scholarly journals Phase controlled synthesis of transition metal carbide nanocrystals by ultrafast flash Joule heating

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Bing Deng ◽  
Zhe Wang ◽  
Weiyin Chen ◽  
John Tianci Li ◽  
Duy Xuan Luong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Joule Heating ◽  
High Performance ◽  
Low Cost ◽  
Transition Metal Carbide ◽  
Heating Process ◽  
Metal Carbides ◽  
Carbide Phases ◽  
Molybdenum Carbides ◽  
Phase Engineering

AbstractNanoscale carbides enhance ultra-strong ceramics and show activity as high-performance catalysts. Traditional lengthy carburization methods for carbide syntheses usually result in coked surface, large particle size, and uncontrolled phase. Here, a flash Joule heating process is developed for ultrafast synthesis of carbide nanocrystals within 1 s. Various interstitial transition metal carbides (TiC, ZrC, HfC, VC, NbC, TaC, Cr2C3, MoC, and W2C) and covalent carbides (B4C and SiC) are produced using low-cost precursors. By controlling pulse voltages, phase-pure molybdenum carbides including β-Mo2C and metastable α-MoC1-x and η-MoC1-x are selectively synthesized, demonstrating the excellent phase engineering ability of the flash Joule heating by broadly tunable energy input that can exceed 3000 K coupled with kinetically controlled ultrafast cooling (>104 K s−1). Theoretical calculation reveals carbon vacancies as the driving factor for topotactic transition of carbide phases. The phase-dependent hydrogen evolution capability of molybdenum carbides is investigated with β-Mo2C showing the best performance.

scholarly journals Transition Metal Carbide Core/Shell Nanoparticles by Ultra-Short Laser Ablation in Liquid

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 145 ◽  
Author(s):  
Angela De Bonis ◽  
Mariangela Curcio ◽  
Antonio Santagata ◽  
Agostino Galasso ◽  
Roberto Teghil
Keyword(s):  
Laser Ablation ◽  
Transition Metal ◽  
Organic Solvents ◽  
Transition Metal Carbide ◽  
Metal Carbide ◽  
Laser Ablation In Liquid ◽  
Shell Nanoparticles ◽  
Synthetic Strategy ◽  
Molybdenum Carbides ◽  
Wide Range

Transition metal carbide nanoparticles are a class of technological interesting materials with a wide range of applications. Among metal carbides, tantalum carbides have good compatibility with the biological environment while molybdenum carbides are used as catalyst in electrochemical reactions. Laser ablation of bulk transition metal targets in some liquids is here reported and laser ablation in organic solvents is used as simple synthetic strategy for the production of carbide nanostructures. Herein, the nanoparticles produced by ultra-short laser ablation of tantalum and molybdenum in water, acetone, ethanol and toluene have been characterized by TEM, XRD and XPS analysis. The combined effect of metal and solvent chemical and physical properties on the composition of the nanomaterials obtained has been pointed out. In particular, the different reactivity of Ta and Mo with respect to oxidizing species determines the composition of particles obtained in water, on the other hand the organic solvents decomposition allows to obtain transition metal carbide (TMC) nanoparticles. The observed carbonaceous shell formed on TMC allows to protect the particle’s carbidic core and to improve and tailor the applications of these nanomaterials.

scholarly journals Tuning transition metal carbide activity by surface metal alloying: a case study on CO2capture and activation

2018 ◽  
Vol 20 (34) ◽  
pp. 22179-22186 ◽  
Author(s):  
Martí López ◽  
Luke Broderick ◽  
John J. Carey ◽  
Francesc Viñes ◽  
Michael Nolan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Density Functional ◽  
State Of The Art ◽  
Transition Metal Carbide ◽  
Metal Carbide ◽  
Metal Carbides ◽  
Early Transition Metal ◽  
Transition Metal Carbides ◽  
Surface Metal

The CO2capture and activation on early transition metal carbides can be fine-tuned by surface doping of similar metals as evidenced by state-of-the-art density functional simulations of the adsorption and desorption rates on suited models.

