scholarly journals Synthesis of Cobalt-Nickel Nanoparticles via a Liquid-Phase Reduction Process

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
T. Usami ◽  
S. A. Salman ◽  
K. Kuroda ◽  
M. K. Gouda ◽  
A. Mahdy ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Nickel Nanoparticles ◽  
Raw Materials ◽  
Reduction Process ◽  
Electronic Configuration ◽  
Reduction Reaction ◽  
Cobalt Sulfate ◽  
Mixing Ratios ◽  
Phase Reduction ◽  
Cobalt Nickel

Cobalt-nickel nanoparticles (Co-Ni-NPs) show promising electrochemical performance in oxygen and hydrogen evolution reactions (OER and HER) due to their physicochemical properties such as electronic configuration and great electrochemical stability. Therefore, developing new economically and environmentally friendly methods of synthesizing Co-Ni-NPs has become a practical requirement. Co-Ni-NPs were produced by employing the liquid-phase reduction method. Nickel and cobalt sulfate solutions in hydrazine monohydrate with various mixing ratios were used as raw materials. Nickel plays an important role in the nucleation process via increasing the reduction reaction rate throughout the formation of Co-Ni-NPs. Furthermore, the acceleration of the Co-Ni-NPs formation process may be attributed to the partial dissolution of Ni(OH)2 in the presence of N2H4 and/or citrate-anions and the formation of the Ni-N2H4 or Ni-Cit complexes in contrast to Co(OH)2.

The Influence of Calcium Additive in the Structural Formation of Tungsten via Reduction Reaction

2015 ◽  
Vol 1088 ◽  
pp. 159-163
Author(s):  
Xin Yang ◽  
Dun Qiang Tan ◽  
Ya Lei Li ◽  
Wen He ◽  
Hong Bo Zhu ◽  
...  
Keyword(s):  
Hydrogen Reduction ◽  
Raw Materials ◽  
Tungsten Powder ◽  
Reduction Process ◽  
Reduction Reaction ◽  
Structural Formation ◽  
Powder Particles ◽  
Micro Morphology ◽  
Existing Form ◽  
Solution Doping

With the processes of solution doping and hydrogen reduction process, the raw materials APT powder was converted into the tungsten with calcium additive. Micro-morphology, micro-structure, the existing form of element calcium and their distribution were examined by SEM, HRTEM and EDS. The results show that Element calcium is mainly in the form of CaWO4in tungsten oxide powder and has two calcium tungstate forms which are CaWO4and Ca4.26W10O30in reducing tungsten powder. The Ca-W-O particles are embedding in the tungsten powder particles; the rest distribute between the tungsten powder particles.

scholarly journals Synthesis of Nano Sized Cobalt Powder from Cobalt Sulfate Heptahydrate by Liquid Phase Reduction

2011 ◽  
Vol 21 (6) ◽  
pp. 327-333 ◽  
Author(s):  
Se-Hwan An ◽  
Se-Hoon Kim ◽  
Jin-Ho Lee ◽  
Hyun-Seon Hong ◽  
Young-Do Kim
Keyword(s):  
Liquid Phase ◽  
Cobalt Powder ◽  
Cobalt Sulfate ◽  
Sulfate Heptahydrate ◽  
Phase Reduction

Synthesis of copper nanowires via a liquid phase reduction process

2017 ◽  
Vol 183 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Wu Guangming ◽  
Li Dan ◽  
Yu Jianxiang ◽  
Feng Dongdong
Keyword(s):  
Liquid Phase ◽  
Reduction Process ◽  
Copper Nanowires ◽  
Phase Reduction

scholarly journals Synthesis and Characterization of Cobalt Nanoparticles Using Hydrazine and Citric Acid

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
S. A. Salman ◽  
T. Usami ◽  
K. Kuroda ◽  
M. Okido
Keyword(s):  
Citric Acid ◽  
Reduction Method ◽  
Spherical Shape ◽  
Reduction Reaction ◽  
Cobalt Nanoparticles ◽  
Cobalt Sulfate ◽  
Hexagonal Close Packed ◽  
Phase Reduction ◽  
Large Particles

Cobalt nanoparticles were produced by employing the liquid-phase reduction method and hydrazine. The effect of citric acid additives on the formation and growth mechanism of cobalt nanoparticles was investigated using polarization methods. The cobalt nanoparticles produced in 0.2 M cobalt sulfate and 5 M hydrazine at 298 K had a spherical shape with a diameter of 400 nm. The dendritic nanoparticles formed with the decreasing of hydrazine concentration at 298 K. On the other hand, dendritic large particles are confirmed at 353 K. It was confirmed that the reduction reaction progressed with the addition of citric acid, and a hexagonal close-packed (εCo) phase was formed.

Feasibility of improving the quality of dirty manganese ores in furnaces used for the liquid-phase reduction of iron

Metallurgist ◽  
1999 ◽  
Vol 43 (11) ◽  
pp. 473-477
Author(s):  
E. F. Vegman ◽  
S. E. Lazutkin ◽  
S. S. Lazutkin
Keyword(s):  
Liquid Phase ◽  
Manganese Ores ◽  
Phase Reduction ◽  
Reduction Of Iron

Preparation of nickel–silver core–shell nanoparticles by liquid-phase reduction for use in conductive paste

2015 ◽  
Vol 10 (17) ◽  
pp. 1347-1356 ◽  
Author(s):  
Jun Jie Jing ◽  
Jimin Xie ◽  
Gao Yuan Chen ◽  
Wen Hua Li ◽  
Ming Mei Zhang
Keyword(s):  
Liquid Phase ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Nickel Silver ◽  
Phase Reduction ◽  
Core Shell Nanoparticles ◽  
Silver Core

Reduction Kinetics of Mill Scale Briquettes by Using A3 Fine Coal as a Reductant

2021 ◽  
Vol 21 (4) ◽  
pp. 2563-2567
Author(s):  
Nguyen Hoang Viet ◽  
Pham Ngoc Dieu Quynh ◽  
Nguyen Thi Hoang Oanh
Keyword(s):  
Reaction Rate ◽  
Reduction Process ◽  
Reduction Reaction ◽  
Reaction Rate Constant ◽  
Reduction Degree ◽  
Furnace Temperature ◽  
Time Duration ◽  
Mill Scale ◽  
Fine Coal ◽  
Kinetics Of

In this work, a mixture of mill scale with 5 wt% molasses as binder was pressed under pressure of 200 MPa to prepare briquettes. The reduction process was performed at the temperature of 1000, 1050, 1100, 1150 and 1200 °C in the bed of A3 fine coal as the reductant. The degree of reduction was evaluated at time duration of 15, 30, 45, 60, 90 and 150 minutes, after the furnace temperature reached the predetermined reduction temperature. The highest reduction degree is 94.7% at the reduction process temperature of 1200 °C. Reaction rate constant (k) increased from 4.63×10-4 to 5.03×10-3 min-1 when the temperature increased from 1000 to 1200 °C. The apparent activation energy of the reduction reaction (Ea) is about 95.6 kJ/mole.

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