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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
Published on: November 5, 2015
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Sparsely Pillared Graphene Materials for High-Performance Supercapacitors: Improving Ion Transport and Storage
Harish Banda1, Sandy Périé1, Barbara Daffos2,3
1Université Grenoble Alpes, CEA, CNRS, INAC , Grenoble 38000 , France.
ACS Nano
|January 16, 2019
Summary
Pillared graphene materials prevent restacking, enhancing supercapacitor performance. These novel materials achieve significantly higher capacitances than reduced graphene oxide for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Graphene-based materials are promising for supercapacitors (SCs) due to high surface area and conductivity.
- Reduced graphene oxide (RGO) shows limited specific capacitance (100 F·g⁻¹) due to sheet restacking.
Purpose of the Study:
- To design and synthesize pillared graphene materials to prevent restacking and enhance SC performance.
- To investigate the electrochemical properties and ion transport in these novel graphene structures.
Main Methods:
- Synthesis of pillared graphene by cross-linking graphene sheets with bifunctional pillar molecules.
- Characterization using solid-state NMR and X-ray diffraction.
- Electrochemical analysis for supercapacitor performance evaluation.
Main Results:
- Synthesized materials exhibit covalently cross-linked graphene galleries, creating additional ion sorption sites.
- Optimized pillared graphene hydrogel shows doubled gravimetric capacitance (200 F·g⁻¹ vs 107 F·g⁻¹) and quadrupled volumetric capacitance (210 F·cm⁻³ vs 54 F·cm⁻³) compared to RGO.
- Efficient ion transport characteristics were maintained despite the pillared structure.
Conclusions:
- Pillared graphene materials effectively suppress restacking, leading to significantly improved supercapacitor performance.
- The straightforward synthesis offers a pathway for developing next-generation high-performance supercapacitors.
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