MOF derived catalysts for electrochemical oxygen reduction

2014 ◽  
Vol 2 (34) ◽  
pp. 14064-14070 ◽  
Author(s):  
Xiaojuan Wang ◽  
Junwen Zhou ◽  
He Fu ◽  
Wei Li ◽  
Xinxin Fan ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Acid Leaching ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Electrochemical Oxygen

ZIF-67, a MOF with N-coordinated Co atoms, can assist the formation of active sites in oxygen reduction catalysts by pyrolysis and acid leaching.

Identification of active sites in nitrogen and sulfur co-doped carbon-based oxygen reduction catalysts

Carbon ◽  
2019 ◽  
Vol 147 ◽  
pp. 303-311 ◽  
Author(s):  
Jin-Cheng Li ◽  
Xueping Qin ◽  
Peng-Xiang Hou ◽  
Min Cheng ◽  
Chao Shi ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Co Doped ◽  
Carbon Based

Recent progress in active sites for non-noble metal carbon-based oxygen reduction catalysts

2017 ◽  
Vol 47 (5) ◽  
pp. 554-564
Author(s):  
Wei Xing ◽  
Junjie Ge ◽  
Ergui Luo ◽  
Meiling Xiao ◽  
Changpeng Liu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Noble Metal ◽  
Active Sites ◽  
Recent Progress ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Carbon Based

Fe3C-based oxygen reduction catalysts: synthesis, hollow spherical structures and applications in fuel cells

2015 ◽  
Vol 3 (4) ◽  
pp. 1752-1760 ◽  
Author(s):  
Yang Hu ◽  
Jens Oluf Jensen ◽  
Wei Zhang ◽  
Santiago Martin ◽  
Régis Chenitz ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Oxygen Reduction Catalysts ◽  
Spherical Structures ◽  
New Type ◽  
Reduction Catalysts

A new type of Fe3C-based ORR catalyst is reported including synthesis, tailored nanostructures, activities and active sites as well as fuel cell demonstration.

Active sites engineering of Pt/CNT oxygen reduction catalysts by atomic layer deposition

2020 ◽  
Vol 45 ◽  
pp. 59-66 ◽  
Author(s):  
Jie Gan ◽  
Jiankang Zhang ◽  
Baiyan Zhang ◽  
Wenyao Chen ◽  
Dongfang Niu ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts

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>

scholarly journals Morphology-Controlled Nitrogen-Containing Polymers as Synthetic Precursors for Electrochemical Oxygen Reduction Fe/N/C Cathode Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 324 ◽  
Author(s):  
Yuta Nabae
Keyword(s):  
Thermal Stability ◽  
Oxygen Reduction ◽  
High Thermal Stability ◽  
Effective Control ◽  
Cathode Catalysts ◽  
Precious Metal Catalysts ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Thermal Stability Of ◽  
Electrochemical Oxygen

Nitrogen-containing aromatic polymers such as polyimide are known for their high thermal stability. While they have been widely used in industry, their relevance to catalysis is still quite limited. In recent years, nitrogen-containing polymers have been explored as precursors of nitrogen-doped carbonaceous materials, which are particularly attractive as non-precious metal catalysts for oxygen reduction in fuel cells. The high thermal stability of nitrogen-containing polymers contributes to an effective control over the morphology of the resulting carbonaceous catalysts. This review article provides an overview of the recent progress on the research and development of Fe/N/C oxygen reduction catalysts prepared from morphology-controlled nitrogen-containing polymers.

Nitrogen-doped carbon nanoparticles derived from acrylonitrile plasma for electrochemical oxygen reduction

2015 ◽  
Vol 17 (9) ◽  
pp. 6227-6232 ◽  
Author(s):  
Gasidit Panomsuwan ◽  
Nagahiro Saito ◽  
Takahiro Ishizaki
Keyword(s):  
Oxygen Reduction ◽  
Carbon Nanoparticles ◽  
Single Source ◽  
Plasma Process ◽  
Nitrogen Doped ◽  
Single Source Precursor ◽  
Oxygen Reduction Catalysts ◽  
Nitrogen Doped Carbon ◽  
Reduction Catalysts ◽  
Electrochemical Oxygen

Nitrogen-doped carbon nanoparticles were synthesized via a solution plasma process, with acrylonitrile as a simple single-source precursor, for use as oxygen reduction catalysts.

Active Sites Engineering toward Superior Carbon-Based Oxygen Reduction Catalysts via Confinement Pyrolysis

Small ◽  
2018 ◽  
Vol 14 (19) ◽  
pp. 1800128 ◽  
Author(s):  
Sidi Wang ◽  
Qun He ◽  
Changda Wang ◽  
Hongliang Jiang ◽  
Chuanqiang Wu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Carbon Based
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