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solar energy

Yannan Chen, Gangqiang Zhu, Mirabbos Hojamberdiev, Jianzhi Gao, Runliang Zhu, Chenghui Wang, Xiumei Wei, Peng Liu
Ag2O nanoparticles-loaded Bi5O7I microspheres forming a three dimensional Ag2O/Bi5O7I p-n heterojunction photocatalyst with wide-spectrum response were synthesized in this study. The results of transmission electron microscopy observations revealed that the Ag2O nanoparticles with the diameter of ca. 10-20nm were distributed on the surfaces of Bi5O7I nanosheets. The as-synthesized Ag2O/Bi5O7I exhibited an excellent wide-spectrum response to wavelengths ranging from ultraviolet (UV) to near-infrared (NIR), indicating its potential for effective utilization of solar energy...
October 7, 2017: Journal of Hazardous Materials
Hao Li, Leiming Tao, Feihong Huang, Qiang Sun, Xiaojuan Zhao, Junbo Han, Yan Shen, Mingkui Wang
Perovskite solar cells have been demonstrated as promising low-cost and highly-efficient next-generation solar cells. Enhancing VOC by minimization the interfacial recombination kinetics can further improve device performance. In this work, we for the first time reported on surface passivation of perovskite layers with chemical modified graphene oxides, which acts as efficient interlayer to reduce interfacial recombination and enhance hole extraction as well. Our modeling points out that the passivation effect mainly comes from the interaction between functional group (4-Fluorophenyl) and under-coordinated Pb ions...
October 13, 2017: ACS Applied Materials & Interfaces
Nemal S Gobalasingham, Jon E Carlé, Frederik C Krebs, Barry C Thompson, Eva Bundgaard, Martin Helgesen
Continuous flow methods are utilized in conjunction with direct arylation polymerization (DArP) for the scaled synthesis of the roll-to-roll compatible polymer, poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(4,7-di(thiophen-2-yl)-benzo[c][1,2,5]thiadiazole)] (PPDTBT). PPDTBT is based on simple, inexpensive, and scalable monomers using thienyl-flanked benzothiadiazole as the acceptor, which is the first β-unprotected substrate to be used in continuous flow via DArP, enabling critical evaluation of the suitability of this emerging synthetic method for minimizing defects and for the scaled synthesis of high-performance materials...
October 13, 2017: Macromolecular Rapid Communications
Yang Fan, Hua-Min Li, Rui-Huan Duan, Hai-Ting Lu, Jun-Tao Cao, Guo-Dong Zou, Qiang-Shan Jing
The metal-to-core charge transfer (MCCT) transition in sensitized titanium-oxo clusters is an important process for photoinduced electron injection in photovoltaic conversion. This process resembles most closely the Type II photoinjection in dye-sensitized solar cells. Herein we report the synthesis and photophysical and photoelectrochemical (PEC) properties of the phosphonate-stabilized titanium-oxo clusters containing the ferrocenecarboxylate ligands. These ferrocene-containing clusters exhibit intense visible absorption extended up to 600 nm along with low optical band gaps of ∼2...
October 13, 2017: Inorganic Chemistry
Wei Hu, Lin Lin, Ruiqi Zhang, Chao Yang, Jinlong Yang
Two-dimensional phosphorene with desirable optoelectronic properties (ideal band gap, high carrier mobility and strong visible light absorption) is a promising metal-free photocatalyst for water splitting. However, the band edge positions of the valence band maximum (VBM) and conduction band maximum (CBM) of a phosphorene are higher than the redox potentials in photocatalytic water splitting reactions. Thus phosphorene can only be used as the photocathode for hydrogen evolution reaction as a low-efficiency visible-light- driven photocatalyst for hydrogen production in solar water splitting cells...
October 13, 2017: Journal of the American Chemical Society
Xin Chen
Open-circuit photovoltage (Voc) is among critical parameters for achieving an efficient light-to-charge conversion in existing solar photovoltaic devices. Natural photosynthesis exploits light-harvesting chlorophyll (Chl) protein complexes to transfer sunlight energy efficiently. We describe the exploitation of photosynthetic fucoxanthin-chlorophyll protein (FCP) complexes for realizing photoelectrochemical cells with a high Voc. An antenna-dependent photocurrent response and a Voc up to 0.72V are observed and demonstrated in the bio-photovoltaic devices fabricated with photosynthetic FCP complexes and TiO2 nanostructures...
