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MOS Capacitor01:25

MOS Capacitor

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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Mn-modified phosphomolybdates by hydrothermal route for pseudocapacitor application.

Nusrat Tazeen Tonu1,2, Mohammad Abu Yousuf1

  • 1Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh.

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|April 8, 2026
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Summary

This study synthesized manganese-modified phosphomolybdates using a hydrothermal method. The resulting materials exhibit excellent thermal stability and promising pseudocapacitive properties for energy storage applications.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Electrochemistry

Background:

  • Organic-inorganic phosphomolybdates are advanced materials with potential applications in catalysis and energy storage.
  • Manganese (Mn) modification can tune the electrochemical properties of phosphomolybdates.
  • Hydrothermal synthesis offers a versatile route for creating complex inorganic structures.

Purpose of the Study:

  • To synthesize and characterize novel manganese-modified organic-inorganic phosphomolybdates.
  • To investigate the structural properties and thermal stability of the synthesized products.
  • To evaluate the electrochemical performance, specifically pseudocapacitive behavior, of these materials for energy storage.

Main Methods:

  • Hydrothermal synthesis was employed to prepare Mn-modified phosphomolybdates (Product-1, Product-2, Product-3).
  • X-ray Photoelectron Spectroscopy (XPS) was used to determine elemental composition and oxidation states.
  • Cyclic Voltammetry (CV) and Galvanostatic Charging-Discharging (GCD) were utilized to assess electrochemical properties.

Main Results:

  • Three distinct products were synthesized, with Product-1 being the main product and Products 2 and 3 derived from by-products.
  • All synthesized phosphomolybdates demonstrated high temperature resistance.
  • Product-3 exhibited the highest specific discharge capacitance (635.37 Fg⁻¹) at 2.0 Ag⁻¹, while Product-1 showed superior retention in GCD cycling.

Conclusions:

  • Manganese modification and synthesis conditions significantly influence the structure and electrochemical performance of phosphomolybdates.
  • The synthesized materials possess promising pseudocapacitive characteristics suitable for electrochemical energy storage.
  • Further research into optimizing Product-3 for high-performance supercapacitors is warranted.