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Displaying 226 - 250 of 583

CH3NH3PbI3 perovskites: Ferroelasticity revealed

April 14, 2017
Author(s)
Evgheni Strelcov, Qingfeng Dong, Tao Li, Jungseok Chae, Yuchuan Shao, Yehao Deng, Alexei Gruveman, Jinsong Huang, Andrea Centrone
Ferrolectricity has been proposed as a plausible meachanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support to this hypothesis is still missing. Identifying and

Space-Time Approach for Disturbance Detection and Classification

March 9, 2017
Author(s)
Hamid Gharavi
A major challenge facing future grid systems is to identify the source of abnormal behaviors caused by faults or voltage instability. In this paper Phasor Measurement Units (PMUs) have been considered for detecting disturbances and degradation in the grid

Deconvoluting the Influences of 3D Structure on the Performance of Photoelectrodes for Solar-Driven Water Splitting

February 7, 2017
Author(s)
Daniel V. Esposito, Youngmin Lee, Heayoung Yoon, Paul M. Haney, Natalie Labrador, Thomas P. Moffat, A. A. Talin, Veronika A. Szalai
Abstract Three-dimensionally (3D) structured photoelectrodes offer a number of potential benefits for solar fuels production compared to conventional planar photoelectrodes, including decreased optical losses, higher surface area for catalysis, more facile

Tuning flexibility to control selectivity in soft porous crystals

January 31, 2017
Author(s)
Nathan Mahynski, Vincent K. Shen
We use flat-histogram Monte Carlo simulations to study how changing the flexibility of soft porous crystals (SPCs) affects their selective adsorption of a binary, size-asymmetric supercritical fluid. Specifically, we consider mesoporous SPCs which have

Transactive Energy Application Landscape Scenarios

December 15, 2016
Author(s)
David G. Holmberg, David Hardin, Ronald Melton, Ron Cunningham, Steve Widergren
This paper presents an analysis of the transactive energy (TE) application landscape, specifically examining the transactive process, business functions, actors in different smart grid (SG) application domains, and time scales. These process steps

MyData API Patterns: OAuth

December 8, 2016
Author(s)
Martin Burns, David A. Wollman
The My Data initiatives are part of the Administration's efforts to empower Americans with secure access to their own personal data, and to increase citizens' access to private-sector data-based applications and services. With its focus on personal data

X-ray Diffraction and Density Functional Theory Studies of R2FeCoO6 (R=Pr, Nd, Sm, Eu, Gd)

December 6, 2016
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Igor Levin, Izaak Williamson, P Ackerman, Kevin R. Talley, Khawla AlHamdan, James A. Kaduk, Lan Li
The structure and thermoelectric properties of a series of lanthanide iron cobalt oxides, R2FeCoO6 (R = Pr, Nd, Sm, Eu and Gd), have been investigated. The space group of these compounds was confirmed to be orthorhombic Pnma (No.62), Z=4. From Gd to Pr

Distributed Control and Communications for Grid Systems

December 5, 2016
Author(s)
Hamid Gharavi
A major problem of the grid system is identifying the source of abnormal behaviors. It is particularly important to identify the areas in which the grid system suffers from power deficiencies due to fault or voltage instability. Phasor Measurement Units

Circular Photogalvanic Effect in Organometal Halide Perovskite CH3NH3PbI3

November 7, 2016
Author(s)
Junwen Li, Paul M. Haney
We study the circular photogalvanic effect in the organometal halide perovskite solar cell absorber CH$_3$NH$_3$PbI$_3$. The calculated photocurrent density is about $10^{-9}$ A/W, comparable to the previously studied quantum well and bulk Rashba systems

Supramolecular Hemicage Cobalt Mediators for Efficient and Stable Dye-Sensitized Solar Cells

October 11, 2016
Author(s)
Lisa A. Fredin, Marina Freitag, Wenxing Yang, Luca D' Amario, K. Martin Karlsson, Anders Hagfeldt, Gerrit Boschloo
A new class of DSCs using the hemicage cobalt based mediator [Co(ttb)] 2+/3+ using the hexadentate ligand 5,5'',5''''-((2,4,6- triethyl highly preorganized benzene-1,3,5-triyl)tris(ethane-2,1- diyl))tri-2,2'- bipyridine (ttb) were studied. Current-voltage

Methylammonium lead iodide grain boundaries exhibit depth-dependent electrical properties

September 23, 2016
Author(s)
Gordon A. MacDonald, Mengjin Yang, Samuel Berweger, Jason Killgore, Pavel Kabos, Joeseph Berry, Kai Zhu, Frank W. DelRio
In this letter, the nanoscale through-film and lateral photoresponse and conductivity of large-grained methylammonium lead iodide thin films are studied. In perovskite solar cells (PSC), these films result in efficiencies > 17%. The top surface of the

Electrochemical intercalation of lithium ions into NbSe2 nanosheets

September 21, 2016
Author(s)
Albert Davydov, Anand V. Patel, Louisa Meshi, Emily Hitz, Liangbing Hu
Transition metal dichalcogenides (TMDCs) have been known for decades to have unique properties and recently attracted broad attention for their two-dimensional (2D) characteristics. NbSe2 is a metallic TMDC that has been studied for its charge density wave

Compressed-Liquid Densities of Three Reference Fuels for Combustion Testing

September 19, 2016
Author(s)
Stephanie L. Outcalt
Compressed-liquid densities of three aviation fuels have been measured with a vibrating-tube densimeter. The measurements were made from 270 K to 470 K, and 0.5 MPa to 45 MPa and have an overall combined uncertainty of 0.81 kg.m-3. The data from each of

X-ray Powder Diffraction Reference Patterns for Bi1-xPbxOCuSe

September 16, 2016
Author(s)
Winnie K. Wong-Ng, Yonggao Yan, James A. Kaduk, Xinfeng Tang
The structures and powder X-ray reference diffraction patterns of the ‘natural superlattice’ series Bi1-xPbxOCuSe (x=0, 0.02, 0.04, 0.06, 0.08 and 0.1) have been investigated. As the ionic radius of Pb2+ is greater than that of Bi3+, the unit cell volume
Displaying 226 - 250 of 583
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