October 11, 2017: Chemistry, An Asian Journal
Mingwei Zhu, Yiju Li, Guang Chen, Feng Jiang, Zhi Yang, Xiaoguang Luo, Yanbin Wang, Steven D Lacey, Jiaqi Dai, Chengwei Wang, Chao Jia, Jiayu Wan, Yonggang Yao, Amy Gong, Bao Yang, Zongfu Yu, Siddhartha Das, Liangbing Hu
The solar steam process, akin to the natural water cycle, is considered to be an attractive approach to address water scarcity issues globally. However, water extraction from groundwater, for example, has not been demonstrated using these existing technologies. Additionally, there are major unaddressed challenges in extracting potable water from seawater including salt accumulation and long-term evaporation stability, which warrant further investigation. Herein, a high-performance solar steam device composed entirely of natural wood is reported...
October 10, 2017: Advanced Materials
Yen-Hung Lin, Pichaya Pattanasattayavong, Thomas D Anthopoulos
Following the unprecedented rise in photovoltaic power conversion efficiencies during the past five years, metal-halide perovskites (MHPs) have emerged as a new and highly promising class of solar-energy materials. Their extraordinary electrical and optical properties combined with the abundance of the raw materials, the simplicity of synthetic routes, and processing versatility make MHPs ideal for cost-efficient, large-volume manufacturing of a plethora of optoelectronic devices that span far beyond photovoltaics...
October 12, 2017: Advanced Materials
Mario Pagliaro, Francesco Meneguzzo
Driven by insight for which new research and education requires new institutional organisation, and drawing on two decades of research and educational efforts, we devise the profile and activities of a new bioeconomy and solar energy institute at Italy's Research Council. We further articulate the institute's activities suggesting avenues on how to deploy sound and giving more useful research, education and policy advice in these crucial fields for making tomorrow's common development sustainable. The outcomes of the study are of general interest, because the transition to a solar economy is of intrinsic global nature and the challenges involved are similar in many countries...
October 12, 2017: Chemistry: a European Journal
Kaoru Ohta, Shunrou Tokonami, Kotaro Takahashi, Yuto Tamura, Hiroko Yamada, Keisuke Tominaga
To improve the power conversion efficiency of solar cells, it is important to understand the underlying relaxation mechanisms of photogenerated charge carriers in organic semiconductors. In this work, we studied the charge carrier dynamics of diketopyrrolopyrrole-linked tetrabenzoporphyrin thin films where the diketopyrrolopyrrole unit has two n-butyl groups, abbreviated as C4-DPP-BP. We used time-resolved terahertz (THz) spectroscopy to track charge carrier dynamics with excitations at 800 nm and 400 nm. Compared with tetrabenzoporphyrin (BP), the extension of π-electron delocalization to the diketopyrrolopyrrole peripherals leads to an increase in absorption in the near-infrared region...
October 12, 2017: Journal of Physical Chemistry. B
Rafa Silva, Isabel Afán, Juan A Gil, Javier Bustamante
Global Positioning System (GPS) tags are nowadays widely used in wildlife tracking. This geolocation technique can suffer from fix loss biases due to poor satellite GPS geometry, that result in tracking data gaps leading to wrong research conclusions. In addition, new solar-powered GPS tags deployed on birds can suffer from a new "battery drain bias" currently ignored in movement ecology analyses. We use a GPS tracking dataset of bearded vultures (Gypaetus barbatus), tracked for several years with solar GPS tags, to evaluate the causes and triggers of fix and data retrieval loss biases...
2017: PloS One
Xiuwen Wang, Ying Xie, Buhe Bateer, Kai Pan, Yanqing Jiao, Ni Xiong, Song Wang, Honggang Fu
Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S, Se)4 (CZTSSe) as promising photovoltaic materials have drawn much attention because they are environmentally benign and earth abundant elements. In this work, the monodispersed, low-cost Cu2ZnSnS4 nanocrystals with small size have been controllably synthesized via a wet chemical routine. And CZTSSe could be easily prepared after selenization of CZTS. When they are employed as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs), the power conversion efficiency (PCE) has been improved from 3...
October 11, 2017: ACS Applied Materials & Interfaces
Tomohiro Higashi, Hiroyuki Kaneko, Tsutomu Minegishi, Hiroyuki Kobayashi, Miao Zhong, Yongbo Kuang, Takashi Hisatomi, Masao Katayama, Tsuyoshi Takata, Hiroshi Nishiyama, Taro Yamada, Kazunari Domen
The design of photoelectrochemical (PEC) cell structures that mitigate challenges related to mass transfer is the key to achieving efficient hydrogen production. A PEC cell based on an integrated photoelectrode incorporating (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 strips and BiVO4 strips exhibited 1.0% solar-to-hydrogen energy conversion efficiency even without stirring the electrolyte solution.
