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Equivalent Capacitance01:19

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Color in Coordination Complexes
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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Amorphous cobalt hydroxide with superior pseudocapacitive performance.

H B Li1, M H Yu, X H Lu

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Physics & Engineering, and ‡MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University , Guangzhou 510275, Guangdong, P. R. China.

ACS Applied Materials & Interfaces
|January 7, 2014
PubMed
Summary
This summary is machine-generated.

Amorphous cobalt hydroxide (Co(OH)2) nanostructures were synthesized using green electrochemistry. These materials show high capacitance and long cycle life, making them promising for energy storage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Cobalt hydroxide (Co(OH)2) is a promising material for supercapacitor electrodes due to its electrical properties.
  • Research has predominantly focused on crystalline Co(OH)2, overlooking the potential of amorphous structures.
  • Amorphous materials can offer improved electrochemical efficiency due to their disordered structure.

Purpose of the Study:

  • To synthesize amorphous cobalt hydroxide (Co(OH)2) nanostructures.
  • To evaluate the electrochemical properties of amorphous Co(OH)2 for supercapacitor applications.
  • To compare the performance of amorphous Co(OH)2 with crystalline counterparts.

Main Methods:

  • A simple and green electrochemical synthesis method was employed.
  • The synthesized amorphous Co(OH)2 nanostructures were characterized for their electrochemical behavior.
  • Performance was tested in supercapacitor devices.

Main Results:

  • Ultrahigh capacitance of 1094 F g(-1) was achieved.
  • Excellent cycle life with 95% retention over 8000 cycles at 100 mV s(-1) was demonstrated.
  • Amorphous Co(OH)2 exhibited electrochemical performance comparable to crystalline Co(OH)2.

Conclusions:

  • Amorphous Co(OH)2 nanostructures synthesized via green electrochemistry show superior performance for supercapacitors.
  • The disordered structure of amorphous Co(OH)2 contributes to enhanced electrochemical efficiency.
  • These findings highlight the potential of amorphous nanomaterials in advanced energy storage solutions.