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https://www.readbyqxmd.com/read/28727458/unraveling-the-high-voc-and-high-performance-of-integrated-perovskite-organic-bulk-heterojunction-solar-cells
#1
Shiqi Dong, Yongsheng Liu, Ziruo Hong, En-Ping Yao, Pengyu Sun, Lei Meng, Yuze Lin, Jinsong Huang, Gang Li, Yang Yang
We have demonstrated high performance integrated perovskite/bulk-heterojunction (BHJ) solar cells due to the low carrier recombination velocity, high open circuit voltage (Voc) and increased light absorption ability in near-infrared (NIR) region of integrated devices. In particular, we find that the Voc of the integrated devices is dominated by (or pinned to) the perovskite cells, not the OPV cells. A Quasi-Fermi Level Pinning Model was proposed to understand the working mechanism and the origin of the Voc of the integrated perovskite/BHJ solar cell, which following that of the perovskite solar cell and is much higher than that of the low bandgap polymer based organic BHJ solar cell...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28727193/hydrogen-bonded-polymer-porphyrin-assemblies-in-water-supramolecular-structures-for-light-energy-conversion
#2
Anne Kutz, Wiebke Alex, Anja Krieger, Franziska Gröhn
In this study, a new type of functional, self-assembled nanostructure formed from porphyrins and polyamidoamine dendrimers based on hydrogen bonding in an aqueous solution is presented. As the aggregates formed are promising candidates for solar-energy conversion, their photocatalytic activity is tested using the model reaction of methyl viologen reduction. The self-assembled structures show significantly increased activity as compared to unassociated porphyrins. Details of interaction forces driving the supramolecular structure formation and regulating catalytic efficiency are fundamentally discussed...
July 20, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28726745/dual-source-linear-energy-prediction-line-p-model-in-the-context-of-wsns
#3
Faisal Ahmed, Gert Tamberg, Yannick Le Moullec, Paul Annus
Energy harvesting technologies such as miniature power solar panels and micro wind turbines are increasingly used to help power wireless sensor network nodes. However, a major drawback of energy harvesting is its varying and intermittent characteristic, which can negatively affect the quality of service. This calls for careful design and operation of the nodes, possibly by means of, e.g., dynamic duty cycling and/or dynamic frequency and voltage scaling. In this context, various energy prediction models have been proposed in the literature; however, they are typically compute-intensive or only suitable for a single type of energy source...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726671/in-situ-decoration-of-plasmonic-au-nanoparticles-on-graphene-quantum-dots-graphitic-carbon-nitride-hybrid-and-evaluation-of-its-visible-light-photocatalytic-performance
#4
Biswajit Choudhury, Pravat Kumar Giri, Rajender Gone
This work spotlights the development of a plasmonic photocatalyst showing surface plasmon induced enhanced visible light photocatalytic performance. Plasmonic Au nanoparticles (NPs) are decorated over the hybrid nanosystem of graphitic carbon nitride (GCN) and graphene quantum dots (GQD) by citrate reduction method. Surface plasmon resonance (SPR) induced enhancement of Raman G and 2D band intensity is encountered on excitation of the Plasmonic hybrid at 514.5 nm, which is near to the 532 nm absorption band of Au nanoparticles...
July 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28725402/what-does-body-size-mean-from-the-plant-s-eye-view
#5
Amanda J Tracey, Kimberly A Stephens, Brandon S Schamp, Lonnie W Aarssen
Alternative metrics exist for representing variation in plant body size, but the vast majority of previous research for herbaceous plants has focused on dry mass. Dry mass provides a reasonably accurate and easily measured estimate for comparing relative capacity to convert solar energy into stored carbon. However, from a "plant's eye view", its experience of its local biotic environment of immediate neighbors (especially when crowded) may be more accurately represented by measures of "space occupancy" (S-O) recorded in situ-rather than dry mass measured after storage in a drying oven...