October 11, 2017: Chemical Communications: Chem Comm
Song Ling Wang, Xin Luo, Xiong Zhou, Ye Zhu, Xiao Chi, Wei Chen, Kai Wu, Zheng Liu, Su Ying Quek, Guoqin Xu
The synthesis of free-standing two-dimensional titania (2-D TiO2) with a reduced band gap presents complex chal-lenges to synthetic chemists. Here, we report a free-standing 2-D TiO2 sheet synthesized via a one-step solvothermal methodology, with a measured optical onset at ~ 1.84 eV. Using first principles calculations in combination with experiment, we propose that the as-formed 2-D TiO2 sheets are layers of the lepidocrocite TiO2 structure, but with large non-uniform strains consistent with its crumpled morphology...
October 11, 2017: Journal of the American Chemical Society
Eric Hittinger, Ines M L Azevedo
The variable and non-dispatchable nature of wind and solar generation has been driving interest in energy storage as an enabling low-carbon technology that can help spur large-scale adoption of renewables. However, prior work has shown that adding energy storage alone for energy arbitrage in electricity systems across the U.S. routinely increases system emissions. While adding wind or solar reduces electricity system emissions, the emissions effect of both renewable generation and energy storage varies by location...
October 10, 2017: Environmental Science & Technology
Tatsuki Morimoto, Osamu Ishitani
The photophysical and photochemical properties of transition metal complexes have attracted considerable attention because of their recent applications as photocatalysts in artificial photosynthesis and organic synthesis, as light emitters in electroluminescent (EL) devices, and as dyes in solar cells. The general control methods cannot be always used to obtain transition metal complexes with photochemical properties that are suitable for the above-mentioned applications. In the fields of solar energy conversion, strong metal-to-ligand charge-transfer (MLCT) absorption of redox photosensitizers and/or photocatalysts in the visible region with long wavelength is essential...
October 10, 2017: Accounts of Chemical Research
Jea Woong Jo, Younghoon Kim, Jongmin Choi, F Pelayo García de Arquer, Grant Walters, Bin Sun, Olivier Ouellette, Junghwan Kim, Andrew H Proppe, Rafael Quintero-Bermudez, James Fan, Jixian Xu, Chih Shan Tan, Oleksandr Voznyy, Edward H Sargent
The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC ) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching...
October 9, 2017: Advanced Materials
Huimin Shi, Shi Zhang, Xupeng Zhu, Yu Liu, Tao Wang, Tian Jiang, Guanhua Zhang, Huigao Duan
The {001}-faceted anatase TiO2 micro-/nanocrystals have been widely investigated for enhancing the photocatalysis and photoelectrochemical performance of TiO2 nanostructures, but their practical applications still require improved energy conversion efficiency under solar-light and enhanced cycling stability. In this work, we demonstrate the controlled growth of ultrathin {001}-faceted anatase TiO2 nanosheets on flexible carbon cloth for enhancing the cycling stability, and the solar-light photocatalytic performance of the synthesized TiO2 nanosheets can be significantly improved by decorating with vapor-phase-deposited uniformly distributed plasmonic gold nanoparticles...
October 13, 2017: ACS Applied Materials & Interfaces
Li Li, Yi Zeng, Tianjun Yu, Jinping Chen, Guoqiang Yang, Yi Li
Harvesting and converting low energy photons to higher ones through upconversion have great potential in solar energy conversion. Herein, we demonstrate a light-harvesting nanocrystal assembled by 9,10-distyrylanthracene and palladium(II) meso-tetraphenyltetrabenzoporphyrin as the acceptor and the sensitizer, respectively, in which red-to-green upconversion is achieved under incoherent excitation of low power density and the upconversion quantum yield of 0.29 ± 0.02% is obtained upon excitation with 640 nm laser of 120 mW cm¯²...
October 9, 2017: ChemSusChem
Ajay Kumar Baranwal, Hideaki Masutani, Hidetaka Sugita, Hiroyuki Kanda, Shusaku Kanaya, Naoyuki Shibayama, Yoshitaka Sanehira, Masashi Ikegami, Youhei Numata, Kouji Yamada, Tsutomu Miyasaka, Tomokazu Umeyama, Hiroshi Imahori, Seigo Ito
Research of CH3NH3PbI3 perovskite solar cells had significant attention as the candidate of new future energy. Due to the toxicity, however, lead (Pb) free photon harvesting layer should be discovered to replace the present CH3NH3PbI3 perovskite. In place of lead, we have tried antimony (Sb) and bismuth (Bi) with organic and metal monovalent cations (CH3NH3(+), Ag(+) and Cu(+)). Therefore, in this work, lead-free photo-absorber layers of (CH3NH3)3Bi2I9, (CH3NH3)3Sb2I9, (CH3NH3)3SbBiI9, Ag3BiI6, Ag3BiI3(SCN)3 and Cu3BiI6 were processed by solution deposition way to be solar cells...
2017: Nano Convergence
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