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MOS Capacitor

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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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Phosphorization Engineering on Metal-Organic Frameworks for Quasi-Solid-State Asymmetry Supercapacitors.

Xijun Wei¹, Yingze Song¹, Lixian Song¹

¹State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

|December 23, 2020

Summary

Metal phosphides derived from metal-organic frameworks (MOFs) show promise for supercapacitors. Cobalt phosphide (CoP) and iron phosphide (FeP4) nanocubes were synthesized and assembled into a high-performance quasi-solid-state asymmetric supercapacitor.

Keywords:

energy density metal-organic frameworks phosphorization engineering quasi-solid-state asymmetry supercapacitors

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Published on: November 30, 2022

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Metal-organic frameworks (MOFs) are versatile precursors for synthesizing advanced electrode materials.
MOF-derived porous carbons, metal oxides, and sulfides are established for supercapacitors.
MOF-derived metal phosphides are underexplored for supercapacitor electrodes.

Purpose of the Study:

To synthesize MOF-derived cobalt phosphide (CoP) and iron phosphide (FeP4) nanocubes.
To evaluate their performance as electrode materials for supercapacitors.
To construct and test a quasi-solid-state asymmetric supercapacitor system.

Main Methods:

Two types of MOFs were used as precursors.
A two-step controllable heat treatment process was employed for synthesis.
CoP and FeP4 nanocubes were fabricated as positive and negative electrodes, respectively.
A quasi-solid-state asymmetric supercapacitor was assembled based on charge matching.

Main Results:

Specific capacitances of 345 F g-1 (FeP4) and 600 F g-1 (CoP) were achieved at 1 A g-1.
The asymmetric supercapacitor demonstrated a high energy density of 46.38 Wh kg-1 at 695 W kg-1.
A functional solar-charging power system was assembled, powering a toy fan.

Conclusions:

MOF-derived CoP and FeP4 nanocubes are effective electrode materials for supercapacitors.
The developed quasi-solid-state asymmetric supercapacitor offers excellent energy density and lifespan.
This research provides a practical approach for designing high-performance supercapacitor systems.