Mesoporous MnCo2O4with abundant oxygen vacancy defects as high-performance oxygen reduction catalysts

2014 ◽  
Vol 2 (23) ◽  
pp. 8676-8682 ◽  
Author(s):  
Tian Yi Ma ◽  
Yao Zheng ◽  
Sheng Dai ◽  
Mietek Jaroniec ◽  
Shi Zhang Qiao
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Reduction ◽  
High Performance ◽  
Vacancy Defects ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts

High-Performance Fe-N-C Oxygen Reduction Catalysts Synthesized Via Chemical Vapor Deposition

2021 ◽  
Vol MA2021-01 (46) ◽  
pp. 1836-1836
Author(s):  
Li Jiao ◽  
Sanjeev Mukerjee ◽  
Deborah J. Myers ◽  
Frédéric Jaouen ◽  
Qingying Jia
Keyword(s):  
Chemical Vapor Deposition ◽  
Oxygen Reduction ◽  
Vapor Deposition ◽  
High Performance ◽  
Chemical Vapor ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts

Treasure Map for Nonmetallic Catalyst: Optimal Nitrogen and Fluorine Distribution of Biomass-Derived Carbon Materials for High-Performance Oxygen Reduction Catalysts

2021 ◽  
Author(s):  
Yaling Zhao ◽  
Yang Liu ◽  
Ye Chen ◽  
Xupo Liu ◽  
Xiaoge Li ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Throughput ◽  
Porous Carbon ◽  
High Performance ◽  
Carbon Materials ◽  
Reduction Reaction ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts

Heteroatom-doped porous carbon materials have shown promising prospects in the field of Zn-air batteries (ZABs) and fuel cells. However, the high-throughput preparation and instant screening of excellent oxygen reduction reaction...

scholarly journals A Pyridinic Fe-N4 Macrocycle Effectively Models the Active Sites in Fe/N-Doped Carbon Electrocatalysts

2019 ◽  
Author(s):  
Travis Marshall-Roth ◽  
Nicole J. Libretto ◽  
Alexandra T. Wrobel ◽  
Kevin Anderton ◽  
Nathan D. Ricke ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
Fold Increase ◽  
Reduction Reaction ◽  
Hydrogen Electrode ◽  
Oxygen Reduction Catalysts ◽  
Nitrogen Doped Carbon ◽  
Reduction Catalysts

Iron- and nitrogen-doped carbon (Fe-N-C) materials are leading candidates to replace platinum in fuel cells, but their active site structures are poorly understood. A leading postulate is that iron active sites in this class of materials exist in an Fe-N<sub>4</sub> pyridinic ligation environment. Yet, molecular Fe-based catalysts for the oxygen reduction reaction (ORR) generally feature pyrrolic coordination and pyridinic Fe-N<sub>4</sub> catalysts are, to the best of our knowledge, non-existent. We report the synthesis and characterization of a molecular pyridinic hexaazacyclophane macrocycle, (phen<sub>2</sub>N<sub>2</sub>)Fe, and compare its spectroscopic, electrochemical, and catalytic properties for oxygen reduction to a prototypical Fe-N-C material and iron octaethylporphyrin, (OEP)Fe, a prototypical pyrrolic iron macrocycle. N 1s XPS signatures for coordinated N atoms in (phen<sub>2</sub>N<sub>2</sub>)Fe are positively shifted relative to (OEP)Fe, and overlay with those of Fe-N-C. Likewise, spectroscopic XAS signatures of (phen<sub>2</sub>N<sub>2</sub>)Fe are distinct from those of (OEP)Fe, and are remarkably similar to those of Fe-N-C with compressed Fe–N bond lengths of 1.97 Å in (phen<sub>2</sub>N<sub>2</sub>)Fe that are similar to the average 1.94 Å length in Fe-N-C. Electrochemical data indicate that the iron center in (phen<sub>2</sub>N<sub>2</sub>)Fe is relatively electropositive, with an Fe(III)-OH/Fe(II)-OH<sub>2</sub> potential at 0.59 V vs the reversible hydrogen electrode (RHE), ~300 mV positive of (OEP)Fe. This correlates with a 300 mV positive shift in the onset of ORR catalysis for (phen<sub>2</sub>N<sub>2</sub>)Fe with a corresponding 1400-fold increase in TOF relative to (OEP)Fe. Consequently, the ORR onset for (phen<sub>2</sub>N<sub>2</sub>)Fe is within 150 mV of Fe-N-C. Unlike (OEP)Fe, (phen<sub>2</sub>N<sub>2</sub>)Fe displays excellent selectivity for 4-electron ORR with <4% maximum H<sub>2</sub>O<sub>2</sub> production, comparable to Fe-N-C materials. This study establishes a pyridinic iron macrocycle that effectively models Fe-N-C active sites and provides a rich platform for constructing high-performance Fe-based oxygen reduction catalysts.<br>

Microbe-engaged synthesis of carbon dot-decorated reduced graphene oxide as high-performance oxygen reduction catalysts

2016 ◽  
Vol 4 (19) ◽  
pp. 7222-7229 ◽  
Author(s):  
Lihua Zhou ◽  
Peng Fu ◽  
Yueqiang Wang ◽  
Lihua Sun ◽  
Yong Yuan
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Reduction Reaction ◽  
Microbial Reduction ◽  
Carbon Dot ◽  
Reduced Graphene ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts

A carbon dot-decorated reduced graphene oxide catalyst for the oxygen reduction reaction is developed via a combination of microbial reduction and hydrothermal treatment.

scholarly journals High-performance oxygen reduction catalysts in both alkaline and acidic fuel cells based on pre-treating carbon material and iron precursor

2017 ◽  
Vol 62 (23) ◽  
pp. 1602-1608 ◽  
Author(s):  
Ping Song ◽  
Heather M. Barkholtz ◽  
Ying Wang ◽  
Weilin Xu ◽  
Dijia Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Carbon Material ◽  
High Performance ◽  
Oxygen Reduction Catalysts ◽  
Iron Precursor ◽  
Reduction Catalysts
Sign in / Sign up

Export Citation Format

Share Document