October 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28723095/facile-and-low-temperature-fabrication-of-thermochromic-cr2o3-vo2-smart-coatings-enhanced-solar-modulation-ability-high-luminous-transmittance-and-uv-shielding-function
#6
Tianci Chang, Xun Cao, Ning Li, Shiwei Long, Xiang Gao, Liv R Dedon, Guangyao Sun, Hongjie Luo, Ping Jin
In the pursuit of energy efficient materials, vanadium dioxide (VO2) based smart coatings have gained much attention in recent years. For smart window applications, VO2 thin films should be fabricated at low temperature to reduce the cost in commercial fabrication and solve compatibility problems. Meanwhile, thermochromic performance with high luminous transmittance and solar modulation ability as well as effective UV shielding function has become the most important developing strategy for ideal smart windows...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722273/hydrothermal-synthesis-of-vo2-polymorphs-advantages-challenges-and-prospects-for-the-application-of-energy-efficient-smart-windows
#7
REVIEW
Ming Li, Shlomo Magdassi, Yanfeng Gao, Yi Long
Vanadium dioxide (VO2 ) is a widely studied inorganic phase change material, which has a reversible phase transition from semiconducting monoclinic to metallic rutile phase at a critical temperature of τc ≈ 68 °C. The abrupt decrease of infrared transmittance in the metallic phase makes VO2 a potential candidate for thermochromic energy efficient windows to cut down building energy consumption. However, there are three long-standing issues that hindered its application in energy efficient windows: high τc , low luminous transmittance (Tlum ), and undesirable solar modulation ability (ΔTsol )...
July 19, 2017: Small
https://www.readbyqxmd.com/read/28718472/unveiling-the-irreversible-performance-degradation-of-organo-inorganic-halide-perovskite-films-and-solar-cells-during-heating-and-cooling-processes
#8
Abdullah Al Mamun, Tanzila Tasnim Ava, Hye Ryung Byun, Hyeon Jun Jeong, Mun Seok Jeong, Loi Nguyen, Christine Gausin, Gon Namkoong
While organo-inorganic halide perovskite solar cells show great potential to meet future energy needs, their thermal instability raises serious questions about their commercialization viability. At present, the stability of perovskite solar cells has been studied under various environmental conditions including humidity and temperature. Nonetheless, understanding of the performance of CH3NH3PbI3-xClx perovskite solar cells is limited. This study reports the irreversible performance degradation of CH3NH3PbI3-xClx perovskite solar cells during the heating and cooling processes under AM 1...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718467/how-to-make-an-efficient-and-robust-molecular-catalyst-for-water-oxidation
#9
Pablo Garrido-Barros, Carolina Gimbert-Suriñach, Roc Matheu, Xavier Sala, Antoni Llobet
Energy has been a central subject for human development from Homo erectus to date. The massive use of fossil fuels during the last 50 years has generated a large CO2 concentration in the atmosphere that has led to the so-called global warming. It is very urgent to come up with C-neutral energy schemes to be able to preserve Planet Earth for future generations to come and still preserve our modern societies' life style. One of the potential solutions is water splitting with sunlight (hν-WS) that is also associated with "artificial photosynthesis", since its working mode consists of light capture followed by water oxidation and proton reduction processes...
