Related Experiment Video
Updated: Jun 20, 2026
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Dual-Confinement Strategy Enables Highly Efficient Oxygen Reduction with Fe-N5 Electrocatalysts
Shilei Li1,2, Jingshuo Liu1,2, Zhihang Liu1,2
1State Key Laboratory of Woody Oil Resources Utilization, Northeast Forestry University, Harbin 150040, PR China.
Research (Washington, D.C.)
|June 19, 2026
Summary
We developed Fe-N5 single-atom catalysts using a dual-confinement strategy for efficient oxygen reduction reactions. These catalysts show superior performance in zinc-air batteries compared to platinum.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Single-atom catalysts (SACs) offer high atom utilization efficiency.
- Optimizing the Fe-N_x microenvironment is crucial for oxygen reduction reaction (ORR) activity.
- Developing non-precious metal catalysts for energy applications is a key research area.
Purpose of the Study:
- To synthesize and characterize Fe-N5 single-atom catalysts with a unique porous architecture.
- To investigate the synergistic effects of Fe coordination, heteroatom doping, and pore structure on ORR performance.
- To evaluate the catalytic activity of the developed Fe-N5 SACs in zinc-air batteries.
Main Methods:
- A dual-confinement strategy involving wood framework and Fe3+ coordination was employed.
- Cellulose nanocrystals (CNCs) self-assembled into a porous architecture, followed by pyrolysis.
- X-ray absorption spectroscopy (XAS) and density functional theory (DFT) calculations were used for characterization and mechanistic studies.
Main Results:
- Fe-N5 single-atom catalysts were successfully anchored on N, S-codoped carbon with hierarchical pores.
- Synergistic effects from Fe-N5 coordination, S doping, and micropores optimized the catalyst's electronic structure.
- The catalysts exhibited excellent ORR activity with a half-wave potential of 0.964 V, surpassing Pt/C in zinc-air batteries.
Conclusions:
- The dual-confinement strategy effectively creates optimized Fe-N5 active sites within a porous carbon matrix.
- The developed Fe-N5 SACs demonstrate high potential as efficient and cost-effective electrocatalysts for metal-air batteries.
- This approach provides a pathway for designing advanced non-precious metal catalysts.
More Related Videos
Related Concept Videos
03:12Batteries and Fuel Cells
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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...
01:23Redox Equilibria: Overview
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
01:30Ladder Diagrams: Redox Equilibria
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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...
01:06Interfacial Electrochemical Methods: Overview
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...