Effect of current density on interface structure and performance of CF/β-PbO2 electrodes during zinc electrowinning

2020 ◽  
Vol 46 (2) ◽  
pp. 2403-2408 ◽  
Author(s):  
Jianhua Liu ◽  
Fanhan Liu ◽  
Jian Xu ◽  
Zhaohui Han
Keyword(s):  
Current Density ◽  
Interface Structure ◽  
Zinc Electrowinning ◽  
And Performance ◽  
Pbo2 Electrodes

Effects of current density on preparation and performance of Al/α–PbO2–CeO2–TiO2 composites

2019 ◽  
Vol 6 (7) ◽  
pp. 075802 ◽  
Author(s):  
Runping Li ◽  
Junwen Zhou ◽  
Jianhua Liu ◽  
Buming Chen
Keyword(s):  
Current Density ◽  
And Performance

Influence of deposition rate on the properties of thick YBa2Cu3O7–δ films

1997 ◽  
Vol 12 (11) ◽  
pp. 2941-2946 ◽  
Author(s):  
S. R. Foltyn ◽  
E. J. Peterson ◽  
J. Y. Coulter ◽  
P. N. Arendt ◽  
Q. X. Jia ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Deposition Rate ◽  
Current Density ◽  
Oxygen Deficiency ◽  
Lattice Parameter ◽  
High Rate ◽  
Superconducting Transition ◽  
And Performance ◽  
Low Rate

To investigate potential limits to the rate at which high-quality YBa2Cu3O7–δ can be deposited, we have produced a series of 1 μm thick films by pulsed laser deposition on single-crystal SrTiO3 substrates at average rates ranging from 2 Å/s to 240 Å/s. The critical current density of low-rate films was over 2 MA/cm2 at 75 K, self field, but dropped linearly with rate to about 1 MA/cm2 at the upper end of the range. In addition, the superconducting transition temperature, resistivity above the transition, and performance in an applied magnetic field were all degraded by increasing the deposition rate. A change in c-axis lattice parameter suggests that possible causes for this degradation are oxygen deficiency or cation disorder with the latter being the more likely. Annealing high-rate films at 790 °C for as little as 20 min improved critical current density to within 20% of low-rate values, and resulted in dramatic improvements in other film properties as well.

scholarly journals Investigation of the stability of NiFe-(oxy)hydroxide anodes in alkaline water electrolysis under industrially relevant conditions

2020 ◽  
Vol 10 (16) ◽  
pp. 5593-5601 ◽  
Author(s):  
Marco Etzi Coller Pascuzzi ◽  
Alex J. W. Man ◽  
Andrey Goryachev ◽  
Jan P. Hofmann ◽  
Emiel J. M. Hensen
Keyword(s):  
Elevated Temperature ◽  
Current Density ◽  
Anodic Polarization ◽  
High Current Density ◽  
Water Electrolysis ◽  
High Current ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
And Performance ◽  
The Stability

Anodic polarization conducted at high current density, elevated temperature, and high KOH concentration impacted the structure and performance of NiFeOxHy and NiOxHy anodes.

Preparation of a novel Cu-Sn-Bi cathode and performance on nitrate electroreduction

2019 ◽  
Vol 79 (1) ◽  
pp. 198-206 ◽  
Author(s):  
Weichun Gao ◽  
Lulu Gao ◽  
Jing Meng ◽  
Dan Li ◽  
Yinyan Guan ◽  
...  
Keyword(s):  
Current Density ◽  
Deposition Time ◽  
Energy Dispersive Spectrometry ◽  
Linear Sweep Voltammetry ◽  
Kinetic Studies ◽  
X Ray Diffraction ◽  
Preparation Conditions ◽  
First Order Kinetics ◽  
N Removal ◽  
And Performance

Abstract Cu-Sn-Bi layer coated on Ti substrate was prepared using electrodeposition method and applied as cathode material for electrochemical reduction of nitrate in this research. Linear sweep voltammetry (LSV), chronoamperometry (CA), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) were used to scrutinize the electrochemical performance and the cathode materials. LSV results illustrated that Cu-Sn-Bi cathode possessed the ability for nitrate reduction. Preparation conditions including deposition time, current density, temperature and the content of Bi were optimized based on NO3–N removal and byproducts selectivity. Results showed that the cathode with Bi content of 3.18 at.%, and electrodepositing at current density of 6 mA cm−2, 35 °C for 30 min achieved the best performance during the experiment. The increase of Bi content could improve the electrocatalytic activity and stability of the cathode. Compared with other common researched cathodes (Cu and Fe), Cu-Sn-Bi (3.18 at.%) exhibited better performance, i.e. the highest NO3–N removal of 88.43% and the selectivity of harmless N2 was 77.80%. The kinetic studies showed that the reduction of nitrate on Cu-Sn-Bi followed pseudo-first-order kinetics.

