) /I3(-) electrolytes, solars cell based on [DMPI]2 -Ru-sensitized TiO2 in water show high power conversion efficiencies (PCE) of up to 10...
June 4, 2017: ChemSusChem
Yue Li, Wenjie Zhao, Mengzhen Li, Gang Chen, Wang Xiaofeng, Xueqi Fu, Osamu Kitao, Hitoshi Tamiaki, Tokowa Sakai, Toshitaka Ikeuchi, Shin-Ichi Sasaki
We demonstrate solid-state chlorophyll solar cells (CSCs) employing a carboxylated chlorophyll derivative, methyl trans-32-carboxy-pyropheophorbide a as a light-harvesting dye sensitizer chlorophyll (DSC) deposited on mesoporous TiO2, on which four zinc hydroxylated chlorophyll derivatives were spin-coated for hole transporter chlorophylls (HTCs). The key parameters including the effective carrier mobility of the HTC films determined by the space charge-limited current method and the frontier molecular orbitals of these DSC and HTCs estimated from the cyclic voltammetry and the electronic absorption spectra suggest that both their charge separation and carrier transport are favorable...
June 3, 2017: Chemistry: a European Journal
Jie Yin, Yuqiao Wang, Wenfei Meng, Tianyue Zhou, Baosong Li, Tao Wei, Yueming Sun
The honeycomb-like nickel cobalt sulfide (NiCo2S4) nanosheets was directly deposited on the fluorine-doped tin oxide substrate by a rapid voltammetric deposition method. The method was also controllable and feasible for preparing NiCo2S4 on the flexible Ti foil without any heating processes. Compared with Pt, CoS and NiS, NiCo2S4 exhibited the low charge-transfer resistances and excellent electrocatalytic activity for the I3- reduction, acting as a counter electrode for dye-sensitized solar cell. The NiCo2S4-based solar cell showed higher power conversion efficiency (7...
June 2, 2017: Nanotechnology
Marcos A Santana Andrade, Armi Tiihonen, Kati Miettunen, Peter Lund, Ana F Nogueira, Heloise O Pastore
Organic-inorganic hybrid layered materials are proposed as additives in a quasi-solid gel electrolyte for dye-sensitized solar cells. Talcs could provide a low-cost and environmentally friendly, as well as abundant, option as gelators. Here, talcs were prepared by functionalizing an organotalc with three polyamidopyridine dendron generations, PAMPy-talc-Gn (n = 1, 2 and 3). PAMPy dendrons grow parallel to the lamellae plane and form an organized structure by intermolecular interactions. In addition, polyiodide-dendron charge-transfer complexes were prepared onto the organotalc by adsorption of iodine...
June 21, 2017: ACS Applied Materials & Interfaces
Hyun-Jun Hwang, Sung-Jun Joo, Supriya A Patil, Hak-Sung Kim
In this work, we describe the efficiency enhancement in dye-sensitized solar cells (DSSCs) by using TiO2/silver nanoplate plasmonic nanocomposite photoanodes. The nanocomposite photoanodes with tunable plasmonic properties assembled from shape/size-selected silver (Ag) nanoplates were applied to enhance the light absorption for high-performance DSSCs. It was found that the localized surface plasmon resonance can be tuned over a range from 500 to 1000 nm, which is strongly dependent on the shape and size of Ag nanoplates and the refractive index of the surrounding dielectric...
June 2, 2017: Nanoscale
Tran Nam Trung, Dong-Ok Kim, Jin-Hyung Lee, Van-Duong Dao, Ho-Suk Choi, Eui-Tae Kim
We present a simple, ultrasonic vibration-assisted lift-off-based patterning approach for graphene and graphene-Ag nanowire (NW) hybrid films. A 20 μm width pattern with uniform and smooth pattern edges was neatly defined on various rigid and flexible substrates. The patterned graphene-Ag NW electrodes showed a low sheet resistance of 19 Ω/sq with a high transmittance of 93% at 550 nm, a robust stability against oxidation, and a high reliability under a bending test. The electrodes also exhibited markedly higher performance than that of commercial fluorine-doped tin oxide electrodes for dye-sensitized solar cells...
June 14, 2017: ACS Applied Materials & Interfaces
Ravi Ashwini, S Vijayanand, J Hemapriya
Haloarchaea are known for its adaptation in extreme saline environment. Halophilic archaea produces carotenoid pigments and proton pumps to protect them from extremes of salinity. Bacteriorhodopsin (bR) is a light-driven proton pump that resides in the membrane of haloarchaea Halobacterium salinarum. The photocycle of Bacteriorhodopsin passes through several states from K to O, finally liberating ATP for host's survival. Extensive studies on Bacteriorhodopsin photocycle has provided in depth knowledge on their sequential mechanism of converting solar energy into chemical energy inside the cell...
June 2, 2017: Current Microbiology
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