July 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28717231/a-connection-from-stratospheric-ozone-to-el-ni%C3%A3-o-southern-oscillation
#10
Desmond Manatsa, Geoffrey Mukwada
We use reanalysis and observational data to link the lower stratospheric ozone regulation of the ultraviolet radiation (UV-B) component of solar energy to ENSO modulation. Results indicate that during ENSO extremes, the Walker Circulation (WC) and Brewer Dobson Circulation are related to lower stratospheric ozone alterations east of the date line over the Pacific. These in turn are linked to upper tropospheric anomalous dipole temperature patterns on either side of the equator. The ensuing changes in geopotential height values do not only drive equatorial zonal wind anomalies in the upper troposphere that are reversed at the equatorial surface, but also impact on the intensity of the South Pacific High circulation...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714231/a-highly-versatile-and-adaptable-artificial-leaf-with-floatability-and-planar-compact-design-applicable-in-various-natural-environments
#11
Sangkuk Kim, Taewan Kim, Seunghyup Lee, Seunghyeon Baek, Taiho Park, Kijung Yong
As a promising means of solar energy conversion, photovoltaic (PV) cell-based electrolysis has recently drawn considerable attention for its effective solar fuel generation; especially the generation of hydrogen by solar water splitting. Inspired by remarkable accomplishments in enhancing the solar-to-hydrogen conversion efficiency, various efforts have aimed at fostering convenient and practical uses of PV electrolysis to make this technology ubiquitous, manageable, and efficient. Here, the design and function of a monolithic photoelectrolysis system-a so-called artificial leaf-for use in various environments are highlighted...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714198/enhancing-performance-of-nonfullerene-acceptors-via-side-chain-conjugation-strategy
#12
Jiayu Wang, Wei Wang, Xiaohui Wang, Yang Wu, Qianqian Zhang, Cenqi Yan, Wei Ma, Wei You, Xiaowei Zhan
A side-chain conjugation strategy in the design of nonfullerene electron acceptors is proposed, with the design and synthesis of a side-chain-conjugated acceptor (ITIC2) based on a 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']di(cyclopenta-dithiophene) electron-donating core and 1,1-dicyanomethylene-3-indanone electron-withdrawing end groups. ITIC2 with the conjugated side chains exhibits an absorption peak at 714 nm, which redshifts 12 nm relative to ITIC1. The absorption extinction coefficient of ITIC2 is 2...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714078/ternary-porous-cobalt-phosphoselenide-nanosheets-an-efficient-electrocatalyst-for-electrocatalytic-and-photoelectrochemical-water-splitting
#13
Yang Hou, Ming Qiu, Tao Zhang, Xiaodong Zhuang, Chang-Soo Kim, Chris Yuan, Xinliang Feng
Exploring efficient and earth-abundant electrocatalysts is of great importance for electrocatalytic and photoelectrochemical hydrogen production. This study demonstrates a novel ternary electrocatalyst of porous cobalt phosphoselenide nanosheets prepared by a combined hydrogenation and phosphation strategy. Benefiting from the enhanced electric conductivity and large surface area, the ternary nanosheets supported on electrochemically exfoliated graphene electrodes exhibit excellent catalytic activity and durability toward hydrogen evolution in alkali, achieving current densities of 10 and 20 mA cm(-2) at overpotentials of 150 and 180 mV, respectively, outperforming those reported for transition metal dichalcogenides and first-row transition metal pyrites catalysts...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28712297/photocatalytic-conversion-of-nitrogen-to-ammonia-with-water-on-surface-oxygen-vacancies-of-titanium-dioxide
#14
Hiroaki Hirakawa, Masaki Hashimoto, Yasuhiro Shiraishi, Takayuki Hirai
Ammonia (NH3) is an essential chemical in modern society. It is currently manufactured by the Haber-Bosch process using H2 and N2 under extremely high pressure (>200 bar) and high temperature (>673 K) conditions. Photocatalytic NH3 production from water and N2 at atmospheric pressure and room temperature is ideal. Several semiconductor photocatalysts have been proposed, but all suffer from low efficiency. Here we report that a commercially-available TiO2 with a large number of surface oxygen vacancies, when photoirradiated by UV light in pure water with N2, successfully produces NH3...
July 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28710859/carbonitride-aerogels-for-the-photoredox-conversion-of-water
#15
Honghui Ou, Pengju Yang, Lihua Lin, Masakazu Anpo, Xinchen Wang
Aerogel structures have attracted increasing research interest in energy storage and conversion owing to their unique structural features, and a variety of matters has been engineered into aerogels, including carbons, metal oxides, linear polymers and even metal chalcogenides. However, manufacturing of aerogels from nitride-based materials, particularly the emerging light-weight carbonitride (CN) is rarely reported. Here, we develop a facile method based on self-assembly chemistry to produce self-supported CN aerogels, without using any cross-linking agents...
