Preparation and characterization of lithium-boron alloys: electrochemical studies as anodes in molten salt media, and comparison with pure lithium-involving systems

1992 ◽  
Vol 27 (1) ◽  
pp. 240-246 ◽  
Author(s):  
P. Sanchez ◽  
C. Belin ◽  
G. Crepy ◽  
A. De Guibert
Keyword(s):  
Molten Salt ◽  
Electrochemical Studies

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

2020 ◽  
Author(s):  
Travis Marshall-Roth ◽  
Nicole J. Libretto ◽  
Alexandra T. Wrobel ◽  
Kevin Anderton ◽  
Nathan D. Ricke ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Catalytic Properties ◽  
Reduction Reaction ◽  
Iron Phthalocyanine ◽  
Electrochemical Studies ◽  
Onset Potential ◽  
Nitrogen Doped Carbon ◽  
Iron Active Sites

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, as well as iron phthalocyanine, (Pc)Fe, and iron octaethylporphyrin, (OEP)Fe, prototypical pyrrolic iron macrocycles. N 1s XPS signatures for coordinated N atoms in (phen<sub>2</sub>N<sub>2</sub>)Fe are positively shifted relative to (Pc)Fe and (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 both (Pc)Fe and (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 close to the average 1.94 Å length in Fe-N-C. Electrochemical studies establish that both (Pc)Fe and (phen<sub>2</sub>N<sub>2</sub>)Fe have relatively high Fe(III/II) potentials at ~0.6 V, ~300 mV positive of (OEP)Fe. The ORR onset potential is found to directly correlate with the Fe(III/II) potential leading to a ~300 mV positive shift in the onset of ORR for (Pc)Fe and (phen<sub>2</sub>N<sub>2</sub>)Fe relative to (OEP)Fe. Consequently, the ORR onset for (phen<sub>2</sub>N<sub>2</sub>)Fe and (Pc)Fe is within 150 mV of Fe-N-C. Unlike (OEP)Fe and (Pc)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. The aggregate spectroscopic and electrochemical data establish (phen<sub>2</sub>N<sub>2</sub>)Fe as a pyridinic iron macrocycle that effectively models Fe-N-C active sites, thereby providing a rich molecular platform for understanding this important class of catalytic materials.<p><b></b></p>

Chemical, Physical and Electrochemical Characterization of Two Stainless Steels Exposed in NaVO3 Molten Salt at 700°C

2016 ◽  
Vol 12 (6) ◽  
pp. 602-611 ◽  
Author(s):  
O. Sotelo-Mazón ◽  
Cecilia Cuevas-Arteaga ◽  
J. Porcayo-Calderón ◽  
G. Izquierdo-Montalvo
Keyword(s):  
Molten Salt ◽  
Stainless Steels ◽  
Electrochemical Characterization

Molten Salt Synthesis and Its Electrochemical Characterization of Co3O4 for Lithium Batteries

2011 ◽  
Vol 14 (5) ◽  
pp. A79 ◽  
Author(s):  
M. V. Reddy ◽  
Zhang Beichen ◽  
Li Jia’en Nicholette ◽  
Zhang Kaimeng ◽  
B. V. R. Chowdari
Keyword(s):  
Molten Salt ◽  
Lithium Batteries ◽  
Electrochemical Characterization ◽  
Molten Salt Synthesis

Synthesis and Characterization of 1‐(Carboxymethyl)Pyridinium Bromide [CMPy]Br Molten Salt: Application as a Novel Nanocatalyst for the Synthesis of Bis‐Naphthodipyrans

2018 ◽  
Vol 3 (45) ◽  
pp. 12791-12796 ◽  
Author(s):  
Mostafa Rajabi‐salek ◽  
Mohammad Ali Zolfigol ◽  
Mahmoud Zarei ◽  
Ehsan Noroozizadeh ◽  
Iraj Mohammadpoor‐Baltork ◽  
...  
Keyword(s):  
Molten Salt ◽  
Synthesis And Characterization ◽  
Pyridinium Bromide

Molten Salt Electrochemical Studies and High Energy Density Cell Development

1980 ◽  
pp. 211-222
Author(s):  
A. Bélanger ◽  
F. Morin ◽  
M. Gauthier ◽  
W. A. Adams ◽  
A. R. Dubois
Keyword(s):  
Energy Density ◽  
Molten Salt ◽  
High Energy ◽  
Cell Development ◽  
High Energy Density ◽  
Electrochemical Studies
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