scholarly journals Study of J-E Curve with Hysteresis of Carbon Nanotubes Field Emitters

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Shama Parveen ◽  
Samina Husain ◽  
Avshish Kumar ◽  
Javid Ali ◽  
Harsh ◽  
...  
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
Emission Measurement ◽  
Si Substrate ◽  
Long Term Stability ◽  
Site Density ◽  
Field Emitters ◽  
Raman Study

We observe hysteresis in J-E plot during field emission measurement of CNTs grown by LPCVD technique. CNTs are synthesized on Fe-coated Si substrate at 650°C. SEM and Raman study confirm that CNTs are successfully grown on Si substrate by LPCVD technique. In this study, we find that ramp-down curve has higher value of current density than ramp-up curve which indicates that CNTs show positive hysteresis. Our results show that a high current density at low turn-on voltage is obtained in ramp-down step of J-E plot which may be since not all CNTs contribute in ramp-up step process. But in ramp-down step all CNTs contribute as field emitters due to high electric field treatment. We also performed stability analysis of CNTs with current at constant applied voltage for 5 hrs and find that the sample shows long-term stability due to increase in emitting site density since a large number of CNTs participate in field emission.

A carbon nanotube field emission cathode with high current density and long-term stability

2009 ◽  
Vol 20 (32) ◽  
pp. 325707 ◽  
Author(s):  
Xiomara Calderón-Colón ◽  
Huaizhi Geng ◽  
Bo Gao ◽  
Lei An ◽  
Guohua Cao ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Field Emission Cathode ◽  
Term Stability ◽  
Long Term Stability ◽  
Emission Cathode

A durable VO2(M)/Zn battery with ultrahigh rate capability enabled by pseudocapacitive proton insertion

2020 ◽  
Vol 8 (4) ◽  
pp. 1731-1740 ◽  
Author(s):  
Lishang Zhang ◽  
Ling Miao ◽  
Bao Zhang ◽  
Jinsong Wang ◽  
Jia Liu ◽  
...  
Keyword(s):  
Current Density ◽  
Cathode Surface ◽  
High Current Density ◽  
Rate Capability ◽  
Electrochemical Process ◽  
High Current ◽  
Long Term Stability ◽  
Hydrate Deposition ◽  
Sulfate Hydrate

Reversible hydroxyzinc sulfate hydrate deposition/dissolution in electrochemical process could be observed on cathode surface. Good long term stability retention could also be achieved at high current density of 20 A g−1.

scholarly journals Highly CO Selective Trimetallic Metal-Organic Framework Electrocatalyst for the Electrochemical Reduction of CO2

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 537
Author(s):  
Tran-Van Phuc ◽  
Jin-Suk Chung ◽  
Seung-Hyun Hur
Keyword(s):  
High Current Density ◽  
Metal Organic Framework ◽  
Faradaic Efficiency ◽  
Onset Potential ◽  
Long Term Stability ◽  
Metal Organic ◽  
Reduction Of Co2 ◽  
Electrocatalytic Reduction Of Co2 ◽  
Organic Framework

Pd, Cu, and Zn trimetallic metal-organic framework electrocatalysts (PCZs) based on benzene-1,3,5-tricarboxylic were synthesized using a simple solvothermal synthesis. The as-synthesized PCZ catalysts exhibited as much as 95% faradaic efficiency towards CO, with a high current density, low onset potential, and excellent long-term stability during the electrocatalytic reduction of CO2.

Application of Mg-Al-LDH@MgFe2O4 Nanocomposite Supported on Gold Micron-Dendrites as an Efficient Electrocatalyst for Ethanol Oxidation

NANO ◽  
2020 ◽  
Vol 15 (03) ◽  
pp. 2050037
Author(s):  
Masoumeh Taei ◽  
Masoud Fouladgar ◽  
Foroozan Hasanpour ◽  
Fatemeh Hasheminasab
Keyword(s):  
Glassy Carbon ◽  
Current Density ◽  
Ethanol Oxidation ◽  
Carbon Electrode ◽  
Co Poisoning ◽  
Long Term Stability ◽  
Enhance Efficiency ◽  
A Current ◽  
Oxidation Of Ethanol

Mg-Al-LDH@MgFe2O4 nanocomposite was synthesized and was applied to enhance efficiency of gold micron-dendrites/glassy carbon electrode (Mg-Al-LDH@MgFe2O4/AuNDs/GCE) for oxidation of ethanol. Based on the results, Mg-Al-LDH@MgFe2O4/AuNDs showed a current density of 29.4[Formula: see text]mA cm[Formula: see text], which was 1.6 times higher than that on the surface of AuNDs/GCE. Also, long-term stability of the studied electrode showed that the nanocomposite improves CO-poisoning tolerance of the AuNDs. Accordingly, the Mg-Al-LDH@MgFe2O4/AuNDs catalyst exhibits an excellent potential for application in alkaline ethanol fuel cells.

Graphene Nanotubule Cold Field Emission Electron Sources

1994 ◽  
Vol 349 ◽  
Author(s):  
B. H. Fishbine ◽  
C. J. Miglionico ◽  
K. E. Hackett ◽  
K. J. Hendricks
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Field Emitter ◽  
Electron Sources ◽  
Field Emitter Arrays ◽  
Emission Electron ◽  
Emitter Array ◽  
Field Emitter Array

ABSTRACTBuckytubes are considered for high current density cold field emitter array electron sources. They may provide more stable, higher-brightness emission than existing cold field emitter arrays.

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