July 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28710572/tuning-the-electronic-and-optical-properties-of-ndt-based-conjugated-polymers-by-adopting-fused-heterocycles-as-acceptor-units-a-theoretical-study
#16
Na Cheng, Changqiao Zhang, Yongjun Liu
Donor-acceptor conjugated polymers have been successfully applied in bulk heterojunction solar cell devices. Tuning their donor and acceptor units allows the design of new polymers with desired electronic and optical properties. Here, to screen new candidate polymers based on a newly synthesized donor unit, dithieo[2,3-d:2',3'-d']naphtho[1,2-b:3,4-b']dithiophene (NDT), a series of model polymers with different acceptor units were designed and denoted NDT-A0 to NDT-A12, and the structures and optical properties of those polymers were investigated using DFT and TDDFT calculations...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28708387/role-of-triplet-state-shelving-in-organic-photovoltaics-single-chain-aggregates-of-poly-3-hexylthiophene-versus-mesoscopic-multichain-aggregates
#17
Florian Steiner, John M Lupton, Jan Vogelsang
Triplet excitons have been the focus of considerable attention with regards to the functioning of polymer solar cells because these species are long-lived and quench subsequently generated singlet excitons in their vicinity. The role of triplets in poly(3-hexylthiophene) (P3HT) has been investigated extensively with contrary conclusions regarding their importance. We probe the various roles triplets can play in P3HT by analyzing the photoluminescence (PL) from isolated single-chain aggregates and multichain mesoscopic aggregates...
July 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28708190/ligand-sensitized-strong-luminescence-from-eu-3-doped-liyf4-nanocrystals-a-photon-down-shifting-strategy-to-increase-solar-to-current-conversion-efficiency
#18
Tuhin Samanta, Sourav Kanti Jana, Athma E Praveen, Venkataramanan Mahalingam
Lanthanide (Ln)-doped nanocrystals generally display low luminescence quantum efficiency due to forbidden nature of the 4f-4f transition besides possessing low absorption cross sections (∼10 M(-1) cm(-1)). Considering the demand for these materials, particularly for light emission and bioimaging applications, it is very important to improve their quantum efficiency. This work demonstrates a strategy to enhance Si solar cell efficiency via sensitization of Eu(3+) ions luminescence from colloidal nanocrystals...
July 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28708117/solar-or-uva-visible-photocatalytic-ozonation-of-water-contaminants
#19
REVIEW
Fernando J Beltrán, Ana Rey
An incipient advanced oxidation process, solar photocatalytic ozonation (SPO), is reviewed in this paper with the aim of clarifying the importance of this process as a more sustainable water technology to remove priority or emerging contaminants from water. The synergism between ozonation and photocatalytic oxidation is well known to increase the oxidation rate of water contaminants, but this has mainly been studied in photocatalytic ozonation systems with lamps of different radiation wavelength, especially of ultraviolet nature (UVC, UVB, UVA)...
July 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28706230/semiconductor-based-multilayer-selective-solar-absorber-for-unconcentrated-solar-thermal-energy-conversion
#20
Nathan H Thomas, Zhen Chen, Shanhui Fan, Austin J Minnich
Solar thermal energy conversion has attracted substantial renewed interest due to its applications in industrial heating, air conditioning, and electricity generation. Achieving stagnation temperatures exceeding 200 °C, pertinent to these technologies, with unconcentrated sunlight requires spectrally selective absorbers with exceptionally low emissivity in the thermal wavelength range and high visible absorptivity for the solar spectrum. In this Communication, we report a semiconductor-based multilayer selective absorber that exploits the sharp drop in optical absorption at the bandgap energy to achieve a measured absorptance of 76% at solar wavelengths and a low emittance of approximately 5% at thermal wavelengths...
July 13, 2017: Scientific Reports
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