Facile Synthesis and Performance of Reduced Graphene Oxide/Cobalt Oxide Composite for Supercapacitor

2013 ◽  
Vol 785-786 ◽  
pp. 779-782
Author(s):  
Hong Juan Wang ◽  
Dong Zhou ◽  
Feng Peng ◽  
Hao Yu
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Cobalt Oxide ◽  
Current Density ◽  
Chemical Precipitation ◽  
Discharge Performance ◽  
Reduced Graphene ◽  
Subsequent Calcination ◽  
And Performance

A series of reduced graphene oxide/cobalt oxide composites (Co3O4/rGO)were fabricated via a chemical precipitation approach and subsequent calcination in Ar atmosphere. Experimental results show that Co3O4/rGO composite with 86 wt% of Co3O4 loading exhibits the optimum specific capacitance of 240 F g-1 in 6.0 M KOH electrolyte at the current density of 0.8 A g-1, excellent quick charge-discharge performance and outstanding cyclic stability with 2.3% of its specific capacitance increase after 2400 cycles at the current density of 8 A g-1 in GCD test, exhibiting significant potential of Co3O4 /rGO composite in the application of supercapacitors.

Properties and performance of high current density Sn-core process MF Nb<inf>3</inf>Sn

1983 ◽  
Vol 19 (3) ◽  
pp. 1135-1138 ◽  
Author(s):  
R. Schwall ◽  
G. Ozeryansky ◽  
D. Hazelton ◽  
S. Cogan ◽  
R. Rose
Keyword(s):  
Current Density ◽  
High Current Density ◽  
High Current ◽  
And Performance

Composition and Performance Optimization of Catalyst Layer in a Proton Exchange Membrane Fuel Cell

1997 ◽  
Author(s):  
Curtis Marr ◽  
Xianguo Li
Keyword(s):  
Fuel Cell ◽  
Current Density ◽  
Performance Optimization ◽  
Proton Exchange Membrane ◽  
Platinum Catalyst ◽  
Catalyst Layer ◽  
Proton Exchange ◽  
Mass Transport Process ◽  
And Performance ◽  
Exchange Membrane

The composition and performance optimisation of cathode catalyst platinum and catalyst layer structure in a proton exchange membrane fuel cell has been investigated by including both electrochemical reaction and mass transport process. It is found that electrochemical reactions occur in a thin layer within a few micrometers thick, indicating ineffective catalyst utilization for the present catalyst layer design. The effective use of platinum catalyst decreases with increasing current density, hence lower loadings of platinum are feasible for higher current densities of practical interest without adverse effect on cell performance. The optimal void fraction for the catalyst layer is about 60% and fairly independent of current density, and a 40% supported platinum catalyst yields the best performance amongst various supported catalysts investigated. An optimal amount of membrane content in the void region of the catalyst layer exists for minimum cathode voltage losses due to competition between proton migration through the membrane and oxygen transfer in the void region. The present results will be useful for practical fuel cell designs.

scholarly journals The Optical and Electrical Performance of CuO Synthesized by Anodic Oxidation Based on Copper Foam

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5411
Author(s):  
Boyou Wang ◽  
Binhua Cao ◽  
Chen Wang ◽  
Yubo Zhang ◽  
Huifang Yao ◽  
...  
Keyword(s):  
Anodic Oxidation ◽  
Current Density ◽  
Oxide Semiconductor ◽  
Electrical Performance ◽  
Experimental Conditions ◽  
Electrochemical Tests ◽  
Copper Foam ◽  
Wide Range ◽  
And Performance ◽  
Cuo Nanosheets

Metal oxide semiconductor materials have a wide range of applications in the field of solar energy conversion. In this paper, CuO was prepared directly on copper foam substrate by anodic oxidation. The effects of current density and anodizing temperature on sample preparation and performance were studied. Field emission scanning electron microscopy (FESEM) and X-ray diffractometer (XRD) had been used to determine the morphology and phase structure of the sample, and its optical and electrical properties were discussed through UV-vis spectrophotometer and electrochemical tests. In addition, the influences of experimental conditions such as current density and reaction temperature on the morphology and properties of CuO were systematically discussed. The FESEM images showed that as the anodic oxidation temperature increase, the morphology of the prepared sample changed from nanowires to leaf-like CuO nanosheets. According to the results of XRD, the structure of prepared CuO was monoclinic, and the intensity of diffraction peaks gradually increased as anodizing temperature increased. We found that the optimum current density and anodizing temperature were 20 mA cm−2 and 60 °C, respectively. The results of electrochemical indicated that the CuO electrode based on copper foam (CuO/Cu foam) prepared at the optimum exhibited the highest specific capacitance (0.1039 F cm−2) when the scan rate was 2 mV s−1.

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