Atomically dispersed Fe/N/C composite was synthesized and its role in controlling the oxygen evolution reaction during Li-O(2) battery charging was studied by use of a tetra(ethylene glycol) dimethyl ether-based electrolyte. Li-O(2) cells using Fe/N/C as the cathode catalyst showed lower overpotentials than α-MnO(2)/carbon catalyst and carbon-only material. Gases evolved during the charge step contained only oxygen for Fe/N/C cathode catalyst, whereas CO(2) was also detected in the case of α-MnO(2)/C or carbon-only material; this CO(2) was presumably generated from electrolyte decomposition. Our results reiterate the catalytic effect in reducing overpotentials, which not only enhances battery efficiency but also improves its lifespan by reducing or eliminating electrolyte decomposition. The structure of the Fe/N/C catalyst was characterized by transmission electron microscopy, scanning transmission electron microscopy, inductively coupled plasma optical emission spectroscopy, and X-ray absorption spectroscopy. Iron was found to be uniformly distributed within the carbon matrix, and on average, Fe was coordinated by 3.3 ± 0.6 and 2.2 ± 0.3 low Z elements (C/N/O) at bond distances of ~1.92 and ~2.09 Å, respectively.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ja3042993 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Impact of Aerogel Modification for Fe-N-C Activity and Stability towards Oxygen Reduction Reaction in Phosphoric Acid Electrolyte.
ChemSusChem
December 2024
Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE), University of Stuttgart, Pfaffenwaldring 31, 70569, Stuttgart, Germany.
Resorcinol-formaldehyde based carbon aerogel (CA) has been tailored to meet the requirements as a Fe-N-C carbon support, aiming to provide sufficient, inexpensive cathode catalysts for high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). Therefore, different treatments of the aerogel are explored for optimal pore structure and incorporation of surface functionalities, which are crucial for Fe-N-C synthesis and electrochemical performance. Fe-N-Cs of differently modified aerogel are investigated in phosphoric acid electrolyte.
View Article and Find Full Text PDFAxial oxygen-bridged FeNO/NC produced by ultrafast Joule heating for efficient oxygen reduction reaction.
Chem Commun (Camb)
December 2024
Institute of Materials Science and Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Article Synopsis
- Researchers created a new type of catalyst called FeNO/NC using a rapid heating method, which consists of iron, nitrogen, and carbon atoms.
- The catalyst shows improved performance and durability for the oxygen reduction reaction (ORR) due to the interaction between iron-nitrogen and graphene that forms oxygen species.
- Computational analysis suggests that this catalyst effectively manages the bonding and release of oxygen-related molecules, making it a strong candidate for developing advanced single-atom electrocatalysts.
Boosting the Performance and Durability of Fe-N-C Fuel Cell Catalysts via Integrating MoC Clusters.
Small Methods
October 2024
Tianmushan Laboratory, Hangzhou, 311115, China.
Carbon-supported nitrogen-coordinated iron single-atom (Fe-N-C) catalysts have been regarded among the most promising platinum-group-metal-free catalysts for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). Nevertheless, their limited intrinsic activity and unsatisfactory stability have hindered their practical applications. Here, it is reported that the integration of MoC clusters effectively enhances the ORR activity and stability of Fe-N-C catalysts.
View Article and Find Full Text PDFEnhanced simazine degradation via peroxymonosulfate activation using hemin-doped rice husk biochar as a novel Fe/N-C catalyst.
Chemosphere
October 2024
School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea. Electronic address:
Article Synopsis
- The study presents a method using hemin-doped rice husk-derived biochar (RBC@Hemin) to effectively degrade the herbicide simazine (SIM) in aquatic environments through a process involving peroxymonosulfate (PMS).
- Under optimized conditions, the RBC@Hemin catalyst achieved over 99% degradation of SIM and showed high reusability, successfully removing pollutants from different water sources.
- The research also examined the degradation mechanisms and the toxicity of intermediate products, proposing this biomass-based catalyst as a promising solution for reducing organic pollutants in water.
Coordinately unsaturated single Fe-atoms with N vacancies and enhanced sp carbon defects in Fe-N(sp)-C structural units for suppression of cancer cell metabolism and electrochemical oxygen evolution.
Nanoscale
November 2024
Electrochemical Energy & Sensor Research Laboratory, Amity Institute of Click Chemistry Research & Studies, Amity University, Noida, India.
Installing coordinately unsaturated Fe-N-C structural units on polymer-composite-derived N-doped carbon offers highly active Fe-N sites for the electrochemical oxygen evolution reaction (OER) and reactive oxygen species (ROS) generation in tumor cells. An NHCl-driven high-temperature etching method was employed for the formation of FeSA950NC with coordinately unsaturated single Fe-atoms in an Fe-N(sp)-C structural unit together with N vacancies () and sp defects. The carbonization of Fe-phen@ZIF-8 at 800 °C for 30 min under argon, followed by grinding Fe-ZIF-8@RF-urea with NHCl at 950 °C for 2 hours, resulted in sp carbon defects and sites with coordination unsaturation in Fe-N due to NHCl decomposition to NH and HCl, which produced substantial internal stress for etching the carbon matrix.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!