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Energy

Alternative energy

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Displaying 176 - 200 of 705

Dynamical evolution of the 2D/3D interface: a hidden driver behind perovskite solar cell instability

January 3, 2020
Author(s)
Lee J. Richter, Ahmad R. Kirmani, Albertus A. Sutano, Nikita Drigo, Ines G. Benito, Valentine I. Queloz, Kyung T. Cho, Pascal A. Schouwink, Mohammad K. Nazeeruddin, Giulia Grancini, Sanghyun Paek
Engineering two-/three-dimensional (2D/3D) perovskite solar cells is nowadays a popular strategy for efficient and stable devices. However, the exact function of the 2D/3D interface in controlling the long-term device behavior is still obscure. Here, we

Efficient upgrading of CO to C3 fuel using asymmetric C-C coupling active sites

November 29, 2019
Author(s)
Lee J. Richter, Ahmad R. Kirmani, Xue Wang, Wang Ziyuan, Dinh Cao-Thang, Li Jun, Nam Dae-Hyun, Li Fengwang, Huang Chun-Wei, Tan Chih-Shan, Chen Zitao, Chi Miaofang, Gabardo M. Christine, Seiifitokaldani Ali, Todorovic Petar, Proppe Andrew, Pang Yuanjie, wang yuhang, Ip H. Alexander, Shen-Chuan Lo, shana O. kelley, David Sinton, Edward H. Sargent, Tao-Tao Zhuang, Benjamin Scheffel
The electroreduction of C1 feedgas to high-energy-density fuels provides an attractive avenue to the storage of renewable electricity. Much progress has been made to improve selectivity to C1 and C2 products, however, the selectivity to desirable high

Unveiling defect-mediated charge-carrier recombination at the nanometer scale in polycrystalline solar cells

November 20, 2019
Author(s)
Yohan Yoon, Wei-Chang Yang, Dongheon Ha, Paul M. Haney, Daniel Hirsch, Heayoung Yoon, Renu Sharma, Nikolai Zhitenev
In this work, we employ two techniques, near-field scanning photocurrent microscopy (NSPM) and transmission electron microscope based cathodoluminescence spectroscopy (TEM-CL), to analyze the nanoscale electrical and optical properties of CdTe solar cells

Copper Nanocubes for CO2 Reduction in Gas Diffusion Electrodes

October 31, 2019
Author(s)
Yuxuan Wang, Hao Shen, Ken J. Livi, David Raciti, Han Zong, John Gregg, Mofopefoluwa Onadeko, Yidong Wang, Adam Watson, Chao Wang
Electroreduction of CO2 represents a promising solution for addressing the global challenges in energy and sustainability. The reaction is highly sensitive to the surface structure of electrocatalysts and the local electrochemical environment. We have

HEXRD Measurement of Strain and Dislocation Density ahead of Crack Tips Grown in Hydrogen

September 13, 2019
Author(s)
Matthew J. Connolly, May L. Martin, Peter E. Bradley, Damian S. Lauria, Andrew J. Slifka, Jun Sang Park, Robert Amaro
The deformation fields near fatigue crack tips grown in hydrogen and in air were measured using high-energy x-ray diffraction. A larger magnitude of elastic strain was observed in the hydrogen case compared to the air case. The magnitude of elastic strain

Crystal Orientation Drives the Interface Physics at 2/3-Dimensional Hybrid Perovskites

September 9, 2019
Author(s)
Lee J. Richter, Ahmad R. Kirmani, Marine E. Bouduban, Valentine I. Queloz, Valentina M. Caselli, Kyung T. Cho, Sanghyun Paek, Cristina Roldan-Carmona, Jacques E. Moser, Tom J. Savenije, Mohammad K. Nazeeruddin, Giulia Grancini
Combining halide perovskites with tailored dimensionality into two/three-dimensional (2D/3D) systems has revealed a powerful strategy to boost the performances of perovskite photovoltaics (PVs). Despite recent advances, a clear understanding of the

Engineered Sulfur-MoS2-Graphene Heterostructure Cathodes for Diagnostics of Nanoscale Electrochemical Processes in High Energy Density Li-S Batteries

August 5, 2019
Author(s)
Vladimir P. Oleshko, William R. McGehee, Saya Takeuchi, Siyuan Zhang, Andrei A. Kolmakov, Jabez J. McClelland, Christopher L. Soles
Lithium-sulfur (Li-S) batteries have recently attracted enormous attention because of high theoretical specific energy (2600 Wh kg-1) and high specific capacity (1672 mAhg-1), as well as the low cost, natural abundance, and nontoxicity of elemental sulfur