Related Experiment Video
Updated: Jun 22, 2026
12:33
Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
Published on: February 4, 2013
21.7K
Self-Assembled Hollow Gyroids with Bicontinuous Mesostructures: A Highly Robust Electrocatalyst Fixation Platform
Gun Ho Lee1, Seongsu Choi1, HyunWoo Yang1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|November 22, 2024
Summary
Researchers developed novel hollow gyroid carbon structures for enhanced platinum catalyst stability in proton exchange membrane fuel cells (PEMFCs). These structures improve durability and performance by preventing catalyst detachment during oxygen reduction reactions (ORR).
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Electrochemical degradation of platinum on carbon (Pt/C) in proton exchange membrane fuel cells (PEMFCs) limits device durability and performance.
- Carbon corrosion is a primary cause, leading to electrocatalyst particle detachment from supports.
- Weak binding between catalyst particles and supports exacerbates degradation.
Purpose of the Study:
- To design robust hollow gyroid nanostructures for strong electrocatalyst fixation.
- To enhance surface accessibility for improved oxygen reduction reactions (ORR).
- To mitigate degradation challenges in PEMFCs.
Main Methods:
- Self-assembly of poly(styrene-b-2-vinylpyridine) (PS-b-P2VP) block copolymer into gyroid nanostructures.
- Solvent vapor treatment with dimethylformamide (DMF) for selective P2VP block interaction.
- Controlled retention of residual solvent during carbonization to form hollow gyroid carbon-Pt (HGC-Pt) structures.
Main Results:
- Hollow gyroid carbon-Pt (HGC-Pt) nanostructures were successfully synthesized.
- HGC-Pt exhibited a 3.6-fold increase in electrochemically active surface area compared to solid gyroid carbon (SGC) counterparts.
- Enhanced electrochemical stability was observed due to hollow geometry, uniform catalyst embedding, and pyridinic nitrogen doping.
Conclusions:
- The novel hollow gyroid morphology provides superior electrocatalyst fixation and accessibility.
- This approach significantly enhances the electrochemical stability and performance of Pt/C catalysts in PEMFCs.
- The findings offer a promising strategy for developing more durable and efficient fuel cell technologies.
Related Concept Videos
01:08Electrodeposition
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:28Electrochemical Cells
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
01:22Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...