U
Ujjal Das
Researcher at Argonne National Laboratory
Publications - 34
Citations - 1435
Ujjal Das is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Catalysis & Perovskite (structure). The author has an hindex of 13, co-authored 24 publications receiving 1197 citations. Previous affiliations of Ujjal Das include Massachusetts Institute of Technology & University of Chicago.
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Journal ArticleDOI
A nanostructured cathode architecture for low charge overpotential in lithium-oxygen batteries
Jun Lu,Yu Lei,Kah Chun Lau,Xiangyi Luo,Peng Du,Jianguo Wen,Rajeev S. Assary,Ujjal Das,Dean J. Miller,Jeffrey W. Elam,Hassan M. Albishri,D. Abd El-Hady,Yang-Kook Sun,Larry A. Curtiss,Khalil Amine,Khalil Amine +15 more
TL;DR: A cathode architecture based on nanoscale components that results in a dramatic reduction in charge overpotential to ~0.2 V is reported, which provides the basis for future development of lithium-oxygen cathode materials that can be used to improve the efficiency and to extend cycle life.
Journal ArticleDOI
Propylene hydrogenation and propane dehydrogenation by a single-site Zn2+ on silica catalyst
Neil M. Schweitzer,Bo Hu,Bo Hu,Ujjal Das,Hacksung Kim,Hacksung Kim,Jeffrey Greeley,Jeffrey Greeley,Larry A. Curtiss,Peter C. Stair,Peter C. Stair,Jeffrey T. Miller,Adam S. Hock,Adam S. Hock +13 more
TL;DR: In this paper, the authors reported the highly selective (more than 95%) dehydrogenation of propane to propylene as well as the reverse hydrogenation reaction by silica-supported single-site Zn(II) catalyst.
Journal ArticleDOI
Selective propane dehydrogenation with single-site CoII on SiO2 by a non-redox mechanism
Bo Hu,Bo Hu,Andrew “Bean” Getsoian,Neil M. Schweitzer,Neil M. Schweitzer,Ujjal Das,Hacksung Kim,Hacksung Kim,Jens Niklas,Oleg G. Poluektov,Larry A. Curtiss,Peter C. Stair,Peter C. Stair,Jeffrey T. Miller,Adam S. Hock,Adam S. Hock +15 more
TL;DR: In this article, the synthesis, characterization, and catalytic performance for gas phase propane dehydrogenation of single-site Co2+ ions supported on silica was reported.
Journal ArticleDOI
Raman Evidence for Late Stage Disproportionation in a Li–O2 Battery
Dengyun Zhai,Hsien-Hau Wang,Kah Chun Lau,Jing Gao,Paul C. Redfern,Feiyu Kang,Baohua Li,Ernesto Indacochea,Ujjal Das,Ho Hyun Sun,Ho Jin Sun,Khalil Amine,Larry A. Curtiss +12 more
TL;DR: Results from Raman spectroscopy provide evidence that a late stage disproportionation mechanism can occur during discharge and add new understanding to the complexities of possible processes occurring in Li-O2 batteries.
Journal ArticleDOI
Organometallic model complexes elucidate the active gallium species in alkane dehydrogenation catalysts based on ligand effects in Ga K-edge XANES
Andrew “Bean” Getsoian,Ujjal Das,Jeffrey Camacho-Bunquin,Guanghui Zhang,Guanghui Zhang,James R. Gallagher,Bo Hu,Bo Hu,Singfoong Cheah,Joshua A. Schaidle,Daniel A. Ruddy,Jesse E. Hensley,Theodore Krause,Larry A. Curtiss,Jeffrey T. Miller,Jeffrey T. Miller,Adam S. Hock,Adam S. Hock +17 more
TL;DR: In this paper, a series of molecular model compounds and grafted surface organometallic Ga species were synthesized and compared to those of gallium-based catalysts acquired under reducing conditions.