Plasmonic Transition Metal Carbide Electrodes for High-Performance InSe Photodetectors

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 8804-8810 ◽  
Author(s):  
Yajie Yang ◽  
Jaeho Jeon ◽  
Jin-Hong Park ◽  
Mun Seok Jeong ◽  
Byoung Hun Lee ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Metal Carbide

scholarly journals Joule Heating-Induced Carbon Fibers for Flexible Fiber Supercapacitor Electrodes

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5255
Author(s):  
Jin Gu Kang ◽  
Gang Wang ◽  
Sung-Kon Kim
Keyword(s):  
Carbon Nanotubes ◽  
Joule Heating ◽  
High Performance ◽  
Electrochemical Impedance ◽  
High Current Density ◽  
Low Cost ◽  
Fast Response ◽  
Extrusion Process ◽  
Composite Fiber ◽  
Flexible Fiber

Microscale fiber-based supercapacitors have become increasingly important for the needs of flexible, wearable, and lightweight portable electronics. Fiber electrodes without pre-existing cores enable a wider selection of materials and geometries than is possible through core-containing electrodes. The carbonization of fibrous precursors using an electrically driven route, different from a conventional high-temperature process, is particularly promising for achieving this structure. Here, we present a facile and low-cost process for producing high-performance microfiber supercapacitor electrodes based on carbonaceous materials without cores. Fibrous carbon nanotubes-agarose composite hydrogels, formed by an extrusion process, are converted to a composite fiber consisting of carbon nanotubes (CNTs) surrounded by an amorphous carbon (aC) matrix via Joule heating. When assembled into symmetrical two-electrode cells, the composite fiber (aC-CNTs) supercapacitor electrodes deliver a volumetric capacitance of 5.1 F cm−3 even at a high current density of 118 mA cm−3. Based on electrochemical impedance spectroscopy analysis, it is revealed that high electrochemical properties are attributed to fast response kinetics with a characteristic time constant of 2.5 s. The aC-CNTs fiber electrodes exhibit a 94% capacitance retention at 14 mA cm−3 for at least 10,000 charge-discharge cycles even when deformed (90° bend), which is essentially the same as that (96%) when not deformed. The aC-CNTs fiber electrodes also demonstrate excellent storage performance under mechanical deformation—for example, 1000 bending-straightening cycles.

scholarly journals Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage

2016 ◽  
Vol 3 (5) ◽  
pp. 689-693 ◽  
Author(s):  
Chang E. Ren ◽  
Meng-Qiang Zhao ◽  
Taron Makaryan ◽  
Joseph Halim ◽  
Muhammad Boota ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Two Dimensional ◽  
Metal Carbide ◽  
Ion Storage ◽  
Li Ion

Back Cover: Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage (ChemElectroChem 5/2016)

2016 ◽  
Vol 3 (5) ◽  
pp. 847-847 ◽  
Author(s):  
Chang E. Ren ◽  
Meng-Qiang Zhao ◽  
Taron Makaryan ◽  
Joseph Halim ◽  
Muhammad Boota ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Two Dimensional ◽  
Metal Carbide ◽  
Back Cover ◽  
Ion Storage ◽  
Li Ion

Electric and Magnetic Properties of Transition-Metal Carbide Sc3TC4 (T=Co, Ru, Os)

2016 ◽  
Vol 257 ◽  
pp. 34-37
Author(s):  
Takuto Kazama ◽  
Minoru Maeda ◽  
Kouichi Takase ◽  
Yoshiki Takano ◽  
Tadataka Watanabe
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Phase Transitions ◽  
Transition Metal ◽  
Density Wave ◽  
Transition Metal Carbide ◽  
Superconducting Transition ◽  
Metal Carbides ◽  
Low Dimensional ◽  
Successive Phase

We investigate electric and magnetic properties of quasi-one-dimensional transition-metal carbides Sc3TC4 (T = Co, Ru, and Os), and their mixed crystals Sc3(Co1-xRux)C4 and Sc3(Ru1-xOsx)C4. Sc3CoC4 exhibits successive phase transitions of charge-density-wave transition at TCDW ~ 140 K, Peierls-like structural transition at Ts ~ 70 K, and superconducting transition at Tc ~ 5 K. Sc3RuC4 and Sc3OsC4 exhibit a phase transition at T* ~ 220 K and 250 K, respectively, which should occur in the low-dimensional electronic structure. For Sc3CoC4, it is revealed by the investigation of the electric and magnetic properties of Sc3(Co1-xRux)C4 that the phase transitions at TCDW, Ts, and Tc exhibit different robustness against Ru doping. For Sc3RuC4 and Sc3OsC4, it is revealed by the investigation of the electric and magnetic properties of Sc3(Ru1-xOsx)C4 that an identical kind of phase transition occurs at T*. Additionally, the present study reveals that the phase transition at T* in Sc3RuC4 and Sc3OsC4 is inherently different from the phase transitions at TCDW, Ts, and Tc in Sc3CoC4.

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