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571 results on '"Ting, Jyh-Ming"'

25. Electronic Structure Engineering in NiFe Sulfide via A Third Metal Doping as Efficient Bifunctional OER/ORR Electrocatalyst for Rechargeable Zinc‐Air Battery.

Author

Sari, Fitri Nur Indah, Lai, Yi‐Cheng, Huang, Yan‐Jia, Wei, Xuan‐Yu, Pourzolfaghar, Hamed, Chang, Yu‐Hao, Ghufron, Muhammad, Li, Yuan‐Yao, Su, Yen‐Hsun, Clemens, Oliver, and Ting, Jyh‐Ming

Subjects
ELECTRONIC structure, IRON-nickel alloys, LITHIUM-air batteries, STRUCTURAL engineering, X-ray photoelectron spectroscopy, METALS, COPPER
Abstract

Ti, V, Cr, Mn, Co, and Cu, have been investigated as a third dopant in NiFe sulfide for enhanced oxygen evolution reaction (OER)/oxygen reduction reaction (ORR). The effects of dopant on surface electronic structure, conductivity, and thermodynamic barrier of reaction are addressed and discussed. For the OER, X‐ray photoelectron spectroscopy analysis shows that electron transferring from the Ni to the dopants enhances the catalytic performance of the sulfide. Cu doped NiFe sulfide exhibits the best OER performance. For the ORR, density functional theory calculation indicates that Ti, V, Mn, Co, and Cu upshift the d‐band center (ɛd), while Cr downshifts the ɛd. Among the dopants, V leads to optimized electronic structure modification, giving optimized adsorption energy of *O on the Ni, the lowest rate determining step ΔG1, and the best ORR activity. By considering E10‐E1/2 together with the maximum current density of the OER and limited diffusion current density of the ORR, NiFeVS exhibits the best OER/ORR bifunctionality. The performance of NiFeVS as a cathodic catalyst has also been evaluated in a zinc air battery, demonstrating a specific capacity of 698 mAh g−1, maximum power density of 190 mW cm−2, and a superior cycle stability of 2400 cycles (400 h). [ABSTRACT FROM AUTHOR]

Published
2024
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36. Secondary‐Phase‐Induced Charge–Discharge Performance Enhancement of Co‐Free High Entropy Spinel Oxide Electrodes for Li‐Ion Batteries (Adv. Funct. Mater. 30/2023)

Author

Nguyen, Thi Xuyen, primary, Patra, Jagabandhu, additional, Tsai, Chia‐Chien, additional, Xuan, Wen‐Ye, additional, Chen, Hsin‐Yi Tiffany, additional, Dyer, Matthew S., additional, Clemens, Oliver, additional, Li, Ju, additional, Majumder, Subhasish Basu, additional, Chang, Jeng‐Kuei, additional, and Ting, Jyh‐Ming, additional

Published
2023
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48. Continuous Production of Functionalized Graphene Inks by Soft Solution Processing.

Author

Rao, Kodepelly Sanjeeva, Senthilnathan, Jaganathan, Ting, Jyh-Ming, and Yoshimura, Masahiro

Subjects
X-ray photoelectron spectra, GRAPHENE, GLOBAL Positioning System, ETHYLENE glycol, DIMETHYLFORMAMIDE, DISPERSING agents, CENTRIFUGATION
Abstract

The continuous production of high-quality, few-layer graphene nanosheets (GNSs) functionalized with nitrogen-containing groups was achieved via a two-stage reaction method. The initial stage produces few-layer GNSs by utilizing our recently developed glycine-bisulfate ionic complex-assisted electrochemical exfoliation of graphite. The second stage, developed here, uses a radical initiator and nitrogen precursor (azobisisobutyronitrile) under microwave conditions in an aqueous solution for the efficient nitrogen functionalization of the initially formed GNSs. These nitrile radical reactions have great advantages in green chemistry and soft processing. Raman spectra confirm the insertion of nitrogen functional groups into nitrogen-functionalized graphene (N-FG), whose disorder is higher than that of GNSs. X-ray photoelectron spectra confirm the insertion of edge/surface nitrogen functional groups. The insertion of nitrogen functional groups is further confirmed by the enhanced dispersibility of N-FG in dimethyl formamide, ethylene glycol, acetonitrile, and water. Indeed, after the synthesis of N-FG in solution, it is possible to disperse N-FG in these liquid dispersants just by a simple washing–centrifugation separation–dispersion sequence. Therefore, without any drying, milling, and redispersion into liquid again, we can produce N-FG ink with only solution processing. Thus, the present work demonstrates the 'continuous solution processing' of N-FG inks without complicated post-processing conditions. Furthermore, the formation mechanism of N-FG is presented. [ABSTRACT FROM AUTHOR]

Published
2023
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